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 $176. Other airlines that can offer you cheap pricing are Alaska Airlines, from $292, and American Airlines, from $326. Users have found that Frontier is 52% 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 $87. Users have also found prices from $138 and $158 on Alaska Airlines and American 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 cheapest flights from Ontario to Washington, D.C.?

While on average a flight from Ontario to Washington, D.C. is generally $313, our data shows the cheapest flight currently is $188. When looking at the most popular route, (Ontario - Washington, D.C. Dulles Intl), you can expect to pay $188 for that flight.

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 80% 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 $397.

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 $358. You can even find prices in August for less than $358, 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 25%.

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.

$87+ Flights from Ontario to Washington, D.C.

Home Search by date Vacation packages Hotels Flight deals Car rental Travel tips & news

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 August or April, booked 70 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	$176 (Cheapflightsfares)
One-way from	$87 (Cheapflightsfares)
Popular in	June
Cheapest in	August
Average price	$286
Good round-trip deal	$376 or less
Good one-way deal	$196 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. 5% potential increase in price ($22 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 1% potential price decrease ($6 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in April 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 abril 11, 2025.

sáb 4/2612:10 pmONT - DCA

1 stop6h 49mFrontier

qua 4/307:00 amDCA - ONT

1 stop7h 20mFrontier

Deal found 4/11

$176

sáb 5/31:15 pmONT - IAD

1 stop14h 16mFrontier

sáb 5/107:45 amIAD - ONT

1 stop26h 39mFrontier

Deal found 4/10

$184

dom 4/1312:59 amONT - BWI

1 stop7h 28mFrontier

qua 4/165:18 pmBWI - ONT

1 stop9h 41mFrontier

Deal found 4/10

$188

sex 5/24:29 pmONT - BWI

1 stop10h 17mMultiple Airlines

seg 5/56:12 pmBWI - ONT

1 stop8h 47mMultiple Airlines

Deal found 4/10

$282

ter 5/207:20 pmONT - IAD

1 stop9h 16mAlaska Airlines

ter 6/39:00 amIAD - ONT

1 stop9h 50mAlaska Airlines

Deal found 4/10

$292

qui 5/14:29 pmONT - BWI

1 stop10h 17mAlaska Airlines

ter 5/67:06 amBWI - ONT

1 stop11h 26mAlaska Airlines

Deal found 4/10

$305

ter 7/14:50 pmONT - DCA

1 stop11h 10mAmerican Airlines

qua 7/95:00 amDCA - ONT

1 stop9h 56mAmerican Airlines

Deal found 4/10

$326

sáb 5/311:46 amONT - IAD

1 stop9h 12mHawaiian Airlines

ter 5/66:30 amIAD - ONT

1 stop12h 02mHawaiian Airlines

Deal found 4/10

$326

sáb 5/105:05 amONT - DCA

1 stop6h 57mUnited Airlines

seg 5/122:47 pmDCA - ONT

1 stop10h 13mUnited Airlines

Deal found 4/10

$327

ter 6/246:41 pmONT - IAD

1 stop7h 27mUnited Airlines

seg 6/303:00 pmIAD - ONT

1 stop10h 52mUnited Airlines

Deal found 4/9

$327

sáb 5/312:07 pmONT - DCA

1 stop8h 32mDelta

qua 5/76:00 amDCA - ONT

2 stops11h 15mDelta

Deal found 4/10

$332

sáb 5/107:05 pmONT - IAD

2 stops13h 11mDelta

ter 5/137:30 amIAD - ONT

1 stop7h 45mDelta

Deal found 4/9

$332

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 abril 11, 2025.

sáb 4/2612:10 pmONT - DCA

1 stop6h 49mFrontier

qua 4/307:00 amDCA - ONT

1 stop7h 20mFrontier

Deal found 4/11

$176

sex 5/24:29 pmONT - BWI

1 stop10h 17mMultiple Airlines

seg 5/56:12 pmBWI - ONT

1 stop8h 47mMultiple Airlines

Deal found 4/10

$282

ter 5/207:20 pmONT - IAD

1 stop9h 16mAlaska Airlines

ter 6/39:00 amIAD - ONT

1 stop9h 50mAlaska Airlines

Deal found 4/10

$292

ter 7/14:50 pmONT - DCA

1 stop11h 10mAmerican Airlines

qua 7/95:00 amDCA - ONT

1 stop9h 56mAmerican Airlines

Deal found 4/10

$326

sáb 5/105:05 amONT - DCA

1 stop6h 57mUnited Airlines

seg 5/122:47 pmDCA - ONT

1 stop10h 13mUnited Airlines

Deal found 4/10

$327

sáb 5/312:07 pmONT - DCA

1 stop8h 32mDelta

qua 5/76:00 amDCA - ONT

2 stops11h 15mDelta

Deal found 4/10

$332

qua 6/119:20 pmONT - BWI

Nonstop4h 50mSouthwest

sáb 6/148:55 pmBWI - ONT

Nonstop5h 20mSouthwest

Deal found 4/10

$337

qui 5/297:20 pmONT - IAD

1 stop9h 16mHawaiian Airlines

qui 6/59:00 amIAD - ONT

1 stop9h 50mHawaiian Airlines

Deal found 4/10

$361

sáb 5/31:15 pmONT - IAD

1 stop14h 16mFrontier

sáb 5/107:45 amIAD - ONT

1 stop26h 39mFrontier

Deal found 4/10

$184

dom 4/2712:59 amONT - BWI

1 stop12h 59mFrontier

sex 5/26:12 pmBWI - ONT

1 stop8h 47mFrontier

Deal found 4/10

$198

qui 5/14:29 pmONT - BWI

1 stop10h 17mAlaska Airlines

ter 5/67:06 amBWI - ONT

1 stop11h 26mAlaska Airlines

Deal found 4/10

$305

ter 6/246:41 pmONT - IAD

1 stop7h 27mUnited Airlines

seg 6/303:00 pmIAD - ONT

1 stop10h 52mUnited Airlines

Deal found 4/9

$327

Last-minute flights from Ontario to Washington, D.C.
Discover last-minute flight deals from Ontario to Washington, D.C.. Data last updated abril 11, 2025 and is based on user searches.

dom 4/1312:59 amONT - BWI

1 stop7h 28mFrontier

qua 4/165:18 pmBWI - ONT

1 stop9h 41mFrontier

Deal found 4/10

$188

qua 4/167:58 pmONT - BWI

1 stop12h 07mFrontier

seg 4/2112:17 pmBWI - ONT

1 stop26h 03mFrontier

Deal found 4/9

$198

qua 4/167:00 amONT - IAD

1 stop6h 37mDelta

sáb 4/197:35 amIAD - ONT

1 stop7h 41mDelta

Deal found 4/10

$599

sex 4/186:00 amONT - BWI

1 stop9h 03mAlaska Airlines

sáb 5/37:06 amBWI - ONT

1 stop11h 26mAlaska Airlines

Deal found 4/10

$492

sex 4/186:00 amONT - IAD

1 stop8h 59mAlaska Airlines

sáb 4/266:30 amIAD - ONT

1 stop12h 02mAlaska Airlines

Deal found 4/10

$536

sáb 4/195:44 pmONT - DCA

1 stop21h 14mAlaska Airlines

sex 4/256:35 pmDCA - ONT

2 stops23h 57mAlaska Airlines

Deal found 4/9

$571

sáb 4/196:00 amONT - IAD

1 stop10h 34mHawaiian Airlines

sáb 4/266:30 amIAD - ONT

1 stop12h 02mHawaiian Airlines

Deal found 4/10

$687

dom 4/2012:59 amONT - BWI

1 stop7h 28mMultiple Airlines

ter 5/207:49 amBWI - ONT

1 stop11h 01mMultiple Airlines

Deal found 4/10

$436

dom 4/205:00 amONT - IAD

1 stop7h 32mMultiple Airlines

sáb 4/266:30 amIAD - ONT

1 stop12h 02mMultiple Airlines

Deal found 4/10

$682

seg 4/2112:59 amONT - DCA

1 stop8h 10mFrontier

ter 4/297:00 amDCA - ONT

1 stop7h 20mFrontier

Deal found 4/10

$178

seg 4/217:25 pmONT - BWI

2 stops11h 14mAmerican Airlines

ter 5/207:18 pmBWI - ONT

1 stop7h 25mAmerican Airlines

Deal found 4/10

$528

seg 4/2111:59 pmONT - IAD

2 stops10h 43mAmerican Airlines

ter 5/205:07 pmIAD - ONT

1 stop9h 36mAmerican Airlines

Deal found 4/10

$556

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 abril 11, 2025.

qua 4/2312:10 pmONT - DCA

1 stop6h 49mFrontier

Deal found 4/10

$87

sáb 5/245:15 pmONT - IAD

1 stop9h 40mFrontier

Deal found 4/10

$89

qua 4/167:58 pmONT - BWI

1 stop12h 07mFrontier

Deal found 4/10

$95

seg 5/1910:52 amONT - BWI

1 stop16h 18mMultiple Airlines

Deal found 4/10

$119

qua 5/144:29 pmONT - BWI

1 stop10h 17mAlaska Airlines

Deal found 4/10

$138

ter 5/207:20 pmONT - IAD

1 stop9h 16mAlaska Airlines

Deal found 4/11

$146

ter 5/67:25 pmONT - BWI

2 stops11h 31mAmerican Airlines

Deal found 4/10

$158

ter 6/107:20 pmONT - IAD

1 stop9h 16mHawaiian Airlines

Deal found 4/10

$163

ter 5/136:00 amONT - DCA

1 stop7h 00mDelta

Deal found 4/10

$164

sex 6/610:00 pmONT - IAD

1 stop9h 50mDelta

Deal found 4/10

$164

sáb 6/79:20 pmONT - BWI

Nonstop4h 50mSouthwest

Deal found 4/10

$169

ter 6/105:45 pmONT - BWI

2 stops15h 02mDelta

Deal found 4/10

$172

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

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

sáb 4/26

12:10 pm-9:59 pm

1 stop6h 49m

Washington, D.C. Reagan-National

qua 4/30

7:00 am-11:20 am

1 stop7h 20m

$176

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

sáb 5/3

1:15 pm-6:31 am

1 stop14h 16m

Washington, D.C. Dulles Intl

sáb 5/10

7:45 am-7:24 am

1 stop26h 39m

$184

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

dom 4/27

12:59 am-4:58 pm

1 stop12h 59m

Baltimore/Washington

sex 5/2

6:12 pm-11:59 pm

1 stop8h 47m

$198

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

sex 5/2

4:29 pm-5:46 am

1 stop10h 17m

Baltimore/Washington

seg 5/5

6:12 pm-11:59 pm

1 stop8h 47m

$282

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

ter 5/20

7:20 pm-7:36 am

1 stop9h 16m

Washington, D.C. Dulles Intl

ter 6/3

9:00 am-3:50 pm

1 stop9h 50m

$292

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

qui 5/1

4:29 pm-5:46 am

1 stop10h 17m

Baltimore/Washington

ter 5/6

7:06 am-3:32 pm

1 stop11h 26m

$305

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

ter 7/1

4:50 pm-7:00 am

1 stop11h 10m

Washington, D.C. Reagan-National

qua 7/9

5:00 am-11:56 am

1 stop9h 56m

$326

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

sáb 5/3

11:46 am-11:58 pm

1 stop9h 12m

Washington, D.C. Dulles Intl

ter 5/6

6:30 am-3:32 pm

1 stop12h 02m

$326

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

sáb 5/10

5:05 am-3:02 pm

1 stop6h 57m

Washington, D.C. Reagan-National

seg 5/12

2:47 pm-10:00 pm

1 stop10h 13m

$327

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

ter 6/24

6:41 pm-5:08 am

1 stop7h 27m

Washington, D.C. Dulles Intl

seg 6/30

3:00 pm-10:52 pm

1 stop10h 52m

$327

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/10

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 April.

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 45 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 $241). Flying from Ontario to Washington, D.C. in March is currently the most expensive (average of $290). 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

9,851 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

9,851 reviews

Alaska Airlines

8.0

Very good

9,851 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

4,279 reviews

Alaska Airlines

8.0

Very good

9,851 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

7,911 reviews

Alaska Airlines

8.0

Very good

9,851 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

2,365 reviews

Alaska Airlines

8.0

Very good

9,851 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

8,636 reviews

Alaska Airlines

8.0

Very good

9,851 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 $176. Other airlines that can offer you cheap pricing are Alaska Airlines, from $292, and American Airlines, from $326. Users have found that Frontier is 52% 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 $87. Users have also found prices from $138 and $158 on Alaska Airlines and American 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 cheapest flights from Ontario to Washington, D.C.?
While on average a flight from Ontario to Washington, D.C. is generally $313, our data shows the cheapest flight currently is $188. When looking at the most popular route, (Ontario - Washington, D.C. Dulles Intl), you can expect to pay $188 for that flight.
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 $241). Flying from Ontario to Washington, D.C. in March is currently the most expensive (average of $290). 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

Fredericksburg

Woodbridge

Gaithersburg

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$210	FlexibilityNo cancel fee	On-time65%
Frontier	Cheapest$132	Average$297	FlexibilityNo cancel fee	On-time62%
United Airlines	Cheapest$256	Average$480	FlexibilityNo cancel fee	On-time69%
Delta	Cheapest$286	Average$430	FlexibilityNo cancel fee	On-timeN/A
American Airlines	Cheapest$286	Average$520	FlexibilityNo cancel fee	On-time71%
Southwest	Cheapest$321	Average$477	FlexibilityNo cancel fee	On-time63%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.

$87+ 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 4/23. 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

2. Select your favorite providers

3. Compare prices and book

Cheapflights Tip: The best prices from Ontario to Washington, D.C. are usually found in August or April, booked 70 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

Most trusted provider

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Good round-trip deal

Good one-way deal

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 abril 11, 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 abril 11, 2025.

Cheapflights Fare Finder

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 April.

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 April 4, 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 abril 11, 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 30, 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.?

What are the cheapest flights 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 Ontario?

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Ontario to Washington, D.C.

See prices for flight routes from nearby airports that may be better suited for you.

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

100% Free

Book with Flexibility

Travel Smart

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 abril 11, 2025.