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Cheap flights from Ontario to Washington, D.C. from $59

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 1/8. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Cheap round-trip flights

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American Airlines Logo
6:00 am - 9:17 pmONT-IAD
12h 17m1 stop
American Airlines Logo
5:26 pm - 10:48 pmIAD-ONT
8h 22m1 stop
$250American Airlines
Find Deal
Thu, Jan 8 - Wed, Jan 14
Delta Logo
7:30 am - 11:06 pmONT-IAD
12h 36m2 stops
Delta Logo
7:30 am - 1:56 pmIAD-ONT
9h 26m1 stop
$252Delta
Find Deal
Tue, Jan 13 - Tue, Jan 20
Multiple Airlines Logo
8:02 am - 8:04 pmONT-IAD
9h 02m1 stop
Multiple Airlines Logo
6:04 pm - 10:59 amIAD-ONT
19h 55m1 stop
$255Multiple Airlines
Find Deal
Thu, Jan 15 - Thu, Jan 22
Delta Logo
12:41 pm - 11:37 pmONT-IAD
7h 56m1 stop
Delta Logo
6:20 am - 11:31 amIAD-ONT
8h 11m1 stop
$257Delta
Find Deal
Thu, Jan 8 - Wed, Jan 14
Delta Logo
10:30 pm - 10:55 amONT-IAD
9h 25m1 stop
Delta Logo
6:20 am - 11:31 amIAD-ONT
8h 11m1 stop
$258Delta
Find Deal
Thu, Jan 8 - Wed, Jan 14
Frontier Logo
6:20 am - 10:44 amONT-IAD
25h 24m2 stops
Frontier Logo
10:50 am - 4:26 pmIAD-ONT
8h 36m1 stop
$259Frontier
Find Deal
Fri, Jan 23 - Sun, Jan 25
American Airlines Logo
9:59 am - 11:12 pmONT-IAD
10h 13m2 stops
American Airlines Logo
1:08 pm - 10:13 pmIAD-ONT
12h 05m2 stops
$260American Airlines
Find Deal
Wed, Feb 4 - Fri, Feb 6
Delta Logo
10:30 pm - 1:35 pmONT-IAD
12h 05m2 stops
Delta Logo
7:30 am - 1:56 pmIAD-ONT
9h 26m1 stop
$262Delta
Find Deal
Tue, Jan 20 - Sat, Jan 24
United Airlines Logo
1:24 pm - 11:22 pmONT-IAD
6h 58m1 stop
United Airlines Logo
4:10 pm - 10:53 pmIAD-ONT
9h 43m1 stop
$263United Airlines
Find Deal
Mon, Jan 12 - Thu, Jan 15
Alaska Airlines Logo
4:03 pm - 4:26 pmONT-IAD
21h 23m1 stop
Alaska Airlines Logo
6:04 pm - 10:59 amIAD-ONT
19h 55m1 stop
$264Alaska Airlines
Find Deal
Tue, Jan 27 - Sat, Jan 31

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

Our best United Airlines deals on Ontario to Washington, D.C. Dulles Intl Airport flight tickets
United Airlines
Jan 12
ONT1:24 pmOntario
6h 58m
1 stop
IAD11:22 pmWashington, D.C. Dulles Intl
Jan 15
IAD4:10 pmWashington, D.C. Dulles Intl
9h 43m
1 stop
ONT10:53 pmOntario
$263
Find similar
United Airlines
Dec 30
ONT11:59 pmOntario
8h 46m
1 stop
IAD11:45 amWashington, D.C. Dulles Intl
Jan 6
IAD4:11 pmWashington, D.C. Dulles Intl
7h 47m
1 stop
ONT8:58 pmOntario
$335
Find similar
United Airlines
Dec 26
ONT6:39 pmOntario
9h 08m
1 stop
IAD6:47 amWashington, D.C. Dulles Intl
Jan 6
IAD4:11 pmWashington, D.C. Dulles Intl
7h 47m
1 stop
ONT8:58 pmOntario
$337
Find similar

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
Feb 6
ONT6:00 amOntario
31h 26m
1 stop
IAD4:26 pmWashington, D.C. Dulles Intl
Feb 9
IAD6:04 pmWashington, D.C. Dulles Intl
24h 04m
1 stop
ONT3:08 pmOntario
$264
Find similar
Alaska Airlines
Jan 8
ONT6:00 amOntario
31h 26m
1 stop
IAD4:26 pmWashington, D.C. Dulles Intl
Jan 12
IAD6:04 pmWashington, D.C. Dulles Intl
29h 32m
1 stop
ONT8:36 pmOntario
$284
Find similar
Alaska Airlines
Jan 21
ONT4:03 pmOntario
21h 23m
1 stop
IAD4:26 pmWashington, D.C. Dulles Intl
Jan 23
IAD6:04 pmWashington, D.C. Dulles Intl
24h 04m
1 stop
ONT3:08 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 December 3, 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

Thu 1/8

6:00 am-9:17 pm

1 stop12h 17m

Washington, D.C. Dulles Intl

Wed 1/14

5:26 pm-10:48 pm

1 stop8h 22m

$250

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Tue 1/13

7:30 am-11:06 pm

2 stops12h 36m

Washington, D.C. Dulles Intl

Tue 1/20

7:30 am-1:56 pm

1 stop9h 26m

$252

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Thu 1/15

8:02 am-8:04 pm

1 stop9h 02m

Washington, D.C. Dulles Intl

Thu 1/22

6:04 pm-10:59 am

1 stop19h 55m

$255

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Thu 1/8

12:41 pm-11:37 pm

1 stop7h 56m

Washington, D.C. Dulles Intl

Wed 1/14

6:20 am-11:31 am

1 stop8h 11m

$257

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Thu 1/8

10:30 pm-10:55 am

1 stop9h 25m

Washington, D.C. Dulles Intl

Wed 1/14

6:20 am-11:31 am

1 stop8h 11m

$258

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Fri 1/23

6:20 am-10:44 am

2 stops25h 24m

Washington, D.C. Dulles Intl

Sun 1/25

10:50 am-4:26 pm

1 stop8h 36m

$259

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Wed 2/4

9:59 am-11:12 pm

2 stops10h 13m

Washington, D.C. Dulles Intl

Fri 2/6

1:08 pm-10:13 pm

2 stops12h 05m

$260

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Tue 1/20

10:30 pm-1:35 pm

2 stops12h 05m

Washington, D.C. Dulles Intl

Sat 1/24

7:30 am-1:56 pm

1 stop9h 26m

$262

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Mon 1/12

1:24 pm-11:22 pm

1 stop6h 58m

Washington, D.C. Dulles Intl

Thu 1/15

4:10 pm-10:53 pm

1 stop9h 43m

$263

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Tue 1/27

4:03 pm-4:26 pm

1 stop21h 23m

Washington, D.C. Dulles Intl

Sat 1/31

6:04 pm-10:59 am

1 stop19h 55m

$264

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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 $421. 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 $568.

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 $383 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 $540 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 $455 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 December 2025, prices for Ontario to Washington, D.C. Dulles Intl Airport flights are approximately 20% 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

6h 20m

Direct flights

None
The fastest flight from Ontario to Washington, D.C. Dulles Intl Airport takes 6h 20m
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. 6h 34m 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 $187Free CancellationRating
5.8
3,094 reviews
Search Frontier flights
American AirlinesPriceFrom $278Free CancellationRating
7.2
11,045 reviews
Search American Airlines flights
United AirlinesPriceFrom $298Free CancellationRating
7.4
9,063 reviews
Search United Airlines flights
SouthwestPriceFrom $318Free CancellationRating
8.0
4,253 reviews
Search Southwest flights
DeltaPriceFrom $318Free CancellationRating
7.9
8,011 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
National Harbor
Gettysburg
Arlington
Winchester
Woodbridge
Waldorf
Tysons
Laurel
Colonial Beach
Silver Spring
Fredericksburg
Towson
Rockville
Harpers Ferry
Reston
Manassas
Gaithersburg
Sterling
Fairfax

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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