Find Deals on 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 Mar 5 2016 Return: Sun Mar 6 2016 Trip spans 2 days
American Airlines
American Airlines
ONT
2:20p
SEA
9:01p
6h 41m
1 stop
SEA
12:00a
ONT
6:34a
6h 34m
1 stop
Depart: Thu Feb 18 2016 Return: Sun Mar 6 2016 Trip spans 18 days
American Airlines
American Airlines
ONT
7:35a
SEA
2:39p
7h 04m
1 stop
SEA
12:59p
ONT
7:11p
6h 12m
1 stop
Depart: Tue Feb 23 2016 Return: Wed Feb 24 2016 Trip spans 2 days
American Airlines
American Airlines
ONT
7:35a
SEA
2:39p
7h 04m
1 stop
SEA
12:10a
ONT
6:34a
6h 24m
1 stop
Depart: Wed Feb 24 2016 Return: Thu Feb 25 2016 Trip spans 2 days
American Airlines
American Airlines
ONT
7:35a
SEA
2:39p
7h 04m
1 stop
SEA
12:10a
ONT
6:34a
6h 24m
1 stop
Depart: Thu Feb 25 2016 Return: Sat Feb 27 2016 Trip spans 3 days
American Airlines
American Airlines
ONT
7:35a
SEA
2:39p
7h 04m
1 stop
SEA
9:55a
ONT
4:27p
6h 32m
1 stop
Depart: Fri Feb 26 2016 Return: Sat Feb 27 2016 Trip spans 2 days
American Airlines
American Airlines
ONT
7:35a
SEA
2:39p
7h 04m
1 stop
SEA
12:10a
ONT
6:34a
6h 24m
1 stop
Depart: Sat Feb 27 2016 Return: Sun Feb 28 2016 Trip spans 2 days
American Airlines
American Airlines
ONT
1:15a
SEA
8:45a
7h 30m
1 stop
SEA
12:10a
ONT
6:34a
6h 24m
1 stop
Depart: Mon Feb 29 2016 Return: Sun Mar 6 2016 Trip spans 7 days
American Airlines
American Airlines
ONT
11:40a
SEA
6:10p
6h 30m
1 stop
SEA
12:59p
ONT
7:11p
6h 12m
1 stop
Depart: Tue Mar 1 2016 Return: Wed Mar 2 2016 Trip spans 2 days
American Airlines
American Airlines
ONT
7:35a
SEA
2:39p
7h 04m
1 stop
SEA
12:10a
ONT
6:34a
6h 24m
1 stop
Depart: Wed Mar 2 2016 Return: Sun Mar 6 2016 Trip spans 5 days
American Airlines
American Airlines
ONT
7:35a
SEA
2:39p
7h 04m
1 stop
SEA
12:00a
ONT
6:34a
6h 34m
1 stop
Depart: Thu Mar 3 2016 Return: Sun Mar 6 2016 Trip spans 4 days
American Airlines
American Airlines
ONT
7:35a
SEA
2:39p
7h 04m
1 stop
SEA
12:59p
ONT
7:11p
6h 12m
1 stop
Depart: Fri Mar 4 2016 Return: Sat Mar 5 2016 Trip spans 2 days
American Airlines
American Airlines
ONT
7:35a
SEA
2:39p
7h 04m
1 stop
SEA
9:55a
ONT
4:35p
6h 40m
1 stop
Depart: Sun Mar 6 2016 Return: Tue Mar 8 2016 Trip spans 3 days
American Airlines
American Airlines
ONT
2:20p
SEA
9:01p
6h 41m
1 stop
SEA
9:55a
ONT
4:35p
6h 40m
1 stop
Depart: Tue Mar 8 2016 Return: Wed Mar 9 2016 Trip spans 2 days
American Airlines
American Airlines
ONT
1:25a
SEA
8:45a
7h 20m
1 stop
SEA
12:00a
ONT
6:34a
6h 34m
1 stop
Depart: Wed Mar 9 2016 Return: Thu Mar 10 2016 Trip spans 2 days
American Airlines
American Airlines
ONT
1:25a
SEA
8:45a
7h 20m
1 stop
SEA
12:00a
ONT
6:34a
6h 34m
1 stop
Depart: Thu Mar 10 2016 Return: Sat Mar 12 2016 Trip spans 3 days
American Airlines
American Airlines
ONT
7:35a
SEA
2:39p
7h 04m
1 stop
SEA
9:55a
ONT
4:35p
6h 40m
1 stop
Depart: Tue Mar 15 2016 Return: Mon Mar 21 2016 Trip spans 7 days
Alaska Airlines
Alaska Airlines
ONT
7:00a
SEA
9:35a
2h 35m
nonstop
SEA
3:40a
ONT
6:09a
2h 29m
nonstop
Depart: Mon Mar 14 2016 Return: Mon Mar 21 2016 Trip spans 8 days
Delta
Delta
ONT
2:00a
SEA
8:10a
6h 10m
1 stop
SEA
2:15p
ONT
6:44p
4h 29m
1 stop
Depart: Mon Mar 7 2016 Return: Tue Mar 8 2016 Trip spans 2 days
United
United
ONT
7:49a
SEA
3:03p
7h 14m
1 stop
SEA
10:10a
ONT
2:56p
4h 46m
1 stop
Depart: Tue Jun 7 2016 Return: Mon Jun 27 2016 Trip spans 21 days
Southwest
Southwest
ONT
2:20p
SEA
7:15p
4h 55m
1 stop
SEA
5:45a
ONT
9:45a
4h 00m
nonstop
Direct flights ONT to SEA on Delta
Flight # Depart ONT Arrive SEA Sun Mon Tue Wed Thu Fri Sat Valid Between
9038 10:50 am 1:30 pm Feb 11 - Mar 12
9039 11:00 am 1:35 pm Mar 13 - Mar 14
9039 11:00 am 1:35 pm Mar 16 - Mar 27
9039 11:00 am 1:35 pm Mar 15 - Mar 29
* Prices are per person and are for e–tickets and include all taxes & fees in USD.

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

Here's why:

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

We aggregate tons 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 don'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.

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
$186
Destination

Seattle
$186