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 May 27 2017 Return: Sun Jun 4 2017 Trip spans 9 days
United
United
ONT
3:10p
SEA
9:16p
6h 06m
1 stop
SEA
9:57a
ONT
4:36p
6h 39m
1 stop
Depart: Thu Sep 14 2017 Return: Wed Sep 20 2017 Trip spans 7 days
Southwest
Southwest
ONT
2:00a
SEA
5:40a
3h 40m
1 stop
SEA
7:40a
ONT
11:40a
4h 00m
1 stop
Depart: Sat Aug 26 2017 Return: Tue Aug 29 2017 Trip spans 4 days
Major Airline
Major Airline
ONT
2:58a
SEA
8:19a
5h 21m
1 stop
SEA
3:06a
ONT
11:45a
8h 39m
1 stop
Depart: Sat Sep 9 2017 Return: Tue Sep 12 2017 Trip spans 4 days
Delta
Delta
ONT
9:00a
SEA
2:00p
5h 00m
1 stop
SEA
2:25p
ONT
6:44p
4h 19m
1 stop
Depart: Tue Aug 8 2017 Return: Wed Aug 16 2017 Trip spans 9 days
Alaska Airlines
Alaska Airlines
ONT
1:15p
SEA
3:45p
2h 30m
nonstop
SEA
3:50p
ONT
6:18p
2h 28m
nonstop
Depart: Thu Oct 5 2017 Return: Thu Oct 19 2017 Trip spans 15 days
American Airlines
American Airlines
ONT
3:30p
SEA
9:35p
6h 05m
1 stop
SEA
5:10p
ONT
7:37p
2h 27m
nonstop
Depart: Tue Jul 18 2017 Return: Sat Jul 22 2017 Trip spans 5 days
United
United
ONT
4:10p
SEA
9:00p
4h 50m
1 stop
SEA
1:43a
ONT
6:04a
4h 21m
1 stop
Depart: Wed Oct 18 2017 Return: Sat Oct 28 2017 Trip spans 11 days
Southwest
Southwest
ONT
1:30a
SEA
5:25a
3h 55m
1 stop
SEA
9:45a
ONT
1:25p
3h 40m
nonstop
Depart: Wed Sep 20 2017 Return: Sat Sep 30 2017 Trip spans 11 days
United
United
ONT
5:10a
SEA
11:00a
5h 50m
1 stop
SEA
9:20a
ONT
4:38p
7h 18m
1 stop
Depart: Mon Oct 9 2017 Return: Fri Oct 20 2017 Trip spans 12 days
Southwest
Southwest
ONT
1:30a
SEA
5:25a
3h 55m
1 stop
SEA
2:50p
ONT
6:55p
4h 05m
1 stop
Depart: Wed Sep 6 2017 Return: Wed Sep 13 2017 Trip spans 8 days
Major Airline
Major Airline
ONT
3:25a
SEA
9:02a
5h 37m
2 stops
SEA
7:54a
ONT
11:45a
3h 51m
2 stops
Depart: Wed Oct 4 2017 Return: Wed Oct 11 2017 Trip spans 8 days
Delta
Delta
ONT
2:00a
SEA
8:20a
6h 20m
1 stop
SEA
12:55p
ONT
6:44p
5h 49m
1 stop
Depart: Wed Aug 9 2017 Return: Tue Aug 15 2017 Trip spans 7 days
Alaska Airlines
Alaska Airlines
ONT
2:20a
SEA
5:03a
2h 43m
nonstop
SEA
3:50p
ONT
6:18p
2h 28m
nonstop
Depart: Sat Sep 23 2017 Return: Sat Sep 30 2017 Trip spans 8 days
United
United
ONT
3:15p
SEA
8:51p
5h 36m
1 stop
SEA
9:20a
ONT
4:38p
7h 18m
1 stop
Depart: Tue Oct 3 2017 Return: Mon Oct 9 2017 Trip spans 7 days
Major Airline
Major Airline
ONT
3:40a
SEA
6:13a
2h 33m
3 stops
SEA
7:55a
ONT
11:48a
3h 53m
3 stops
Depart: Wed Sep 13 2017 Return: Mon Sep 18 2017 Trip spans 6 days
Southwest
Southwest
ONT
2:00a
SEA
5:40a
3h 40m
1 stop
SEA
2:00a
ONT
6:05a
4h 05m
1 stop
Depart: Mon Aug 14 2017 Return: Thu Aug 17 2017 Trip spans 4 days
Alaska Airlines
Alaska Airlines
ONT
2:20a
SEA
5:03a
2h 43m
nonstop
SEA
3:50p
ONT
6:18p
2h 28m
nonstop
Depart: Sat Sep 16 2017 Return: Tue Sep 26 2017 Trip spans 11 days
Delta
Delta
ONT
9:00a
SEA
2:00p
5h 00m
1 stop
SEA
2:25p
ONT
6:44p
4h 19m
1 stop
Depart: Fri Sep 15 2017 Return: Sun Sep 17 2017 Trip spans 3 days
American Airlines
American Airlines
ONT
7:50a
SEA
10:23a
2h 33m
nonstop
SEA
3:30a
ONT
6:01a
2h 31m
nonstop
Depart: Tue Aug 15 2017 Return: Wed Aug 16 2017 Trip spans 2 days
Alaska Airlines
Alaska Airlines
ONT
2:20a
SEA
5:03a
2h 43m
nonstop
SEA
3:50p
ONT
6:18p
2h 28m
nonstop
Direct flights ONT to SEA on American Airlines
Flight # Depart ONT Arrive SEA Sun Mon Tue Wed Thu Fri Sat Valid Between
7050 6:20 am 8:58 am Jun 4 - Jun 12
7050 6:20 am 8:58 am Jun 6 - Jun 10
7050 6:20 am 8:58 am Jun 13 - Jun 19
7050 6:20 am 8:58 am Jun 14 - Jun 23
7050 6:20 am 8:54 am Jun 20 - Jun 20
7050 6:20 am 8:58 am Jun 24 - Jun 26
7050 6:20 am 8:58 am Jun 25 - Jul 2
7050 6:20 am 8:58 am Jul 3 - Jul 14
7050 6:20 am 8:55 am May 30 - Jun 3
7613 12:00 pm 2:38 pm Jun 4 - Aug 26
7613 12:04 pm 2:50 pm May 20 - Jun 3
* 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
$160
Destination

Seattle
$160
Airlines Airline reviews

50 travelers who booked a flight from Ontario to Seattle rated their chosen airlines with an average of 8.3.

Overall
8.6
Boarding
9.0
Crew
8.8
Comfort
8.1
Food
7.5
Entertainment
6.8