Find Cheap Flights from Ontario to Seattle/Tacoma Intl (ONT - SEA)

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/Tacoma Intl

(Round-trip)
Depart: Sat Dec 9 2017 Return: Tue Dec 12 2017 Trip spans 4 days
Alaska Airlines
Alaska Airlines
ONT
12:00a
SEA
2:49a
2h 49m
nonstop
SEA
12:00a
ONT
2:33a
2h 33m
nonstop
Depart: Wed Mar 28 2018 Return: Wed Apr 4 2018 Trip spans 8 days
Multiple Airlines
Multiple Airlines
ONT
12:00a
SEA
4:45a
4h 45m
1 stop
SEA
12:00a
ONT
6:32a
6h 32m
1 stop
Depart: Fri Jan 19 2018 Return: Tue Jan 23 2018 Trip spans 5 days
Frontier
Frontier
ONT
12:00a
SEA
6:20a
6h 20m
1 stop
SEA
12:00a
ONT
6:01p
18h 01m
1 stop
Depart: Thu Dec 7 2017 Return: Sat Dec 9 2017 Trip spans 3 days
Alaska Airlines
Alaska Airlines
ONT
12:00a
SEA
2:36a
2h 36m
nonstop
SEA
12:00a
ONT
2:33a
2h 33m
nonstop
Depart: Tue Jan 9 2018 Return: Tue Jan 16 2018 Trip spans 8 days
Alaska Airlines
Alaska Airlines
ONT
12:00a
SEA
2:44a
2h 44m
nonstop
SEA
12:00a
ONT
2:36a
2h 36m
nonstop
Depart: Tue Apr 3 2018 Return: Wed Apr 4 2018 Trip spans 2 days
Multiple Airlines
Multiple Airlines
ONT
12:00a
SEA
4:45a
4h 45m
1 stop
SEA
12:00a
ONT
6:32a
6h 32m
1 stop
Depart: Wed Jan 10 2018 Return: Sat Jan 13 2018 Trip spans 4 days
Alaska Airlines
Alaska Airlines
ONT
12:00a
SEA
2:44a
2h 44m
nonstop
SEA
12:00a
ONT
2:36a
2h 36m
nonstop
Depart: Sat Apr 21 2018 Return: Mon Apr 23 2018 Trip spans 3 days
Multiple Airlines
Multiple Airlines
ONT
12:00a
SEA
4:36a
4h 36m
1 stop
SEA
12:00a
ONT
6:21a
6h 21m
1 stop
Depart: Tue May 22 2018 Return: Wed May 30 2018 Trip spans 9 days
Frontier
Frontier
ONT
12:00a
SEA
1:50p
13h 50m
1 stop
SEA
12:00a
ONT
2:43p
14h 43m
1 stop
Depart: Wed Feb 7 2018 Return: Wed Feb 14 2018 Trip spans 8 days
Alaska Airlines
Alaska Airlines
ONT
12:00a
SEA
2:40a
2h 40m
nonstop
SEA
12:00a
ONT
2:34a
2h 34m
nonstop
Depart: Thu May 31 2018 Return: Mon Jun 4 2018 Trip spans 5 days
Multiple Airlines
Multiple Airlines
ONT
12:00a
SEA
4:36a
4h 36m
1 stop
SEA
12:00a
ONT
2:43p
14h 43m
1 stop
Depart: Fri Feb 2 2018 Return: Sat Feb 3 2018 Trip spans 2 days
Alaska Airlines
Alaska Airlines
ONT
12:00a
SEA
2:44a
2h 44m
nonstop
SEA
12:00a
ONT
2:36a
2h 36m
nonstop
Depart: Thu Jan 25 2018 Return: Mon Jan 29 2018 Trip spans 5 days
Alaska Airlines
Alaska Airlines
ONT
12:00a
SEA
2:44a
2h 44m
nonstop
SEA
12:00a
ONT
2:36a
2h 36m
nonstop
Depart: Fri Apr 27 2018 Return: Sat May 5 2018 Trip spans 9 days
Multiple Airlines
Multiple Airlines
ONT
12:00a
SEA
2:40a
2h 40m
nonstop
SEA
12:00a
ONT
2:34a
2h 34m
nonstop
Depart: Mon Mar 5 2018 Return: Fri Mar 9 2018 Trip spans 5 days
Alaska Airlines
Alaska Airlines
ONT
12:00a
SEA
4:36a
4h 36m
1 stop
SEA
12:00a
ONT
5:38a
5h 38m
1 stop
Depart: Sat May 12 2018 Return: Sun May 20 2018 Trip spans 9 days
Multiple Airlines
Multiple Airlines
ONT
12:00a
SEA
2:40a
2h 40m
nonstop
SEA
12:00a
ONT
2:30a
2h 30m
nonstop
Depart: Mon Dec 18 2017 Return: Sun Dec 24 2017 Trip spans 7 days
Alaska Airlines
Alaska Airlines
ONT
12:00a
SEA
2:36a
2h 36m
nonstop
SEA
12:00a
ONT
2:33a
2h 33m
nonstop
Depart: Wed Dec 27 2017 Return: Sat Dec 30 2017 Trip spans 4 days
Multiple Airlines
Multiple Airlines
ONT
12:00a
SEA
2:49a
2h 49m
nonstop
SEA
12:00a
ONT
2:33a
2h 33m
nonstop
Depart: Mon Dec 25 2017 Return: Sun Dec 31 2017 Trip spans 7 days
Alaska Airlines
Alaska Airlines
ONT
12:00a
SEA
2:49a
2h 49m
nonstop
SEA
12:00a
ONT
2:33a
2h 33m
nonstop
Direct flights ONT to SEA on American Airlines
Flight # Depart ONT Arrive SEA Sun Mon Tue Wed Thu Fri Sat Valid Between
7050 6:00 am 8:49 am Dec 16 - Dec 22
7050 6:00 am 8:49 am Dec 26 - Dec 31
7050 6:00 am 8:49 am Dec 23 - Dec 30
7050 6:00 am 8:49 am Dec 15 - Dec 20
7036 10:18 am 12:54 pm Dec 28 - Dec 30
7036 10:18 am 12:54 pm Dec 22 - Dec 29
7036 10:18 am 12:54 pm Dec 19 - Dec 24
7036 10:18 am 12:54 pm Dec 14 - Dec 21
7036 10:18 am 12:54 pm Dec 11 - Dec 17
7036 10:18 am 12:54 pm Dec 5 - Dec 10
7036 10:18 am 12:54 pm Dec 3 - Dec 9
7036 10:20 am 1:06 pm Nov 25 - Nov 29
7036 10:20 am 1:06 pm Nov 30 - Dec 2
7036 10:20 am 1:06 pm Nov 20 - Nov 28
* 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 and someone from our team will get back to you promptly.

Airports
Origin

Ontario
$137
Destination

Seattle
$137