Find Deals on Flights from Washington Dulles Intl to Ontario (IAD - ONT)

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 Washington Dulles Intl to Ontario

(Round-trip)
Depart: Wed Sep 28 2016 Return: Tue Oct 4 2016 Trip spans 7 days
Major Airline
Major Airline
IAD
9:35a
ONT
5:59p
8h 24m
1 stop
ONT
4:30a
IAD
2:02p
9h 32m
1 stop
Depart: Mon Aug 29 2016 Return: Wed Sep 7 2016 Trip spans 10 days
American Airlines
American Airlines
IAD
2:35p
ONT
10:08p
7h 33m
1 stop
ONT
8:59p
IAD
4:21a
7h 22m
1 stop
Depart: Tue May 17 2016 Return: Wed May 18 2016 Trip spans 2 days
United
United
IAD
4:20a
ONT
3:30p
11h 10m
1 stop
ONT
3:50p
IAD
12:02a
8h 12m
1 stop
Depart: Tue May 31 2016 Return: Tue Jun 7 2016 Trip spans 8 days
Major Airline
Major Airline
IAD
10:12p
ONT
6:21a
8h 09m
1 stop
ONT
11:46a
IAD
7:22p
7h 36m
1 stop
Depart: Sat Sep 17 2016 Return: Fri Sep 23 2016 Trip spans 7 days
American Airlines
American Airlines
IAD
2:35p
ONT
10:08p
7h 33m
1 stop
ONT
8:59p
IAD
4:21a
7h 22m
1 stop
Depart: Wed May 18 2016 Return: Mon May 23 2016 Trip spans 6 days
United
United
IAD
4:20a
ONT
3:30p
11h 10m
1 stop
ONT
11:26a
IAD
7:28p
8h 02m
1 stop
Depart: Wed Jun 1 2016 Return: Tue Jun 7 2016 Trip spans 7 days
Major Airline
Major Airline
IAD
10:12p
ONT
6:21a
8h 09m
1 stop
ONT
4:00a
IAD
1:06p
9h 06m
1 stop
Depart: Wed May 11 2016 Return: Fri May 13 2016 Trip spans 3 days
American Airlines
American Airlines
IAD
2:30p
ONT
10:27p
7h 57m
1 stop
ONT
9:05p
IAD
3:51a
6h 46m
1 stop
Depart: Thu May 19 2016 Return: Tue May 24 2016 Trip spans 6 days
United
United
IAD
4:54a
ONT
3:30p
10h 36m
1 stop
ONT
3:46p
IAD
11:30p
7h 44m
1 stop
Depart: Fri May 20 2016 Return: Tue May 31 2016 Trip spans 12 days
United
United
IAD
7:39a
ONT
6:16p
10h 37m
1 stop
ONT
4:46p
IAD
12:39a
7h 53m
1 stop
Depart: Tue Aug 30 2016 Return: Tue Sep 6 2016 Trip spans 8 days
American Airlines
American Airlines
IAD
2:35p
ONT
10:08p
7h 33m
1 stop
ONT
8:59p
IAD
4:21a
7h 22m
1 stop
Depart: Sat May 21 2016 Return: Tue May 31 2016 Trip spans 11 days
United
United
IAD
10:52a
ONT
7:16p
8h 24m
1 stop
ONT
4:46p
IAD
12:39a
7h 53m
1 stop
Depart: Tue Sep 13 2016 Return: Sat Sep 17 2016 Trip spans 5 days
American Airlines
American Airlines
IAD
2:35p
ONT
10:08p
7h 33m
1 stop
ONT
8:59p
IAD
4:21a
7h 22m
1 stop
Depart: Wed Jun 29 2016 Return: Fri Jul 8 2016 Trip spans 10 days
Major Airline
Major Airline
IAD
4:30a
ONT
12:35p
8h 05m
1 stop
ONT
1:12p
IAD
8:43p
7h 31m
1 stop
Depart: Wed May 25 2016 Return: Tue May 31 2016 Trip spans 7 days
United
United
IAD
2:12a
ONT
10:21a
8h 09m
1 stop
ONT
4:46p
IAD
12:39a
7h 53m
1 stop
Depart: Wed Sep 14 2016 Return: Fri Sep 16 2016 Trip spans 3 days
American Airlines
American Airlines
IAD
2:35p
ONT
10:08p
7h 33m
1 stop
ONT
8:59p
IAD
4:21a
7h 22m
1 stop
Depart: Sat May 28 2016 Return: Tue May 31 2016 Trip spans 4 days
United
United
IAD
4:50a
ONT
3:30p
10h 40m
1 stop
ONT
4:46p
IAD
12:39a
7h 53m
1 stop
Depart: Wed Sep 21 2016 Return: Fri Sep 23 2016 Trip spans 3 days
American Airlines
American Airlines
IAD
2:35p
ONT
10:08p
7h 33m
1 stop
ONT
8:59p
IAD
4:21a
7h 22m
1 stop
Depart: Sun Jun 19 2016 Return: Fri Jun 24 2016 Trip spans 6 days
Major Airline
Major Airline
IAD
10:40p
ONT
7:53a
9h 13m
1 stop
ONT
9:45p
IAD
4:23a
6h 38m
1 stop
Depart: Thu Jun 2 2016 Return: Mon Jun 6 2016 Trip spans 5 days
United
United
IAD
2:12a
ONT
10:21a
8h 09m
1 stop
ONT
3:46p
IAD
12:24a
8h 38m
1 stop
* 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

Washington
$254
Destination

Ontario
$254