Find Cheap Flights to Washington Dulles Intl

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 Ontario to Washington Dulles Intl

(Round-trip)
Depart: Tue Aug 29 2017 Return: Wed Aug 30 2017 Trip spans 2 days
United
United
ONT
3:40p
IAD
10:45p
7h 05m
1 stop
IAD
4:54a
ONT
3:20p
10h 26m
1 stop
Depart: Tue Sep 12 2017 Return: Wed Sep 13 2017 Trip spans 2 days
American Airlines
American Airlines
ONT
9:10p
IAD
4:00a
6h 50m
1 stop
IAD
9:45a
ONT
10:10p
12h 25m
2 stops
Depart: Sat Sep 23 2017 Return: Tue Sep 26 2017 Trip spans 4 days
Delta
Delta
ONT
2:00a
IAD
11:57a
9h 57m
2 stops
IAD
12:59p
ONT
10:12p
9h 13m
2 stops
Depart: Mon Sep 18 2017 Return: Tue Sep 19 2017 Trip spans 2 days
United
United
ONT
12:40p
IAD
10:27p
9h 47m
1 stop
IAD
4:20a
ONT
3:09p
10h 49m
1 stop
Depart: Fri Sep 15 2017 Return: Tue Sep 19 2017 Trip spans 5 days
American Airlines
American Airlines
ONT
9:10p
IAD
4:00a
6h 50m
1 stop
IAD
3:05p
ONT
10:10p
7h 05m
1 stop
Depart: Tue Sep 19 2017 Return: Wed Sep 20 2017 Trip spans 2 days
United
United
ONT
12:40p
IAD
10:27p
9h 47m
1 stop
IAD
4:20a
ONT
3:09p
10h 49m
1 stop
Depart: Mon Sep 25 2017 Return: Tue Oct 10 2017 Trip spans 16 days
American Airlines
American Airlines
ONT
9:10p
IAD
4:00a
6h 50m
1 stop
IAD
3:05p
ONT
10:10p
7h 05m
1 stop
Depart: Tue Aug 22 2017 Return: Thu Aug 24 2017 Trip spans 3 days
United
United
ONT
4:00a
IAD
12:16p
8h 16m
1 stop
IAD
12:30p
ONT
8:09p
7h 39m
1 stop
Depart: Mon Oct 9 2017 Return: Tue Oct 17 2017 Trip spans 9 days
American Airlines
American Airlines
ONT
9:10p
IAD
4:00a
6h 50m
1 stop
IAD
3:05p
ONT
10:10p
7h 05m
1 stop
Depart: Wed Aug 23 2017 Return: Sat Aug 26 2017 Trip spans 4 days
United
United
ONT
3:40p
IAD
12:53a
9h 13m
1 stop
IAD
12:30p
ONT
8:09p
7h 39m
1 stop
Depart: Tue Oct 10 2017 Return: Tue Oct 17 2017 Trip spans 8 days
American Airlines
American Airlines
ONT
9:10p
IAD
4:00a
6h 50m
1 stop
IAD
3:05p
ONT
10:10p
7h 05m
1 stop
Depart: Thu Aug 24 2017 Return: Sat Aug 26 2017 Trip spans 3 days
United
United
ONT
5:40p
IAD
12:53a
7h 13m
1 stop
IAD
12:30p
ONT
8:09p
7h 39m
1 stop
Depart: Fri Oct 13 2017 Return: Tue Oct 17 2017 Trip spans 5 days
American Airlines
American Airlines
ONT
9:10p
IAD
4:00a
6h 50m
1 stop
IAD
3:05p
ONT
10:10p
7h 05m
1 stop
Depart: Sat Aug 26 2017 Return: Mon Aug 28 2017 Trip spans 3 days
United
United
ONT
8:45a
IAD
5:45p
9h 00m
1 stop
IAD
8:55a
ONT
6:44p
9h 49m
1 stop
Depart: Wed Oct 25 2017 Return: Wed Nov 1 2017 Trip spans 8 days
American Airlines
American Airlines
ONT
9:10p
IAD
4:00a
6h 50m
1 stop
IAD
3:05p
ONT
10:10p
7h 05m
1 stop
Depart: Mon Aug 28 2017 Return: Wed Aug 30 2017 Trip spans 3 days
United
United
ONT
5:40p
IAD
12:53a
7h 13m
1 stop
IAD
12:17p
ONT
7:50p
7h 33m
1 stop
Depart: Fri Oct 27 2017 Return: Tue Oct 31 2017 Trip spans 5 days
American Airlines
American Airlines
ONT
9:10p
IAD
4:00a
6h 50m
1 stop
IAD
3:20a
ONT
12:26p
9h 06m
1 stop
Depart: Wed Aug 30 2017 Return: Sat Sep 2 2017 Trip spans 4 days
United
United
ONT
3:40p
IAD
10:45p
7h 05m
1 stop
IAD
8:30a
ONT
4:30p
8h 00m
1 stop
Depart: Mon Aug 7 2017 Return: Tue Aug 15 2017 Trip spans 9 days
American Airlines
American Airlines
ONT
9:10p
IAD
4:00a
6h 50m
1 stop
IAD
3:05p
ONT
10:06p
7h 01m
1 stop
Depart: Thu Aug 31 2017 Return: Tue Sep 5 2017 Trip spans 6 days
United
United
ONT
5:40p
IAD
12:53a
7h 13m
1 stop
IAD
1:15p
ONT
11:09p
9h 54m
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

Ontario
$334
Destination

Washington
$334