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Cheap flights from Ontario to Washington, D.C. from $111

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 8/11. 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

Discover deals from 900+ travel sites with momondo.

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
8:17 am - 6:29 pm
ONT
-
IAD
7h 12m
1 stop
Frontier Logo
8:59 am - 3:54 pm
IAD
-
ONT
9h 55m
1 stop
$319Frontier
Fri, Aug 21 - Wed, Aug 26
Frontier Logo
3:40 pm - 8:20 am
ONT
-
IAD
13h 40m
1 stop
Frontier Logo
9:13 am - 3:54 pm
IAD
-
ONT
9h 41m
1 stop
$320Frontier
Fri, Jul 31 - Tue, Aug 18
Frontier Logo
6:00 am - 10:52 pm
ONT
-
IAD
13h 52m
2 stops
Frontier Logo
8:59 am - 4:22 pm
IAD
-
ONT
10h 23m
1 stop
$322Frontier
Thu, Aug 20 - Mon, Aug 24
Frontier Logo
1:38 pm - 8:20 am
ONT
-
IAD
15h 42m
1 stop
Frontier Logo
7:24 pm - 10:04 am
IAD
-
ONT
17h 40m
2 stops
$323Frontier
Wed, Aug 12 - Mon, Sep 7
Frontier Logo
9:36 am - 10:25 am
ONT
-
IAD
21h 49m
2 stops
Frontier Logo
9:30 am - 3:14 pm
IAD
-
ONT
8h 44m
1 stop
$324Frontier
Sun, Aug 9 - Sat, Aug 15
Frontier Logo
1:38 pm - 8:20 am
ONT
-
IAD
15h 42m
1 stop
Frontier Logo
9:30 am - 3:14 pm
IAD
-
ONT
8h 44m
1 stop
$332Frontier
Wed, Aug 12 - Sat, Aug 15
Frontier Logo
8:17 am - 6:29 pm
ONT
-
IAD
31h 12m
1 stop
Frontier Logo
8:59 am - 4:22 pm
IAD
-
ONT
10h 23m
1 stop
$334Frontier
Fri, Aug 21 - Mon, Aug 24
American Airlines Logo
7:05 am - 6:27 pm
ONT
-
IAD
8h 22m
1 stop
American Airlines Logo
6:09 am - 1:31 pm
IAD
-
ONT
10h 22m
1 stop
$335American Airlines
Wed, Aug 12 - Wed, Aug 19
Frontier Logo
3:40 pm - 8:04 am
ONT
-
IAD
13h 24m
1 stop
Frontier Logo
8:59 am - 8:03 am
IAD
-
ONT
26h 04m
1 stop
$336Frontier
Mon, Aug 24 - Fri, Aug 28
American Airlines Logo
7:05 am - 6:27 pm
ONT
-
IAD
8h 22m
1 stop
American Airlines Logo
6:09 am - 1:31 pm
IAD
-
ONT
10h 22m
1 stop
$339American Airlines
Wed, Aug 12 - Wed, Aug 19

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

Our best Delta deals on Ontario to Washington, D.C. Dulles Intl Airport flight tickets
Delta
Jul 22
ONT10:00 pmOntario
8h 26m
1 stop
IAD9:26 amWashington, D.C. Dulles Intl
Aug 20
IAD3:03 pmWashington, D.C. Dulles Intl
9h 49m
1 stop
ONT9:52 pmOntario
$340
Delta
Sep 16
ONT12:17 pmOntario
9h 23m
1 stop
IAD12:40 amWashington, D.C. Dulles Intl
Sep 18
IAD3:15 pmWashington, D.C. Dulles Intl
10h 11m
1 stop
ONT10:26 pmOntario
$355
Delta
Sep 16
ONT12:17 pmOntario
9h 23m
1 stop
IAD12:40 amWashington, D.C. Dulles Intl
Sep 18
IAD3:15 pmWashington, D.C. Dulles Intl
10h 11m
1 stop
ONT10:26 pmOntario
$356

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
Aug 12
ONT7:05 amOntario
8h 22m
1 stop
IAD6:27 pmWashington, D.C. Dulles Intl
Aug 19
IAD6:09 amWashington, D.C. Dulles Intl
10h 22m
1 stop
ONT1:31 pmOntario
$335
American Airlines
Aug 12
ONT7:05 amOntario
8h 22m
1 stop
IAD6:27 pmWashington, D.C. Dulles Intl
Aug 19
IAD6:09 amWashington, D.C. Dulles Intl
10h 22m
1 stop
ONT1:31 pmOntario
$339
American Airlines
Nov 11
ONT12:46 pmOntario
6h 46m
1 stop
IAD10:32 pmWashington, D.C. Dulles Intl
Nov 15
IAD6:04 amWashington, D.C. Dulles Intl
11h 00m
1 stop
ONT2:04 pmOntario
$365

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 July 3, 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
Quickest round-trip

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Fri 8/21

8:17 am-6:29 pm

1 stop7h 12m

Washington, D.C. Dulles Intl

Wed 8/26

8:59 am-3:54 pm

1 stop9h 55m

$319

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Fri 7/31

3:40 pm-8:20 am

1 stop13h 40m

Washington, D.C. Dulles Intl

Tue 8/18

9:13 am-3:54 pm

1 stop9h 41m

$320

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Thu 8/20

6:00 am-10:52 pm

2 stops13h 52m

Washington, D.C. Dulles Intl

Mon 8/24

8:59 am-4:22 pm

1 stop10h 23m

$322

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Wed 8/12

1:38 pm-8:20 am

1 stop15h 42m

Washington, D.C. Dulles Intl

Mon 9/7

7:24 pm-10:04 am

2 stops17h 40m

$323

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Sun 8/9

9:36 am-10:25 am

2 stops21h 49m

Washington, D.C. Dulles Intl

Sat 8/15

9:30 am-3:14 pm

1 stop8h 44m

$324

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Wed 8/12

1:38 pm-8:20 am

1 stop15h 42m

Washington, D.C. Dulles Intl

Sat 8/15

9:30 am-3:14 pm

1 stop8h 44m

$332

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Fri 8/21

8:17 am-6:29 pm

1 stop31h 12m

Washington, D.C. Dulles Intl

Mon 8/24

8:59 am-4:22 pm

1 stop10h 23m

$334

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Wed 8/12

7:05 am-6:27 pm

1 stop8h 22m

Washington, D.C. Dulles Intl

Wed 8/19

6:09 am-1:31 pm

1 stop10h 22m

$335

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Mon 8/24

3:40 pm-8:04 am

1 stop13h 24m

Washington, D.C. Dulles Intl

Fri 8/28

8:59 am-8:03 am

1 stop26h 04m

$336

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Wed 8/12

7:05 am-6:27 pm

1 stop8h 22m

Washington, D.C. Dulles Intl

Wed 8/19

6:09 am-1:31 pm

1 stop10h 22m

$339

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, September 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 $256. If you aren’t able to travel to Washington, D.C. Dulles Intl Airport during the month of September, then flying in July is also cheap. Prices for this month can be found on momondo for an average of $410.

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

Our data shows that Wednesday 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 $458. 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 $631.

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 $428 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 $578 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 20% 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 July 2026, prices for Ontario to Washington, D.C. Dulles Intl Airport flights are approximately 39% cheaper 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 18m

Direct flights

None
The fastest flight from Ontario to Washington, D.C. Dulles Intl Airport takes 7h 18m
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

Frequently asked questions about flying from Ontario to Washington, D.C. Dulles Intl Airport

  • 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 18m 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
7.8
8,453 reviews
Search Delta flights
FrontierPriceFrom $187Free CancellationRating
5.6
2,847 reviews
Search Frontier flights
American AirlinesPriceFrom $256Free CancellationRating
7.1
11,764 reviews
Search American Airlines flights
SouthwestPriceFrom $298Free CancellationRating
7.9
4,250 reviews
Search Southwest flights
United AirlinesPriceFrom $314Free CancellationRating
7.4
9,927 reviews
Search United Airlines 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
Arlington
Gettysburg
Winchester
Waldorf
Laurel
Woodbridge
Fredericksburg
Gaithersburg
Linthicum Heights
Rockville
Colonial Beach
Towson
Manassas
Silver Spring
Sterling
Tysons
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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