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Seattle-Tacoma International Airport to St. Louis Lambert International Airport flight

Explore the cheapest one-way and round-trip flights from Seattle-Tacoma International Airport to St. Louis Lambert International Airport over the next 90 days, with one-way fares from CAD 113 and round-trip from CAD 225. Based on Trip.com's latest 7-day flight data.

    • Cheapest nonstop
      SEA 18:07
      3h 52m
      Direct
      STL 23:59
      Seattle - St. Louis | Fri, Nov 13 | Alaska Airlines
      STL 06:00
      4h 36m
      Direct
      SEA 08:36
      St. Louis - Seattle | Sat, Nov 21 | Alaska Airlines
      CAD 288 CAD 379
      24% off
      24% off
      CAD 379 CAD 288
    • SEA 05:10
      6h 54m
      1 stop
      STL 14:04
      Seattle - St. Louis | Tue, Nov 17 | American Airlines
      STL 05:00
      8h 12m
      1 stop
      SEA 11:12
      St. Louis - Seattle | Thu, Nov 19 | American Airlines
      CAD 225 CAD 379
      41% off
      41% off
      CAD 379 CAD 225
    • SEA 23:15
      8h 10m
      1 stop
      STL 09:25
      Seattle - St. Louis | Tue, Nov 17 | Delta Air Lines
      STL 17:22
      8h 35m
      1 stop
      SEA 23:57
      St. Louis - Seattle | Thu, Nov 19 | Delta Air Lines
      CAD 229 CAD 379
      40% off
      40% off
      CAD 379 CAD 229
    • SEA 16:27
      24h 47m
      1 stop
      STL 19:14
      Seattle - St. Louis | Fri, Nov 13 | Frontier Airlines
      STL 06:40
      10h 10m
      1 stop
      SEA 14:50
      St. Louis - Seattle | Sat, Nov 21 | Delta Air Lines
      CAD 250
      34% off
      CAD 379 CAD 250
    • SEA 23:50
      8h 48m
      1 stop
      STL 10:38
      Seattle - St. Louis | Fri, Nov 13 | Delta Air Lines
      STL 10:20
      10h 17m
      1 stop
      SEA 18:37
      St. Louis - Seattle | Sat, Nov 21 | Delta Air Lines
      CAD 255
      33% off
      CAD 379 CAD 255
    • SEA 12:47
      7h 12m
      1 stop
      STL 21:59
      Seattle - St. Louis | Wed, Nov 25 | American Airlines
      STL 10:21
      8h 38m
      1 stop
      SEA 16:59
      St. Louis - Seattle | Wed, Dec 2 | American Airlines
      CAD 288
      24% off
      CAD 379 CAD 288
    • SEA 23:10
      8h 39m
      1 stop
      STL 09:49
      Seattle - St. Louis | Sat, Nov 14 | Delta Air Lines
      STL 06:00
      4h 36m
      Direct
      SEA 08:36
      St. Louis - Seattle | Sat, Nov 21 | Alaska Airlines
      CAD 291
      23% off
      CAD 379 CAD 291
    • SEA 18:07
      3h 52m
      Direct
      STL 23:59
      Seattle - St. Louis | Fri, Nov 20 | Alaska Airlines
      STL 16:40
      8h 55m
      1 stop
      SEA 23:35
      St. Louis - Seattle | Mon, Nov 23 |
      CAD 294
      22% off
      CAD 379 CAD 294
    • SEA 09:50
      8h 42m
      1 stop
      STL 20:32
      Seattle - St. Louis | Sat, Dec 12 | Delta Air Lines
      STL 06:32
      10h 31m
      1 stop
      SEA 15:03
      St. Louis - Seattle | Wed, Dec 16 | Delta Air Lines
      CAD 295
      22% off
      CAD 379 CAD 295
    • SEA 13:00
      17h 25m
      1 stop
      STL 14:00
      Seattle - St. Louis | Wed, Nov 4 | Normal Airline
      STL 15:00
      6h
      Direct
      SEA 16:00
      St. Louis - Seattle | Fri, Nov 6 | Normal Airline
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    • Cheapest
      SEA 06:00
      9h 19m
      1 stop
      STL 17:19
      Seattle - St. Louis | Wed, Nov 4 | Delta Air Lines
      CAD 113 CAD 187
      40% off
      40% off
      CAD 187 CAD 113
    • SEA 06:12
      8h 41m
      1 stop
      STL 16:53
      Seattle - St. Louis | Wed, Nov 4 | American Airlines
      CAD 117 CAD 187
      37% off
      37% off
      CAD 187 CAD 117
    • SEA 10:50
      3h 50m
      Direct
      STL 16:40
      Seattle - St. Louis | Wed, Dec 9 | Alaska Airlines
      CAD 132 CAD 678
      81% off
      81% off
      CAD 678 CAD 132
    • SEA 10:50
      3h 50m
      Direct
      STL 16:40
      Seattle - St. Louis | Tue, Dec 8 | Alaska Airlines
      CAD 132
      81% off
      CAD 678 CAD 132
    • SEA 10:50
      3h 50m
      Direct
      STL 16:40
      Seattle - St. Louis | Wed, Dec 16 | Alaska Airlines
      CAD 135
      28% off
      CAD 187 CAD 135
    • SEA 18:06
      3h 53m
      Direct
      STL 23:59
      Seattle - St. Louis | Fri, Dec 4 | Alaska Airlines
      CAD 140
      79% off
      CAD 678 CAD 140
    • SEA 06:00
      6h 44m
      1 stop
      STL 14:44
      Seattle - St. Louis | Wed, Dec 16 | Delta Air Lines
      CAD 141
      25% off
      CAD 187 CAD 141
    • SEA 16:58
      15h 59m
      1 stop
      STL 10:57
      Seattle - St. Louis | Fri, Dec 18 | Frontier Airlines
      CAD 141
      25% off
      CAD 187 CAD 141
    • SEA 09:16
      3h 50m
      Direct
      STL 15:06
      Seattle - St. Louis | Fri, Dec 11 | Alaska Airlines
      CAD 143
      24% off
      CAD 187 CAD 143
    • SEA 13:00
      17h 25m
      1 stop
      STL 14:00
      Seattle - St. Louis | Wed, Nov 4 | Normal Airline
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    • Cheapest nonstop
      SEA 10:50
      3h 50m
      Direct
      STL 16:40
      Seattle - St. Louis | Wed, Dec 9 | Alaska Airlines
      CAD 132 CAD 678
      81% off
      81% off
      CAD 678 CAD 132
    • SEA 10:50
      3h 50m
      Direct
      STL 16:40
      Seattle - St. Louis | Tue, Dec 8 | Alaska Airlines
      CAD 132 CAD 678
      81% off
      81% off
      CAD 678 CAD 132
    • SEA 10:50
      3h 50m
      Direct
      STL 16:40
      Seattle - St. Louis | Wed, Dec 16 | Alaska Airlines
      CAD 135 CAD 187
      28% off
      28% off
      CAD 187 CAD 135
    • SEA 18:06
      3h 53m
      Direct
      STL 23:59
      Seattle - St. Louis | Fri, Dec 4 | Alaska Airlines
      CAD 140
      79% off
      CAD 678 CAD 140
    • SEA 09:16
      3h 50m
      Direct
      STL 15:06
      Seattle - St. Louis | Fri, Dec 11 | Alaska Airlines
      CAD 143
      24% off
      CAD 187 CAD 143
    • SEA 18:06
      3h 53m
      Direct
      STL 23:59
      Seattle - St. Louis | Fri, Dec 11 | Alaska Airlines
      CAD 188
      72% off
      CAD 678 CAD 188
    • SEA 10:50
      3h 50m
      Direct
      STL 16:40
      Seattle - St. Louis | Tue, Dec 1 | Alaska Airlines
      CAD 189
      72% off
      CAD 678 CAD 189
    • SEA 18:06
      3h 53m
      Direct
      STL 23:59
      Seattle - St. Louis | Mon, Dec 7 | Alaska Airlines
      CAD 202
      70% off
      CAD 678 CAD 202
    • SEA 18:06
      3h 53m
      Direct
      STL 23:59
      Seattle - St. Louis | Thu, Dec 10 | Alaska Airlines
      CAD 236
      65% off
      CAD 678 CAD 236
    • SEA 13:00
      17h 25m
      1 stop
      STL 14:00
      Seattle - St. Louis | Wed, Nov 4 | Normal Airline
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    • Cheapest nonstop
      SEA 10:50
      3h 50m
      Direct
      STL 16:40
      Seattle - St. Louis | Wed, Dec 9 | Alaska Airlines
      CAD 132 CAD 678
      81% off
      81% off
      CAD 678 CAD 132
    • SEA 10:50
      3h 50m
      Direct
      STL 16:40
      Seattle - St. Louis | Tue, Dec 8 | Alaska Airlines
      CAD 132 CAD 678
      81% off
      81% off
      CAD 678 CAD 132
    • SEA 18:06
      3h 53m
      Direct
      STL 23:59
      Seattle - St. Louis | Fri, Dec 4 | Alaska Airlines
      CAD 140 CAD 678
      79% off
      79% off
      CAD 678 CAD 140
    • SEA 18:06
      3h 53m
      Direct
      STL 23:59
      Seattle - St. Louis | Fri, Dec 11 | Alaska Airlines
      CAD 188
      72% off
      CAD 678 CAD 188
    • SEA 10:50
      3h 50m
      Direct
      STL 16:40
      Seattle - St. Louis | Tue, Dec 1 | Alaska Airlines
      CAD 189
      72% off
      CAD 678 CAD 189
    • SEA 18:06
      3h 53m
      Direct
      STL 23:59
      Seattle - St. Louis | Mon, Dec 7 | Alaska Airlines
      CAD 202
      70% off
      CAD 678 CAD 202
    • SEA 18:06
      3h 53m
      Direct
      STL 23:59
      Seattle - St. Louis | Thu, Dec 10 | Alaska Airlines
      CAD 236
      65% off
      CAD 678 CAD 236
    • SEA 08:22
      4h 3m
      Direct
      STL 14:25
      Seattle - St. Louis | Wed, Nov 4 | Alaska Airlines
      CAD 247
      64% off
      CAD 678 CAD 247
    • SEA 10:50
      3h 50m
      Direct
      STL 16:40
      Seattle - St. Louis | Wed, Dec 2 | Alaska Airlines
      CAD 258
      62% off
      CAD 678 CAD 258
    • SEA 13:00
      17h 25m
      1 stop
      STL 14:00
      Seattle - St. Louis | Wed, Nov 4 | Normal Airline
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    • Cheapest nonstop
      SEA 08:22
      4h 3m
      Direct
      STL 14:25
      Seattle - St. Louis | Wed, Nov 4 | Alaska Airlines
      CAD 247 CAD 678
      64% off
      64% off
      CAD 678 CAD 247
    • SEA 08:22
      4h 3m
      Direct
      STL 14:25
      Seattle - St. Louis | Mon, Nov 9 | Alaska Airlines
      CAD 296 CAD 678
      56% off
      56% off
      CAD 678 CAD 296
    • SEA 08:22
      4h 3m
      Direct
      STL 14:25
      Seattle - St. Louis | Thu, Nov 5 | Alaska Airlines
      CAD 297 CAD 678
      56% off
      56% off
      CAD 678 CAD 297
    • SEA 09:25
      3h 56m
      Direct
      STL 15:21
      Seattle - St. Louis | Sat, Nov 7 | Alaska Airlines
      CAD 336
      50% off
      CAD 678 CAD 336
    • SEA 08:22
      4h 3m
      Direct
      STL 14:25
      Seattle - St. Louis | Fri, Nov 6 | Alaska Airlines
      CAD 361
      47% off
      CAD 678 CAD 361
    • SEA 08:22
      4h 3m
      Direct
      STL 14:25
      Seattle - St. Louis | Sun, Nov 8 | Alaska Airlines
      CAD 533
      21% off
      CAD 678 CAD 533
    • SEA 08:22
      4h 3m
      Direct
      STL 14:25
      Seattle - St. Louis | Tue, Nov 3 | Alaska Airlines
      CAD 535
      21% off
      CAD 678 CAD 535
    • SEA 05:30
      6h 2m
      1 stop
      STL 13:32
      Seattle - St. Louis | Wed, Nov 4 | Delta Air Lines
      CAD 147
      78% off
      CAD 678 CAD 147
    • SEA 13:30
      5h 39m
      1 stop
      STL 21:09
      Seattle - St. Louis | Sat, Nov 7 | Delta Air Lines
      CAD 347
      49% off
      CAD 678 CAD 347
    • SEA 13:00
      17h 25m
      1 stop
      STL 14:00
      Seattle - St. Louis | Wed, Nov 4 | Normal Airline
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    • SEA 10:50
      3h 50m
      Direct
      STL 16:40
      Seattle - St. Louis | Wed, Dec 9 | Alaska Airlines
      CAD 132 CAD 678
      81% off
      81% off
      CAD 678 CAD 132
    • SEA 10:50
      3h 50m
      Direct
      STL 16:40
      Seattle - St. Louis | Tue, Dec 8 | Alaska Airlines
      CAD 132 CAD 678
      81% off
      81% off
      CAD 678 CAD 132
    • SEA 10:50
      3h 50m
      Direct
      STL 16:40
      Seattle - St. Louis | Wed, Dec 16 | Alaska Airlines
      CAD 135 CAD 187
      28% off
      28% off
      CAD 187 CAD 135
    • SEA 09:16
      3h 50m
      Direct
      STL 15:06
      Seattle - St. Louis | Fri, Dec 11 | Alaska Airlines
      CAD 143
      24% off
      CAD 187 CAD 143
    • SEA 10:50
      3h 50m
      Direct
      STL 16:40
      Seattle - St. Louis | Tue, Dec 1 | Alaska Airlines
      CAD 189
      72% off
      CAD 678 CAD 189
    • SEA 10:50
      3h 50m
      Direct
      STL 16:40
      Seattle - St. Louis | Tue, Dec 8 | American Airlines
      CAD 256
      52% off
      CAD 533 CAD 256
    • SEA 09:16
      3h 50m
      Direct
      STL 15:06
      Seattle - St. Louis | Fri, Dec 11 | American Airlines
      CAD 256
      52% off
      CAD 533 CAD 256
    • SEA 09:16
      3h 50m
      Direct
      STL 15:06
      Seattle - St. Louis | Fri, Dec 4 | American Airlines
      CAD 257
      52% off
      CAD 533 CAD 257
    • SEA 10:50
      3h 50m
      Direct
      STL 16:40
      Seattle - St. Louis | Wed, Dec 2 | Alaska Airlines
      CAD 258
      62% off
      CAD 678 CAD 258
    • SEA 13:00
      17h 25m
      1 stop
      STL 14:00
      Seattle - St. Louis | Wed, Nov 4 | Normal Airline
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Displayed flight fares from Seattle to St. Louis are based on average prices across airlines for the next 3 months, according to the latest Trip.com database.

Trip.com Price Insights: Flights from Seattle-Tacoma International Airport to St. Louis Lambert International Airport

What is the cheapest month to fly from Seattle-Tacoma International Airport to St. Louis Lambert International Airport?

The data is based on the past 12 months and shows the average one-way ticket prices from Seattle-Tacoma International Airport to St. Louis Lambert International Airport for each month in the Trip.com database.

Based on Trip.com's data from the past 12 months, the cheapest one-way flights from Seattle-Tacoma International Airport to St. Louis Lambert International Airport are usually in March, with an average price of CAD 244. It is best to avoid December, when the average price can reach CAD 541.

CAD 541
CAD 393
CAD 244
CAD 96
    Cheapest
  • CAD 386
    Nov
  • CAD 541
    Dec
  • CAD 373
    Jan
  • CAD 320
    Feb
  • CAD 244
    Mar
  • CAD 253
    Apr
  • CAD 416
    May
  • CAD 344
    Jun
  • CAD 315
    Jul
  • CAD 405
    Aug
  • CAD 289
    Sep
  • CAD 330
    Oct

What is the cheapest day of the week to fly from Seattle-Tacoma International Airport to St. Louis Lambert International Airport?

The data is based on the past 12 months and shows the average ticket prices from Seattle-Tacoma International Airport to St. Louis Lambert International Airport for each day of the week in the Trip.com database.

Based on Trip.com's data from the past 12 months, the cheapest departure day from Seattle-Tacoma International Airport to St. Louis Lambert International Airport is Tuesday, with average prices usually lower than other days. Avoid departing on Monday as prices are typically highest on that day.

CAD 494
CAD 396
CAD 298
CAD 200
  • CAD 494
    Mon
  • CAD 298
    Tue
  • CAD 321
    Wed
  • CAD 358
    Thu
  • CAD 314
    Fri
  • CAD 490
    Sat
  • CAD 319
    Sun

Which airline offers the cheapest flights from Seattle-Tacoma International Airport to St. Louis Lambert International Airport?

The cheapest airline flying from Seattle-Tacoma International Airport to St. Louis Lambert International Airport is Delta Air Lines (from CAD 113) among 6 carriers operating this route. Based on Trip.com's latest 7-day flight data.

Delta Air Lines
From CAD 113
American Airlines
From CAD 117
Alaska Airlines
From CAD 135
Frontier Airlines
From CAD 141
Hahn Air
From CAD 187
United Airlines
From CAD 212

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What is the flight schedule from Seattle-Tacoma International Airport to St. Louis Lambert International Airport?

Check the schedule for flights from Seattle to St. Louis and find the flight that best matches your travel plans.

Flight info.
Departure
Arrival
Weekly Schedule

  1. AS314

    Seattle-Tacoma International Airport

    08:22

    SEA

    4h 3m

    14:25

    STL

    S M T W T F S
    Search

  2. DL949

    Seattle-Tacoma International Airport

    18:00

    SEA

    3h 21m

    Direct

    23:21

    MSP

    S - - - - - S
    Search

  3. DL1609

    Minneapolis-Saint Paul International Airport

    21:45

    MSP

    1h 33m

    Direct

    23:18

    STL

    S - - - - - -

  4. DL1128

    Seattle-Tacoma International Airport

    05:45

    SEA

    2h 6m

    Direct

    08:51

    SLC

    S M T W T F S
    Search

  5. DL2455

    Salt Lake City International Airport

    09:30

    SLC

    2h 53m

    Direct

    13:23

    STL

    S M T W T F S

  6. DL536

    Seattle-Tacoma International Airport

    08:25

    SEA

    3h 23m

    Direct

    13:48

    MSP

    S M T W T F S
    Search

  7. DL1839

    Minneapolis-Saint Paul International Airport

    15:03

    MSP

    1h 31m

    Direct

    16:34

    STL

    S - - - - - -

  8. DL943

    Seattle-Tacoma International Airport

    06:05

    SEA

    3h 27m

    Direct

    11:32

    MSP

    S M T W T F S
    Search

  9. DL5165

    Minneapolis-Saint Paul International Airport

    12:52

    MSP

    1h 39m

    Direct

    14:31

    STL

    S - - - - - -

  10. AA717

    Seattle-Tacoma International Airport

    14:07

    SEA

    4h 1m

    Direct

    20:08

    DFW

    S M T W T F S
    Search

  11. AA1010

    Dallas Fort Worth International Airport

    20:09

    DFW

    1h 50m

    Direct

    21:59

    STL

    S M T W T F S

  12. DL810

    Seattle-Tacoma International Airport

    23:05

    SEA

    4h 21m

    Direct

    06:26

    DTW

    S M T W T F S
    Search

  13. DL2868

    Detroit Metropolitan Wayne County Airport

    09:10

    DTW

    1h 39m

    Direct

    09:49

    STL

    S M T W T F S

  14. DL943

    Seattle-Tacoma International Airport

    06:05

    SEA

    3h 27m

    Direct

    11:32

    MSP

    S M T W T F S
    Search

  15. DL1839

    Minneapolis-Saint Paul International Airport

    15:03

    MSP

    1h 31m

    Direct

    16:34

    STL

    S - - - - - -

  16. DL812

    Seattle-Tacoma International Airport

    06:00

    SEA

    4h 15m

    Direct

    13:15

    DTW

    S M T W T F S
    Search

  17. DL2822

    Detroit Metropolitan Wayne County Airport

    16:10

    DTW

    1h 40m

    Direct

    16:50

    STL

    S - - - - - S
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About Seattle-Tacoma International Airport and St. Louis Lambert International Airport

Learn about Seattle-Tacoma International Airport (SEA) and St. Louis Lambert International Airport (STL) — including location, terminals, transportation, and travel tips.

Flight distance 2,747.47km
Cheapest one-way ticket price CAD 113
Cheapest return ticket price CAD 225

FAQs for Seattle-Tacoma International Airport to St. Louis Lambert International Airport Flights

  • How long is the flight from Seattle-Tacoma International Airport to St. Louis Lambert International Airport?

    Seattle-Tacoma International Airport to St. Louis Lambert International Airport takes about 3 hours 27 minutes on average. Actual flight time may vary depending on route, weather and air traffic.
  • There are around 2 daily flights from Seattle-Tacoma International Airport (SEA) to St. Louis Lambert International Airport (STL).
  • The earliest flight from Seattle-Tacoma International Airport to St. Louis Lambert International Airport departs at 09:40, and the last departs at 18:03, with about 2 flights per day. Flight times may change, so please check the latest departure and arrival times before you travel.
  • The route from Seattle-Tacoma International Airport (SEA) to St. Louis Lambert International Airport (STL) is quite popular. Without considering departure times or holidays, tickets cost around CAD 426 in December, the most expensive month to book this route.
    • The distance from St. Louis Lambert International Airport to downtown is about 20km, by taxi about 40 minutes.
  • American Airlines is a very popular airline operating an average of 693 flights per month.
  • One-way flights from Seattle-Tacoma International Airport to St. Louis Lambert International Airport currently start from CAD 113, and round-trip fares start from CAD 225. The current lowest fare is a Delta Air Lines flight departing on Wed, Nov 4; prices may vary depending on availability.
  • Yes. Alaska Airlines operate direct flights from Seattle-Tacoma International Airport to St. Louis Lambert International Airport, with an average flight time of 3 hours 23 minutes, and around 14 weekly flights. Actual flight frequency may vary by season.
  • Based on Trip.com flight data for departures within the next 30 days with at most one stop, the average one-way price from Seattle-Tacoma International Airport to St. Louis Lambert International Airport is CAD 305. Prices may vary depending on the departure date, airline, and availability.
  • Seattle-Tacoma International Airport to St. Louis Lambert International Airport operates around 14 weekly flights, mainly by Alaska Airlines. Actual frequency may vary during holidays and seasonal schedule adjustments.
  • Enter Seattle-Tacoma International Airport and St. Louis Lambert International Airport, select your departure date and number of passengers, then compare flights by price, flight duration, and baggage allowance. Once you've chosen a fare, review the change and refund rules, fill in passenger details, and pay to receive your booking confirmation.

Find Cheap Flights with Trip.com

Note: Prices shown on this page are estimated lowest price and include all taxes and fees found in the last 24 hours.

Book with no extra fees

Prices displayed on this page are all-inclusive prices (incl. taxes, fuel surcharge, civil aviation development fund, etc) with all fees confirmed before payment. Fees for luggage, meals, Wi-Fi, or other additional services are also included as shown in the flight cards.

Real-time pricing updates

Prices, availability, and travel information on this page were updated within the last 24 hours—even in real-time. The more popular the route, the more precise the data.

Change & Cancellation Policy

Trip.com displays flight cancellation and change policies for each flight ticket during the booking process, including fees and applicable conditions. Please check the following scenarios:
Voluntary cancellation/change:
To submit a change or cancellation request, go to the flight bookings page, select the option to change or cancel your booking, choose the relevant passengers and segment, and submit a request. Please note that additional charges may apply according to the airline ticket policy.
Cancellation/change due to a flight schedule change:
If the flight has been rescheduled and you would like to change or cancel your ticket, you can submit an involuntary cancellation request. For more details about change and cancellation policies, please check the customer support pages.