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Cheap flights from Ontario to Washington, D.C. from $80

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Ontario to Washington, D.C. departing on 4/23. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

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Find the cheapest flights from Ontario to Washington, D.C.

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
7:40 pm - 10:03 am
ONT
-
IAD
11h 23m
1 stop
Frontier Logo
12:36 pm - 7:11 pm
IAD
-
ONT
9h 35m
1 stop
$205Frontier
Sat, Apr 4 - Thu, May 7
Frontier Logo
6:15 am - 6:12 pm
ONT
-
IAD
8h 57m
1 stop
Frontier Logo
1:31 pm - 7:11 pm
IAD
-
ONT
8h 40m
1 stop
$210Frontier
Thu, Apr 16 - Mon, May 11
Frontier Logo
3:30 pm - 8:12 am
ONT
-
IAD
13h 42m
1 stop
Frontier Logo
9:12 am - 3:44 pm
IAD
-
ONT
9h 32m
1 stop
$215Frontier
Thu, May 28 - Tue, Jun 2
Frontier Logo
3:30 pm - 8:12 am
ONT
-
IAD
13h 42m
1 stop
Frontier Logo
1:31 pm - 7:11 pm
IAD
-
ONT
8h 40m
1 stop
$220Frontier
Thu, Jun 4 - Mon, Jun 8
Frontier Logo
4:39 pm - 8:12 am
ONT
-
IAD
12h 33m
1 stop
Frontier Logo
9:12 am - 3:09 pm
IAD
-
ONT
8h 57m
1 stop
$222Frontier
Wed, May 20 - Mon, Jun 1
Frontier Logo
11:51 am - 8:12 am
ONT
-
IAD
17h 21m
1 stop
Frontier Logo
9:12 am - 3:44 pm
IAD
-
ONT
9h 32m
1 stop
$225Frontier
Thu, May 21 - Tue, May 26
Frontier Logo
4:39 pm - 8:12 am
ONT
-
IAD
12h 33m
1 stop
Frontier Logo
1:31 pm - 7:11 pm
IAD
-
ONT
8h 40m
1 stop
$230Frontier
Wed, May 20 - Mon, May 25
Frontier Logo
11:51 am - 8:12 am
ONT
-
IAD
17h 21m
1 stop
Frontier Logo
9:12 am - 3:44 pm
IAD
-
ONT
9h 32m
1 stop
$232Frontier
Thu, May 21 - Tue, May 26
Frontier Logo
3:30 pm - 8:12 am
ONT
-
IAD
13h 42m
1 stop
Frontier Logo
9:12 am - 3:09 pm
IAD
-
ONT
8h 57m
1 stop
$235Frontier
Thu, May 28 - Sun, May 31
Frontier Logo
1:50 pm - 8:12 am
ONT
-
IAD
15h 22m
1 stop
Frontier Logo
9:12 am - 7:32 pm
IAD
-
ONT
13h 20m
1 stop
$250Frontier
Wed, May 20 - Sat, May 23

Frontier flights from Ontario to Washington, D.C. Dulles Intl Airport

Our best Frontier deals on Ontario to Washington, D.C. Dulles Intl Airport flight tickets
Frontier
May 20
ONT4:39 pmOntario
12h 33m
1 stop
IAD8:12 amWashington, D.C. Dulles Intl
May 26
IAD9:12 amWashington, D.C. Dulles Intl
9h 32m
1 stop
ONT3:44 pmOntario
$205
Frontier
Apr 16
ONT6:15 amOntario
8h 57m
1 stop
IAD6:12 pmWashington, D.C. Dulles Intl
May 11
IAD1:31 pmWashington, D.C. Dulles Intl
8h 40m
1 stop
ONT7:11 pmOntario
$210
Frontier
May 26
ONT4:39 pmOntario
12h 33m
1 stop
IAD8:12 amWashington, D.C. Dulles Intl
May 28
IAD9:12 amWashington, D.C. Dulles Intl
8h 57m
1 stop
ONT3:09 pmOntario
$215

American Airlines flights from Ontario to Washington, D.C. Dulles Intl Airport

Our best American Airlines deals on Ontario to Washington, D.C. Dulles Intl Airport flight tickets
American Airlines
Apr 16
ONT7:35 pmOntario
10h 14m
2 stops
IAD8:49 amWashington, D.C. Dulles Intl
Apr 21
IAD5:59 pmWashington, D.C. Dulles Intl
7h 37m
1 stop
ONT10:36 pmOntario
$340
American Airlines
Apr 16
ONT7:35 pmOntario
10h 14m
2 stops
IAD8:49 amWashington, D.C. Dulles Intl
Apr 21
IAD7:16 amWashington, D.C. Dulles Intl
12h 06m
2 stops
ONT4:22 pmOntario
$345
American Airlines
Apr 15
ONT10:26 pmOntario
7h 23m
1 stop
IAD8:49 amWashington, D.C. Dulles Intl
Apr 21
IAD7:00 amWashington, D.C. Dulles Intl
14h 24m
2 stops
ONT6:24 pmOntario
$356

momondo Fare Finder

 
Customize your flight search to find flights from Ontario to Washington, D.C. Dulles Intl Airport that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated March 26, 2026.
Use the filters below to find and compare flights from Ontario to Washington, D.C. Dulles Intl Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Sat 4/4

7:40 pm-10:03 am

1 stop11h 23m

Washington, D.C. Dulles Intl

Thu 5/7

12:36 pm-7:11 pm

1 stop9h 35m

$205
Quickest round-trip

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Thu 4/16

6:15 am-6:12 pm

1 stop8h 57m

Washington, D.C. Dulles Intl

Mon 5/11

1:31 pm-7:11 pm

1 stop8h 40m

$210

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Thu 5/28

3:30 pm-8:12 am

1 stop13h 42m

Washington, D.C. Dulles Intl

Tue 6/2

9:12 am-3:44 pm

1 stop9h 32m

$215

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Thu 6/4

3:30 pm-8:12 am

1 stop13h 42m

Washington, D.C. Dulles Intl

Mon 6/8

1:31 pm-7:11 pm

1 stop8h 40m

$220

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Wed 5/20

4:39 pm-8:12 am

1 stop12h 33m

Washington, D.C. Dulles Intl

Mon 6/1

9:12 am-3:09 pm

1 stop8h 57m

$222

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Thu 5/21

11:51 am-8:12 am

1 stop17h 21m

Washington, D.C. Dulles Intl

Tue 5/26

9:12 am-3:44 pm

1 stop9h 32m

$225

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Wed 5/20

4:39 pm-8:12 am

1 stop12h 33m

Washington, D.C. Dulles Intl

Mon 5/25

1:31 pm-7:11 pm

1 stop8h 40m

$230

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Thu 5/21

11:51 am-8:12 am

1 stop17h 21m

Washington, D.C. Dulles Intl

Tue 5/26

9:12 am-3:44 pm

1 stop9h 32m

$232

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Thu 5/28

3:30 pm-8:12 am

1 stop13h 42m

Washington, D.C. Dulles Intl

Sun 5/31

9:12 am-3:09 pm

1 stop8h 57m

$235

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Wed 5/20

1:50 pm-8:12 am

1 stop15h 22m

Washington, D.C. Dulles Intl

Sat 5/23

9:12 am-7:32 pm

1 stop13h 20m

$250

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Washington, D.C. from

How to get the cheapest flight ticket from Ontario to Washington, D.C. Dulles Intl Airport

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the typical price of a round-trip flight between Ontario and Washington, D.C. Dulles Intl Airport?

What is the cheapest month to fly to Washington, D.C. Dulles Intl Airport?

In general, July is the cheapest month to fly from Ontario to Washington, D.C. Dulles Intl Airport. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $306. If you aren’t able to travel to Washington, D.C. Dulles Intl Airport during the month of July, then flying in August is also cheap. Prices for this month can be found on momondo for an average of $326.

What is the cheapest day to depart on your flight to Washington, D.C. Dulles Intl Airport?

Our data shows that Thursday is the least expensive day to fly to Washington, D.C. Dulles Intl Airport. Tickets to fly out on this day can be as low as $429. When flying out on a Sunday, the most expensive travel day of the week, you can expect to see flight prices from Ontario to Washington, D.C. Dulles Intl Airport for around $573.

What is the cheapest time of day to depart on your flight to Washington, D.C. Dulles Intl Airport?

Flying to Washington, D.C. Dulles Intl Airport from Ontario in the afternoon is the least expensive time of day to depart. momondo users have found prices as low as $396 when looking at flights departing in the afternoon. If you have a flexible travel schedule, then try to avoid flying at noon when prices are $568 on average. Flights to Washington, D.C. Dulles Intl Airport from Ontario at noon are generally more expensive because this time of day is more convenient for travelers’ schedules.

Can stopping save me money on Ontario to Washington, D.C. Dulles Intl Airport flights?

You could potentially save up to 10% on your flight if you consider stops on a Ontario to Washington, D.C. Dulles Intl Airport flight.

How have Ontario to Washington, D.C. Dulles Intl Airport flight prices changed over time?

As of March 2026, prices for Ontario to Washington, D.C. Dulles Intl Airport flights are approximately 147% more expensive when compared to flights at the same time last year.

When to book flights from Ontario to Washington, D.C. Dulles Intl Airport

Are you open to changing your travel dates? Check out the ideal times to fly from Ontario to Washington, D.C. Dulles Intl Airport according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Ontario to Washington, D.C. Dulles Intl Airport (ONT to IAD) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Ontario to Washington, D.C. Dulles Intl Airport

Fastest flight time

7h 19m

Direct flights

None
The fastest flight from Ontario to Washington, D.C. Dulles Intl Airport takes 7h 19m
There are no direct flights from Ontario to Washington, D.C. Dulles Intl Airport. There are no popular flight routes from Ontario to Washington, D.C. Dulles Intl Airport.
Search flight deals

  • How far is Ontario to Washington, D.C. Dulles Intl by plane?

    The distance between Ontario and Washington, D.C. Dulles Intl is about 2238.2 mi. 7h 19m is a normal flight duration for this route.

  • When did momondo last update prices for flights from Ontario Airport to Washington, D.C. Dulles Intl Airport?

    Prices for flights from Ontario Airport to Washington, D.C. Dulles Intl Airport are refreshed on a daily basis.

  • How many operators does momondo search for flights from Ontario Airport to Washington, D.C. Dulles Intl Airport?

  • How old do you have to be to fly from Ontario Airport to Washington, D.C. Dulles Intl Airport?

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Ontario Airport to Washington, D.C. Dulles Intl Airport.

  • What documentation or ID do you need to fly to Washington, D.C. Dulles Intl Airport?

    The necessary travel and health documents for your Washington, D.C. Dulles Intl Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

  • What is the most popular airline from Ontario to Washington, D.C. Dulles Intl Airport?

Best airlines flying from Ontario to Washington, D.C. Dulles Intl Airport

Compare and see reviews for airlines that fly from Ontario to Washington, D.C. Dulles Intl Airport with momondo
Airline
Rating
Free Cancellation
Price
DeltaPriceFrom $172Free CancellationRating
7.9
8,331 reviews
Search Delta flights
FrontierPriceFrom $187Free CancellationRating
5.7
3,015 reviews
Search Frontier flights
American AirlinesPriceFrom $256Free CancellationRating
7.1
11,495 reviews
Search American Airlines flights
United AirlinesPriceFrom $298Free CancellationRating
7.4
9,484 reviews
Search United Airlines flights
SouthwestPriceFrom $318Free CancellationRating
8.0
4,333 reviews
Search Southwest flights

Traveling to a place near Washington, D.C.?

Book flights to Washington, D.C. if you plan to visit one of these locations
Alexandria
National Harbor
Gettysburg
Arlington
Winchester
Waldorf
Woodbridge
Laurel
Colonial Beach
Gaithersburg
Towson
Silver Spring
Fredericksburg
Rockville
Tysons
Manassas
Sterling
Linthicum Heights
Springfield
Bethesda

Why use momondo?

Why should I use momondo to find a flight deal from Ontario to Washington, D.C.?

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Ontario to Washington, D.C.. momondo saves you time and could save you money on your trip.

Can I find flights from Ontario to Washington, D.C. with flexible booking policies on momondo?

Yes. All flights to Washington, D.C. from Ontario on momondo can be compared and filtered by various policies on offer, including flexible booking.

How can momondo help me find flights from Ontario to Washington, D.C.?

momondo helps you find the best flight between Ontario and Washington, D.C. by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

I’m not ready to book a flight from Ontario to Washington, D.C. right now. Can momondo alert me if prices change?

Yes. momondo can track prices for Ontario to Washington, D.C. flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

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