What airlines fly to Washington, D.C.?

United Airlines, Southwest and American Airlines are the top three most popular airlines that fly to Washington, D.C. from Ontario according to our data. United Airlines is the first choice among our users, with 45% of people opting to fly with this airline when traveling to Washington, D.C.. Keep in mind that there are 8 different airlines that fly to Washington, D.C. on a routine basis, so you have a few additional options to choose from.

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

Denver (DEN) was the most common stop: 50% of momondo users choosing 1-stop flights on this route connected there.

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

Atlanta (ATL) has the shortest average layover time for this route: 1h 22m.

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

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

How many flights depart from Ontario to Washington, D.C. on average per week?

As of June 2026, 6 flights take off from Ontario and land in Washington, D.C. each week. The most common flight departure day for this route is Mon, with 17% of weekly flights taking off on this day.

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

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

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

Flights via Denver (DEN) offer the lowest average round-trip price of $257.

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

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

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

There are 5 operators available for flights from Ontario Airport to Washington, D.C. as of June 2026.

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

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..

What documentation or ID do you need to fly to Washington, D.C.?

The required travel and health documents for your Washington, D.C. trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Washington, D.C.. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

$113 Cheap Flights from Ontario to Washington, D.C. in 2026

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

Prices are currently low for flights on this route. Typical prices usually range from $466 to $277. The lowest price recently found on this route was $257.

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

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

Enter your travel dates to find the best prices.

12:00 pm - 10:44 pm

ONT

DCA

7h 44m

1 stop

5:54 pm - 10:23 pm

DCA

ONT

7h 29m

1 stop

$257Delta

Wed, Aug 26 - Tue, Sep 1

12:55 pm - 11:39 pm

ONT

IAD

7h 44m

1 stop

6:00 am - 11:04 am

IAD

ONT

8h 04m

1 stop

$257Delta

Wed, Aug 26 - Tue, Sep 8

7:05 am - 5:30 pm

ONT

DCA

7h 25m

1 stop

7:00 am - 11:04 am

DCA

ONT

7h 04m

1 stop

$259Delta

Sat, Aug 29 - Tue, Sep 8

11:59 pm - 12:43 pm

ONT

DCA

9h 44m

1 stop

5:00 am - 9:34 am

DCA

ONT

7h 34m

1 stop

$261American Airlines

Mon, Aug 24 - Mon, Aug 31

3:40 pm - 8:20 am

ONT

IAD

13h 40m

1 stop

9:57 pm - 8:37 am

IAD

ONT

13h 40m

1 stop

$262Frontier

Sat, Jul 11 - Sat, Jul 18

3:40 pm - 8:20 am

ONT

IAD

13h 40m

1 stop

9:57 pm - 8:37 am

IAD

ONT

13h 40m

1 stop

$274Frontier

Sat, Jul 11 - Sat, Jul 18

1:18 pm - 12:32 am

ONT

IAD

8h 14m

1 stop

5:48 pm - 10:59 pm

IAD

ONT

8h 11m

1 stop

$275United Airlines

Mon, Aug 24 - Mon, Aug 31

1:50 pm - 12:55 am

ONT

IAD

8h 05m

1 stop

3:02 pm - 9:59 pm

IAD

ONT

9h 57m

1 stop

$296United Airlines

Tue, Aug 4 - Thu, Aug 13

12:37 pm - 11:59 pm

ONT

DCA

8h 22m

1 stop

7:29 am - 11:27 am

DCA

ONT

6h 58m

1 stop

$303American Airlines

Tue, Sep 22 - Tue, Oct 6

7:45 am - 8:25 pm

ONT

BWI

9h 40m

1 stop

10:20 am - 6:00 pm

BWI

ONT

10h 40m

1 stop

$358Southwest

Wed, Sep 2 - Mon, Sep 7

American Airlines flights from Ontario to Washington, D.C.

Our best American Airlines deals on Ontario to Washington, D.C. flight tickets

American Airlines

Aug 24

ONT11:59 pmOntario

9h 44m

1 stop

DCA12:43 pmWashington, D.C. Reagan-National

Aug 31

DCA5:00 amWashington, D.C. Reagan-National

7h 34m

1 stop

ONT9:34 amOntario

$261

American Airlines

Sep 22

ONT12:37 pmOntario

8h 22m

1 stop

DCA11:59 pmWashington, D.C. Reagan-National

Oct 6

DCA7:29 amWashington, D.C. Reagan-National

6h 58m

1 stop

ONT11:27 amOntario

$303

American Airlines

Aug 12

ONT12:59 pmOntario

15h 01m

1 stop

DCA7:00 amWashington, D.C. Reagan-National

Aug 19

DCA5:00 amWashington, D.C. Reagan-National

7h 34m

1 stop

ONT9:34 amOntario

$313

Frontier flights from Ontario to Washington, D.C.

Our best Frontier deals on Ontario to Washington, D.C. flight tickets

Frontier

Jul 11

ONT3:40 pmOntario

13h 40m

1 stop

IAD8:20 amWashington, D.C. Dulles Intl

Jul 18

IAD9:57 pmWashington, D.C. Dulles Intl

13h 40m

1 stop

ONT8:37 amOntario

$262

Frontier

Jul 11

ONT3:40 pmOntario

13h 40m

1 stop

IAD8:20 amWashington, D.C. Dulles Intl

Jul 18

IAD9:57 pmWashington, D.C. Dulles Intl

13h 40m

1 stop

ONT8:37 amOntario

$274

Frontier

Jul 25

ONT8:17 amOntario

9h 55m

1 stop

IAD9:12 pmWashington, D.C. Dulles Intl

Aug 11

IAD9:38 pmWashington, D.C. Dulles Intl

13h 59m

1 stop

ONT8:37 amOntario

$304

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Wed 8/26

12:00 pm-10:44 pm

1 stop7h 44m

Washington, D.C. Reagan-National

Tue 9/1

5:54 pm-10:23 pm

1 stop7h 29m

$257

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Wed 8/26

12:55 pm-11:39 pm

1 stop7h 44m

Washington, D.C. Dulles Intl

Tue 9/8

6:00 am-11:04 am

1 stop8h 04m

$257

Quickest round-trip

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Sat 8/29

7:05 am-5:30 pm

1 stop7h 25m

Washington, D.C. Reagan-National

Tue 9/8

7:00 am-11:04 am

1 stop7h 04m

$259

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Mon 8/24

11:59 pm-12:43 pm

1 stop9h 44m

Washington, D.C. Reagan-National

Mon 8/31

5:00 am-9:34 am

1 stop7h 34m

$261

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Sat 7/11

3:40 pm-8:20 am

1 stop13h 40m

Washington, D.C. Dulles Intl

Sat 7/18

9:57 pm-8:37 am

1 stop13h 40m

$262

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Sat 7/11

3:40 pm-8:20 am

1 stop13h 40m

Washington, D.C. Dulles Intl

Sat 7/18

9:57 pm-8:37 am

1 stop13h 40m

$274

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Mon 8/24

1:18 pm-12:32 am

1 stop8h 14m

Washington, D.C. Dulles Intl

Mon 8/31

5:48 pm-10:59 pm

1 stop8h 11m

$275

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Tue 8/4

1:50 pm-12:55 am

1 stop8h 05m

Washington, D.C. Dulles Intl

Thu 8/13

3:02 pm-9:59 pm

1 stop9h 57m

$296

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Tue 9/22

12:37 pm-11:59 pm

1 stop8h 22m

Washington, D.C. Reagan-National

Tue 10/6

7:29 am-11:27 am

1 stop6h 58m

$303

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Wed 9/2

7:45 am-8:25 pm

1 stop9h 40m

Baltimore/Washington

Mon 9/7

10:20 am-6:00 pm

1 stop10h 40m

$358

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.

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

Other information

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

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

The month of July is, on average, the cheapest month to fly to Washington, D.C. from Ontario, with most prices found around $68. If you’re not able to fly to Washington, D.C. in July, then November is your next best option. Flight prices from Ontario to Washington, D.C. during November average around $97.

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

On average, the least expensive day to fly to Washington, D.C. from Ontario is on a Wednesday. momondo users have found tickets for Wednesday departures for as low as $456. However, this price may fluctuate depending on the airline, the season, and holidays. 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. for around $623.

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

In the afternoon is the cheapest time of day to fly from Ontario to Washington, D.C. when you can find flight prices for as low as $422. Flying to Washington, D.C. in the afternoon is an ideal time because this is during off-peak travel hours. Try not to purchase tickets in the morning because they tend to be around $516. Of course, these prices can vary depending on the time of year and what airport you fly to.

What is the cheapest Ontario to Washington, D.C. flight route?

Fly from Ontario to Baltimore/Washington for the best Ontario - Washington, D.C. flight prices

What cabin class options are available on Ontario to Washington, D.C. flights?

There is only 1 cabin class available to choose from on Ontario to Washington, D.C. flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

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

You could potentially save up to 16% on your flight if you consider stops on a Ontario to Washington, D.C. flight.

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

As of June 2026, prices for Ontario to Washington, D.C. flights are approximately 8% more expensive when compared to flights at the same time last year.

When to book flights from Ontario to Washington, D.C.

Are you open to changing your travel dates? Check out the ideal times to fly from Ontario to Washington, D.C. 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. (ONT to WAS) flight deals and tips

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

Best Price Found	$188
Fastest flight time	4h 45m
Direct flights	Mon, Tue, Wed, Thu, Sat and Sun
Airports in Washington, D.C.	2 airports

The best one-way flight to Washington, D.C. from Ontario in the past 72 hours is $188. The best round-trip flight deal from Ontario to Washington, D.C. found on momondo in the last 72 hours is $497.

The fastest flight from Ontario to Washington, D.C. takes 4h 45m

Direct flights go from Ontario to Washington, D.C. on Monday, Tuesday, Wednesday, Thursday, Saturday and Sunday. There are no airlines offering direct flights.

There are 2 airports in Washington, D.C.. From Ontario there are direct flights to Baltimore/Washington (BWI).

Search flight deals

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

How far is Ontario to Washington, D.C. by plane?
Ontario and Washington, D.C. are 2260.6 mi apart from one another. In terms of flight time, this usually takes a little over 4h 45m.
When did momondo last update prices for flights from Ontario Airport to Washington, D.C.?
Prices for flights from Ontario Airport to Washington, D.C. are refreshed on a daily basis.
How many operators does momondo search for flights from Ontario Airport to Washington, D.C.?
There are 5 operators available for flights from Ontario Airport to Washington, D.C. as of June 2026.
How old do you have to be to fly from Ontario Airport to Washington, D.C.?
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..
What documentation or ID do you need to fly to Washington, D.C.?
The required travel and health documents for your Washington, D.C. trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Washington, D.C.. We recommend that you seek guidance from your airline or a reliable third party such as IATA.
What is the most popular plane model from Ontario to Washington, D.C.?
momondo data reveals that the most frequently booked plane model on the route from Ontario to Washington, D.C. is Boeing 737 MAX 8, representing 29.51% of all bookings. The subsequent popular models are Boeing 737-800 Passenger/BBJ2 (winglets) at 18.85%, Airbus A318/A319/A320/A321 at 9.02%, and Airbus A321neo at 6.56%.
What is the most popular airline from Ontario to Washington, D.C.?
Based on momondo bookings for flights between Ontario and Washington, D.C., the leading airline is Frontier, making up 38% of the total bookings. Other popular airlines include Southwest with 31%, American Airlines with 13%, and Delta with 10%.

Best airlines flying from Ontario to Washington, D.C.

Compare and see reviews for airlines that fly from Ontario to Washington, D.C. with momondo

Airline	Rating	Free Cancellation	Price
Frontier	PriceFrom $166	Free Cancellation	Rating 5.6 2,923 reviews	Search Frontier flights
Delta	PriceFrom $172	Free Cancellation	Rating 7.9 8,402 reviews	Search Delta flights
United Airlines	PriceFrom $226	Free Cancellation	Rating 7.4 9,768 reviews	Search United Airlines flights
American Airlines	PriceFrom $256	Free Cancellation	Rating 7.1 11,641 reviews	Search American Airlines flights
Southwest	PriceFrom $258	Free Cancellation	Rating 8.0 4,256 reviews	Search Southwest flights

Alexandria

National Harbor

Gettysburg

Arlington

Waldorf

Woodbridge

Laurel

Gaithersburg

Colonial Beach

Fredericksburg

Silver Spring

Rockville

Towson

Manassas

Linthicum Heights

Tysons

Springfield

Bethesda

Fairfax

College Park

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. momondo allows you to filter the results for Ontario to Washington, D.C. flights to just show those with flexible booking policies.

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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Fly into one of these airports located in Washington, D.C.

Washington, D.C. Reagan-National Airport

Washington, D.C. Dulles Intl Airport

Cheap flights from Ontario to Washington, D.C. from $127

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 8/24. 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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American Airlines flights from Ontario to Washington, D.C.

Our best American Airlines deals on Ontario to Washington, D.C. flight tickets

Frontier flights from Ontario to Washington, D.C.

Our best Frontier deals on Ontario to Washington, D.C. flight tickets

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

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

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

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

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

What is the cheapest Ontario to Washington, D.C. flight route?

What cabin class options are available on Ontario to Washington, D.C. flights?

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

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

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

What airlines fly to Washington, D.C.?

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

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

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

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

How many flights depart from Ontario to Washington, D.C. on average per week?

When to book flights from Ontario to Washington, D.C.

Cheap Ontario to Washington, D.C. (ONT to WAS) flight deals and tips

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

Best Price Found

Fastest flight time

Direct flights

Airports in Washington, D.C.

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

Best airlines flying from Ontario to Washington, D.C.

Compare and see reviews for airlines that fly from Ontario to Washington, D.C. with momondo

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

Why use momondo?

An easier way to manage your Washington, D.C. trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to the United States

Fly into one of these airports located in Washington, D.C.

Airports listed have a maximum distance of 22.4 mi from Washington, D.C.

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.

Popular cities in the United States

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

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