Find Cheap Flights from Ontario to Seattle

Depart
Return
1 adult
Adults
18-64
Seniors
65+
Youths
12-17
Children
2-11
Seat Infants
under 2
Lap Infants
under 2
The price shown for each flight will be the average for all passengers including any infants.
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Book cheap flights from Ontario to Seattle

(Round-trip)
Depart: Wed Jul 5 2017 Return: Fri Jul 7 2017 Trip spans 3 days
Delta
Delta
ONT
12:00a
SEA
6:34a
6h 34m
1 stop
SEA
12:00a
ONT
4:39a
4h 39m
1 stop
Depart: Mon Jul 3 2017 Return: Tue Jul 11 2017 Trip spans 9 days
United
United
ONT
12:00a
SEA
6:40a
6h 40m
1 stop
SEA
12:00a
ONT
6:42a
6h 42m
1 stop
Depart: Tue Jul 4 2017 Return: Tue Jul 11 2017 Trip spans 8 days
Major Airline
Major Airline
ONT
12:00a
SEA
2:38a
2h 38m
1 stop
SEA
12:00a
ONT
6:35a
6h 35m
1 stop
Depart: Sun Jul 2 2017 Return: Thu Jul 13 2017 Trip spans 12 days
Multiple Airlines
Multiple Airlines
ONT
12:00a
SEA
4:52a
4h 52m
1 stop
SEA
12:00a
ONT
4:37a
4h 37m
1 stop
Depart: Mon Jul 3 2017 Return: Tue Jul 4 2017 Trip spans 2 days
Alaska Airlines
Alaska Airlines
ONT
12:00a
SEA
2:38a
2h 38m
nonstop
SEA
12:00a
ONT
2:37a
2h 37m
nonstop
Depart: Fri Jun 30 2017 Return: Sun Jul 2 2017 Trip spans 3 days
Southwest
Southwest
ONT
12:00a
SEA
5:00a
5h 00m
1 stop
SEA
12:00a
ONT
4:10a
4h 10m
1 stop
Depart: Wed Jun 28 2017 Return: Mon Jul 3 2017 Trip spans 6 days
Delta
Delta
ONT
12:00a
SEA
4:44a
4h 44m
1 stop
SEA
12:00a
ONT
4:38a
4h 38m
1 stop
Depart: Sun Jul 2 2017 Return: Tue Jul 11 2017 Trip spans 10 days
United
United
ONT
12:00a
SEA
5:47a
5h 47m
1 stop
SEA
12:00a
ONT
5:54a
5h 54m
1 stop
Depart: Sun Jul 2 2017 Return: Fri Jul 14 2017 Trip spans 13 days
American Airlines
American Airlines
ONT
12:00a
SEA
7:03a
7h 03m
1 stop
SEA
12:00a
ONT
2:37a
2h 37m
nonstop
Depart: Tue Jul 4 2017 Return: Thu Jul 6 2017 Trip spans 3 days
United
United
ONT
12:00a
SEA
5:32a
5h 32m
1 stop
SEA
12:00a
ONT
5:54a
5h 54m
1 stop
Depart: Wed Jun 28 2017 Return: Sun Jul 2 2017 Trip spans 5 days
Major Airline
Major Airline
ONT
12:00a
SEA
4:31a
4h 31m
1 stop
SEA
12:00a
ONT
5:00a
5h 00m
1 stop
Depart: Wed Jun 28 2017 Return: Tue Jul 4 2017 Trip spans 7 days
Delta
Delta
ONT
12:00a
SEA
4:44a
4h 44m
1 stop
SEA
12:00a
ONT
4:40a
4h 40m
1 stop
Depart: Sun Jul 2 2017 Return: Tue Jul 4 2017 Trip spans 3 days
Multiple Airlines
Multiple Airlines
ONT
12:00a
SEA
5:17a
5h 17m
1 stop
SEA
12:00a
ONT
4:40a
4h 40m
1 stop
Depart: Wed Jun 28 2017 Return: Thu Jul 6 2017 Trip spans 9 days
United
United
ONT
12:00a
SEA
6:40a
6h 40m
1 stop
SEA
12:00a
ONT
5:54a
5h 54m
1 stop
Depart: Mon Jul 3 2017 Return: Tue Jul 4 2017 Trip spans 2 days
Delta
Delta
ONT
12:00a
SEA
4:50a
4h 50m
1 stop
SEA
12:00a
ONT
4:40a
4h 40m
1 stop
Depart: Sun Jul 2 2017 Return: Tue Jul 4 2017 Trip spans 3 days
United
United
ONT
12:00a
SEA
5:47a
5h 47m
1 stop
SEA
12:00a
ONT
4:21a
4h 21m
1 stop
Depart: Wed Jul 5 2017 Return: Tue Jul 11 2017 Trip spans 7 days
Delta
Delta
ONT
12:00a
SEA
5:24a
5h 24m
1 stop
SEA
12:00a
ONT
6:26a
6h 26m
1 stop
Depart: Mon Jul 3 2017 Return: Sat Jul 15 2017 Trip spans 13 days
United
United
ONT
12:00a
SEA
5:32a
5h 32m
1 stop
SEA
12:00a
ONT
6:51a
6h 51m
1 stop
Depart: Sun Jul 2 2017 Return: Mon Jul 3 2017 Trip spans 2 days
Multiple Airlines
Multiple Airlines
ONT
12:00a
SEA
5:17a
5h 17m
1 stop
SEA
12:00a
ONT
4:38a
4h 38m
1 stop
Depart: Wed Jun 28 2017 Return: Thu Jul 6 2017 Trip spans 9 days
Delta
Delta
ONT
12:00a
SEA
4:44a
4h 44m
1 stop
SEA
12:00a
ONT
4:39a
4h 39m
1 stop
* Prices are per person and are for e–tickets and include all taxes & fees in USD.

We attempt to get accurate prices, however, prices are not guaranteed.

Here's why:

We’re not the seller.
At KAYAK we don’t set the prices, so it’s not possible for us to guarantee what other companies are selling.

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Our service lets you quickly and easily compare results from hundreds of travel sites at once. In this sense, KAYAK is a search engine and we can't guarantee prices we find.

Why aren’t prices accurate 100% of the time?
Prices on airline seats, hotel rooms and car rentals can change frequently. Several people may also be trying to buy the same travel option simultaneously. As a result, you may find, on occasion, that certain prices are no longer available.

If you have more questions or if you have a bad price to report to us,
please send us an email and someone from our team will get back to you promptly.

Airports
Origin

Ontario
$244
Destination

Seattle
$244
Airlines Airline reviews

56 travelers who booked a flight from Ontario to Seattle rated their chosen airlines with an average of 8.4.

Overall
8.7
Boarding
9.1
Crew
8.9
Comfort
8.3
Food
7.6
Entertainment
6.9