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.
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Book cheap flights from Ontario to Seattle/Tacoma Intl

(Round-trip)
Depart: Mon Sep 19 2016 Return: Wed Sep 28 2016 Trip spans 10 days
Depart: Tue Sep 20 2016 Return: Thu Sep 22 2016 Trip spans 3 days
Depart: Wed Sep 7 2016 Return: Tue Sep 13 2016 Trip spans 7 days
Depart: Fri Jan 6 2017 Return: Sun Jan 8 2017 Trip spans 3 days
Depart: Wed Sep 21 2016 Return: Thu Sep 22 2016 Trip spans 2 days
Depart: Mon Oct 10 2016 Return: Tue Oct 11 2016 Trip spans 2 days
Depart: Thu Sep 22 2016 Return: Fri Sep 23 2016 Trip spans 2 days
Depart: Mon Oct 24 2016 Return: Fri Oct 28 2016 Trip spans 5 days
Depart: Fri Sep 23 2016 Return: Sat Sep 24 2016 Trip spans 2 days
Depart: Sat Oct 29 2016 Return: Wed Nov 2 2016 Trip spans 5 days
Depart: Sat Sep 24 2016 Return: Sun Sep 25 2016 Trip spans 2 days
Depart: Fri Dec 2 2016 Return: Sat Dec 3 2016 Trip spans 2 days
Depart: Fri Sep 9 2016 Return: Tue Sep 13 2016 Trip spans 5 days
Depart: Sun Sep 25 2016 Return: Tue Sep 27 2016 Trip spans 3 days
Depart: Tue Sep 27 2016 Return: Mon Oct 3 2016 Trip spans 7 days
Depart: Wed Sep 28 2016 Return: Mon Oct 3 2016 Trip spans 6 days
Depart: Fri Dec 30 2016 Return: Wed Jan 4 2017 Trip spans 6 days
Depart: Sat Sep 10 2016 Return: Sat Sep 17 2016 Trip spans 8 days
Depart: Thu Sep 29 2016 Return: Sat Oct 1 2016 Trip spans 3 days
Depart: Tue Feb 7 2017 Return: Tue Feb 14 2017 Trip spans 8 days
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 8:29 am Sep 21 - Sep 27
9128 6:00 am 8:29 am Sep 19 - Sep 19
9128 6:00 am 8:29 am Sep 13 - Sep 23
9128 6:00 am 8:29 am Sep 29 - Oct 2
9128 6:00 am 8:40 am Oct 3 - Oct 11
9128 6:00 am 8:40 am Oct 6 - Oct 6
9128 6:00 am 8:29 am Sep 7 - Sep 17
9128 6:00 am 8:29 am Sep 1 - Sep 9
9128 6:00 am 8:30 am Sep 28 - Sep 30
9127 11:05 am 1:40 pm Oct 3 - Oct 8
9127 11:05 am 1:35 pm Sep 20 - Sep 20
9127 11:05 am 1:35 pm Sep 19 - Sep 26
9127 11:05 am 1:35 pm Sep 17 - Sep 17
9127 11:05 am 1:35 pm Sep 12 - Sep 15
9127 11:05 am 1:35 pm Sep 11 - Sep 18
9127 11:05 am 1:35 pm Sep 10 - Sep 14
9127 11:05 am 1:35 pm Sep 9 - Sep 16
9127 11:05 am 1:35 pm Sep 1 - Sep 8
9127 11:05 am 1:35 pm Aug 28 - Sep 6
9127 11:05 am 1:35 pm Sep 24 - Sep 24
9127 11:05 am 1:35 pm Sep 27 - Oct 2
9127 11:05 am 1:35 pm Oct 1 - Oct 1
9127 11:05 am 1:35 pm Sep 29 - Sep 30
* 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.

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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
$137
Destination

Seattle
$137
Airlines Airline reviews

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

Overall
8.4
Boarding
9.0
Crew
8.7
Comfort
7.9
Food
7.3
Entertainment
6.5