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 25m on average, while flying from Washington, D.C. to Los Angeles is 5h 25m on average. Los Angeles is the most popular airport in Ontario.

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

Denver (DEN) has the shortest average layover time for this route: 1h 13m.

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.

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 6 per week as of June 2026. The most frequent departure day is Sun, with 33% of weekly flights leaving on this day.

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

Flights connecting via Denver (DEN) have the shortest average one-way travel time: 7h 37m.

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 53% of people opting to fly with this airline when traveling to Ontario. Keep in mind that there are 8 different airlines that fly to Ontario on a routine basis, so you have a few additional options to choose from.

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

Atlanta (ATL) was the most common stop: 63% of momondo users choosing 1-stop flights on this route connected there.

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

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

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 June 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.

$84 Cheap Flights from Washington, D.C. to Ontario in 2026

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

Prices are currently low for flights on this route. Typical prices usually range from $294 to $559. The lowest price recently found on this route was $239.

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Washington, D.C. to Los Angeles

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

Enter your travel dates to find the best prices.

4:44 pm - 7:32 am

BWI

ONT

17h 48m

1 stop

9:33 am - 8:37 pm

ONT

BWI

8h 04m

1 stop

$239Frontier

Thu, Aug 13 - Thu, Aug 20

1:24 pm - 7:01 pm

BWI

ONT

8h 37m

1 stop

9:33 am - 8:37 pm

ONT

BWI

8h 04m

1 stop

$240Frontier

Sat, Aug 22 - Mon, Aug 31

4:44 pm - 7:32 am

BWI

ONT

17h 48m

1 stop

9:36 am - 8:39 pm

ONT

BWI

8h 03m

1 stop

$241Frontier

Sat, Aug 1 - Sat, Aug 8

4:44 pm - 7:32 am

BWI

ONT

17h 48m

1 stop

10:59 am - 8:37 pm

ONT

BWI

30h 38m

1 stop

$242Frontier

Mon, Aug 10 - Wed, Aug 19

4:44 pm - 7:32 am

BWI

ONT

17h 48m

1 stop

10:59 am - 8:37 pm

ONT

BWI

30h 38m

1 stop

$243Frontier

Mon, Aug 10 - Wed, Aug 19

4:44 pm - 7:32 am

BWI

ONT

17h 48m

1 stop

9:32 am - 8:36 pm

ONT

BWI

8h 04m

1 stop

$244Frontier

Sat, Jul 18 - Sat, Jul 25

4:44 pm - 7:32 am

BWI

ONT

17h 48m

1 stop

9:36 am - 8:39 pm

ONT

BWI

8h 03m

1 stop

$246Frontier

Wed, Aug 5 - Wed, Aug 12

4:44 pm - 7:32 am

BWI

ONT

17h 48m

1 stop

9:32 am - 8:36 pm

ONT

BWI

8h 04m

1 stop

$247Frontier

Tue, Jul 28 - Tue, Aug 4

5:16 pm - 11:52 pm

DCA

ONT

9h 36m

1 stop

10:50 am - 12:57 pm

ONT

DCA

23h 07m

1 stop

$327Multiple Airlines

Tue, Aug 11 - Tue, Aug 18

1:00 pm - 6:18 pm

IAD

ONT

8h 18m

1 stop

11:55 am - 11:51 pm

ONT

IAD

8h 56m

1 stop

$331Delta

Sat, Oct 31 - Mon, Nov 9

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Frontier flights from Washington, D.C. to Ontario

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

Frontier

Aug 13

BWI4:44 pmBaltimore/Washington

17h 48m

1 stop

ONT7:32 amOntario

Aug 20

ONT9:33 amOntario

8h 04m

1 stop

BWI8:37 pmBaltimore/Washington

$239

Frontier

Aug 22

BWI1:24 pmBaltimore/Washington

8h 37m

1 stop

ONT7:01 pmOntario

Aug 31

ONT9:33 amOntario

8h 04m

1 stop

BWI8:37 pmBaltimore/Washington

$240

Frontier

Aug 1

BWI4:44 pmBaltimore/Washington

17h 48m

1 stop

ONT7:32 amOntario

Aug 8

ONT9:36 amOntario

8h 03m

1 stop

BWI8:39 pmBaltimore/Washington

$241

Delta flights from Washington, D.C. to Ontario

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

Delta

Oct 31

IAD1:00 pmWashington, D.C. Dulles Intl

8h 18m

1 stop

ONT6:18 pmOntario

Nov 9

ONT11:55 amOntario

8h 56m

1 stop

IAD11:51 pmWashington, D.C. Dulles Intl

$331

Delta

Aug 11

DCA5:59 pmWashington, D.C. Reagan-National

8h 35m

1 stop

ONT11:34 pmOntario

Aug 17

ONT10:00 pmOntario

8h 10m

1 stop

DCA9:10 amWashington, D.C. Reagan-National

$341

Delta

Oct 31

DCA1:45 pmWashington, D.C. Reagan-National

7h 33m

1 stop

ONT6:18 pmOntario

Nov 9

ONT10:59 pmOntario

7h 13m

1 stop

DCA9:12 amWashington, D.C. Reagan-National

$351

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

BaltimoreOntario

BWI - ONT

BWIONT

Baltimore/Washington

Thu 8/13

4:44 pm-7:32 am

1 stop17h 48m

Ontario

Thu 8/20

9:33 am-8:37 pm

1 stop8h 04m

$239

Quickest round-trip

BaltimoreOntario

BWI - ONT

BWIONT

Baltimore/Washington

Sat 8/22

1:24 pm-7:01 pm

1 stop8h 37m

Ontario

Mon 8/31

9:33 am-8:37 pm

1 stop8h 04m

$240

BaltimoreOntario

BWI - ONT

BWIONT

Baltimore/Washington

Sat 8/1

4:44 pm-7:32 am

1 stop17h 48m

Ontario

Sat 8/8

9:36 am-8:39 pm

1 stop8h 03m

$241

BaltimoreOntario

BWI - ONT

BWIONT

Baltimore/Washington

Mon 8/10

4:44 pm-7:32 am

1 stop17h 48m

Ontario

Wed 8/19

10:59 am-8:37 pm

1 stop30h 38m

$242

BaltimoreOntario

BWI - ONT

BWIONT

Baltimore/Washington

Mon 8/10

4:44 pm-7:32 am

1 stop17h 48m

Ontario

Wed 8/19

10:59 am-8:37 pm

1 stop30h 38m

$243

BaltimoreOntario

BWI - ONT

BWIONT

Baltimore/Washington

Sat 7/18

4:44 pm-7:32 am

1 stop17h 48m

Ontario

Sat 7/25

9:32 am-8:36 pm

1 stop8h 04m

$244

BaltimoreOntario

BWI - ONT

BWIONT

Baltimore/Washington

Wed 8/5

4:44 pm-7:32 am

1 stop17h 48m

Ontario

Wed 8/12

9:36 am-8:39 pm

1 stop8h 03m

$246

BaltimoreOntario

BWI - ONT

BWIONT

Baltimore/Washington

Tue 7/28

4:44 pm-7:32 am

1 stop17h 48m

Ontario

Tue 8/4

9:32 am-8:36 pm

1 stop8h 04m

$247

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Tue 8/11

5:16 pm-11:52 pm

1 stop9h 36m

Ontario

Tue 8/18

10:50 am-12:57 pm

1 stop23h 07m

$327

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Sat 10/31

1:00 pm-6:18 pm

1 stop8h 18m

Ontario

Mon 11/9

11:55 am-11:51 pm

1 stop8h 56m

$331

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 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

Prices

Airlines

Layovers

Other information

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

What is the cheapest month to fly to Ontario?

In general, September 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 $100. If you aren’t able to travel during the month of September, then book flights to Ontario from Washington, D.C. during August instead. Flights to Ontario in August, while not as cheap as those in September, still average around $104.

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 33% 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 June 2026, prices for Washington, D.C. to Ontario flights are approximately 59% 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	$248
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 $248. The best round-trip flight deal from Washington, D.C. to Ontario found on momondo in the last 72 hours is $490.

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).

Search flight deals

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

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 June 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) (31.67% of total bookings). The next most popular plane models are Boeing 737 MAX 8 (20.83%), Boeing 737 MAX 9 (15.83%), and Boeing 757-300 (6.67%).
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 38% of the total bookings. Other popular airlines include American Airlines with 23%, Frontier with 21%, and United Airlines with 11%.

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 5.6 2,876 reviews	Search Frontier flights
Delta	PriceFrom $192	Free Cancellation	Rating 7.8 8,423 reviews	Search Delta flights
United Airlines	PriceFrom $222	Free Cancellation	Rating 7.4 9,868 reviews	Search United Airlines flights
Southwest	PriceFrom $278	Free Cancellation	Rating 7.9 4,242 reviews	Search Southwest flights
American Airlines	PriceFrom $283	Free Cancellation	Rating 7.1 11,723 reviews	Search American Airlines 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 $84

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 7/21. 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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Frontier flights from Washington, D.C. to Ontario

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

Delta flights from Washington, D.C. to Ontario

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

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

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

Frequently asked questions about flying from Washington, D.C. to 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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List of cabin classes available on flights landing in Los Angeles. Availability may vary depending on flight origin and airline.

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