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

United Airlines, Alaska Airlines, and Delta 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 day?

As of June 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 travel time from Ontario to Washington, D.C.?

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

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

As of June 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.

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

Flights via Denver (DEN) offer the lowest average round-trip price of $130.

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

Denver (DEN) was the most common stop: 45% 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.

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.

$84 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 $618 to $409. The lowest price recently found on this route was $240.

Discover deals from 900+ travel sites with momondo.

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.

9:36 am - 8:39 pm

ONT

BWI

8h 03m

1 stop

4:29 pm - 5:52 pm

BWI

ONT

28h 23m

1 stop

$240Frontier

Thu, Aug 13 - Thu, Aug 20

9:36 am - 8:39 pm

ONT

BWI

8h 03m

1 stop

4:44 pm - 7:32 am

BWI

ONT

17h 48m

1 stop

$242Frontier

Thu, Aug 6 - Mon, Aug 10

9:32 am - 8:36 pm

ONT

BWI

8h 04m

1 stop

4:44 pm - 7:32 am

BWI

ONT

17h 48m

1 stop

$244Frontier

Fri, Jul 17 - Mon, Jul 20

9:36 am - 8:39 pm

ONT

BWI

8h 03m

1 stop

5:19 pm - 5:52 pm

BWI

ONT

27h 33m

1 stop

$250Frontier

Wed, Aug 12 - Wed, Aug 19

9:36 am - 8:39 pm

ONT

BWI

8h 03m

1 stop

4:44 pm - 7:32 am

BWI

ONT

17h 48m

1 stop

$252Frontier

Thu, Aug 6 - Mon, Aug 10

8:25 am - 8:55 pm

ONT

DCA

9h 30m

2 stops

12:55 pm - 6:55 pm

DCA

ONT

9h 00m

1 stop

$260Southwest

Tue, Sep 22 - Wed, Sep 30

7:00 am - 5:37 pm

ONT

IAD

7h 37m

1 stop

1:10 pm - 7:57 pm

IAD

ONT

9h 47m

1 stop

$270United Airlines

Wed, Sep 9 - Wed, Sep 23

12:00 pm - 12:10 am

ONT

IAD

9h 10m

1 stop

7:00 am - 12:10 pm

IAD

ONT

8h 10m

1 stop

$280Delta

Wed, Sep 9 - Tue, Sep 22

6:00 am - 4:21 pm

ONT

DCA

7h 21m

1 stop

5:40 pm - 9:54 pm

DCA

ONT

7h 14m

1 stop

$282Delta

Sat, Sep 12 - Sat, Sep 19

3:40 pm - 8:20 am

ONT

IAD

13h 40m

1 stop

6:03 am - 1:09 pm

IAD

ONT

10h 06m

1 stop

$292Multiple Airlines

Wed, Jul 29 - Wed, Aug 12

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

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

United Airlines

Sep 9

ONT7:00 amOntario

7h 37m

1 stop

IAD5:37 pmWashington, D.C. Dulles Intl

Sep 23

IAD1:10 pmWashington, D.C. Dulles Intl

9h 47m

1 stop

ONT7:57 pmOntario

$270

United Airlines

Nov 6

ONT7:00 amOntario

6h 52m

1 stop

DCA4:52 pmWashington, D.C. Reagan-National

Nov 9

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

8h 26m

1 stop

ONT10:26 pmOntario

$316

United Airlines

Sep 12

ONT7:00 amOntario

7h 37m

1 stop

IAD5:37 pmWashington, D.C. Dulles Intl

Sep 27

IAD6:35 amWashington, D.C. Dulles Intl

8h 43m

1 stop

ONT12:18 pmOntario

$326

Frontier flights from Ontario to Washington, D.C.

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

Frontier

Aug 12

ONT9:36 amOntario

8h 03m

1 stop

BWI8:39 pmBaltimore/Washington

Aug 17

BWI4:44 pmBaltimore/Washington

28h 08m

1 stop

ONT5:52 pmOntario

$240

Frontier

Aug 6

ONT9:36 amOntario

8h 03m

1 stop

BWI8:39 pmBaltimore/Washington

Aug 10

BWI4:44 pmBaltimore/Washington

17h 48m

1 stop

ONT7:32 amOntario

$242

Frontier

Jul 24

ONT9:32 amOntario

8h 04m

1 stop

BWI8:36 pmBaltimore/Washington

Jul 27

BWI4:44 pmBaltimore/Washington

17h 48m

1 stop

ONT7:32 amOntario

$244

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Thu 8/13

9:36 am-8:39 pm

1 stop8h 03m

Baltimore/Washington

Thu 8/20

4:29 pm-5:52 pm

1 stop28h 23m

$240

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Thu 8/6

9:36 am-8:39 pm

1 stop8h 03m

Baltimore/Washington

Mon 8/10

4:44 pm-7:32 am

1 stop17h 48m

$242

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Fri 7/17

9:32 am-8:36 pm

1 stop8h 04m

Baltimore/Washington

Mon 7/20

4:44 pm-7:32 am

1 stop17h 48m

$244

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Wed 8/12

9:36 am-8:39 pm

1 stop8h 03m

Baltimore/Washington

Wed 8/19

5:19 pm-5:52 pm

1 stop27h 33m

$250

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Thu 8/6

9:36 am-8:39 pm

1 stop8h 03m

Baltimore/Washington

Mon 8/10

4:44 pm-7:32 am

1 stop17h 48m

$252

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Tue 9/22

8:25 am-8:55 pm

2 stops9h 30m

Washington, D.C. Reagan-National

Wed 9/30

12:55 pm-6:55 pm

1 stop9h 00m

$260

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Wed 9/9

7:00 am-5:37 pm

1 stop7h 37m

Washington, D.C. Dulles Intl

Wed 9/23

1:10 pm-7:57 pm

1 stop9h 47m

$270

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Wed 9/9

12:00 pm-12:10 am

1 stop9h 10m

Washington, D.C. Dulles Intl

Tue 9/22

7:00 am-12:10 pm

1 stop8h 10m

$280

Quickest round-trip

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Sat 9/12

6:00 am-4:21 pm

1 stop7h 21m

Washington, D.C. Reagan-National

Sat 9/19

5:40 pm-9:54 pm

1 stop7h 14m

$282

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Wed 7/29

3:40 pm-8:20 am

1 stop13h 40m

Washington, D.C. Dulles Intl

Wed 8/12

6:03 am-1:09 pm

1 stop10h 06m

$292

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 $458. 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 $629.

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 $424. 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 $520. 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 11% 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 35% 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 50m
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 $188. The best round-trip flight deal from Ontario to Washington, D.C. found on momondo in the last 72 hours is $489.

The fastest flight from Ontario to Washington, D.C. takes 4h 50m

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

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 50m.
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 28.93% of all bookings. The subsequent popular models are Boeing 737-800 Passenger/BBJ2 (winglets) at 19.01%, Airbus A318/A319/A320/A321 at 9.09%, and Airbus A321neo at 6.61%.
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 37% of the total bookings. Other popular airlines include Southwest with 32%, 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 2,898 reviews	Search Frontier flights
Delta	PriceFrom $172	Free Cancellation	Rating 7.9 8,396 reviews	Search Delta flights
United Airlines	PriceFrom $226	Free Cancellation	Rating 7.4 9,804 reviews	Search United Airlines flights
American Airlines	PriceFrom $256	Free Cancellation	Rating 7.1 11,635 reviews	Search American Airlines flights
Southwest	PriceFrom $258	Free Cancellation	Rating 7.9 4,235 reviews	Search Southwest flights

Alexandria

National Harbor

Gettysburg

Arlington

Waldorf

Woodbridge

Laurel

Gaithersburg

Fredericksburg

Colonial Beach

Silver Spring

Rockville

Towson

Linthicum Heights

Manassas

Tysons

Springfield

Fairfax

Bethesda

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 $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 Ontario to Washington, D.C. departing on 7/14. 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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United Airlines flights from Ontario to Washington, D.C.

Our best United 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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Use the filters below to find and compare flights from Ontario to Washington, D.C. 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.

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 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.

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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According to popular flight searches on momondo this year

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