How long does it take to fly to Ontario?

Average flight duration from Washington, D.C. to Ontario depends on which airport you fly into and out of. Flying from Baltimore to Los Angeles is 5h 20m on average, while flying from Washington, D.C. to Los Angeles is 5h 31m on average. Los Angeles is the most popular airport in Ontario.

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

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

What airlines fly to Ontario?

United Airlines, Southwest and American Airlines are the top three most popular airlines that fly to Ontario from Washington, D.C. according to our data. United Airlines is the first choice among our users, with 51% of people opting to fly with this airline when traveling to Ontario. Keep in mind that there are 9 different airlines that fly to Ontario on a routine basis, so you have a few additional options to choose from.

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

Atlanta (ATL) has the shortest average layover time for this route: 0h 58m.

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

The number of flights available between Washington, D.C. and Ontario is 5 per week as of March 2026. The most frequent departure day is Mon, with 20% of weekly flights leaving on this day.

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

Atlanta (ATL) was the most common stop: 62% of momondo users choosing 1-stop flights on this route connected there.

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

Flights via Denver (DEN) offer the lowest average round-trip price of $279.

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

Flights connecting via Atlanta (ATL) have the shortest average one-way travel time: 7h 09m.

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

Prices for flights from Washington, D.C. to Ontario Airport were last updated today.

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

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

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

The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Washington, D.C. to Ontario Airport.

What documentation or ID do you need to fly to Ontario Airport?

The travel and health documents required for your trip to Ontario Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Ontario Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

$87 Cheap Flights from Washington, D.C. to Ontario in 2026

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6:00 pm - 11:55 pm

DCA

ONT

8h 55m

1 stop

12:59 am - 1:00 pm

ONT

DCA

9h 01m

1 stop

$191Frontier

Sat, Apr 18 - Mon, Apr 20

6:00 pm - 11:55 pm

DCA

ONT

8h 55m

1 stop

12:59 am - 1:00 pm

ONT

DCA

9h 01m

1 stop

$194Frontier

Sat, Apr 18 - Mon, Apr 20

6:00 pm - 11:55 pm

DCA

ONT

8h 55m

1 stop

12:59 am - 9:59 pm

ONT

DCA

18h 00m

1 stop

$200Frontier

Sat, Apr 18 - Tue, Apr 21

8:00 am - 11:55 pm

DCA

ONT

18h 55m

1 stop

5:33 pm - 1:00 pm

ONT

DCA

16h 27m

1 stop

$204Frontier

Tue, Apr 28 - Fri, May 1

8:00 am - 11:55 pm

DCA

ONT

18h 55m

1 stop

12:59 am - 1:00 pm

ONT

DCA

9h 01m

1 stop

$206Frontier

Wed, Apr 22 - Sun, Apr 26

7:00 am - 11:56 pm

DCA

ONT

19h 56m

1 stop

12:59 am - 9:59 pm

ONT

DCA

18h 00m

1 stop

$210Frontier

Wed, Apr 8 - Tue, Apr 14

6:00 pm - 11:55 pm

DCA

ONT

8h 55m

1 stop

6:00 am - 9:58 pm

ONT

DCA

12h 58m

1 stop

$214Frontier

Sat, May 2 - Tue, May 12

1:59 pm - 11:55 pm

DCA

ONT

12h 56m

1 stop

12:59 am - 1:00 pm

ONT

DCA

9h 01m

1 stop

$215Frontier

Tue, Apr 14 - Fri, Apr 17

7:00 am - 10:37 pm

IAD

ONT

18h 37m

1 stop

7:00 am - 11:55 pm

ONT

IAD

13h 55m

1 stop

$287Delta

Tue, Apr 14 - Thu, Apr 23

7:00 am - 1:39 pm

IAD

ONT

9h 39m

1 stop

7:00 am - 11:44 pm

ONT

IAD

13h 44m

2 stops

$292Delta

Tue, Apr 14 - Tue, Apr 21

Frontier flights from Washington, D.C. to Ontario

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

Frontier

Apr 18

DCA6:00 pmWashington, D.C. Reagan-National

8h 55m

1 stop

ONT11:55 pmOntario

Apr 20

ONT12:59 amOntario

9h 01m

1 stop

DCA1:00 pmWashington, D.C. Reagan-National

$191

Frontier

Apr 18

DCA6:00 pmWashington, D.C. Reagan-National

8h 55m

1 stop

ONT11:55 pmOntario

Apr 20

ONT12:59 amOntario

9h 01m

1 stop

DCA1:00 pmWashington, D.C. Reagan-National

$194

Frontier

Apr 18

DCA6:00 pmWashington, D.C. Reagan-National

8h 55m

1 stop

ONT11:55 pmOntario

Apr 21

ONT12:59 amOntario

18h 00m

1 stop

DCA9:59 pmWashington, D.C. Reagan-National

$200

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

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

Alaska Airlines

Apr 14

IAD7:00 amWashington, D.C. Dulles Intl

29h 39m

1 stop

ONT9:39 amOntario

Apr 28

ONT6:00 amOntario

15h 09m

1 stop

IAD12:09 amWashington, D.C. Dulles Intl

$307

Alaska Airlines

Apr 21

IAD7:00 amWashington, D.C. Dulles Intl

29h 45m

1 stop

ONT9:45 amOntario

Apr 24

ONT7:59 pmOntario

25h 10m

1 stop

IAD12:09 amWashington, D.C. Dulles Intl

$325

Alaska Airlines

May 1

IAD9:00 amWashington, D.C. Dulles Intl

17h 59m

1 stop

ONT11:59 pmOntario

May 11

ONT10:39 amOntario

16h 11m

1 stop

IAD5:50 amWashington, D.C. Dulles Intl

$326

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

Quickest round-trip

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Sat 4/18

6:00 pm-11:55 pm

1 stop8h 55m

Ontario

Mon 4/20

12:59 am-1:00 pm

1 stop9h 01m

$191

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Sat 4/18

6:00 pm-11:55 pm

1 stop8h 55m

Ontario

Mon 4/20

12:59 am-1:00 pm

1 stop9h 01m

$194

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Sat 4/18

6:00 pm-11:55 pm

1 stop8h 55m

Ontario

Tue 4/21

12:59 am-9:59 pm

1 stop18h 00m

$200

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Tue 4/28

8:00 am-11:55 pm

1 stop18h 55m

Ontario

Fri 5/1

5:33 pm-1:00 pm

1 stop16h 27m

$204

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Wed 4/22

8:00 am-11:55 pm

1 stop18h 55m

Ontario

Sun 4/26

12:59 am-1:00 pm

1 stop9h 01m

$206

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Wed 4/8

7:00 am-11:56 pm

1 stop19h 56m

Ontario

Tue 4/14

12:59 am-9:59 pm

1 stop18h 00m

$210

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Sat 5/2

6:00 pm-11:55 pm

1 stop8h 55m

Ontario

Tue 5/12

6:00 am-9:58 pm

1 stop12h 58m

$214

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Tue 4/14

1:59 pm-11:55 pm

1 stop12h 56m

Ontario

Fri 4/17

12:59 am-1:00 pm

1 stop9h 01m

$215

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Tue 4/14

7:00 am-10:37 pm

1 stop18h 37m

Ontario

Thu 4/23

7:00 am-11:55 pm

1 stop13h 55m

$287

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Tue 4/14

7:00 am-1:39 pm

1 stop9h 39m

Ontario

Tue 4/21

7:00 am-11:44 pm

2 stops13h 44m

$292

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

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

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What is the cheapest month to fly to Ontario?

In general, January is the cheapest month to fly from Washington, D.C. to Ontario. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $206. If you aren’t able to travel during the month of January, then book flights to Ontario from Washington, D.C. during July instead. Flights to Ontario in July, while not as cheap as those in January, still average around $342.

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

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

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

There is only 1 cabin class available to choose from on Washington, D.C. to Ontario 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 Washington, D.C. to Ontario flights?

You could potentially save up to 32% on your flight if you consider stops on a Washington, D.C. to Ontario flight.

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

As of March 2026, prices for Washington, D.C. to Ontario flights are approximately 67% more expensive when compared to flights at the same time last year.

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

Are you open to changing your travel dates? Check out the ideal times to fly from Washington, D.C. to Ontario according to our flight data. Find out which month and days have the cheapest flights.

Estimated round-trip price

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

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

Best Price Found	$250
Fastest flight time	5h 15m
Direct flights	Every day
Airports in Ontario	1 airport

The best one-way flight to Ontario from Washington, D.C. in the past 72 hours is $250. The best round-trip flight deal from Washington, D.C. to Ontario found on momondo in the last 72 hours is $398.

The fastest flight from Washington, D.C. to Ontario takes 5h 15m

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

There is 1 airport in Ontario. From Washington, D.C. there are direct flights to Ontario (ONT).

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How far is Washington, D.C. to Ontario by plane?
A flight from Washington, D.C. to Ontario will travel around 2260.6 mi. Flights usually cover this in 5h 15m, depending on flying conditions and air traffic around both airports.
When did momondo last update prices for flights from Washington, D.C. to Ontario Airport?
Prices for flights from Washington, D.C. to Ontario Airport were last updated today.
How many operators does momondo search for flights from Washington, D.C. to Ontario Airport?
There are 5 operators available for flights from Washington, D.C. to Ontario Airport as of March 2026.
How old do you have to be to fly from Washington, D.C. to Ontario Airport?
The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Washington, D.C. to Ontario Airport.
What documentation or ID do you need to fly to Ontario Airport?
The travel and health documents required for your trip to Ontario Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Ontario Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.
What is the most popular plane model from Washington, D.C. to Ontario?
Based on momondo bookings for this flight route, the most popular plane model on flight routes from Washington, D.C. to Ontario is Boeing 737-800 Passenger/BBJ2 (winglets) (42.20% of total bookings). The next most popular plane models are Boeing 737 MAX 8 (26.61%), Boeing 737 MAX 9 (5.50%), and Airbus A321neo (3.67%).
What is the most popular airline from Washington, D.C. to Ontario?
Based on momondo bookings for flights between Washington, D.C. and Ontario, the leading airline is Southwest, making up 35% of the total bookings. Other popular airlines include Frontier with 29%, American Airlines with 23%, and United Airlines with 9%.

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

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

Airline	Rating	Free Cancellation	Price
Frontier	PriceFrom $125	Free Cancellation	Rating 5.7 3,027 reviews	Search Frontier flights
Delta	PriceFrom $213	Free Cancellation	Rating 7.9 8,288 reviews	Search Delta flights
American Airlines	PriceFrom $256	Free Cancellation	Rating 7.1 11,468 reviews	Search American Airlines flights
United Airlines	PriceFrom $269	Free Cancellation	Rating 7.4 9,431 reviews	Search United Airlines flights
Southwest	PriceFrom $278	Free Cancellation	Rating 8.0 4,320 reviews	Search Southwest flights

Why use momondo?

Why should I use momondo to find a flight deal from Washington, D.C. to Ontario?

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Ontario from Washington, D.C..

Can I find flights from Washington, D.C. to Ontario with flexible booking policies on momondo?

momondo does allow users to show only those flights to Ontario from Washington, D.C. which offer a flexible booking policy as well as other useful filters and features.

How can momondo help me find flights from Washington, D.C. to Ontario?

Once you have performed a search for Washington, D.C. to Ontario flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

I’m not ready to book a flight from Washington, D.C. to Ontario right now. Can momondo alert me if prices change?

Of course. momondo tracks the price of Washington, D.C. to Ontario flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

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Cheap flights from Washington, D.C. to Los Angeles from $87

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Washington, D.C. to Los Angeles departing on 4/28. 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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How to get the cheapest flight ticket from Washington, D.C. to Ontario

What is the cheapest month to fly to Ontario?

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

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

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

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

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

What airlines fly to Ontario?

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

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

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

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

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

How long does it take to fly to Ontario?

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

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

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

Best Price Found

Fastest flight time

Direct flights

Airports in Ontario

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

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

Why use momondo?

An easier way to manage your Ontario 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

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