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 $272. Other airlines that can offer you cheap pricing are Alaska Airlines, from $273, and Delta, from $276. Users have found that Hawaiian Airlines is 25% 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 American Airlines. According to our data, you can fly for as low as $102. Users have also found prices from $117 and $121 on United Airlines and Hawaiian 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 - Baltimore/Washington or Ontario - Washington, D.C. Reagan-National 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 American Airlines, Delta and Frontier. Something to consider prior to booking your flight.

What is the cheapest day to fly round-trip from Ontario to Washington, D.C.?

Flying to your destination on a Saturday can be more expensive, but this shouldn’t discourage you from finding affordable options to get to Washington, D.C.. Check prices with Cheapflights to find a great deal for your trip.

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

Find a great deal and save up to 81% by booking at least 53 days prior to your desired departure date, rather than waiting until the week of travel. According to our data, there are a number of flights available from Ontario to Washington, D.C. within the next two weeks, with the cheapest ticket starting at $392.

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

The best pricing can be found in the month of August. Prices to Washington, D.C. from Ontario average $362. You can even find prices in August for less than $362, as users have found deals to Washington, D.C. from as low as $131. The month of December appears to be one of the more expensive times to travel to Washington, D.C. from Ontario. Flying in the targeted month can save you up to 24%.

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.

$102+ Save on Flights from Ontario to Washington, D.C.

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Find cheap flights from Ontario to Washington, D.C. with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheapflights Tip: The best prices from Ontario to Washington, D.C. are usually found in April or August, booked 35 days in advance, depart on a Wednesday or Thursday and return on a Tuesday

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

Most accurate provider	FlightHub 3 stars
Most trusted provider	FlightHub 3 stars
Round-trip from	$272 (Hawaiian Airlines)
One-way from	$102 (American Airlines)
Popular in	June
Cheapest in	April
Average price	$378
Good round-trip deal	$378 or less
Good one-way deal	$191 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. 4% potential increase in price ($16 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 1% potential price decrease ($7 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in March 2025

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

Find 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 March 25, 2025.

Thu 5/14:29 pmONT - BWI

1 stop10h 17mHawaiian Airlines

Tue 5/67:06 amBWI - ONT

1 stop11h 26mHawaiian Airlines

Deal found 3/24

$272

Thu 5/16:24 pmONT - BWI

1 stop8h 22mAlaska Airlines

Tue 5/67:06 amBWI - ONT

1 stop11h 26mAlaska Airlines

Deal found 3/24

$273

Sat 4/2610:15 pmONT - BWI

1 stop7h 57mDelta

Sat 5/32:04 pmBWI - ONT

1 stop8h 24mDelta

Deal found 3/24

$276

Tue 4/112:59 amONT - BWI

1 stop12h 29mFrontier

Thu 4/312:05 pmBWI - ONT

1 stop8h 08mFrontier

Deal found 3/24

$278

Sat 4/512:59 amONT - DCA

1 stop8h 05mFrontier

Tue 4/87:00 amDCA - ONT

1 stop10h 27mFrontier

Deal found 3/24

$278

Sun 5/1110:15 pmONT - IAD

1 stop29h 16mFrontier

Sat 5/178:01 amIAD - ONT

1 stop16h 26mFrontier

Deal found 3/24

$288

Tue 4/86:00 amONT - BWI

1 stop9h 15mAmerican Airlines

Mon 4/147:08 pmBWI - ONT

1 stop7h 42mAmerican Airlines

Deal found 3/24

$301

Fri 5/25:05 amONT - BWI

2 stops9h 09mUnited Airlines

Wed 5/76:45 amBWI - ONT

2 stops10h 40mUnited Airlines

Deal found 3/24

$322

Wed 4/1610:40 pmONT - IAD

1 stop6h 58mAmerican Airlines

Sun 4/206:18 amIAD - ONT

1 stop8h 27mAmerican Airlines

Deal found 3/24

$322

Sat 4/2610:15 pmONT - DCA

1 stop7h 51mDelta

Sat 5/36:00 amDCA - ONT

1 stop7h 57mDelta

Deal found 3/24

$326

Sat 4/2610:15 pmONT - IAD

1 stop8h 04mDelta

Sat 5/36:00 amIAD - ONT

1 stop7h 57mDelta

Deal found 3/24

$326

Thu 9/256:27 pmONT - IAD

1 stop9h 12mUnited Airlines

Sun 9/285:30 pmIAD - ONT

1 stop8h 23mUnited Airlines

Deal found 3/24

$330

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 March 25, 2025.

Thu 5/14:29 pmONT - BWI

1 stop10h 17mHawaiian Airlines

Tue 5/67:06 amBWI - ONT

1 stop11h 26mHawaiian Airlines

Deal found 3/24

$272

Thu 5/16:24 pmONT - BWI

1 stop8h 22mAlaska Airlines

Tue 5/67:06 amBWI - ONT

1 stop11h 26mAlaska Airlines

Deal found 3/24

$273

Sat 4/2610:15 pmONT - BWI

1 stop7h 57mDelta

Sat 5/32:04 pmBWI - ONT

1 stop8h 24mDelta

Deal found 3/24

$276

Sun 4/612:59 amONT - BWI

1 stop7h 28mFrontier

Wed 4/98:49 pmBWI - ONT

1 stop13h 40mFrontier

Deal found 3/24

$278

Tue 4/86:00 amONT - BWI

1 stop9h 15mAmerican Airlines

Mon 4/147:08 pmBWI - ONT

1 stop7h 42mAmerican Airlines

Deal found 3/24

$301

Fri 5/25:05 amONT - BWI

2 stops9h 09mUnited Airlines

Wed 5/76:45 amBWI - ONT

2 stops10h 40mUnited Airlines

Deal found 3/24

$322

Sat 5/246:15 pmONT - BWI

1 stop8h 35mSouthwest

Sun 6/86:25 pmBWI - ONT

Nonstop5h 20mSouthwest

Deal found 3/24

$332

Thu 8/1412:59 amONT - BWI

1 stop12h 27mMultiple Airlines

Sun 8/247:51 amBWI - ONT

1 stop9h 15mMultiple Airlines

Deal found 3/24

$470

Sat 4/512:59 amONT - DCA

1 stop8h 05mFrontier

Tue 4/87:00 amDCA - ONT

1 stop10h 27mFrontier

Deal found 3/24

$278

Sun 5/1110:15 pmONT - IAD

1 stop29h 16mFrontier

Sat 5/178:01 amIAD - ONT

1 stop16h 26mFrontier

Deal found 3/24

$288

Wed 4/1610:40 pmONT - IAD

1 stop6h 58mAmerican Airlines

Sun 4/206:18 amIAD - ONT

1 stop8h 27mAmerican Airlines

Deal found 3/24

$322

Sat 4/2610:15 pmONT - DCA

1 stop7h 51mDelta

Sat 5/36:00 amDCA - ONT

1 stop7h 57mDelta

Deal found 3/24

$326

Last-minute flights from Ontario to Washington, D.C.
Discover last-minute flight deals from Ontario to Washington, D.C.. Data last updated March 25, 2025 and is based on user searches.

Mon 3/3112:59 amONT - DCA

1 stop8h 05mFrontier

Fri 4/46:00 pmDCA - ONT

1 stop8h 59mFrontier

Deal found 3/24

$278

Mon 3/3112:55 pmONT - IAD

2 stops8h 50mSouthwest

Mon 4/76:00 amIAD - ONT

1 stop10h 55mSouthwest

Deal found 3/24

$572

Tue 4/112:59 amONT - BWI

1 stop12h 29mFrontier

Thu 4/312:05 pmBWI - ONT

1 stop8h 08mFrontier

Deal found 3/24

$278

Tue 4/16:00 amONT - BWI

1 stop9h 11mAmerican Airlines

Wed 4/96:15 amBWI - ONT

1 stop10h 34mAmerican Airlines

Deal found 3/25

$434

Tue 4/17:00 amONT - BWI

1 stop7h 46mDelta

Wed 4/97:00 amBWI - ONT

1 stop7h 29mDelta

Deal found 3/25

$443

Tue 4/112:46 pmONT - DCA

1 stop7h 54mDelta

Wed 4/96:00 amDCA - ONT

1 stop8h 29mDelta

Deal found 3/24

$483

Tue 4/15:30 pmONT - IAD

1 stop9h 49mDelta

Wed 4/96:00 amIAD - ONT

1 stop8h 29mDelta

Deal found 3/24

$483

Tue 4/110:57 amONT - IAD

2 stops10h 01mAmerican Airlines

Wed 4/96:18 amIAD - ONT

1 stop8h 27mAmerican Airlines

Deal found 3/24

$490

Tue 4/16:35 amONT - DCA

2 stops8h 10mSouthwest

Wed 4/24:00 pmDCA - ONT

2 stops9h 40mSouthwest

Deal found 3/24

$649

Tue 4/17:00 amONT - DCA

2 stops11h 59mMultiple Airlines

Thu 4/36:00 pmDCA - ONT

1 stop8h 59mMultiple Airlines

Deal found 3/24

$658

Tue 4/16:00 amONT - DCA

2 stops13h 15mAlaska Airlines

Wed 4/911:54 amDCA - ONT

2 stops15h 05mAlaska Airlines

Deal found 3/24

$690

Thu 4/312:59 amONT - BWI

1 stop7h 28mMultiple Airlines

Mon 4/77:03 pmBWI - ONT

2 stops17h 25mMultiple Airlines

Deal found 3/24

$617

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 March 25, 2025.

Tue 4/2910:40 pmONT - BWI

1 stop7h 59mAmerican Airlines

Deal found 3/24

$102

Thu 4/241:35 pmONT - BWI

1 stop6h 55mUnited Airlines

Deal found 3/24

$117

Fri 5/24:29 pmONT - BWI

1 stop10h 17mHawaiian Airlines

Deal found 3/24

$121

Tue 4/2912:59 amONT - DCA

1 stop13h 00mFrontier

Deal found 3/24

$127

Sat 4/2610:15 pmONT - BWI

1 stop7h 57mDelta

Deal found 3/23

$139

Fri 4/2510:53 amONT - BWI

1 stop15h 53mMultiple Airlines

Deal found 3/24

$141

Wed 4/27:58 pmONT - BWI

1 stop12h 07mFrontier

Deal found 3/24

$145

Sun 5/42:28 pmONT - IAD

1 stop13h 03mFrontier

Deal found 3/24

$145

Wed 5/284:45 pmONT - BWI

1 stop10h 44mAlaska Airlines

Deal found 3/25

$151

Thu 6/59:20 pmONT - BWI

Nonstop4h 50mSouthwest

Deal found 3/24

$154

Thu 4/106:00 amONT - IAD

1 stop8h 59mHawaiian Airlines

Deal found 3/24

$157

Wed 5/287:20 pmONT - IAD

1 stop9h 16mAlaska Airlines

Deal found 3/24

$161

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

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Thu 5/1

4:29 pm-5:46 am

1 stop10h 17m

Baltimore/Washington

Tue 5/6

7:06 am-3:32 pm

1 stop11h 26m

$272

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Thu 5/1

6:24 pm-5:46 am

1 stop8h 22m

Baltimore/Washington

Tue 5/6

7:06 am-3:32 pm

1 stop11h 26m

$273

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Sat 4/26

10:15 pm-9:12 am

1 stop7h 57m

Baltimore/Washington

Sat 5/3

2:04 pm-7:28 pm

1 stop8h 24m

$276

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Sun 4/6

12:59 am-11:27 am

1 stop7h 28m

Baltimore/Washington

Wed 4/9

8:49 pm-7:29 am

1 stop13h 40m

$278

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Sat 4/5

12:59 am-12:04 pm

1 stop8h 05m

Washington, D.C. Reagan-National

Tue 4/8

7:00 am-2:27 pm

1 stop10h 27m

$278

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Sun 5/11

10:15 pm-6:31 am

1 stop29h 16m

Washington, D.C. Dulles Intl

Sat 5/17

8:01 am-9:27 pm

1 stop16h 26m

$288

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Tue 4/8

6:00 am-6:15 pm

1 stop9h 15m

Baltimore/Washington

Mon 4/14

7:08 pm-11:50 pm

1 stop7h 42m

$301

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Fri 5/2

5:05 am-5:14 pm

2 stops9h 09m

Baltimore/Washington

Wed 5/7

6:45 am-2:25 pm

2 stops10h 40m

$322

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Wed 4/16

10:40 pm-8:38 am

1 stop6h 58m

Washington, D.C. Dulles Intl

Sun 4/20

6:18 am-11:45 am

1 stop8h 27m

$322

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Sat 4/26

10:15 pm-9:06 am

1 stop7h 51m

Washington, D.C. Reagan-National

Sat 5/3

6:00 am-10:57 am

1 stop7h 57m

$326

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/24

Showing 1-10 of 44 results

...

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 March.

Provider	Price Accuracy	Trust Score*
Expedia	Price Accuracy1 star	Trust Score*3 stars
FlightHub	Price Accuracy3 stars	Trust Score*3 stars
eDreams	Price Accuracy3 stars	Trust Score*3 stars
Priceline	Price Accuracy1 star	Trust Score*3 stars
Flightnetwork	Price Accuracy-	Trust Score*3 stars
CheapOair	Price Accuracy1 star	Trust Score*3 stars

*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.

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.

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 35 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

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

Currently, August is the cheapest month in which you can book a flight from Ontario to Washington, D.C. (average of $309). Flying from Ontario to Washington, D.C. in June is currently the most expensive (average of $387). 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?

It’s typically best to fly out from Ontario to Washington, D.C. in the afternoon. Doing so could potentially save you 32% on the flight price compared to flying at noon, which is usually more expensive.

What is the cheapest day to fly from Ontario to Washington, D.C.?

Travelers seeking maximum savings on their Ontario to Washington, D.C. flight should consider departing on Wednesday evenings when fares are most often at their lowest. Monday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

Rainfall in Washington, D.C. by month

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.

Temperature in Washington, D.C. by month

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).

Reviews of airlines servicing Washington, D.C.

Get a feel of what it's like to fly with Alaska Airlines, Southwest and Delta from Ontario to Washington, D.C. by reading reviews from past customers. In addition to providing an overall rating, users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Alaska Airlines

8.0

Very good

9,782 reviews

Reviews

1 / 20

10.0

Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them

Alaska Airlines

8.0

Very good

9,782 reviews

Alaska Airlines

8.0

Very good

9,782 reviews

Reviews

1 / 20

10.0

Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them

Southwest

8.0

Very good

4,272 reviews

Alaska Airlines

8.0

Very good

9,782 reviews

Reviews

1 / 20

10.0

Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them

Delta

8.0

Very good

7,890 reviews

Alaska Airlines

8.0

Very good

9,782 reviews

Reviews

1 / 20

10.0

Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them

Hawaiian Airlines

7.9

Good

2,330 reviews

Alaska Airlines

8.0

Very good

9,782 reviews

Reviews

1 / 20

10.0

Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them

United Airlines

7.4

Good

8,605 reviews

Alaska Airlines

8.0

Very good

9,782 reviews

Reviews

1 / 20

10.0

Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them

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.
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 $272. Other airlines that can offer you cheap pricing are Alaska Airlines, from $273, and Delta, from $276. Users have found that Hawaiian Airlines is 25% 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 American Airlines. According to our data, you can fly for as low as $102. Users have also found prices from $117 and $121 on United Airlines and Hawaiian 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 - Baltimore/Washington or Ontario - Washington, D.C. Reagan-National 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, August is the cheapest month in which you can book a flight from Ontario to Washington, D.C. (average of $309). Flying from Ontario to Washington, D.C. in June is currently the most expensive (average of $387). 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

Arlington

Alexandria

Fairfax

Tysons

Springfield

Rockville

Woodbridge

Gaithersburg

Fredericksburg

Linthicum Heights

Silver Spring

Falls Church

Laurel

Easton

Herndon

Bowie

Gettysburg

National Harbor

Oxon Hill

Reston

Browse thousands of different options on Cheapflights for your next trip

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

Airline	Cheapest	Average	Flexibility	On-time
Spirit Airlines	Cheapest$130	Average$212	FlexibilityNo cancel fee	On-time65%
Frontier	Cheapest$131	Average$297	FlexibilityNo cancel fee	On-time62%
United Airlines	Cheapest$256	Average$495	FlexibilityNo cancel fee	On-time69%
Delta	Cheapest$267	Average$419	FlexibilityNo cancel fee	On-timeN/A
American Airlines	Cheapest$286	Average$520	FlexibilityNo cancel fee	On-time71%
Southwest	Cheapest$321	Average$476	FlexibilityNo cancel fee	On-time63%

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$102+ 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 4/29. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Ontario to Washington, D.C. with Cheapflights

1. Tell us where you want to go

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3. Compare prices and book

Cheapflights Tip: The best prices from Ontario to Washington, D.C. are usually found in April or August, booked 35 days in advance, depart on a Wednesday or Thursday and return on a Tuesday

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

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Find 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 March 25, 2025.

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 March 25, 2025.

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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 March.

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.

Cheapflights Insights

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

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

Use this chart to determine the optimal time to book a round-trip flight from Ontario to Washington, D.C.. Price data was last updated on March 21, 2025.

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 March 25, 2025.

What is the cheapest day to fly from Ontario to Washington, D.C.?

Use this chart to determine the cheapest time to fly round-trip from Ontario to Washington, D.C.. Price data was last updated on March 23, 2025.

Rainfall in Washington, D.C. by month

Plan your trip to Washington, D.C. by taking into account the average rainfall totals by month.

Temperature in Washington, D.C. by month

Plan your trip to Washington, D.C. by taking into account the average temperature totals by month.

Reviews of airlines servicing Washington, D.C.

Related info for your journey

Find useful and relevant information for your journey from Ontario to Washington, D.C.. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

What airport do you fly from for flights 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.?

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Alternative routes for Ontario to Washington, D.C.

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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 March 25, 2025.