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
Students
under 26
The price shown for each flight will be the average for all passengers including any infants.
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Book cheap flights from Ontario to Seattle/Tacoma Intl

(Round-trip)
Depart: Wed Oct 12 2016 Return: Sat Oct 15 2016 Trip spans 4 days
Alaska Airlines
Alaska Airlines
ONT
2:00a
SEA
4:40a
2h 40m
nonstop
SEA
4:40p
ONT
7:06p
2h 26m
nonstop
Depart: Mon Oct 17 2016 Return: Sat Oct 22 2016 Trip spans 6 days
Major Airline
Major Airline
ONT
10:00p
SEA
12:40a
2h 40m
nonstop
SEA
6:35a
ONT
9:05a
2h 30m
nonstop
Depart: Thu Nov 17 2016 Return: Mon Nov 21 2016 Trip spans 5 days
United
United
ONT
3:20p
SEA
8:12p
4h 52m
1 stop
SEA
8:57a
ONT
2:47p
5h 50m
1 stop
Depart: Fri Jan 6 2017 Return: Tue Jan 10 2017 Trip spans 5 days
American Airlines
American Airlines
ONT
5:00a
SEA
11:45a
6h 45m
1 stop
SEA
6:21a
ONT
11:01a
4h 40m
1 stop
Depart: Tue Jan 3 2017 Return: Tue Jan 24 2017 Trip spans 22 days
Southwest
Southwest
ONT
12:50p
SEA
6:55p
6h 05m
1 stop
SEA
9:30a
ONT
3:35p
6h 05m
1 stop
Depart: Fri Oct 7 2016 Return: Sun Oct 9 2016 Trip spans 3 days
Delta
Delta
ONT
2:00a
SEA
7:15a
5h 15m
1 stop
SEA
6:14a
ONT
12:05p
5h 51m
1 stop
Depart: Sat Oct 15 2016 Return: Wed Oct 19 2016 Trip spans 5 days
Alaska Airlines
Alaska Airlines
ONT
2:00a
SEA
4:40a
2h 40m
nonstop
SEA
4:40p
ONT
7:06p
2h 26m
nonstop
Depart: Wed Oct 19 2016 Return: Tue Oct 25 2016 Trip spans 7 days
Major Airline
Major Airline
ONT
2:40a
SEA
7:10a
4h 30m
nonstop
SEA
1:35p
ONT
5:35p
4h 00m
nonstop
Depart: Tue Oct 18 2016 Return: Sat Oct 22 2016 Trip spans 5 days
Alaska Airlines
Alaska Airlines
ONT
2:00a
SEA
4:40a
2h 40m
nonstop
SEA
4:40p
ONT
7:06p
2h 26m
nonstop
Depart: Tue Nov 29 2016 Return: Wed Nov 30 2016 Trip spans 2 days
Major Airline
Major Airline
ONT
1:35p
SEA
7:10p
5h 35m
1 stop
SEA
12:05p
ONT
4:00p
3h 55m
nonstop
Depart: Thu Oct 20 2016 Return: Mon Oct 24 2016 Trip spans 5 days
Alaska Airlines
Alaska Airlines
ONT
2:00a
SEA
4:40a
2h 40m
nonstop
SEA
4:40p
ONT
7:06p
2h 26m
nonstop
Depart: Sat Feb 11 2017 Return: Wed Feb 22 2017 Trip spans 12 days
United
United
ONT
1:00a
SEA
6:11a
5h 11m
1 stop
SEA
1:00a
ONT
5:08a
4h 08m
1 stop
Depart: Wed Nov 30 2016 Return: Wed Dec 7 2016 Trip spans 8 days
Major Airline
Major Airline
ONT
1:45a
SEA
6:10a
4h 25m
1 stop
SEA
12:05p
ONT
4:00p
3h 55m
nonstop
Depart: Sat Oct 22 2016 Return: Mon Oct 24 2016 Trip spans 3 days
Alaska Airlines
Alaska Airlines
ONT
7:05a
SEA
9:40a
2h 35m
nonstop
SEA
4:40p
ONT
7:06p
2h 26m
nonstop
Depart: Fri Dec 16 2016 Return: Sat Jan 14 2017 Trip spans 30 days
Major Airline
Major Airline
ONT
8:00p
SEA
10:37p
2h 37m
nonstop
SEA
5:15a
ONT
10:23a
5h 08m
1 stop
Depart: Fri Nov 18 2016 Return: Mon Nov 21 2016 Trip spans 4 days
United
United
ONT
3:20p
SEA
8:12p
4h 52m
1 stop
SEA
8:57a
ONT
2:47p
5h 50m
1 stop
Depart: Sun Oct 23 2016 Return: Wed Oct 26 2016 Trip spans 4 days
Alaska Airlines
Alaska Airlines
ONT
2:00a
SEA
4:40a
2h 40m
nonstop
SEA
4:40p
ONT
7:06p
2h 26m
nonstop
Depart: Sat Oct 1 2016 Return: Sun Oct 2 2016 Trip spans 2 days
American Airlines
American Airlines
ONT
8:30a
SEA
4:11p
7h 41m
1 stop
SEA
1:00a
ONT
7:30a
6h 30m
1 stop
Depart: Tue Jan 17 2017 Return: Sat Jan 21 2017 Trip spans 5 days
Major Airline
Major Airline
ONT
1:10a
SEA
5:35a
4h 25m
1 stop
SEA
10:05a
ONT
2:00p
3h 55m
nonstop
Depart: Tue Oct 25 2016 Return: Wed Oct 26 2016 Trip spans 2 days
Alaska Airlines
Alaska Airlines
ONT
2:00a
SEA
4:40a
2h 40m
nonstop
SEA
10:35a
ONT
1:05p
2h 30m
nonstop
Direct flights ONT to SEA on Delta
Flight # Depart ONT Arrive SEA Sun Mon Tue Wed Thu Fri Sat Valid Between
9128 6:00 am 8:40 am Oct 31 - Nov 4
9128 6:00 am 8:40 am Oct 29 - Nov 1
9128 6:00 am 8:40 am Oct 23 - Oct 28
9128 6:00 am 8:40 am Oct 22 - Oct 22
9128 6:00 am 8:40 am Oct 15 - Oct 19
9128 6:00 am 8:40 am Nov 5 - Nov 5
9128 6:00 am 8:40 am Nov 6 - Nov 6
9128 6:00 am 8:40 am Oct 3 - Oct 10
9128 6:00 am 8:40 am Oct 8 - Oct 8
9128 6:00 am 8:40 am Oct 11 - Oct 21
9128 6:00 am 8:40 am Oct 12 - Oct 12
9127 11:00 am 1:36 pm Nov 6 - Nov 19
9127 11:00 am 1:36 pm Nov 7 - Nov 14
9127 11:05 am 1:40 pm Oct 9 - Oct 16
9127 11:05 am 1:40 pm Oct 3 - Oct 8
9127 11:05 am 1:40 pm Oct 23 - Oct 28
9127 11:05 am 1:40 pm Nov 1 - Nov 5
9127 11:05 am 1:40 pm Oct 30 - Nov 4
9127 11:05 am 1:40 pm Oct 22 - Oct 29
9127 11:05 am 1:40 pm Oct 20 - Nov 3
9127 11:05 am 1:40 pm Oct 11 - Oct 21
* Prices are per person and are for e–tickets and include all taxes & fees in USD.

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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.

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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.

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Airports
Origin

Ontario
$137
Destination

Seattle
$137
Airlines Airline reviews

28 travelers who booked a flight from Ontario to Seattle rated their chosen airlines with an average of 8.2.

Overall
8.4
Boarding
9.1
Crew
8.8
Comfort
7.9
Food
7.2
Entertainment
6.3