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

As of July 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 connection time from Ontario to Washington, D.C.?

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

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 day?

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

Denver (DEN) was the most common stop: 36% of momondo users choosing 1-stop flights on this route connected there.

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

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

What airlines fly to Washington, D.C.?

United Airlines, American Airlines and Southwest 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 47% 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 $264.

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 July 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.

$120 Cheap Flights from Ontario to Washington, D.C. in 2026

Discover deals from 900+ travel sites with momondo.

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

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

10:59 am - 8:37 pm

ONT

BWI

30h 38m

1 stop

5:22 pm - 2:37 pm

BWI

ONT

24h 15m

1 stop

$242Frontier

Tue, Sep 1 - Wed, Sep 9

7:46 pm - 12:00 pm

ONT

BWI

13h 14m

1 stop

1:29 pm - 6:39 pm

BWI

ONT

8h 10m

1 stop

$242Frontier

Thu, Sep 17 - Thu, Sep 24

3:14 pm - 6:30 am

ONT

BWI

12h 16m

1 stop

5:42 pm - 5:48 pm

BWI

ONT

27h 06m

1 stop

$314Multiple Airlines

Wed, Sep 16 - Sat, Sep 26

7:12 am - 3:40 pm

ONT

BWI

29h 28m

1 stop

5:42 pm - 5:48 pm

BWI

ONT

27h 06m

1 stop

$314Multiple Airlines

Tue, Sep 15 - Sat, Sep 26

10:25 am - 8:24 pm

ONT

IAD

6h 59m

1 stop

6:42 am - 1:30 pm

IAD

ONT

9h 48m

1 stop

$347American Airlines

Wed, Sep 23 - Wed, Oct 7

10:25 am - 8:24 pm

ONT

IAD

6h 59m

1 stop

6:52 am - 1:25 pm

IAD

ONT

9h 33m

1 stop

$347American Airlines

Sat, Sep 12 - Wed, Sep 16

10:00 pm - 9:20 am

ONT

IAD

8h 20m

1 stop

6:00 am - 10:42 am

IAD

ONT

7h 42m

1 stop

$347Delta

Thu, Aug 27 - Wed, Sep 2

6:08 am - 4:22 pm

ONT

IAD

7h 14m

1 stop

3:02 pm - 9:59 pm

IAD

ONT

9h 57m

1 stop

$347United Airlines

Wed, Sep 16 - Sat, Sep 26

6:08 am - 4:22 pm

ONT

IAD

7h 14m

1 stop

6:42 am - 12:12 pm

IAD

ONT

8h 30m

1 stop

$347United Airlines

Wed, Sep 16 - Wed, Sep 23

10:00 pm - 9:20 am

ONT

IAD

8h 20m

1 stop

6:00 am - 10:42 am

IAD

ONT

7h 42m

1 stop

$348Delta

Thu, Aug 27 - Wed, Sep 2

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

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

Alaska Airlines

Sep 29

ONT12:12 pmOntario

8h 47m

1 stop

IAD11:59 pmWashington, D.C. Dulles Intl

Oct 6

IAD9:38 amWashington, D.C. Dulles Intl

11h 22m

1 stop

ONT6:00 pmOntario

$341

Alaska Airlines

Sep 15

ONT12:12 pmOntario

8h 47m

1 stop

IAD11:59 pmWashington, D.C. Dulles Intl

Sep 23

IAD7:00 amWashington, D.C. Dulles Intl

10h 16m

1 stop

ONT2:16 pmOntario

$351

Alaska Airlines

Sep 22

ONT3:14 pmOntario

11h 26m

1 stop

IAD5:40 amWashington, D.C. Dulles Intl

Oct 17

IAD7:02 amWashington, D.C. Dulles Intl

9h 14m

1 stop

ONT1:16 pmOntario

$371

Delta flights from Ontario to Washington, D.C.

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

Delta

Aug 27

ONT10:00 pmOntario

8h 20m

1 stop

IAD9:20 amWashington, D.C. Dulles Intl

Sep 2

IAD6:00 amWashington, D.C. Dulles Intl

7h 42m

1 stop

ONT10:42 amOntario

$348

Delta

Aug 27

ONT7:05 amOntario

8h 23m

1 stop

IAD6:28 pmWashington, D.C. Dulles Intl

Sep 2

IAD3:03 pmWashington, D.C. Dulles Intl

7h 50m

1 stop

ONT7:53 pmOntario

$360

Delta

Aug 27

ONT7:05 amOntario

8h 23m

1 stop

IAD6:28 pmWashington, D.C. Dulles Intl

Sep 2

IAD3:03 pmWashington, D.C. Dulles Intl

7h 50m

1 stop

ONT7:53 pmOntario

$361

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Tue 9/1

10:59 am-8:37 pm

1 stop30h 38m

Baltimore/Washington

Wed 9/9

5:22 pm-2:37 pm

1 stop24h 15m

$242

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Thu 9/17

7:46 pm-12:00 pm

1 stop13h 14m

Baltimore/Washington

Thu 9/24

1:29 pm-6:39 pm

1 stop8h 10m

$242

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Wed 9/16

3:14 pm-6:30 am

1 stop12h 16m

Baltimore/Washington

Sat 9/26

5:42 pm-5:48 pm

1 stop27h 06m

$314

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Tue 9/15

7:12 am-3:40 pm

1 stop29h 28m

Baltimore/Washington

Sat 9/26

5:42 pm-5:48 pm

1 stop27h 06m

$314

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Wed 9/23

10:25 am-8:24 pm

1 stop6h 59m

Washington, D.C. Dulles Intl

Wed 10/7

6:42 am-1:30 pm

1 stop9h 48m

$347

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Sat 9/12

10:25 am-8:24 pm

1 stop6h 59m

Washington, D.C. Dulles Intl

Wed 9/16

6:52 am-1:25 pm

1 stop9h 33m

$347

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Thu 8/27

10:00 pm-9:20 am

1 stop8h 20m

Washington, D.C. Dulles Intl

Wed 9/2

6:00 am-10:42 am

1 stop7h 42m

$347

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Wed 9/16

6:08 am-4:22 pm

1 stop7h 14m

Washington, D.C. Dulles Intl

Sat 9/26

3:02 pm-9:59 pm

1 stop9h 57m

$347

Quickest round-trip

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Wed 9/16

6:08 am-4:22 pm

1 stop7h 14m

Washington, D.C. Dulles Intl

Wed 9/23

6:42 am-12:12 pm

1 stop8h 30m

$347

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Thu 8/27

10:00 pm-9:20 am

1 stop8h 20m

Washington, D.C. Dulles Intl

Wed 9/2

6:00 am-10:42 am

1 stop7h 42m

$348

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.?

Prices are currently low for flights on this route.

Typical prices usually range from $256 to $380.
The lowest price recently found on this route was $242.

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

The month of September is, on average, the cheapest month to fly to Washington, D.C. from Ontario, with most prices found around $303. If you’re not able to fly to Washington, D.C. in September, then January is your next best option. Flight prices from Ontario to Washington, D.C. during January average around $380.

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 $466. 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 $641.

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 $431. 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 $536. 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 22% 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 July 2026, prices for Ontario to Washington, D.C. flights are approximately 53% 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	$262
Fastest flight time	4h 50m
Direct flights	Mon 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 $262. The best round-trip flight deal from Ontario to Washington, D.C. found on momondo in the last 72 hours is $459.

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

Direct flights go from Ontario to Washington, D.C. on Monday 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 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 July 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 Airbus A318/A319/A320/A321, representing 16.00% of all bookings. The subsequent popular models are Boeing 737-800 Passenger/BBJ2 (winglets) at 12.00%, Boeing 737 MAX 8 at 10.67%, and Boeing 737 MAX 9 at 9.33%.
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 34% of the total bookings. Other popular airlines include Southwest with 33%, American Airlines with 13%, and Delta with 11%.

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 $105	Free Cancellation	Rating 5.6 2,754 reviews	Search Frontier flights
Delta	PriceFrom $183	Free Cancellation	Rating 7.8 8,483 reviews	Search Delta flights
United Airlines	PriceFrom $226	Free Cancellation	Rating 7.4 10,041 reviews	Search United Airlines flights
Southwest	PriceFrom $276	Free Cancellation	Rating 8.0 4,228 reviews	Search Southwest flights
American Airlines	PriceFrom $278	Free Cancellation	Rating 7.1 11,836 reviews	Search American Airlines flights

Alexandria

National Harbor

Arlington

Gettysburg

Waldorf

Laurel

Woodbridge

Fredericksburg

Gaithersburg

Linthicum Heights

Rockville

Manassas

Silver Spring

Towson

Colonial Beach

Springfield

Fairfax

Tysons

Bethesda

Edgewood

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 $120

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 10/15. 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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Alaska Airlines flights from Ontario to Washington, D.C.

Our best Alaska 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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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

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.

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

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