Cheap flights from Seattle, WA to Ontario, CA

Flights starting at £45. Choose between Alaska Airlines, United Airlines, or Frontier Airlines to find the best price.

One search, all the flights

We find you the best flight deals and travel hacks so that you can choose how to book.

Rise above all travel anxieties

With the Kiwi.com Guarantee we have your back with whatever happens.

Trusted by millions

Join over 10 million yearly travellers booking with ease.

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, United Airlines, and Frontier Airlines. Seattle and Ontario have 48 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 11.11 - Sun 17.11

AirlineMon 11.11Tue 12.11Wed 13.11Thu 14.11Fri 15.11Sat 16.11Sun 17.11
5335435
1------1111

Weekly direct flights for Mon 18.11 - Sun 24.11

AirlineMon 18.11Tue 19.11Wed 20.11Thu 21.11Fri 22.11Sat 23.11Sun 24.11
5334455
1------1111

Weekly direct flights for Mon 25.11 - Sun 01.12

AirlineMon 25.11Tue 26.11Wed 27.11Thu 28.11Fri 29.11Sat 30.11Sun 01.12
5543443
1111111

Weekly direct flights for Mon 02.12 - Sun 08.12

AirlineMon 02.12Tue 03.12Wed 04.12Thu 05.12Fri 06.12Sat 07.12Sun 08.12
4334434
1---11------1

Check-in for a flight from Seattle to Ontario

NameCarrier codeIATA CodePassport needed during booking
Alaska AirlinesASAASNo
United AirlinesUALUAYes
Frontier AirlinesFFTF9No

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

Friday
8 Nov
25°C9°C
15 Nov
24°C15°C
Saturday
9 Nov
25°C13°C
16 Nov
20°C13°C
Sunday
10 Nov
25°C13°C
17 Nov
22°C12°C
Monday
11 Nov
22°C12°C
18 Nov
24°C14°C
Tuesday
12 Nov
23°C12°C
19 Nov
23°C14°C
Wednesday
13 Nov
27°C14°C
20 Nov
26°C14°C
Thursday
14 Nov
25°C16°C
21 Nov
27°C17°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?
What airports are near Seattle?
What airports are near Ontario?
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

The nearest countries with flights to Ontario

Here is a list of countries people are flying from

Other destination countries from Seattle

Here is a list of countries people are flying to
Find the best connection from Seattle to Ontario
Search flights
We hack the system,
you fly for less