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

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

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 $277.

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

As of March 2026, 7 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 14% 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.

What airlines fly to Washington, D.C.?

Southwest, American Airlines and United Airlines are the top three most popular airlines that fly to Washington, D.C. from Ontario according to our data. Southwest is the first choice among our users, with 39% of people opting to fly with this airline when traveling to Washington, D.C.. Keep in mind that there are 7 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: 75% of momondo users choosing 1-stop flights on this route connected there.

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

As of March 2026, there are 1 flights per day flying from Ontario to Washington, D.C.. The most common time of day flights depart is 9:00PM, with 100% of flights taking off in the evening.

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

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.?

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 6 operators available for flights from Ontario Airport to Washington, D.C. as of March 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.

$66 Cheap Flights from Ontario to Washington, D.C. in 2026

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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.

12:59 am - 9:59 pm

ONT

DCA

18h 00m

1 stop

6:00 pm - 11:55 pm

DCA

ONT

8h 55m

1 stop

$177Frontier

Mon, Apr 13 - Sat, Apr 18

12:59 am - 1:00 pm

ONT

DCA

9h 01m

1 stop

6:00 pm - 11:55 pm

DCA

ONT

8h 55m

1 stop

$180Frontier

Mon, Apr 27 - Fri, May 1

9:26 pm - 9:59 pm

ONT

DCA

21h 33m

2 stops

8:00 am - 11:55 pm

DCA

ONT

18h 55m

1 stop

$183Frontier

Tue, Apr 7 - Wed, Apr 15

12:59 am - 9:59 pm

ONT

DCA

18h 00m

1 stop

6:00 pm - 11:55 pm

DCA

ONT

8h 55m

1 stop

$188Frontier

Mon, May 4 - Wed, May 20

6:20 am - 12:02 pm

ONT

DCA

26h 42m

1 stop

6:00 pm - 7:31 am

DCA

ONT

16h 31m

1 stop

$195Frontier

Sun, Apr 12 - Thu, Apr 16

11:53 am - 11:55 pm

ONT

IAD

9h 02m

1 stop

7:00 am - 1:39 pm

IAD

ONT

9h 39m

1 stop

$247Delta

Thu, Apr 16 - Tue, Apr 21

7:00 am - 11:03 pm

ONT

IAD

13h 03m

2 stops

7:00 am - 1:39 pm

IAD

ONT

9h 39m

1 stop

$252Delta

Wed, Apr 15 - Tue, Apr 21

6:00 am - 11:55 pm

ONT

IAD

14h 55m

2 stops

11:04 am - 10:37 pm

IAD

ONT

14h 33m

2 stops

$257Delta

Wed, Apr 15 - Tue, Apr 21

7:59 pm - 12:09 am

ONT

IAD

25h 10m

1 stop

7:10 am - 9:45 am

IAD

ONT

29h 35m

1 stop

$285Alaska Airlines

Fri, Apr 24 - Sun, Apr 26

6:00 am - 5:40 am

ONT

IAD

20h 40m

1 stop

7:00 am - 11:59 pm

IAD

ONT

19h 59m

1 stop

$295Alaska Airlines

Tue, Apr 14 - Tue, Apr 21

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

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

American Airlines

Mar 31

ONT7:59 pmOntario

9h 49m

2 stops

IAD8:48 amWashington, D.C. Dulles Intl

Apr 7

IAD5:59 pmWashington, D.C. Dulles Intl

7h 37m

1 stop

ONT10:36 pmOntario

$342

American Airlines

Apr 1

ONT7:59 pmOntario

9h 49m

2 stops

IAD8:48 amWashington, D.C. Dulles Intl

Apr 15

IAD7:00 amWashington, D.C. Dulles Intl

9h 18m

1 stop

ONT1:18 pmOntario

$345

American Airlines

Apr 1

ONT5:02 pmOntario

12h 46m

2 stops

IAD8:48 amWashington, D.C. Dulles Intl

Apr 15

IAD9:19 amWashington, D.C. Dulles Intl

12h 11m

2 stops

ONT6:30 pmOntario

$347

Delta flights from Ontario to Washington, D.C.

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

Delta

Apr 16

ONT11:53 amOntario

9h 02m

1 stop

IAD11:55 pmWashington, D.C. Dulles Intl

Apr 21

IAD7:00 amWashington, D.C. Dulles Intl

9h 39m

1 stop

ONT1:39 pmOntario

$247

Delta

Apr 15

ONT7:00 amOntario

13h 03m

2 stops

IAD11:03 pmWashington, D.C. Dulles Intl

Apr 21

IAD7:00 amWashington, D.C. Dulles Intl

9h 39m

1 stop

ONT1:39 pmOntario

$252

Delta

Apr 15

ONT6:00 amOntario

14h 55m

2 stops

IAD11:55 pmWashington, D.C. Dulles Intl

Apr 21

IAD11:04 amWashington, D.C. Dulles Intl

14h 33m

2 stops

ONT10:37 pmOntario

$257

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Mon 4/13

12:59 am-9:59 pm

1 stop18h 00m

Washington, D.C. Reagan-National

Sat 4/18

6:00 pm-11:55 pm

1 stop8h 55m

$177

Quickest round-trip

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Mon 4/27

12:59 am-1:00 pm

1 stop9h 01m

Washington, D.C. Reagan-National

Fri 5/1

6:00 pm-11:55 pm

1 stop8h 55m

$180

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Tue 4/7

9:26 pm-9:59 pm

2 stops21h 33m

Washington, D.C. Reagan-National

Wed 4/15

8:00 am-11:55 pm

1 stop18h 55m

$183

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Mon 5/4

12:59 am-9:59 pm

1 stop18h 00m

Washington, D.C. Reagan-National

Wed 5/20

6:00 pm-11:55 pm

1 stop8h 55m

$188

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Sun 4/12

6:20 am-12:02 pm

1 stop26h 42m

Washington, D.C. Reagan-National

Thu 4/16

6:00 pm-7:31 am

1 stop16h 31m

$195

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Thu 4/16

11:53 am-11:55 pm

1 stop9h 02m

Washington, D.C. Dulles Intl

Tue 4/21

7:00 am-1:39 pm

1 stop9h 39m

$247

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Wed 4/15

7:00 am-11:03 pm

2 stops13h 03m

Washington, D.C. Dulles Intl

Tue 4/21

7:00 am-1:39 pm

1 stop9h 39m

$252

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Wed 4/15

6:00 am-11:55 pm

2 stops14h 55m

Washington, D.C. Dulles Intl

Tue 4/21

11:04 am-10:37 pm

2 stops14h 33m

$257

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Fri 4/24

7:59 pm-12:09 am

1 stop25h 10m

Washington, D.C. Dulles Intl

Sun 4/26

7:10 am-9:45 am

1 stop29h 35m

$285

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Tue 4/14

6:00 am-5:40 am

1 stop20h 40m

Washington, D.C. Dulles Intl

Tue 4/21

7:00 am-11:59 pm

1 stop19h 59m

$295

Flights are sorted by cheapest round-trip flights first.

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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 cheapest month to fly to Washington, D.C.?

The month of January is, on average, the cheapest month to fly to Washington, D.C. from Ontario, with most prices found around $223. If you’re not able to fly to Washington, D.C. in January, then September is your next best option. Flight prices from Ontario to Washington, D.C. during September average around $226.

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 19% 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 March 2026, prices for Ontario to Washington, D.C. flights are approximately 57% 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	$187
Fastest flight time	4h 40m
Direct flights	Every day
Airports in Washington, D.C.	2 airports

The best one-way flight to Washington, D.C. from Ontario in the past 72 hours is $187. The best round-trip flight deal from Ontario to Washington, D.C. found on momondo in the last 72 hours is $375.

The fastest flight from Ontario to Washington, D.C. takes 4h 40m

Direct flights go from Ontario to Washington, D.C. every day.

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

Search flight deals

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 40m.
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 6 operators available for flights from Ontario Airport to Washington, D.C. as of March 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 21.28% of all bookings. The subsequent popular models are Boeing 737-800 Passenger/BBJ2 (winglets) at 18.09%, Airbus A321neo at 8.51%, and Boeing 757-200 (winglets) at 6.38%.
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 41% of the total bookings. Other popular airlines include Southwest with 30%, American Airlines with 12%, 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
Spirit Airlines	PriceFrom $72	Free Cancellation	Rating 6.3 8,505 reviews	Search Spirit Airlines flights
Frontier	PriceFrom $136	Free Cancellation	Rating 5.7 3,033 reviews	Search Frontier flights
Delta	PriceFrom $172	Free Cancellation	Rating 7.9 8,271 reviews	Search Delta flights
United Airlines	PriceFrom $226	Free Cancellation	Rating 7.4 9,408 reviews	Search United Airlines flights
Southwest	PriceFrom $258	Free Cancellation	Rating 8.0 4,314 reviews	Search Southwest flights
American Airlines	PriceFrom $278	Free Cancellation	Rating 7.1 11,403 reviews	Search American Airlines flights

Alexandria

National Harbor

Gettysburg

Arlington

Waldorf

Woodbridge

Colonial Beach

Laurel

Towson

Silver Spring

Gaithersburg

Fredericksburg

Rockville

Tysons

Manassas

Springfield

Bethesda

Fairfax

Linthicum Heights

Reston

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 $66

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 4/13. 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

Delta flights from Ontario to Washington, D.C.

Our best Delta 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 cheapest month to fly 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 day?

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.

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.

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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.

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