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Find Flight Deals from Ontario to Seattle/Tacoma Intl (ONT - SEA)

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: Tue May 5 2015 Return: Wed May 6 2015 Trip spans 2 days
Alaska Airlines
Alaska Airlines
ONT
2:00a
SEA
4:37a
2h 37m
nonstop
SEA
4:55p
ONT
7:20p
2h 25m
nonstop
Depart: Sat May 9 2015 Return: Tue May 12 2015 Trip spans 4 days
Alaska Airlines
Alaska Airlines
ONT
2:00a
SEA
4:37a
2h 37m
nonstop
SEA
3:25a
ONT
5:47a
2h 22m
nonstop
Depart: Tue May 12 2015 Return: Wed May 13 2015 Trip spans 2 days
Alaska Airlines
Alaska Airlines
ONT
2:00a
SEA
4:37a
2h 37m
nonstop
SEA
3:25a
ONT
5:47a
2h 22m
nonstop
Depart: Sat May 2 2015 Return: Tue May 5 2015 Trip spans 4 days
Alaska Airlines
Alaska Airlines
ONT
6:30a
SEA
9:05a
2h 35m
nonstop
SEA
3:25a
ONT
5:47a
2h 22m
nonstop
Depart: Wed May 13 2015 Return: Sat May 16 2015 Trip spans 4 days
Alaska Airlines
Alaska Airlines
ONT
6:30a
SEA
9:02a
2h 32m
nonstop
SEA
3:25a
ONT
5:47a
2h 22m
nonstop
Depart: Tue May 19 2015 Return: Wed May 27 2015 Trip spans 9 days
Alaska Airlines
Alaska Airlines
ONT
2:00a
SEA
4:37a
2h 37m
nonstop
SEA
4:55p
ONT
7:20p
2h 25m
nonstop
Depart: Fri Apr 24 2015 Return: Tue Apr 28 2015 Trip spans 5 days
American Airlines
American Airlines
ONT
8:35a
SEA
3:38p
7h 03m
1 stop
SEA
1:15a
ONT
7:33a
6h 18m
1 stop
Depart: Sat Apr 25 2015 Return: Tue Apr 28 2015 Trip spans 4 days
Delta
Delta
ONT
12:35p
SEA
5:17p
4h 42m
1 stop
SEA
2:20p
ONT
6:46p
4h 26m
1 stop
Depart: Sun Apr 26 2015 Return: Tue Apr 28 2015 Trip spans 3 days
United
United
ONT
1:30a
SEA
6:13a
4h 43m
1 stop
SEA
5:05a
ONT
9:36a
4h 31m
1 stop
Depart: Tue Apr 28 2015 Return: Wed Apr 29 2015 Trip spans 2 days
Delta
Delta
ONT
12:35p
SEA
7:17p
6h 42m
1 stop
SEA
2:20p
ONT
6:46p
4h 26m
1 stop
Depart: Wed Apr 29 2015 Return: Sat May 2 2015 Trip spans 4 days
United
United
ONT
1:53p
SEA
6:01p
4h 08m
1 stop
SEA
4:15a
ONT
9:34a
5h 19m
1 stop
Depart: Thu Apr 30 2015 Return: Sun May 3 2015 Trip spans 4 days
United
United
ONT
3:18p
SEA
8:45p
5h 27m
1 stop
SEA
3:49p
ONT
8:09p
4h 20m
1 stop
Depart: Sun May 3 2015 Return: Thu May 7 2015 Trip spans 5 days
United
United
ONT
1:30a
SEA
6:13a
4h 43m
1 stop
SEA
6:50a
ONT
12:10p
5h 20m
1 stop
Depart: Mon May 4 2015 Return: Thu May 7 2015 Trip spans 4 days
United
United
ONT
3:18p
SEA
7:39p
4h 21m
1 stop
SEA
6:50a
ONT
1:20p
6h 30m
1 stop
Depart: Wed May 6 2015 Return: Fri May 8 2015 Trip spans 3 days
United
United
ONT
8:57a
SEA
2:00p
5h 03m
1 stop
SEA
1:24a
ONT
6:13a
4h 49m
1 stop
Depart: Thu May 7 2015 Return: Fri May 8 2015 Trip spans 2 days
United
United
ONT
1:30a
SEA
9:05a
7h 35m
1 stop
SEA
6:50a
ONT
1:20p
6h 30m
1 stop
Depart: Fri May 8 2015 Return: Sun May 10 2015 Trip spans 3 days
United
United
ONT
1:50p
SEA
7:01p
5h 11m
1 stop
SEA
4:50a
ONT
12:10p
7h 20m
1 stop
Depart: Sun May 10 2015 Return: Wed May 13 2015 Trip spans 4 days
United
United
ONT
4:39p
SEA
8:55p
4h 16m
1 stop
SEA
11:44a
ONT
4:25p
4h 41m
1 stop
Depart: Mon May 11 2015 Return: Wed May 13 2015 Trip spans 3 days
United
United
ONT
3:17p
SEA
7:41p
4h 24m
1 stop
SEA
3:42a
ONT
8:17a
4h 35m
1 stop
Depart: Fri Aug 7 2015 Return: Fri Aug 14 2015 Trip spans 8 days
US Airways
US Airways
ONT
3:25p
SEA
9:29p
6h 04m
1 stop
SEA
2:00p
ONT
7:57p
5h 57m
1 stop
Direct flights ONT to SEA on Delta
Flight # Depart ONT Arrive SEA Sun Mon Tue Wed Thu Fri Sat Valid Between
9044 6:00 am 8:37 am May 4 - May 10
9044 6:00 am 8:39 am Apr 24 - Apr 26
9044 6:00 am 8:39 am Apr 27 - May 2
9044 6:00 am 8:39 am Apr 28 - Apr 28
9044 6:00 am 8:39 am May 1 - May 1
9044 6:00 am 8:37 am May 7 - May 11
9044 6:00 am 8:37 am May 8 - May 15
9044 6:00 am 8:37 am May 16 - May 23
9044 6:00 am 8:37 am May 21 - May 26
9044 6:00 am 8:37 am May 24 - May 31
9044 6:00 am 8:37 am May 25 - Jun 1
9044 6:00 am 8:37 am May 3 - May 9
9099 10:30 am 1:02 pm May 22 - May 29
9099 10:30 am 1:02 pm May 23 - May 23
9099 10:30 am 1:05 pm Apr 25 - May 1
9099 10:30 am 1:05 pm Apr 27 - May 2
9099 10:30 am 1:02 pm May 3 - May 10
9099 10:30 am 1:02 pm May 4 - May 4
9099 10:30 am 1:02 pm May 11 - May 21
9099 10:30 am 1:02 pm May 15 - May 15
Airports
Origin

Ontario
$174
Destination

Seattle
$174