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: Fri Apr 28 2017 Return: Mon May 1 2017 Trip spans 4 days
Major Airline
Major Airline
IAD
9:30a
ONT
4:52a
19h 22m
2 stops
ONT
9:30a
IAD
5:19a
19h 49m
2 stops
Depart: Sat Mar 11 2017 Return: Tue Mar 14 2017 Trip spans 3 days
United
United
IAD
12:20p
ONT
10:06p
9h 46m
1 stop
ONT
1:35a
IAD
11:03a
9h 28m
1 stop
Depart: Mon Mar 27 2017 Return: Mon Apr 3 2017 Trip spans 8 days
American Airlines
American Airlines
IAD
10:54a
ONT
7:13p
8h 19m
1 stop
ONT
9:15p
IAD
3:58a
6h 43m
1 stop
Depart: Wed Aug 9 2017 Return: Mon Aug 14 2017 Trip spans 6 days
Delta
Delta
IAD
8:15a
ONT
9:39p
13h 24m
2 stops
ONT
6:20a
IAD
4:08p
9h 48m
1 stop
Depart: Thu Mar 9 2017 Return: Mon Mar 13 2017 Trip spans 4 days
Major Airline
Major Airline
IAD
1:00a
ONT
8:28a
7h 28m
nonstop
ONT
2:00a
IAD
3:28a
1h 28m
nonstop
Depart: Tue Mar 14 2017 Return: Wed Mar 15 2017 Trip spans 2 days
United
United
IAD
12:15p
ONT
7:14p
6h 59m
1 stop
ONT
9:30a
IAD
3:53p
6h 23m
1 stop
Depart: Mon Mar 20 2017 Return: Thu Mar 23 2017 Trip spans 4 days
Major Airline
Major Airline
IAD
9:30a
ONT
4:52a
19h 22m
2 stops
ONT
3:45a
IAD
5:15a
25h 30m
2 stops
Depart: Wed Mar 15 2017 Return: Wed Mar 22 2017 Trip spans 8 days
United
United
IAD
2:35a
ONT
10:51a
8h 16m
1 stop
ONT
9:30a
IAD
3:52p
6h 22m
1 stop
Depart: Wed May 17 2017 Return: Mon May 22 2017 Trip spans 6 days
American Airlines
American Airlines
IAD
3:17a
ONT
12:38p
9h 21m
1 stop
ONT
9:15p
IAD
3:58a
6h 43m
1 stop
Depart: Wed Apr 12 2017 Return: Sat Apr 15 2017 Trip spans 4 days
Major Airline
Major Airline
IAD
9:30a
ONT
5:14p
31h 44m
1 stop
ONT
10:20p
IAD
5:19a
30h 59m
1 stop
Depart: Wed Mar 29 2017 Return: Tue Apr 4 2017 Trip spans 7 days
United
United
IAD
12:15p
ONT
7:14p
6h 59m
1 stop
ONT
9:25a
IAD
3:57p
6h 32m
1 stop
Depart: Tue Mar 21 2017 Return: Wed Mar 22 2017 Trip spans 2 days
American Airlines
American Airlines
IAD
3:14a
ONT
12:36p
9h 22m
1 stop
ONT
6:49a
IAD
3:18p
8h 29m
1 stop
Depart: Tue Apr 11 2017 Return: Wed Apr 19 2017 Trip spans 9 days
United
United
IAD
6:10a
ONT
3:21p
9h 11m
1 stop
ONT
6:45a
IAD
2:07p
7h 22m
1 stop
Depart: Sat Apr 15 2017 Return: Sat Apr 22 2017 Trip spans 8 days
United
United
IAD
8:35a
ONT
7:31p
10h 56m
1 stop
ONT
12:55p
IAD
10:37p
9h 42m
1 stop
Depart: Sat Apr 22 2017 Return: Wed Apr 26 2017 Trip spans 5 days
United
United
IAD
4:53a
ONT
3:21p
10h 28m
1 stop
ONT
9:35a
IAD
3:57p
6h 22m
1 stop
Depart: Tue Feb 28 2017 Return: Mon Mar 13 2017 Trip spans 13 days
American Airlines
American Airlines
IAD
9:54a
ONT
6:13p
8h 19m
1 stop
ONT
9:15p
IAD
3:47a
6h 32m
1 stop
Depart: Tue Apr 25 2017 Return: Sat Apr 29 2017 Trip spans 5 days
United
United
IAD
10:20a
ONT
7:11p
8h 51m
1 stop
ONT
5:05p
IAD
12:20a
7h 15m
1 stop
Depart: Sun Mar 19 2017 Return: Wed Mar 22 2017 Trip spans 4 days
American Airlines
American Airlines
IAD
1:45p
ONT
11:27p
9h 42m
2 stops
ONT
3:35p
IAD
1:45a
10h 10m
2 stops
Depart: Thu Jul 20 2017 Return: Wed Jul 26 2017 Trip spans 7 days
Major Airline
Major Airline
IAD
9:20a
ONT
11:16a
25h 56m
2 stops
ONT
9:15a
IAD
5:12a
19h 57m
2 stops
Depart: Wed Apr 26 2017 Return: Wed May 3 2017 Trip spans 8 days
United
United
IAD
5:30a
ONT
3:21p
9h 51m
1 stop
ONT
5:05p
IAD
12:27a
7h 22m
1 stop
* 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.

We compile tonnes 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 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

Washington
$314
Destination

Ontario
$314