Find Deals on 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.
Compare vs. KAYAK all | none
Browse Origins:
Browse Destinations:

Dates flexible? Here are the best fares found in the past 48 hours...

Book cheap flights from Ontario to Seattle

(Round-trip)
Depart: Tue Mar 14 2017 Return: Wed Mar 22 2017 Trip spans 9 days
Alaska Airlines
Alaska Airlines
ONT
7:45a
SEA
10:17a
2h 32m
nonstop
SEA
3:25a
ONT
5:52a
2h 27m
nonstop
Depart: Mon Apr 3 2017 Return: Sat Apr 8 2017 Trip spans 6 days
Major Airline
Major Airline
ONT
9:30a
SEA
12:12p
2h 42m
nonstop
SEA
11:50a
ONT
2:21p
2h 31m
nonstop
Depart: Wed Mar 15 2017 Return: Tue Mar 21 2017 Trip spans 7 days
United
United
ONT
3:15p
SEA
9:13p
5h 58m
1 stop
SEA
1:40a
ONT
6:11a
4h 31m
1 stop
Depart: Tue Feb 28 2017 Return: Wed Mar 1 2017 Trip spans 2 days
American Airlines
American Airlines
ONT
11:30a
SEA
6:34p
7h 04m
1 stop
SEA
6:15a
ONT
1:28p
7h 13m
1 stop
Depart: Sat Mar 4 2017 Return: Fri Mar 10 2017 Trip spans 7 days
Delta
Delta
ONT
5:18a
SEA
1:11p
7h 53m
1 stop
SEA
1:25p
ONT
5:51p
4h 26m
1 stop
Depart: Thu Mar 16 2017 Return: Mon Mar 20 2017 Trip spans 5 days
Alaska Airlines
Alaska Airlines
ONT
1:30p
SEA
4:12p
2h 42m
nonstop
SEA
3:25a
ONT
5:54a
2h 29m
nonstop
Depart: Fri Mar 17 2017 Return: Wed Apr 5 2017 Trip spans 20 days
Alaska Airlines
Alaska Airlines
ONT
1:30p
SEA
4:12p
2h 42m
nonstop
SEA
3:25a
ONT
5:52a
2h 27m
nonstop
Depart: Mon Mar 20 2017 Return: Tue Mar 21 2017 Trip spans 2 days
Alaska Airlines
Alaska Airlines
ONT
7:45a
SEA
10:20a
2h 35m
nonstop
SEA
10:00a
ONT
12:31p
2h 31m
nonstop
Depart: Tue May 30 2017 Return: Mon Jun 5 2017 Trip spans 7 days
Major Airline
Major Airline
ONT
10:20p
SEA
12:55a
2h 35m
nonstop
SEA
12:40a
ONT
3:17a
2h 37m
nonstop
Depart: Wed Mar 1 2017 Return: Tue Apr 18 2017 Trip spans 48 days
United
United
ONT
3:10p
SEA
8:13p
5h 03m
1 stop
SEA
1:57a
ONT
6:11a
4h 14m
1 stop
Depart: Fri Mar 31 2017 Return: Tue Apr 4 2017 Trip spans 5 days
Alaska Airlines
Alaska Airlines
ONT
7:45a
SEA
10:17a
2h 32m
nonstop
SEA
3:50p
ONT
6:21p
2h 31m
nonstop
Depart: Sat Apr 15 2017 Return: Sat Apr 22 2017 Trip spans 8 days
Major Airline
Major Airline
ONT
3:00a
SEA
8:16a
5h 16m
1 stop
SEA
3:10p
ONT
2:23a
11h 13m
1 stop
Depart: Thu Mar 2 2017 Return: Tue Apr 18 2017 Trip spans 47 days
United
United
ONT
12:55a
SEA
6:21a
5h 26m
1 stop
SEA
1:57a
ONT
6:11a
4h 14m
1 stop
Depart: Tue Apr 4 2017 Return: Mon Apr 10 2017 Trip spans 7 days
Alaska Airlines
Alaska Airlines
ONT
2:20a
SEA
4:55a
2h 35m
nonstop
SEA
3:50p
ONT
6:14p
2h 24m
nonstop
Depart: Fri Mar 10 2017 Return: Tue Mar 14 2017 Trip spans 4 days
American Airlines
American Airlines
ONT
2:35p
SEA
8:53p
6h 18m
1 stop
SEA
1:00a
ONT
7:48a
6h 48m
1 stop
Depart: Wed Apr 5 2017 Return: Mon Apr 10 2017 Trip spans 6 days
Alaska Airlines
Alaska Airlines
ONT
2:20a
SEA
4:55a
2h 35m
nonstop
SEA
3:50p
ONT
6:14p
2h 24m
nonstop
Depart: Sun Jul 23 2017 Return: Thu Jul 27 2017 Trip spans 5 days
Major Airline
Major Airline
ONT
10:20p
SEA
1:03a
2h 43m
nonstop
SEA
5:40a
ONT
8:16a
2h 36m
nonstop
Depart: Tue Mar 7 2017 Return: Tue Mar 14 2017 Trip spans 7 days
United
United
ONT
12:55a
SEA
7:51a
6h 56m
1 stop
SEA
3:10p
ONT
8:06p
4h 56m
1 stop
Depart: Sun Mar 5 2017 Return: Wed Mar 8 2017 Trip spans 4 days
Delta
Delta
ONT
1:00a
SEA
5:55a
4h 55m
1 stop
SEA
11:40a
ONT
6:10p
6h 30m
1 stop
Depart: Wed Apr 12 2017 Return: Sun Apr 16 2017 Trip spans 5 days
Alaska Airlines
Alaska Airlines
ONT
2:20a
SEA
5:03a
2h 43m
nonstop
SEA
3:25a
ONT
5:52a
2h 27m
nonstop
* 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.

We compile tonnes of data for you
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
$137
Destination

Seattle
$137
Airlines Airline reviews

41 travelers who booked a flight from Ontario to Seattle rated their chosen airlines with an average of 8.1.

Overall
8.4
Boarding
8.9
Crew
8.7
Comfort
7.8
Food
7.2
Entertainment
6.3