Which airport is the most popular layover for flights between Ontario and Washington, D.C. Dulles Intl Airport?

Phoenix (PHX) was the most common stop: 33% of momondo users choosing 1-stop flights on this route connected there.

What is the cheapest airline that flies from Ontario to Washington, D.C. Dulles Intl?

Alaska Airlines, Delta, and United Airlines are the most popular carriers operating from Ontario to Washington, D.C. Dulles Intl

Which layover airport offers the lowest fares from Ontario to Washington, D.C. Dulles Intl Airport?

Flights via Dallas (DFW) offer the lowest average round-trip price of $312.

What airlines fly to Washington, D.C. Dulles Intl Airport?

United Airlines, American Airlines and Frontier are the top three most popular airlines that fly to Washington, D.C. Dulles Intl Airport from Ontario according to our data. United Airlines is the first choice among our users, with 84% of people opting to fly with this airline when traveling to Washington, D.C. Dulles Intl Airport. Keep in mind that there are 7 different airlines that fly to Washington, D.C. Dulles Intl Airport on a routine basis, so you have a few additional options to choose from.

Which layover airport has the shortest travel time from Ontario to Washington, D.C. Dulles Intl Airport?

Flights connecting via Dallas (DFW) have the shortest average one-way travel time: 7h 06m.

Which layover airport has the shortest connection time from Ontario to Washington, D.C. Dulles Intl Airport?

Dallas (DFW) has the shortest average layover time for this route: 1h 24m.

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?

As of August 2026, there are 5 operators available to choose from 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.

$116 Cheap Flights from Ontario to Washington, D.C. Dulles Intl Airport in 2026

Discover deals from 900+ travel sites with momondo.

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

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

7:46 pm - 11:33 amONT Ontario-IAD Washington, D.C. Dulles Intl

12h 47m1 stop Dallas/Fort Worth

12:43 pm - 6:39 pmIAD Washington, D.C. Dulles Intl-ONT Ontario

8h 56m1 stop Dallas/Fort Worth

$257Frontier

Fri, Oct 2 - Mon, Oct 5

8:35 pm - 6:20 amONT Ontario-IAD Washington, D.C. Dulles Intl

6h 45m1 stop Las Vegas Harry Reid Intl

6:00 am - 11:16 amIAD Washington, D.C. Dulles Intl-ONT Ontario

8h 16m1 stop Las Vegas Harry Reid Intl

$257Frontier

Fri, Oct 9 - Mon, Oct 12

8:24 pm - 6:20 amONT Ontario-IAD Washington, D.C. Dulles Intl

6h 56m1 stop Las Vegas Harry Reid Intl

7:00 am - 2:16 pmIAD Washington, D.C. Dulles Intl-ONT Ontario

10h 16m1 stop Seattle/Tacoma Intl

$285Multiple Airlines

Thu, Sep 10 - Wed, Sep 16

3:14 pm - 5:40 amONT Ontario-IAD Washington, D.C. Dulles Intl

11h 26m1 stop Seattle/Tacoma Intl

6:00 am - 11:22 amIAD Washington, D.C. Dulles Intl-ONT Ontario

8h 22m1 stop Las Vegas Harry Reid Intl

$292Multiple Airlines

Wed, Sep 23 - Mon, Sep 28

6:45 am - 5:13 pmONT Ontario-IAD Washington, D.C. Dulles Intl

7h 28m1 stop Chicago O'Hare Intl

5:55 pm - 11:06 pmIAD Washington, D.C. Dulles Intl-ONT Ontario

8h 11m1 stop San Francisco

$351United Airlines

Thu, Jan 21 - Mon, Jan 25

7:00 am - 5:24 pmONT Ontario-IAD Washington, D.C. Dulles Intl

7h 24m1 stop Chicago O'Hare Intl

2:05 pm - 8:51 pmIAD Washington, D.C. Dulles Intl-ONT Ontario

9h 46m1 stop Denver Intl

$351United Airlines

Tue, Nov 3 - Mon, Nov 9

8:25 am - 8:24 pmONT Ontario-IAD Washington, D.C. Dulles Intl

8h 59m1 stop Dallas/Fort Worth

7:13 pm - 11:52 pmIAD Washington, D.C. Dulles Intl-ONT Ontario

7h 39m1 stop Dallas/Fort Worth

$351American Airlines

Tue, Sep 15 - Sat, Oct 10

8:25 am - 8:24 pmONT Ontario-IAD Washington, D.C. Dulles Intl

8h 59m1 stop Dallas/Fort Worth

6:52 am - 1:25 pmIAD Washington, D.C. Dulles Intl-ONT Ontario

9h 33m1 stop Dallas/Fort Worth

$351American Airlines

Tue, Sep 15 - Sat, Sep 26

1:25 pm - 11:37 pmONT Ontario-IAD Washington, D.C. Dulles Intl

7h 12m1 stop Salt Lake City

7:00 am - 11:27 amIAD Washington, D.C. Dulles Intl-ONT Ontario

7h 27m1 stop Atlanta Hartsfield-Jackson

$351Delta

Thu, Dec 10 - Mon, Jan 11

11:10 pm - 9:11 amONT Ontario-IAD Washington, D.C. Dulles Intl

7h 01m1 stop Atlanta Hartsfield-Jackson

7:00 am - 11:27 amIAD Washington, D.C. Dulles Intl-ONT Ontario

7h 27m1 stop Atlanta Hartsfield-Jackson

$351Delta

Thu, Dec 17 - Thu, Jan 7

Cheap last minute flights

Enter your travel dates to find the best prices.

3:40 pm - 8:04 amONT Ontario-IAD Washington, D.C. Dulles Intl

13h 24m1 stop Las Vegas Harry Reid Intl

6:00 am - 4:59 pmIAD Washington, D.C. Dulles Intl-ONT Ontario

13h 59m1 stop Las Vegas Harry Reid Intl

$346Frontier

Tue, Aug 25 - Tue, Sep 15

10:17 pm - 8:04 amONT Ontario-IAD Washington, D.C. Dulles Intl

6h 47m1 stop Las Vegas Harry Reid Intl

8:59 am - 9:09 amIAD Washington, D.C. Dulles Intl-ONT Ontario

27h 10m1 stop Las Vegas Harry Reid Intl

$348Frontier

Mon, Aug 24 - Tue, Sep 8

3:07 pm - 5:40 amONT Ontario-IAD Washington, D.C. Dulles Intl

11h 33m1 stop Seattle/Tacoma Intl

6:00 am - 11:22 amIAD Washington, D.C. Dulles Intl-ONT Ontario

8h 22m1 stop Las Vegas Harry Reid Intl

$415Multiple Airlines

Tue, Aug 25 - Thu, Sep 10

3:40 pm - 8:04 amONT Ontario-IAD Washington, D.C. Dulles Intl

13h 24m1 stop Las Vegas Harry Reid Intl

7:00 am - 2:09 pmIAD Washington, D.C. Dulles Intl-ONT Ontario

10h 09m1 stop Seattle/Tacoma Intl

$443Multiple Airlines

Tue, Aug 25 - Tue, Sep 1

1:06 pm - 11:39 pmONT Ontario-IAD Washington, D.C. Dulles Intl

7h 33m1 stop Salt Lake City

6:00 am - 11:05 amIAD Washington, D.C. Dulles Intl-ONT Ontario

8h 05m1 stop Atlanta Hartsfield-Jackson

$490Delta

Tue, Aug 25 - Wed, Sep 9

6:00 am - 6:27 pmONT Ontario-IAD Washington, D.C. Dulles Intl

9h 27m1 stop Dallas/Fort Worth

1:23 pm - 10:59 pmIAD Washington, D.C. Dulles Intl-ONT Ontario

12h 36m2 stops Charlotte Douglas Dallas/Fort Worth

$572American Airlines

Wed, Aug 26 - Sat, Aug 29

7:05 am - 10:55 pmONT Ontario-IAD Washington, D.C. Dulles Intl

12h 50m2 stops Dallas/Fort Worth Charlotte Douglas

6:09 am - 11:43 amIAD Washington, D.C. Dulles Intl-ONT Ontario

8h 34m1 stop Dallas/Fort Worth

$572American Airlines

Wed, Aug 26 - Sat, Aug 29

1:18 pm - 11:19 pmONT Ontario-IAD Washington, D.C. Dulles Intl

7h 01m1 stop Denver Intl

6:42 am - 12:12 pmIAD Washington, D.C. Dulles Intl-ONT Ontario

8h 30m1 stop San Francisco

$599United Airlines

Tue, Aug 25 - Sun, Sep 13

6:08 am - 4:18 pmONT Ontario-IAD Washington, D.C. Dulles Intl

7h 10m1 stop San Francisco

6:42 am - 12:12 pmIAD Washington, D.C. Dulles Intl-ONT Ontario

8h 30m1 stop San Francisco

$599United Airlines

Wed, Aug 26 - Sun, Sep 13

12:00 pm - 12:34 amONT Ontario-IAD Washington, D.C. Dulles Intl

9h 34m1 stop Atlanta Hartsfield-Jackson

6:00 am - 10:42 amIAD Washington, D.C. Dulles Intl-ONT Ontario

7h 42m1 stop Atlanta Hartsfield-Jackson

$655Delta

Sat, Aug 22 - Sun, Aug 23

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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

Sep 25

ONT7:46 pmOntario

12h 47m

1 stop

IAD11:33 amWashington, D.C. Dulles Intl

Sep 30

IAD6:00 amWashington, D.C. Dulles Intl

13h 59m

1 stop

ONT4:59 pmOntario

$257

Frontier

Sep 7

ONT10:17 pmOntario

27h 44m

1 stop

IAD5:01 amWashington, D.C. Dulles Intl

Oct 23

IAD12:30 pmWashington, D.C. Dulles Intl

9h 38m

1 stop

ONT7:08 pmOntario

$260

Frontier

Sep 10

ONT8:24 pmOntario

6h 56m

1 stop

IAD6:20 amWashington, D.C. Dulles Intl

Sep 16

IAD6:00 amWashington, D.C. Dulles Intl

28h 04m

1 stop

ONT7:04 amOntario

$261

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

Sep 2

ONT12:00 pmOntario

9h 34m

1 stop

IAD12:34 amWashington, D.C. Dulles Intl

Sep 9

IAD3:15 pmWashington, D.C. Dulles Intl

8h 09m

1 stop

ONT8:24 pmOntario

$369

Delta

Sep 1

ONT1:06 pmOntario

7h 33m

1 stop

IAD11:39 pmWashington, D.C. Dulles Intl

Sep 8

IAD3:15 pmWashington, D.C. Dulles Intl

8h 09m

1 stop

ONT8:24 pmOntario

$384

Delta

Sep 1

ONT1:06 pmOntario

7h 33m

1 stop

IAD11:39 pmWashington, D.C. Dulles Intl

Sep 6

IAD7:00 amWashington, D.C. Dulles Intl

8h 16m

1 stop

ONT12:16 pmOntario

$399

momondo Fare Finder

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 Ontario - IAD Washington, D.C. Dulles Intl

ONTIAD

Ontario

Fri 10/2

7:46 pm-11:33 am

1 stop12h 47m

Washington, D.C. Dulles Intl

Mon 10/5

12:43 pm-6:39 pm

1 stop8h 56m

$257

OntarioWashington, D.C.

ONT Ontario - IAD Washington, D.C. Dulles Intl

ONTIAD

Ontario

Fri 10/9

8:35 pm-6:20 am

1 stop6h 45m

Washington, D.C. Dulles Intl

Mon 10/12

6:00 am-11:16 am

1 stop8h 16m

$257

OntarioWashington, D.C.

ONT Ontario - IAD Washington, D.C. Dulles Intl

ONTIAD

Ontario

Thu 9/10

8:24 pm-6:20 am

1 stop6h 56m

Washington, D.C. Dulles Intl

Wed 9/16

7:00 am-2:16 pm

1 stop10h 16m

$285

OntarioWashington, D.C.

ONT Ontario - IAD Washington, D.C. Dulles Intl

ONTIAD

Ontario

Wed 9/23

3:14 pm-5:40 am

1 stop11h 26m

Washington, D.C. Dulles Intl

Mon 9/28

6:00 am-11:22 am

1 stop8h 22m

$292

OntarioWashington, D.C.

ONT Ontario - IAD Washington, D.C. Dulles Intl

ONTIAD

Ontario

Thu 1/21

6:45 am-5:13 pm

1 stop7h 28m

Washington, D.C. Dulles Intl

Mon 1/25

5:55 pm-11:06 pm

1 stop8h 11m

$351

OntarioWashington, D.C.

ONT Ontario - IAD Washington, D.C. Dulles Intl

ONTIAD

Ontario

Tue 11/3

7:00 am-5:24 pm

1 stop7h 24m

Washington, D.C. Dulles Intl

Mon 11/9

2:05 pm-8:51 pm

1 stop9h 46m

$351

OntarioWashington, D.C.

ONT Ontario - IAD Washington, D.C. Dulles Intl

ONTIAD

Ontario

Tue 9/15

8:25 am-8:24 pm

1 stop8h 59m

Washington, D.C. Dulles Intl

Sat 10/10

7:13 pm-11:52 pm

1 stop7h 39m

$351

OntarioWashington, D.C.

ONT Ontario - IAD Washington, D.C. Dulles Intl

ONTIAD

Ontario

Tue 9/15

8:25 am-8:24 pm

1 stop8h 59m

Washington, D.C. Dulles Intl

Sat 9/26

6:52 am-1:25 pm

1 stop9h 33m

$351

OntarioWashington, D.C.

ONT Ontario - IAD Washington, D.C. Dulles Intl

ONTIAD

Ontario

Thu 12/10

1:25 pm-11:37 pm

1 stop7h 12m

Washington, D.C. Dulles Intl

Mon 1/11

7:00 am-11:27 am

1 stop7h 27m

$351

Quickest round-trip

OntarioWashington, D.C.

ONT Ontario - IAD Washington, D.C. Dulles Intl

ONTIAD

Ontario

Thu 12/17

11:10 pm-9:11 am

1 stop7h 01m

Washington, D.C. Dulles Intl

Thu 1/7

7:00 am-11:27 am

1 stop7h 27m

$351

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

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

Prices

Airlines

Layovers

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

Prices are currently low for flights on this route.

Typical prices usually range from $338 to $533.
The lowest price recently found on this route was $257.

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 $284. If you aren’t able to travel to Washington, D.C. Dulles Intl Airport during the month of September, then flying in February is also cheap. Prices for this month can be found on momondo for an average of $448.

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 $463. 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 $642.

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 $430 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 $573 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 40% 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 August 2026, prices for Ontario to Washington, D.C. Dulles Intl Airport flights are approximately 100% 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

Best Price Found	$116
Fastest flight time	6h 45m
Direct flights	None

The best one-way flight to Washington, D.C. Dulles Intl Airport from Ontario in the past 72 hours is $116. The best round-trip flight deal from Ontario to Washington, D.C. Dulles Intl Airport found on momondo in the last 72 hours is $257.

The fastest flight from Ontario to Washington, D.C. Dulles Intl Airport takes 6h 45m

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. 6h 45m 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?
As of August 2026, there are 5 operators available to choose from 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?
Based on momondo bookings for this flight route, the most popular airline on flight routes from Ontario to Washington, D.C. Dulles Intl Airport is United Airlines (37% of total bookings). The next most popular airlines are American Airlines (23%), Southwest (19%), and Delta (13%).

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
Frontier	PriceFrom $105	Free Cancellation	Rating 5.6 2,658 reviews	Search Frontier flights
American Airlines	PriceFrom $256	Free Cancellation	Rating 7.1 11,988 reviews	Search American Airlines flights
United Airlines	PriceFrom $314	Free Cancellation	Rating 7.4 10,109 reviews	Search United Airlines flights
Southwest	PriceFrom $318	Free Cancellation	Rating 8.0 4,214 reviews	Search Southwest flights
Delta	PriceFrom $318	Free Cancellation	Rating 7.8 8,519 reviews	Search Delta flights

Alexandria

National Harbor

Arlington

Gettysburg

Winchester

Waldorf

Laurel

Woodbridge

Fredericksburg

Gaithersburg

Linthicum Heights

Rockville

Silver Spring

Towson

Sterling

Springfield

Colonial Beach

Fairfax

Edgewood

Tysons

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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Cheap flights from Ontario to Washington, D.C. from $116

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 9/15. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

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

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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

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

momondo Fare Finder

Use the filters below to find and compare flights from Ontario to Washington, D.C. Dulles Intl Airport that are best for you.

See travel insights to Washington, D.C. from

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

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?

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

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

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

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

What is the cheapest airline that flies from Ontario to Washington, D.C. Dulles Intl?

What airlines fly to Washington, D.C. Dulles Intl Airport?

Which airport is the most popular layover for flights between Ontario and Washington, D.C. Dulles Intl Airport?

Which layover airport offers the lowest fares from Ontario to Washington, D.C. Dulles Intl Airport?

Which layover airport has the shortest travel time from Ontario to Washington, D.C. Dulles Intl Airport?

Which layover airport has the shortest connection time from Ontario to Washington, D.C. Dulles Intl Airport?

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

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

Best Price Found

Fastest flight time

Direct flights

Frequently asked questions about flying 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

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Popular cities in the United States

Popular flights according to clicks in the last 7 days on momondo

Ontario flight routes

According to popular flight searches on momondo this year

Washington, D.C. Dulles Intl Airport flight routes

According to popular flight searches on momondo this year

Fly your favorite airline to Washington, D.C.

Airlines are sorted and displayed according to clicks in the past 7 days on momondo

Cabin classes currently available on flights to Washington, D.C.

List of cabin classes available on flights landing in Washington, D.C.. Availability may vary depending on flight origin and airline.

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