How long is the flight from Ontario to Washington, D.C.?

Departing from Ontario to Washington, D.C. will take you 7h 01m. Ontario and Washington, D.C. are separated by a distance of 2236 mi. This flight may include one or multiple stops.

What are the cheapest airlines flying from Ontario to Washington, D.C. round-trip?

Cheapflights users have booked flights from Ontario to Washington, D.C. round-trip from $105. Other airlines that can offer you cheap pricing are Delta, from $208, and United Airlines, from $226. Users have found that Frontier is 73% cheaper than the other options available to this destination.

What are the cheapest airlines to fly from Ontario to Washington, D.C. one-way?

For one-way options, check prices for Frontier. According to our data, you can fly for as low as $89. Users have also found prices from $92 and $128 on American Airlines and United Airlines, respectively.

In terms of precipitation, rainfall in Washington, D.C. ranges from 2.6 - 4.0 inches per month. May is typically the wettest month, when rainfall can reach 4.0 in. February is typically the driest time to visit Washington, D.C. when rainfall is around 2.6 in.

If weather is an important factor for your trip to Washington, D.C., use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 80.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 35.6 F).

What are the most popular routes from Ontario to Washington, D.C.?

When deciding which route to take from Ontario to Washington, D.C. consider Ontario - Washington, D.C. Dulles Intl, Ontario - Washington, D.C. Reagan-National or Ontario - Baltimore/Washington as they are the most popular.

What are the most popular airlines that fly from Ontario to Washington, D.C.?

The most popular airlines flying from Ontario to Washington, D.C. are Frontier, Southwest and American Airlines. Something to consider prior to booking your flight.

Most accurate provider : When it comes to deals on Ontario-Washington, D.C. flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Ontario-Washington, D.C. flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Ontario-Washington, D.C. flight searches over the past month and is updated monthly.

Most trusted provider : When it comes to deals on Ontario-Washington, D.C. flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Ontario-Washington, D.C. flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

What airport do you fly from for flights from Ontario to Washington, D.C.?

If you book a flight to Washington, D.C. from Ontario, you will be flying from Ontario, which is the city’s only airport. Ontario (ONT) is located 3.1 mi from the center of Ontario. There are 0 flights from Ontario to Washington, D.C. per day from 6 different airlines.

Can I find deals for flights from Ontario to Washington, D.C. that include hotel bookings?

Yes. In addition to deals on Ontario to Washington, D.C. flights, Cheapflights offers vacation packages that include both flights and hotel.

How can I find direct flights from Ontario to Washington, D.C.?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ontario to Washington, D.C..

Can I find deals for business class flights from Ontario to Washington, D.C.?

Yes. Cheapflights offers flight deals from Ontario to Washington, D.C. by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

$77+ Cheap Flights from Ontario to Washington, D.C.

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Cheap flight deals from Ontario to Washington, D.C.

Cheapest

Best

Last-minute

One-way

Cheapest flights from Ontario to Washington, D.C.
Explore the most affordable flight options available from Ontario to Washington, D.C.. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 14, 2026.

Wed 9/167:11 pm -

1 stop13h 29m

Thu 9/241:29 pm -

1 stop8h 10m

Deal found 8/10

$232

Mon 9/287:46 pm -

1 stop12h 54m

Mon 10/51:29 pm -

1 stop8h 10m

Deal found 8/13

$233

Wed 9/97:11 pm -

1 stop13h 29m

Fri 9/111:29 pm -

1 stop8h 10m

Deal found 8/13

$237

Mon 8/319:33 am -

1 stop8h 04m

Wed 9/21:24 pm -

1 stop8h 37m

Deal found 8/11

$238

Mon 8/319:33 am -

1 stop8h 04m

Sat 9/51:24 pm -

1 stop8h 37m

Deal found 8/12

$239

Thu 9/176:45 pm -

1 stop22h 45m

Sat 9/195:42 pm -

1 stop27h 06m

Deal found 8/13

$242

Mon 8/319:33 am -

1 stop8h 04m

Tue 9/11:24 pm -

1 stop8h 37m

Deal found 8/12

$245

Sun 9/137:46 pm -

1 stop13h 14m

Thu 9/241:29 pm -

1 stop8h 10m

Deal found 8/9

$247

Fri 10/27:46 pm -

1 stop12h 54m

Sun 10/41:29 pm -

1 stop8h 10m

Deal found 8/13

$252

Thu 10/223:57 pm -

1 stop25h 28m

Sun 11/15:22 pm -

1 stop24h 15m

Deal found 8/11

$257

Thu 9/310:49 am -

1 stop8h 10m

Sat 9/196:00 pm -

1 stop8h 47m

Deal found 8/13

$257

Fri 9/410:17 pm -

1 stop6h 47m

Thu 9/1012:42 pm -

1 stop8h 57m

Deal found 8/14

$257

Best flights from Ontario to Washington, D.C.
Discover carefully curated flight deals from Ontario to Washington, D.C. that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 14, 2026.

Sat 9/121:18 pm -

1 stop7h 01m

Fri 10/26:35 am -

1 stop8h 43m

Deal found 8/13

$261

Fri 12/412:22 pm -

1 stop7h 22m

Sun 12/66:00 am -

1 stop8h 10m

Deal found 8/13

$351

Thu 11/58:45 pm -

2 stops8h 35m

Mon 11/94:25 pm -

2 stops9h 15m

Deal found 8/14

$365

Wed 9/233:14 pm -

1 stop11h 26m

Sat 9/267:00 am -

1 stop10h 16m

Deal found 8/9

$376

Wed 9/26:08 am -

1 stop7h 35m

Fri 9/45:45 pm -

1 stop8h 14m

Deal found 8/13

$325

Tue 9/11:06 pm -

1 stop7h 33m

Wed 9/93:15 pm -

1 stop8h 09m

Deal found 8/10

$351

Fri 10/231:52 pm -

1 stop8h 14m

Sun 10/256:15 am -

1 stop9h 14m

Deal found 8/13

$346

Thu 10/2211:15 pm -

1 stop7h 04m

Sat 10/316:13 am -

1 stop9h 09m

Deal found 8/10

$351

Fri 12/48:40 am -

2 stops8h 35m

Sun 12/66:10 am -

1 stop9h 55m

Deal found 8/13

$402

Wed 12/164:00 pm -

1 stop11h 21m

Tue 1/57:51 am -

1 stop9h 56m

Deal found 8/11

$415

Thu 9/31:56 pm -

1 stop8h 01m

Mon 9/76:42 am -

1 stop8h 30m

Deal found 8/9

$351

Mon 9/288:30 am -

2 stops11h 55m

Mon 10/53:40 pm -

2 stops11h 15m

Deal found 8/13

$405

Sun 8/3010:00 pm -

1 stop8h 20m

Sat 9/56:00 am -

1 stop7h 42m

Deal found 8/9

$381

Tue 2/26:00 am -

1 stop6h 55m

Wed 2/34:35 pm -

1 stop7h 46m

Deal found 8/11

$367

Thu 9/2412:12 pm -

1 stop15h 18m

Tue 9/297:50 am -

1 stop9h 26m

Deal found 8/12

$455

Sun 9/278:30 pm -

2 stops9h 20m

Thu 10/17:55 am -

1 stop9h 15m

Deal found 8/12

$419

Sat 10/311:29 pm -

1 stop6h 46m

Tue 11/32:38 pm -

1 stop10h 02m

Deal found 8/11

$367

Mon 12/1412:00 pm -

1 stop8h 59m

Tue 1/57:00 am -

1 stop10h 47m

Deal found 8/10

$460

Wed 11/256:20 am -

2 stops11h 30m

Wed 12/26:10 am -

2 stops9h 00m

Deal found 8/12

$424

Wed 9/26:08 am -

1 stop7h 10m

Fri 9/46:42 am -

1 stop8h 30m

Deal found 8/13

$369

Thu 9/34:27 pm -

2 stops20h 13m

Wed 9/97:15 pm -

1 stop19h 01m

Deal found 8/12

$474

Sun 8/3010:00 pm -

1 stop8h 19m

Sat 9/56:00 am -

1 stop7h 42m

Deal found 8/9

$484

Tue 9/297:00 am -

1 stop10h 09m

Sat 10/312:57 pm -

2 stops12h 54m

Deal found 8/13

$372

Wed 9/26:02 am -

1 stop21h 28m

Tue 9/157:50 am -

1 stop9h 26m

Deal found 8/11

$503

Fri 9/49:01 am -

1 stop10h 18m

Mon 9/76:42 am -

1 stop8h 30m

Deal found 8/11

$384

Wed 9/233:14 pm -

1 stop12h 16m

Tue 10/136:15 pm -

1 stop19h 02m

Deal found 8/11

$516

Fri 9/256:00 am -

1 stop9h 28m

Mon 9/2812:57 pm -

2 stops13h 02m

Deal found 8/11

$389

Thu 11/196:00 am -

1 stop7h 09m

Mon 11/232:05 pm -

1 stop7h 42m

Deal found 8/13

$401

Sat 9/51:18 pm -

1 stop7h 01m

Mon 9/76:30 am -

1 stop9h 20m

Deal found 8/11

$464

Wed 10/286:00 am -

1 stop9h 32m

Mon 11/212:50 pm -

2 stops12h 58m

Deal found 8/9

$466

Last-minute flights from Ontario to Washington, D.C.
Discover last-minute flight deals from Ontario to Washington, D.C.. Data last updated August 14, 2026 and is based on user searches.

Mon 8/319:33 am -

1 stop8h 04m

Tue 9/11:24 pm -

1 stop8h 37m

Deal found 8/11

$238

Mon 8/319:33 am -

1 stop8h 04m

Sat 9/51:24 pm -

1 stop8h 37m

Deal found 8/12

$239

Thu 9/310:49 am -

1 stop8h 10m

Sat 9/121:06 pm -

1 stop13h 41m

Deal found 8/13

$257

Fri 9/410:17 pm -

1 stop6h 47m

Thu 9/1012:42 pm -

1 stop8h 57m

Deal found 8/14

$257

Fri 9/46:00 am -

1 stop12h 59m

Sat 9/196:00 pm -

1 stop8h 47m

Deal found 8/13

$262

Fri 9/49:33 am -

1 stop8h 04m

Sun 9/61:24 pm -

1 stop21h 08m

Deal found 8/10

$263

Wed 9/97:11 pm -

1 stop13h 29m

Fri 9/111:29 pm -

1 stop8h 10m

Deal found 8/13

$237

Sat 9/121:18 pm -

1 stop7h 01m

Fri 10/26:35 am -

1 stop8h 43m

Deal found 8/13

$261

Sun 9/137:46 pm -

1 stop13h 14m

Thu 9/241:29 pm -

1 stop8h 10m

Deal found 8/9

$247

Wed 9/167:11 pm -

1 stop13h 29m

Wed 9/2312:45 pm -

1 stop8h 31m

Deal found 8/10

$232

Thu 9/176:45 pm -

1 stop22h 45m

Sat 9/195:42 pm -

1 stop27h 06m

Deal found 8/13

$242

Mon 9/287:46 pm -

1 stop12h 54m

Mon 10/51:29 pm -

1 stop8h 10m

Deal found 8/13

$233

One-way flights from Ontario to Washington, D.C.
Search for one-way flight options from Ontario to Washington, D.C.. Find affordable one-way fares based on user searches. Data last updated August 14, 2026.

Thu 9/1711:45 am -

1 stop7h 14m

Deal found 8/11

$77

Wed 9/911:45 am -

1 stop7h 14m

Deal found 8/11

$78

Wed 9/3011:45 am -

1 stop7h 14m

Deal found 8/13

$79

Mon 9/288:24 pm -

1 stop6h 56m

Deal found 8/13

$79

Wed 9/1611:45 am -

1 stop7h 14m

Deal found 8/13

$80

Tue 9/16:00 am -

1 stop7h 59m

Deal found 8/11

$81

Thu 9/108:24 pm -

1 stop6h 56m

Deal found 8/14

$82

Tue 11/36:15 am -

1 stop27h 34m

Deal found 8/13

$83

Wed 9/26:00 am -

1 stop27h 51m

Deal found 8/11

$84

Tue 9/13:40 pm -

1 stop13h 24m

Deal found 8/11

$84

Thu 10/111:45 am -

1 stop26h 14m

Deal found 8/13

$85

Wed 9/97:11 pm -

1 stop13h 22m

Deal found 8/14

$85

Find flight deals from Ontario to Washington, D.C.

Most accurate provider	FlightHub 3 stars
Most trusted provider	FlightHub 3 stars
Round-trip from	$232 (Frontier)
One-way from	$77 (Super.com)
Popular in	December
Cheapest in	January
Average price	$298
Good round-trip deal	$541 or less
Good one-way deal	$262 or less

Provider with most accurate pricing for Ontario-Washington, D.C. (WAS) flight deals.

Search Deals

Provider most trusted by Cheapflights users for Ontario-Washington, D.C. (WAS) flights.

Search Deals

From Ontario to Washington, D.C. (WAS)

Search Deals

One-way flight from Ontario to Washington, D.C. (WAS)

Search Deals

Highest demand for flights based on searches. 8% potential increase in price ($37 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 4% potential price decrease ($20 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in August 2026

Search Deals

Price to beat on a round-trip flight from Ontario to Washington, D.C. (WAS).

Search Deals

Price to beat on a one-way flight from Ontario to Washington, D.C. (WAS).

Search Deals

Cheapflights Fare Finder

Use the filters below to find and compare flights from Ontario to Washington, D.C. that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

OntarioWashington, D.C.

ONT Ontario - IAD Washington, D.C. Dulles Intl

ONTIAD

Ontario

Sat 9/12

1:18 pm-11:19 pm

1 stop7h 01m

Washington, D.C. Dulles Intl

Fri 10/2

6:35 am-12:18 pm

1 stop8h 43m

$261

OntarioWashington, D.C.

ONT Ontario - DCA Washington, D.C. Reagan-National

ONTDCA

Ontario

Wed 9/2

6:08 am-4:43 pm

1 stop7h 35m

Washington, D.C. Reagan-National

Fri 9/4

5:45 pm-10:59 pm

1 stop8h 14m

$325

OntarioWashington, D.C.

ONT Ontario - IAD Washington, D.C. Dulles Intl

ONTIAD

Ontario

Fri 10/23

1:52 pm-1:06 am

1 stop8h 14m

Washington, D.C. Dulles Intl

Sun 10/25

6:15 am-12:29 pm

1 stop9h 14m

$346

OntarioWashington, D.C.

ONT Ontario - DCA Washington, D.C. Reagan-National

ONTDCA

Ontario

Fri 12/4

12:22 pm-10:44 pm

1 stop7h 22m

Washington, D.C. Reagan-National

Sun 12/6

6:00 am-11:10 am

1 stop8h 10m

$351

OntarioWashington, D.C.

ONT Ontario - IAD Washington, D.C. Dulles Intl

ONTIAD

Ontario

Tue 9/1

1:06 pm-11:39 pm

1 stop7h 33m

Washington, D.C. Dulles Intl

Wed 9/9

3:15 pm-8:24 pm

1 stop8h 09m

$351

OntarioWashington, D.C.

ONT Ontario - IAD Washington, D.C. Dulles Intl

ONTIAD

Ontario

Thu 10/22

11:15 pm-9:19 am

1 stop7h 04m

Washington, D.C. Dulles Intl

Sat 10/31

6:13 am-12:22 pm

1 stop9h 09m

$351

OntarioWashington, D.C.

ONT Ontario - IAD Washington, D.C. Dulles Intl

ONTIAD

Ontario

Thu 9/3

1:56 pm-12:57 am

1 stop8h 01m

Washington, D.C. Dulles Intl

Mon 9/7

6:42 am-12:12 pm

1 stop8h 30m

$351

OntarioWashington, D.C.

ONT Ontario - DCA Washington, D.C. Reagan-National

ONTDCA

Ontario

Thu 11/5

8:45 pm-8:20 am

2 stops8h 35m

Washington, D.C. Reagan-National

Mon 11/9

4:25 pm-10:40 pm

2 stops9h 15m

$365

Quickest round-trip

OntarioWashington, D.C.

ONT Ontario - DCA Washington, D.C. Reagan-National

ONTDCA

Ontario

Tue 2/2

6:00 am-3:55 pm

1 stop6h 55m

Washington, D.C. Reagan-National

Wed 2/3

4:35 pm-9:21 pm

1 stop7h 46m

$367

OntarioWashington, D.C.

ONT Ontario - IAD Washington, D.C. Dulles Intl

ONTIAD

Ontario

Sat 10/31

1:29 pm-11:15 pm

1 stop6h 46m

Washington, D.C. Dulles Intl

Tue 11/3

2:38 pm-9:40 pm

1 stop10h 02m

$367

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/11

Showing 1-10 of 60 resultsSorted by cheapest first

...

Compare providers for flights from Ontario to Washington, D.C.

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Ontario to Washington, D.C. in August.

Provider	Price Accuracy	Trust Score*
Expedia	Price Accuracy1 star	Trust Score*3 stars
FlightHub	Price Accuracy3 stars	Trust Score*3 stars
Mytrip	Price Accuracy2 stars	Trust Score*3 stars
JustAirTicket	Price Accuracy-	Trust Score*1 star

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

Most accurate provider: When it comes to deals on Ontario-Washington, D.C. flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Ontario-Washington, D.C. flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Ontario-Washington, D.C. flight searches over the past month and is updated monthly.
Most trusted provider: When it comes to deals on Ontario-Washington, D.C. flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Ontario-Washington, D.C. flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Ontario to Washington, D.C.

Have a flexible travel schedule? Discover the best time to fly to Washington, D.C. from Ontario with our price prediction graph.

ONT-WAS

ONT-DCA

ONT-IAD

ONT-BWI

Estimated round-trip price

Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Ontario to Washington, D.C.

ONT-WAS

ONT-DCA

ONT-IAD

ONT-BWI

What is the cheapest month to book a flight from Ontario to Washington, D.C.?

Currently, September is the cheapest month in which you can book a flight from Ontario to Washington, D.C. (average of $286). Flying from Ontario to Washington, D.C. in June is currently the most expensive (average of $530). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from ONT to WAS?

When flying from Ontario to Washington, D.C., the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

How much does it cost to fly round-trip from Ontario to Washington, D.C.?

Airfare is below average for this route at the moment.

Ontario to Washington, D.C. flights typically cost between $242 and $396 in September.
The cheapest round-trip price found within the last 5 days was $232 on Frontier (Sep 16-Sep 23).

How far ahead should I book a flight from Ontario to Washington, D.C.?

The price you pay for your flight from Ontario to Washington, D.C. may vary depending on when you book. For the best chance of a lower fare, look to book 14 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

Reviews of airlines servicing Washington, D.C.

Read through reviews of airlines operating flights from Ontario to Washington, D.C., such as Southwest,Delta, andUnited Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

Southwest

8.0

Very good

4,218 reviews

Reviews

1 / 20

8.0

Excellent

La Tracimeldamarcos,Jun 2026

LAX - SLC

The second flight was not as comfortable as the first as we had to change planes to what seemed to be a slightly older aircraft. The seats weren’t as comfortable as the other plane. But it wasn’t bad.

Southwest

8.0

Very good

4,218 reviews

Southwest

8.0

Very good

4,218 reviews

Reviews

1 / 20

8.0

Excellent

La Tracimeldamarcos,Jun 2026

LAX - SLC

Delta

7.8

Good

8,503 reviews

Southwest

8.0

Very good

4,218 reviews

Reviews

1 / 20

8.0

Excellent

La Tracimeldamarcos,Jun 2026

LAX - SLC

United Airlines

7.4

Good

10,113 reviews

Southwest

8.0

Very good

4,218 reviews

Reviews

1 / 20

8.0

Excellent

La Tracimeldamarcos,Jun 2026

LAX - SLC

American Airlines

7.1

Good

11,924 reviews

Southwest

8.0

Very good

4,218 reviews

Reviews

1 / 20

8.0

Excellent

La Tracimeldamarcos,Jun 2026

LAX - SLC

Frontier

5.6

Fair

2,695 reviews

Southwest

8.0

Very good

4,218 reviews

Reviews

1 / 20

8.0

Excellent

La Tracimeldamarcos,Jun 2026

LAX - SLC

Related info for your journey

What airport do you fly from for flights from Ontario to Washington, D.C.?
If you book a flight to Washington, D.C. from Ontario, you will be flying from Ontario, which is the city’s only airport. Ontario (ONT) is located 3.1 mi from the center of Ontario. There are 0 flights from Ontario to Washington, D.C. per day from 6 different airlines.
How long is the flight from Ontario to Washington, D.C.?
Departing from Ontario to Washington, D.C. will take you 7h 01m. Ontario and Washington, D.C. are separated by a distance of 2236 mi. This flight may include one or multiple stops.
What are the cheapest airlines flying from Ontario to Washington, D.C. round-trip?
Cheapflights users have booked flights from Ontario to Washington, D.C. round-trip from $105. Other airlines that can offer you cheap pricing are Delta, from $208, and United Airlines, from $226. Users have found that Frontier is 73% cheaper than the other options available to this destination.
What are the cheapest airlines to fly from Ontario to Washington, D.C. one-way?
For one-way options, check prices for Frontier. According to our data, you can fly for as low as $89. Users have also found prices from $92 and $128 on American Airlines and United Airlines, respectively.
What are the most popular routes from Ontario to Washington, D.C.?
When deciding which route to take from Ontario to Washington, D.C. consider Ontario - Washington, D.C. Dulles Intl, Ontario - Washington, D.C. Reagan-National or Ontario - Baltimore/Washington as they are the most popular.
Can I find deals for flights from Ontario to Washington, D.C. that include hotel bookings?
Yes. In addition to deals on Ontario to Washington, D.C. flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Ontario to Washington, D.C.?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ontario to Washington, D.C..
Can I find deals for business class flights from Ontario to Washington, D.C.?
Yes. Cheapflights offers flight deals from Ontario to Washington, D.C. by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.
What is the cheapest month to book a flight from Ontario to Washington, D.C.?
Currently, September is the cheapest month in which you can book a flight from Ontario to Washington, D.C. (average of $286). Flying from Ontario to Washington, D.C. in June is currently the most expensive (average of $530). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Alexandria

Owings Mills

Arlington

Tysons

Springfield

Lanham

Reston

Herndon

Rockville

Hyattsville

Fredericksburg

Falls Church

Hanover

Laurel

Oxon Hill

Clinton

Hunt Valley

Woodbridge

Silver Spring

Largo

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Top 6 airlines flying from Ontario to Washington, D.C.

Airline	Cheapest	Average	Flexibility	On-time
Frontier	Cheapest$105	Average$312	FlexibilityNo cancel fee	On-time62%
Delta	Cheapest$183	Average$452	FlexibilityNo cancel fee	On-timeN/A
United Airlines	Cheapest$226	Average$483	FlexibilityNo cancel fee	On-time69%
Southwest	Cheapest$304	Average$470	FlexibilityNo cancel fee	On-time63%
American Airlines	Cheapest$312	Average$534	FlexibilityNo cancel fee	On-time71%
JetBlue	Cheapest$361	Average$464	FlexibilityNo cancel fee	On-time62%

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$77+ Cheap flights from Ontario (ONT) to Washington, D.C. (WAS)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 9/17. Fares are subject to change and may not be available on all flights or dates of travel.

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Cheap flight deals from Ontario to Washington, D.C.

Cheapest flights from Ontario to Washington, D.C.Explore the most affordable flight options available from Ontario to Washington, D.C.. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 14, 2026.

Explore the most affordable flight options available from Ontario to Washington, D.C.. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 14, 2026.

Best flights from Ontario to Washington, D.C.Discover carefully curated flight deals from Ontario to Washington, D.C. that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 14, 2026.

Discover carefully curated flight deals from Ontario to Washington, D.C. that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 14, 2026.

Last-minute flights from Ontario to Washington, D.C.Discover last-minute flight deals from Ontario to Washington, D.C.. Data last updated August 14, 2026 and is based on user searches.

Discover last-minute flight deals from Ontario to Washington, D.C.. Data last updated August 14, 2026 and is based on user searches.

One-way flights from Ontario to Washington, D.C.Search for one-way flight options from Ontario to Washington, D.C.. Find affordable one-way fares based on user searches. Data last updated August 14, 2026.

Search for one-way flight options from Ontario to Washington, D.C.. Find affordable one-way fares based on user searches. Data last updated August 14, 2026.

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Use the filters below to find and compare flights from Ontario to Washington, D.C. that are best for you.

Compare providers for flights from Ontario to Washington, D.C.

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Ontario to Washington, D.C. in August.

Best time to book a flight from Ontario to Washington, D.C.

Have a flexible travel schedule? Discover the best time to fly to Washington, D.C. from Ontario with our price prediction graph.

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What is the cheapest month to book a flight from Ontario to Washington, D.C.?

What is the cheapest time of day to fly from ONT to WAS?

Find hourly flight availability from Ontario to Washington, D.C.. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated August 14, 2026.

When flying from Ontario to Washington, D.C., the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

How much does it cost to fly round-trip from Ontario to Washington, D.C.?

Airfare is below average for this route at the moment.

Ontario to Washington, D.C. flights typically cost between $242 and $396 in September.The cheapest round-trip price found within the last 5 days was $232 on Frontier (Sep 16-Sep 23).

How far ahead should I book a flight from Ontario to Washington, D.C.?

The price you pay for your flight from Ontario to Washington, D.C. may vary depending on when you book. For the best chance of a lower fare, look to book 14 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

Reviews of airlines servicing Washington, D.C.

Read through reviews of airlines operating flights from Ontario to Washington, D.C., such as Southwest,Delta, andUnited Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

What airport do you fly from for flights from Ontario to Washington, D.C.?

How long is the flight from Ontario to Washington, D.C.?

What are the cheapest airlines flying from Ontario to Washington, D.C. round-trip?

What are the cheapest airlines to fly from Ontario to Washington, D.C. one-way?

What are the most popular routes from Ontario to Washington, D.C.?

Can I find deals for flights from Ontario to Washington, D.C. that include hotel bookings?

How can I find direct flights from Ontario to Washington, D.C.?

Can I find deals for business class flights from Ontario to Washington, D.C.?

What is the cheapest month to book a flight from Ontario to Washington, D.C.?

Traveling to a place near Washington, D.C.?

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Alternative routes for Ontario to Washington, D.C.

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Complete your trip

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Find flights from Ontario to Washington, D.C., based on your preferred cabin class, be it economy, premium economy, business, or first class.

Ontario and Washington, D.C. flights

Browse other Ontario and Washington, D.C. flight options. Last updated on August 14, 2026.

Other flights from Ontario

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Ontario to Washington, D.C. flights

Consider these flights traveling from Ontario to Washington, D.C..

Other flights to Washington, D.C.

Explore flights to Washington, D.C. departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on August 14, 2026.

Top 6 airlines flying from Ontario to Washington, D.C.

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Cheapest flights from Ontario to Washington, D.C.
Explore the most affordable flight options available from Ontario to Washington, D.C.. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 14, 2026.

Best flights from Ontario to Washington, D.C.
Discover carefully curated flight deals from Ontario to Washington, D.C. that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 14, 2026.

Last-minute flights from Ontario to Washington, D.C.
Discover last-minute flight deals from Ontario to Washington, D.C.. Data last updated August 14, 2026 and is based on user searches.

One-way flights from Ontario to Washington, D.C.
Search for one-way flight options from Ontario to Washington, D.C.. Find affordable one-way fares based on user searches. Data last updated August 14, 2026.

Ontario to Washington, D.C. flights typically cost between $242 and $396 in September.
The cheapest round-trip price found within the last 5 days was $232 on Frontier (Sep 16-Sep 23).