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Cheap flights from Ontario to Washington, D.C. from $70

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 1/22. 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
0 bags

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Cheap round-trip flights

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Frontier Logo
8:34 am - 11:59 amONT-IAD
24h 25m1 stop
Frontier Logo
8:47 am - 11:50 pmIAD-ONT
42h 03m2 stops
$242Frontier
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Fri, Oct 24 - Tue, Oct 28
Multiple Airlines Logo
4:17 pm - 9:09 amONT-IAD
13h 52m1 stop
Multiple Airlines Logo
7:43 am - 3:17 pmIAD-ONT
10h 34m1 stop
$286Multiple Airlines
Find Deal
Thu, Oct 23 - Tue, Oct 28
Delta Logo
1:20 pm - 11:58 pmONT-IAD
7h 38m1 stop
Delta Logo
7:10 am - 12:18 pmIAD-ONT
8h 08m1 stop
$305Delta
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Fri, Nov 14 - Mon, Nov 17
American Airlines Logo
11:55 pm - 4:05 pmONT-IAD
13h 10m1 stop
American Airlines Logo
5:15 pm - 9:57 pmIAD-ONT
7h 42m1 stop
$312American Airlines
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Sat, Feb 14 - Tue, Feb 17
United Airlines Logo
6:00 am - 4:27 pmONT-IAD
7h 27m1 stop
United Airlines Logo
4:10 pm - 10:51 pmIAD-ONT
9h 41m1 stop
$314United Airlines
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Fri, Oct 31 - Mon, Nov 3
American Airlines Logo
6:27 am - 9:17 pmONT-IAD
11h 50m2 stops
American Airlines Logo
6:32 am - 5:51 pmIAD-ONT
14h 19m1 stop
$317American Airlines
Find Deal
Wed, Jan 28 - Sat, Feb 14
Delta Logo
11:36 am - 11:20 pmONT-IAD
8h 44m1 stop
Delta Logo
3:33 pm - 10:22 pmIAD-ONT
9h 49m1 stop
$319Delta
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Thu, Oct 30 - Tue, Nov 4
Southwest Logo
6:10 am - 10:00 pmONT-IAD
12h 50m2 stops
Southwest Logo
7:40 am - 6:15 pmIAD-ONT
13h 35m2 stops
$358Southwest
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Wed, Nov 5 - Wed, Nov 12
United Airlines Logo
1:29 pm - 11:15 pmONT-IAD
6h 46m1 stop
United Airlines Logo
4:10 pm - 10:51 pmIAD-ONT
9h 41m1 stop
$363United Airlines
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Fri, Nov 7 - Mon, Nov 10
Southwest Logo
5:55 am - 4:50 pmONT-IAD
7h 55m1 stop
Southwest Logo
5:30 am - 4:05 pmIAD-ONT
13h 35m2 stops
$387Southwest
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Wed, Jan 14 - Thu, Jan 15

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
Nov 14
ONT1:20 pmOntario
7h 38m
1 stop
IAD11:58 pmWashington, D.C. Dulles Intl
Nov 17
IAD7:10 amWashington, D.C. Dulles Intl
8h 08m
1 stop
ONT12:18 pmOntario
$305
Find similar
Delta
Oct 30
ONT11:36 amOntario
8h 44m
1 stop
IAD11:20 pmWashington, D.C. Dulles Intl
Nov 4
IAD3:33 pmWashington, D.C. Dulles Intl
9h 49m
1 stop
ONT10:22 pmOntario
$319
Find similar
Delta
Nov 10
ONT4:49 pmOntario
13h 21m
2 stops
IAD9:10 amWashington, D.C. Dulles Intl
Nov 13
IAD6:00 amWashington, D.C. Dulles Intl
8h 06m
1 stop
ONT11:06 amOntario
$324
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Alaska Airlines flights from Ontario to Washington, D.C. Dulles Intl Airport

Our best Alaska Airlines deals on Ontario to Washington, D.C. Dulles Intl Airport flight tickets
Alaska Airlines
Oct 29
ONT4:11 pmOntario
11h 12m
1 stop
IAD6:23 amWashington, D.C. Dulles Intl
Nov 5
IAD7:43 amWashington, D.C. Dulles Intl
10h 34m
1 stop
ONT3:17 pmOntario
$298
Find similar
Alaska Airlines
Nov 8
ONT4:11 pmOntario
11h 12m
1 stop
IAD6:23 amWashington, D.C. Dulles Intl
Nov 15
IAD7:43 amWashington, D.C. Dulles Intl
10h 34m
1 stop
ONT3:17 pmOntario
$299
Find similar
Alaska Airlines
Nov 8
ONT4:11 pmOntario
11h 12m
1 stop
IAD6:23 amWashington, D.C. Dulles Intl
Nov 12
IAD7:43 amWashington, D.C. Dulles Intl
10h 34m
1 stop
ONT3:17 pmOntario
$304
Find similar

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 October 9, 2025.
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

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Fri 10/24

8:34 am-11:59 am

1 stop24h 25m

Washington, D.C. Dulles Intl

Tue 10/28

8:47 am-11:50 pm

2 stops42h 03m

$242

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Thu 10/23

4:17 pm-9:09 am

1 stop13h 52m

Washington, D.C. Dulles Intl

Tue 10/28

7:43 am-3:17 pm

1 stop10h 34m

$286

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Fri 11/14

1:20 pm-11:58 pm

1 stop7h 38m

Washington, D.C. Dulles Intl

Mon 11/17

7:10 am-12:18 pm

1 stop8h 08m

$305

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Sat 2/14

11:55 pm-4:05 pm

1 stop13h 10m

Washington, D.C. Dulles Intl

Tue 2/17

5:15 pm-9:57 pm

1 stop7h 42m

$312

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Fri 10/31

6:00 am-4:27 pm

1 stop7h 27m

Washington, D.C. Dulles Intl

Mon 11/3

4:10 pm-10:51 pm

1 stop9h 41m

$314

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Wed 1/28

6:27 am-9:17 pm

2 stops11h 50m

Washington, D.C. Dulles Intl

Sat 2/14

6:32 am-5:51 pm

1 stop14h 19m

$317

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Thu 10/30

11:36 am-11:20 pm

1 stop8h 44m

Washington, D.C. Dulles Intl

Tue 11/4

3:33 pm-10:22 pm

1 stop9h 49m

$319

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Wed 11/5

6:10 am-10:00 pm

2 stops12h 50m

Washington, D.C. Dulles Intl

Wed 11/12

7:40 am-6:15 pm

2 stops13h 35m

$358

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Fri 11/7

1:29 pm-11:15 pm

1 stop6h 46m

Washington, D.C. Dulles Intl

Mon 11/10

4:10 pm-10:51 pm

1 stop9h 41m

$363

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Wed 1/14

5:55 am-4:50 pm

1 stop7h 55m

Washington, D.C. Dulles Intl

Thu 1/15

5:30 am-4:05 pm

2 stops13h 35m

$387

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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 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 $307. 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 $425. 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 $587.

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 $386 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 $519 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.

How far in advance should I book a flight to Washington, D.C. Dulles Intl Airport?

You are more likely to see cheaper flights to Washington, D.C. Dulles Intl Airport from Ontario when booking weeks ahead of your departure date. In general, you can expect to find flights to Washington, D.C. Dulles Intl Airport for around $444 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Washington, D.C. Dulles Intl Airport from Ontario for as low as $297 on momondo.

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

As of October 2025, prices for Ontario to Washington, D.C. Dulles Intl Airport flights are approximately 32% 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

Direct flights

None
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.
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  • 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. 6h 46m 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
FrontierPriceFrom $160Free CancellationRating
5.8
3,143 reviews
Search Frontier flights
American AirlinesPriceFrom $278Free CancellationRating
7.2
11,043 reviews
Search American Airlines flights
United AirlinesPriceFrom $292Free CancellationRating
7.4
8,968 reviews
Search United Airlines flights
SouthwestPriceFrom $318Free CancellationRating
8.0
4,237 reviews
Search Southwest flights
DeltaPriceFrom $326Free CancellationRating
7.9
7,969 reviews
Search Delta 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
Gettysburg
National Harbor
Arlington
Winchester
Woodbridge
Waldorf
Tysons
Laurel
Colonial Beach
Silver Spring
Fredericksburg
Harpers Ferry
Towson
Rockville
Manassas
Fairfax
Reston
Gaithersburg
Glen Burnie

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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