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Flights from Ottawa to St. Louis
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Find Ottawa to St. Louis flights starting at €155.

We've found these cheap flights for you. You can book one-way or return flight tickets.

  • One way
  • Round-trip
      • YOW16:05
        16h 36m
        1 stop
        STL07:41
        Sun, Nov 24|Ottawa - St. Louis|Porter Airlines
        €155€379
        59% OFF
        59% OFF
        €379€155

        Choose Porter Airlines flights from Ottawa to St. Louis. The one-way connecting flight with Porter Airlines departs from Ottawa Macdonald-Cartier International Airport on Sun, Nov 24, arriving at St. Louis Lambert International Airport. One-way Prices start from €155 including taxes and charges.

      • YOW09:20
        15h 8m
        1 stop
        STL23:28
        Tue, Dec 17|Ottawa - St. Louis|Porter Airlines
        €157€379
        57% OFF
        57% OFF
        €379€157

        Choose Porter Airlines flights from Ottawa to St. Louis. The one-way connecting flight with Porter Airlines departs from Ottawa Macdonald-Cartier International Airport on Tue, Dec 17, arriving at St. Louis Lambert International Airport. One-way Prices start from €157 including taxes and charges.

      • YOW16:05
        16h 36m
        1 stop
        STL07:41
        Fri, Nov 22|Ottawa - St. Louis|Porter Airlines
        €168€379
        56% OFF
        56% OFF
        €379€168

        Choose Porter Airlines flights from Ottawa to St. Louis. The one-way connecting flight with Porter Airlines departs from Ottawa Macdonald-Cartier International Airport on Fri, Nov 22, arriving at St. Louis Lambert International Airport. One-way Prices start from €168 including taxes and charges.

      • YOW14:05
        7h
        1 stop
        STL20:05
        Sat, Nov 23|Ottawa - St. Louis|United Airlines
        €305
        €305

        Choose United Airlines flights from Ottawa to St. Louis. The one-way connecting flight with United Airlines departs from Ottawa Macdonald-Cartier International Airport on Sat, Nov 23, arriving at St. Louis Lambert International Airport. One-way Prices start from €305 including taxes and charges.

      • YOW06:00
        10h 19m
        1 stop
        STL15:19
        Fri, Nov 22|Ottawa - St. Louis|United Airlines
        €306
        €306

        Choose United Airlines flights from Ottawa to St. Louis. The one-way connecting flight with United Airlines departs from Ottawa Macdonald-Cartier International Airport on Fri, Nov 22, arriving at St. Louis Lambert International Airport. One-way Prices start from €306 including taxes and charges.

      • YOW14:05
        7h
        1 stop
        STL20:05
        Tue, Nov 26|Ottawa - St. Louis|United Airlines
        €308
        €308

        Choose United Airlines flights from Ottawa to St. Louis. The one-way connecting flight with United Airlines departs from Ottawa Macdonald-Cartier International Airport on Tue, Nov 26, arriving at St. Louis Lambert International Airport. One-way Prices start from €308 including taxes and charges.

      • YOW10:05
        6h 1m
        1 stop
        STL15:06
        Wed, Dec 25|Ottawa - St. Louis|Air Canada
        €309
        €309

        Choose Air Canada flights from Ottawa to St. Louis. The one-way connecting flight with Air Canada departs from Ottawa Macdonald-Cartier International Airport on Wed, Dec 25, arriving at St. Louis Lambert International Airport. One-way Prices start from €309 including taxes and charges.

      • YOW06:20
        9h 4m
        1 stop
        STL14:24
        Mon, Dec 23|Ottawa - St. Louis|United Airlines
        €313
        €313

        Choose United Airlines flights from Ottawa to St. Louis. The one-way connecting flight with United Airlines departs from Ottawa Macdonald-Cartier International Airport on Mon, Dec 23, arriving at St. Louis Lambert International Airport. One-way Prices start from €313 including taxes and charges.

      • YOW10:00
        10h 26m
        1 stop
        STL19:26
        Fri, Dec 13|Ottawa - St. Louis|Air Transat
        €314
        €314

        Choose Air Transat flights from Ottawa to St. Louis. The one-way connecting flight with Air Transat departs from Ottawa Macdonald-Cartier International Airport on Fri, Dec 13, arriving at St. Louis Lambert International Airport. One-way Prices start from €314 including taxes and charges.

      • YOW10:05
        6h 1m
        1 stop
        STL15:06
        Mon, Dec 23|Ottawa - St. Louis|Air Canada
        €318
        €318

        Choose Air Canada flights from Ottawa to St. Louis. The one-way connecting flight with Air Canada departs from Ottawa Macdonald-Cartier International Airport on Mon, Dec 23, arriving at St. Louis Lambert International Airport. One-way Prices start from €318 including taxes and charges.

      • YOW13:00
        3h 5m
        Nonstop
        STL14:00
        Fri, Nov 29|Ottawa - St. Louis|Porter Airlines
        Find More Flights
        Find More Flights

Crossed out prices are calculated based on the average price of the corresponding route on Trip.com.

When is the cheapest time to fly from Ottawa to St. Louis?

We monitor flight fares to help you find the best deals effortlessly

Displayed prices are calculated based on the cheapest average weekly prices of the corresponding route on Trip.com.

Find Cheapest Airlines Flying from Ottawa to St. Louis

Compare prices, find the option that best suits your travel needs, and enjoy a comfortable journey with a trusted airline.

Porter Airlines
From €155
WestJet
From €299
United Airlines
From €305
Air Canada
From €309
Air Transat
From €314
Delta Air Lines
From €352

Find more flights and airlines

Alternative Routes for Ottawa to St. Louis Flights

Searching for potential routes that might be cheaper and faster? Check out these alternative flights from Ottawa to St. Louis.

  • Cheapest
    Porter Airlines
    YOW
    16:05
    16h 36m
    1 transfer
    STL
    07:41
    Ottawa Macdonald-Cartier International Airport - St.Louis Lambert International Airport
    Sun, Nov 24Porter Airlines
    €155
  • Porter Airlines
    YOW
    16:05
    16h 36m
    1 transfer
    STL
    07:41
    Ottawa Macdonald-Cartier International Airport - St.Louis Lambert International Airport
    Sun, Nov 24Porter Airlines
    €155
    Find More Flights

FAQ

  • When are flight tickets from Ottawa (YOW) to St. Louis (STL) the cheapest?

    Airlines adjust prices for flights from Ottawa to St. Louis based on the date and time of your booking. By analyzing data from all airlines, on Trip.com, you can find the cheapest flight prices on Tuesdays, Wednesdays, and Saturdays.

  • How much are flights from Ottawa (YOW) to St. Louis (STL) cost?

    According to Trip.com's data, the lowest price is around €420.

  • What is the transportation method from the main airport to downtown in St. Louis?

    • The distance from St. Louis Lambert International Airport to downtown is about 20km, by taxi about 40 minutes.

  • How many airports in St. Louis (STL)?

How to find a cheap flight from Ottawa to St. Louis

Wait until the last minute and flight costs are often sky-high. Plan ahead, book the right way, and your savings can soar. We have loads of saving tips to help you find a cheap flight from Ottawa to St. Louis. Book your flights at the right time and save more.
1
Book Early
Once prices are gone, they're gone. Lock in deals while you can!
2
Compare Flight Prices
Compare prices on travel agency and airline websites.
3
Look Out for Deals
Check airline and travel agency websites for latest flight deals
4
Check One-way Fares
Buying two cheap one-way flights can sometimes be a better deal than a round-trip.
5
Try Different Dates
Flying during the week, early in the morning, or late at night can help save money.
6
Use the Trip.com App
Save up to £10 per person when booking your flights on Trip.com

Flight Information for Ottawa to St. Louis Flights

Cheapest direct flight price€155
Off-season travel monthNovember
Peak season for travelJanuary
Flight distance1,409.41km
Popular airlineUnited Airlines

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