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 $140. Other airlines that can offer you cheap pricing are Delta, from $327, and American Airlines, from $337. Users have found that Frontier is 60% 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 $61. Users have also found prices from $161 and $163 on Hawaiian Airlines and Alaska Airlines, respectively.

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 61 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 $389). 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 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.

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 - 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 73% 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 $363. You can even find prices in August for less than $363, 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%.

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.

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 7 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.

$61+ 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.

The best prices from Ontario to Washington, D.C. are usually found in April or August, booked 61 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	$140 (Booking.com)
One-way from	$61 (Trip.com)
Popular in	June
Cheapest in	April
Average price	$389
Good round-trip deal	$586 or less

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

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

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

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

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Highest demand for flights based on searches. 5% potential increase in price ($18 potential increase over avg. RT price).

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Cheapest flight prices on average. 1% potential price decrease ($8 potential savings vs. average RT price).

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Average for round-trip flights in February 2025

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

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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 February 11, 2025.

Tue 4/112:59 amONT - BWI

1 stop12h 29mFrontier

Mon 4/712:17 pmBWI - ONT

1 stop14h 42mFrontier

Deal found 2/10

$140

Mon 2/2412:59 amONT - DCA

1 stop8h 04mFrontier

Sat 3/11:03 pmDCA - ONT

1 stop14h 06mFrontier

Deal found 2/9

$150

Thu 5/16:35 pmONT - IAD

1 stop8h 56mFrontier

Thu 5/88:01 amIAD - ONT

1 stop12h 44mFrontier

Deal found 2/11

$180

Wed 4/3010:15 pmONT - BWI

1 stop7h 57mDelta

Tue 5/612:00 pmBWI - ONT

1 stop10h 28mDelta

Deal found 2/11

$327

Wed 3/126:00 amONT - DCA

1 stop12h 59mMultiple Airlines

Wed 3/191:03 pmDCA - ONT

1 stop14h 01mMultiple Airlines

Deal found 2/10

$327

Wed 3/51:10 pmONT - IAD

1 stop8h 10mDelta

Tue 3/116:00 amIAD - ONT

1 stop8h 36mDelta

Deal found 2/10

$327

Thu 3/1312:46 pmONT - DCA

1 stop7h 54mDelta

Mon 3/174:40 pmDCA - ONT

2 stops10h 16mDelta

Deal found 2/10

$332

Wed 3/197:35 pmONT - BWI

2 stops10h 55mAmerican Airlines

Wed 3/261:59 pmBWI - ONT

2 stops11h 01mAmerican Airlines

Deal found 2/10

$337

Fri 3/146:00 amONT - BWI

1 stop8h 56mMultiple Airlines

Mon 3/1712:30 pmBWI - ONT

1 stop14h 29mMultiple Airlines

Deal found 2/9

$340

Wed 4/3011:46 amONT - IAD

1 stop9h 12mAlaska Airlines

Tue 5/66:30 amIAD - ONT

1 stop12h 02mAlaska Airlines

Deal found 2/10

$361

Thu 5/16:24 pmONT - BWI

1 stop8h 22mAlaska Airlines

Tue 5/67:06 amBWI - ONT

1 stop11h 26mAlaska Airlines

Deal found 2/9

$362

Wed 3/199:32 amONT - IAD

2 stops11h 26mAmerican Airlines

Wed 3/2611:46 amIAD - ONT

2 stops9h 47mAmerican Airlines

Deal found 2/10

$366

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 February 11, 2025.

Tue 4/112:59 amONT - BWI

1 stop12h 29mFrontier

Mon 4/712:17 pmBWI - ONT

1 stop14h 42mFrontier

Deal found 2/10

$140

Mon 2/2412:59 amONT - DCA

1 stop8h 04mFrontier

Sat 3/11:03 pmDCA - ONT

1 stop14h 06mFrontier

Deal found 2/9

$150

Wed 4/3010:15 pmONT - BWI

1 stop7h 57mDelta

Tue 5/612:00 pmBWI - ONT

1 stop10h 28mDelta

Deal found 2/11

$327

Wed 3/126:00 amONT - DCA

1 stop12h 59mMultiple Airlines

Wed 3/191:03 pmDCA - ONT

1 stop14h 01mMultiple Airlines

Deal found 2/10

$327

Wed 3/197:35 pmONT - BWI

2 stops10h 55mAmerican Airlines

Wed 3/261:59 pmBWI - ONT

2 stops11h 01mAmerican Airlines

Deal found 2/10

$337

Wed 4/3011:46 amONT - IAD

1 stop9h 12mAlaska Airlines

Tue 5/66:30 amIAD - ONT

1 stop12h 02mAlaska Airlines

Deal found 2/10

$361

Mon 3/39:40 amONT - DCA

2 stops8h 15mSouthwest

Wed 3/56:55 amDCA - ONT

1 stop7h 35mSouthwest

Deal found 2/10

$367

Wed 4/163:55 pmONT - BWI

2 stops10h 29mUnited Airlines

Fri 4/1810:00 amBWI - ONT

2 stops13h 21mUnited Airlines

Deal found 2/10

$388

Thu 5/16:35 pmONT - IAD

1 stop8h 56mFrontier

Thu 5/88:01 amIAD - ONT

1 stop12h 44mFrontier

Deal found 2/11

$180

Fri 4/256:24 pmONT - IAD

1 stop10h 19mHawaiian Airlines

Sun 4/276:30 amIAD - ONT

1 stop12h 02mHawaiian Airlines

Deal found 2/10

$597

Wed 3/51:10 pmONT - IAD

1 stop8h 10mDelta

Tue 3/116:00 amIAD - ONT

1 stop8h 36mDelta

Deal found 2/10

$327

Fri 3/146:00 amONT - BWI

1 stop8h 56mMultiple Airlines

Mon 3/1712:30 pmBWI - ONT

1 stop14h 29mMultiple Airlines

Deal found 2/9

$340

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

Mon 2/1712:59 amONT - DCA

1 stop8h 04mFrontier

Tue 2/251:03 pmDCA - ONT

1 stop13h 56mFrontier

Deal found 2/11

$175

Mon 2/172:54 pmONT - DCA

1 stop6h 51mAmerican Airlines

Fri 2/2112:57 pmDCA - ONT

1 stop8h 38mAmerican Airlines

Deal found 2/10

$734

Tue 2/185:05 amONT - DCA

1 stop6h 54mUnited Airlines

Wed 2/194:14 pmDCA - ONT

1 stop7h 38mUnited Airlines

Deal found 2/10

$427

Tue 2/181:44 pmONT - BWI

1 stop6h 37mUnited Airlines

Wed 2/194:02 pmBWI - ONT

1 stop7h 50mUnited Airlines

Deal found 2/10

$459

Tue 2/186:00 amONT - BWI

1 stop8h 56mAlaska Airlines

Fri 2/286:56 pmBWI - ONT

1 stop19h 06mAlaska Airlines

Deal found 2/9

$562

Wed 2/191:05 pmONT - DCA

1 stop6h 34mDelta

Sat 2/226:00 amDCA - ONT

1 stop8h 55mDelta

Deal found 2/9

$327

Wed 2/191:21 pmONT - IAD

1 stop7h 13mDelta

Sat 2/225:57 pmIAD - ONT

1 stop7h 55mDelta

Deal found 2/9

$327

Wed 2/197:05 amONT - BWI

1 stop7h 31mDelta

Sat 2/226:00 amBWI - ONT

1 stop8h 55mDelta

Deal found 2/9

$359

Wed 2/1912:59 amONT - DCA

1 stop8h 04mMultiple Airlines

Sun 2/238:00 amDCA - ONT

2 stops18h 58mMultiple Airlines

Deal found 2/10

$583

Wed 2/196:00 amONT - IAD

1 stop8h 48mAlaska Airlines

Sun 2/236:48 pmIAD - ONT

1 stop19h 14mAlaska Airlines

Deal found 2/10

$633

Thu 2/208:30 amONT - DCA

2 stops9h 05mSouthwest

Sun 2/234:45 pmDCA - ONT

2 stops10h 10mSouthwest

Deal found 2/10

$672

Thu 2/205:05 amONT - IAD

1 stop10h 52mUnited Airlines

Tue 2/2510:00 amIAD - ONT

1 stop13h 52mUnited Airlines

Deal found 2/10

$693

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 February 11, 2025.

Tue 3/2512:59 amONT - DCA

1 stop18h 00mFrontier

Deal found 2/10

$61

Sat 4/128:39 amONT - BWI

1 stop7h 45mFrontier

Deal found 2/11

$65

Thu 5/16:35 pmONT - IAD

1 stop8h 56mFrontier

Deal found 2/11

$90

Wed 2/196:00 amONT - IAD

1 stop8h 48mHawaiian Airlines

Deal found 2/11

$161

Thu 5/86:24 pmONT - BWI

1 stop8h 22mAlaska Airlines

Deal found 2/10

$163

Wed 2/192:54 pmONT - DCA

1 stop6h 51mAmerican Airlines

Deal found 2/10

$163

Thu 3/66:00 amONT - IAD

1 stop8h 48mAlaska Airlines

Deal found 2/10

$163

Mon 3/31:21 pmONT - BWI

1 stop7h 11mDelta

Deal found 2/10

$164

Wed 2/196:00 amONT - DCA

1 stop7h 00mDelta

Deal found 2/10

$164

Wed 3/126:00 amONT - DCA

2 stops13h 42mUnited Airlines

Deal found 2/10

$169

Tue 2/181:21 pmONT - IAD

1 stop7h 13mDelta

Deal found 2/10

$174

Sat 5/106:01 amONT - BWI

2 stops10h 26mAmerican Airlines

Deal found 2/9

$185

Find flights from Ontario to Washington, D.C. within your budget

Fly from

Fly to

Route

Depart

Return

Price

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Tue 4/1

12:59 am-4:28 pm

1 stop12h 29m

Baltimore/Washington

Mon 4/7

12:17 pm-11:59 pm

1 stop14h 42m

$140

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Mon 2/24

12:59 am-12:03 pm

1 stop8h 04m

Washington, D.C. Reagan-National

Sat 3/1

1:03 pm-12:09 am

1 stop14h 06m

$150

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Thu 5/1

6:35 pm-6:31 am

1 stop8h 56m

Washington, D.C. Dulles Intl

Thu 5/8

8:01 am-5:45 pm

1 stop12h 44m

$180

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Wed 4/30

10:15 pm-9:12 am

1 stop7h 57m

Baltimore/Washington

Tue 5/6

12:00 pm-7:28 pm

1 stop10h 28m

$327

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Wed 3/12

6:00 am-9:59 pm

1 stop12h 59m

Washington, D.C. Reagan-National

Wed 3/19

1:03 pm-12:04 am

1 stop14h 01m

$327

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Wed 3/5

1:10 pm-12:20 am

1 stop8h 10m

Washington, D.C. Dulles Intl

Tue 3/11

6:00 am-11:36 am

1 stop8h 36m

$327

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Thu 3/13

12:46 pm-11:40 pm

1 stop7h 54m

Washington, D.C. Reagan-National

Mon 3/17

4:40 pm-11:56 pm

2 stops10h 16m

$332

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Wed 3/19

7:35 pm-9:30 am

2 stops10h 55m

Baltimore/Washington

Wed 3/26

1:59 pm-10:00 pm

2 stops11h 01m

$337

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Fri 3/14

6:00 am-5:56 pm

1 stop8h 56m

Baltimore/Washington

Mon 3/17

12:30 pm-11:59 pm

1 stop14h 29m

$340

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Wed 4/30

11:46 am-11:58 pm

1 stop9h 12m

Washington, D.C. Dulles Intl

Tue 5/6

6:30 am-3:32 pm

1 stop12h 02m

$361

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/10

Showing 1-10 of 40 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 February.

Provider	Price Accuracy	Trust Score*
Expedia	Price Accuracy1 star	Trust Score*3 stars
FlightHub	Price Accuracy3 stars

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 3/25. 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

The best prices from Ontario to Washington, D.C. are usually found in April or August, booked 61 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

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 February 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 February 11, 2025.

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 February 11, 2025.

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 February 11, 2025.

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

Discover last-minute flight deals from Ontario to Washington, D.C.. Data last updated February 11, 2025 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 February 11, 2025.

Search for one-way flight options from Ontario to Washington, D.C.. Find affordable one-way fares based on user searches. Data last updated February 11, 2025.

Find flights from Ontario to Washington, D.C. within your budget

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 February.

$61+ 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 3/25. 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

The best prices from Ontario to Washington, D.C. are usually found in April or August, booked 61 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

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 February 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 February 11, 2025.

Find flights from Ontario to Washington, D.C. within your budget

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 February.

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 February 11, 2025.