Cheap flights from Seattle, WA to Ontario, CA

Flights starting at £34. Choose between Alaska Airlines, Frontier Airlines, or United Airlines to find the best price.

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Travelers usually depart from Seattle–Tacoma International, or Kenmore Air Harbor Seaplane Base when they travel from Seattle to Ontario. The distance between Seattle and Ontario is 1542 km. The most popular airlines for this route are Alaska Airlines, Frontier Airlines, and United Airlines. Seattle and Ontario have 44 direct flights per week.

Weekly direct flights

Discover the top airlines offering direct flights from Seattle to Ontario in the next month. You’ll find the number of daily direct flights per airline in the table.

Weekly direct flights for Mon 10.06 - Sun 16.06

AirlineMon 10.06Tue 11.06Wed 12.06Thu 13.06Fri 14.06Sat 15.06Sun 16.06
4444444
1111111

Weekly direct flights for Mon 17.06 - Sun 23.06

AirlineMon 17.06Tue 18.06Wed 19.06Thu 20.06Fri 21.06Sat 22.06Sun 23.06
4444444
1111111

Weekly direct flights for Mon 24.06 - Sun 30.06

AirlineMon 24.06Tue 25.06Wed 26.06Thu 27.06Fri 28.06Sat 29.06Sun 30.06
4444444
1111111

Weekly direct flights for Mon 01.07 - Sun 07.07

AirlineMon 01.07Tue 02.07Wed 03.07Thu 04.07Fri 05.07Sat 06.07Sun 07.07
4444444
1111111

Check-in for a flight from Seattle to Ontario

NameCarrier codeIATA CodePassport needed during bookingOnline check-in available
Alaska AirlinesASAASNoOpens 24 days before flight
Closes 1 hours before flight
Frontier AirlinesFFTF9NoOpens 24 days before flight
Closes 1 hours before flight
United AirlinesUALUAYesNo

Ontario travel tips

1) Try the best spaghetti in Ontario at Vince's Spaghetti
2) Check out wines around Ontario
3) Experience camping in Ontario's landscapes

Weather in Ontario

Average Weather

MonthAverage monthly max temperatureAverage monthly min temperature
January18°C7°C
February18°C7°C
March20°C8°C
April23°C10°C
May25°C12°C
June29°C16°C
July33°C19°C
August33°C20°C
September32°C18°C
October27°C15°C
November22°C10°C
December17°C7°C
Hottest Month
33°C
August
Coldest month
7°C
February
Sunny days
340
days per year

14 day forecast

Thursday
13 Jun
28°C16°C
20 Jun
36°C20°C
Friday
14 Jun
32°C17°C
21 Jun
40°C23°C
Saturday
15 Jun
34°C20°C
22 Jun
41°C27°C
Sunday
16 Jun
30°C20°C
23 Jun
38°C26°C
Monday
17 Jun
26°C17°C
24 Jun
37°C23°C
Tuesday
18 Jun
30°C16°C
25 Jun
34°C22°C
Wednesday
19 Jun
33°C18°C
26 Jun
34°C22°C

Frequently asked questions

How long does it take to travel from Seattle to Ontario?
What is the flight distance between Seattle and Ontario?
What airlines offer nonstop (direct) flights between Seattle and Ontario?
What are the most popular routes to and from Seattle?
What are the most popular routes to and from Ontario?
Which airports are there in Seattle?
What airports are near Seattle?
What airports are near Ontario?
Is it possible to combine flights, buses, and trains in one itinerary when traveling between Seattle and Ontario?
What is Virtual Interlining and how do I use it?
Which airlines fly between Seattle and Ontario?
When's the best time to travel between Seattle and Ontario?
What flights operate between Seattle and Ontario?
How many airports are there near Seattle?
How many airports are there near Ontario?
What time do nonstop (direct) flights between Seattle and Ontario depart?
What time do nonstop (direct) flights between Seattle and Ontario arrive?
What time do flights between Seattle and Ontario depart?
What time do flights between Seattle and Ontario arrive?

Explore alternative trips

Flights from Seattle

Flights to Ontario

Popular routes

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Other destination countries from Seattle

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