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Seattle-Tacoma International Airport to Ontario International Airport flight
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Cheap Flight Deals from Seattle-Tacoma International Airport to Ontario International Airport

Search for flights from Seattle to Los Angeles and check out affordable one-way and round-trip options.

  • One way
  • Round-trip
      • Cheapest nonstop
        SEA16:35
        2h 39m
        Nonstop
        ONT19:14
        Seattle - Ontario|Thu, Jan 9|Frontier Airlines
        CAD 27CAD 81
        67% OFF
        67% OFF
        CAD 81CAD 27

        Choose Frontier Airlines flights from Seattle to Ontario. The one-way direct flight with Frontier Airlines departs from Seattle-Tacoma International Airport on Thu, Jan 9, arriving at Ontario International Airport. One-way Prices start from CAD 27 including taxes and charges.

      • SEA16:35
        2h 37m
        Nonstop
        ONT19:12
        Seattle - Ontario|Thu, Jan 16|Frontier Airlines
        CAD 42CAD 81
        49% OFF
        49% OFF
        CAD 81CAD 42

        Choose Frontier Airlines flights from Seattle to Ontario. The one-way direct flight with Frontier Airlines departs from Seattle-Tacoma International Airport on Thu, Jan 16, arriving at Ontario International Airport. One-way Prices start from CAD 42 including taxes and charges.

      • SEA16:35
        2h 37m
        Nonstop
        ONT19:12
        Seattle - Ontario|Thu, Jan 30|Frontier Airlines
        CAD 43CAD 81
        48% OFF
        48% OFF
        CAD 81CAD 43

        Choose Frontier Airlines flights from Seattle to Ontario. The one-way direct flight with Frontier Airlines departs from Seattle-Tacoma International Airport on Thu, Jan 30, arriving at Ontario International Airport. One-way Prices start from CAD 43 including taxes and charges.

      • SEA13:36
        2h 37m
        Nonstop
        ONT16:13
        Seattle - Ontario|Thu, Feb 20|Frontier Airlines
        CAD 47
        CAD 47

        Choose Frontier Airlines flights from Seattle to Ontario. The one-way direct flight with Frontier Airlines departs from Seattle-Tacoma International Airport on Thu, Feb 20, arriving at Ontario International Airport. One-way Prices start from CAD 47 including taxes and charges.

      • SEA19:01
        2h 38m
        Nonstop
        ONT21:39
        Seattle - Ontario|Tue, Dec 31|Frontier Airlines
        CAD 56
        CAD 56

        Choose Frontier Airlines flights from Seattle to Ontario. The one-way direct flight with Frontier Airlines departs from Seattle-Tacoma International Airport on Tue, Dec 31, arriving at Ontario International Airport. One-way Prices start from CAD 56 including taxes and charges.

      • SEA12:52
        2h 37m
        Nonstop
        ONT15:29
        Seattle - Ontario|Thu, Mar 13|Frontier Airlines
        CAD 56
        CAD 56

        Choose Frontier Airlines flights from Seattle to Ontario. The one-way direct flight with Frontier Airlines departs from Seattle-Tacoma International Airport on Thu, Mar 13, arriving at Ontario International Airport. One-way Prices start from CAD 56 including taxes and charges.

      • SEA17:40
        2h 33m
        Nonstop
        ONT20:13
        Seattle - Ontario|Tue, Jan 7|Alaska Airlines
        CAD 59
        CAD 59

        Choose Alaska Airlines flights from Seattle to Ontario. The one-way direct flight with Alaska Airlines departs from Seattle-Tacoma International Airport on Tue, Jan 7, arriving at Ontario International Airport. One-way Prices start from CAD 59 including taxes and charges.

      • SEA20:38
        2h 34m
        Nonstop
        ONT23:12
        Seattle - Ontario|Sun, Jan 12|Alaska Airlines
        CAD 59
        CAD 59

        Choose Alaska Airlines flights from Seattle to Ontario. The one-way direct flight with Alaska Airlines departs from Seattle-Tacoma International Airport on Sun, Jan 12, arriving at Ontario International Airport. One-way Prices start from CAD 59 including taxes and charges.

      • SEA20:05
        2h 34m
        Nonstop
        ONT22:39
        Seattle - Ontario|Mon, Jan 27|Alaska Airlines
        CAD 59
        CAD 59

        Choose Alaska Airlines flights from Seattle to Ontario. The one-way direct flight with Alaska Airlines departs from Seattle-Tacoma International Airport on Mon, Jan 27, arriving at Ontario International Airport. One-way Prices start from CAD 59 including taxes and charges.

      • SEA16:35
        2h 37m
        Nonstop
        ONT19:12
        Seattle - Ontario|Thu, Jan 23|Frontier Airlines
        CAD 61
        CAD 61

        Choose Frontier Airlines flights from Seattle to Ontario. The one-way direct flight with Frontier Airlines departs from Seattle-Tacoma International Airport on Thu, Jan 23, arriving at Ontario International Airport. One-way Prices start from CAD 61 including taxes and charges.

      • SEA01:00 pm
        3h 5m
        Nonstop
        ONT02:00 pm
        Seattle - Los Angeles|Wed, Jan 1|Frontier Airlines
        Find More Flights
        Find More Flights

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

Selected Airlines from Seattle-Tacoma International Airport to Ontario International Airport

See which airlines fly from Seattle to Los Angeles. Find the airline that best meets your travel needs by comparing prices and treat yourself to an enjoyable journey.

Frontier Airlines
From CAD 27
Alaska Airlines
From CAD 59
Delta Air Lines
From CAD 70
United Airlines
From CAD 143
American Airlines
From CAD 149
Southwest Airlines
From CAD 375
Hawaiian Airlines
From CAD 1,283

Find more flights and airlines

Find Cheaper Flights from Seattle to Los Angeles. Enjoy direct flights with 1 airline

Explore other flights from Seattle to Los Angeles to find the best alternative options.

  • Cheapest
    Frontier Airlines
    SEA
    13:58
    2h 42m
    Nonstop
    LAX
    16:40
    Seattle-Tacoma International Airport - Los Angeles International Airport
    Sat, Feb 1Frontier Airlines
    CAD 14
  • Frontier Airlines
    SEA
    13:58
    2h 42m
    Nonstop
    LAX
    16:40
    Seattle-Tacoma International Airport - Los Angeles International Airport
    Sat, Feb 1Frontier Airlines
    CAD 14
    Find More Flights

Seattle-Tacoma International Airport to Ontario International Airport Flights Info

Flight distance1,540.96km
Cheapest one-way ticket priceCAD 27
Cheapest return ticket priceCAD 40

FAQs for Seattle-Tacoma International Airport to Ontario International Airport Flights

  • How long does it take to fly from Seattle-Tacoma International Airport (SEA) to Ontario International Airport (ONT)?

    It takes around 2 hours 39 minutes to fly from Seattle-Tacoma International Airport (SEA) to Seattle-Tacoma International Airport(ONT).

  • How many daily flights are there from Seattle-Tacoma International Airport (SEA) to Ontario International Airport (ONT)?

    There are around 5 daily flights from Seattle-Tacoma International Airport (SEA) to Ontario International Airport (ONT).

  • When are flight tickets from Seattle-Tacoma International Airport (SEA) to Ontario International Airport (ONT) the cheapest?

    Tickets cost around CAD 117 in February, making it the cheapest month to book. Seattle-Tacoma International Airport (SEA) to Ontario International Airport (ONT) is a popular route, so don't forget to book your tickets in advance.

  • When are flight tickets from Seattle-Tacoma International Airport (SEA) to Ontario International Airport (ONT) most expensive?

    The route from Seattle-Tacoma International Airport (SEA) to Ontario International Airport (ONT) is quite popular. Without considering departure times or holidays, tickets cost around CAD 361 in December, the most expensive month to book this route.

  • What is the transportation method from the main airport to downtown in Los Angeles?

    • The distance from Los Angeles International Airport to downtown is about 19km, by taxi about 30 minutes.
    • The distance from Ontario International Airport to downtown is about 59km, by taxi about 1 hour 10 minutes.

  • What's the closest airport to Ontario International Airport (ONT)?

    The closest airport to Ontario International Airport (ONT) is Chino Airport. The distance is around 9km.

  • Which airline operates the most direct flights from Seattle-Tacoma International Airport (SEA) to Ontario International Airport (ONT)?

    Alaska Airlines is a very popular airline operating an average of 5235 flights per month.

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