What are the cheapest airlines to fly from Ontario to District of Columbia one-way?

For one-way options, check prices for Frontier. According to our data, you can fly for as low as $83. Users have also found prices from $145 and $146 on Hawaiian Airlines and Alaska Airlines, respectively.

What are the cheapest flights from Ontario to District of Columbia?

Looking at all options, your cheapest flight can be booked for $168. While the most popular route (Ontario - Washington, D.C. Dulles Intl) can be booked for $189 on average our data indicates $291 when flying from Ontario to District of Columbia.

What are the most popular airlines that fly from Ontario to District of Columbia?

American Airlines, Delta and Frontier are the most popular airlines when flying from Ontario to District of Columbia.

How far in advance should I book a flight from Ontario to District of Columbia?

Find a great deal and save up to 75% 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 District of Columbia within the next two weeks, with the cheapest ticket starting at $390.

What is the cheapest month to fly from Ontario to District of Columbia?

Our data shows that August tends to be the cheapest month to fly to District of Columbia from Ontario. Users have commonly found prices around $356 for the month, but tickets can be as low as $131. Due to multiple factors, prepare for potentially higher prices in December.

What airport do you fly from for flights from Ontario to District of Columbia?

Ontario (ONT) is the airport you will fly out of if you book a flight from Ontario to District of Columbia. It is only a 3.1 mi journey to Ontario (ONT) from Ontario’s city center.

Can I find deals for flights from Ontario to District of Columbia that include hotel bookings?

Yes. In addition to deals on Ontario to District of Columbia flights, Cheapflights offers vacation packages that include both flights and hotel.

How can I find direct flights from Ontario to District of Columbia?

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

Can I find deals for business class flights from Ontario to District of Columbia?

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

$83+ Flights from Ontario to District of Columbia

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Cheap flight deals from Ontario to District of Columbia

Most accurate provider	Mytrip 3 stars
Most trusted provider	Mytrip 3 stars
Round-trip from	$176 (Cheapflightsfares)
One-way from	$83 (Cheapflightsfares)
Popular in	December
Cheapest in	August
Average price	$357

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

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

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From Ontario to District of Columbia

Search Deals

One-way flight from Ontario to District of Columbia

Search Deals

Highest demand for flights based on searches. 10% potential increase in price ($40 potential increase over avg. RT price).

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Cheapest flight prices on average. 2% potential price decrease ($8 potential savings vs. average RT price).

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Average for round-trip flights in April 2025

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Find flight deals from Ontario to District of Columbia

Cheapest flights from Ontario to District of Columbia
Explore the most affordable flight options available from Ontario to District of Columbia. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 15, 2025.

Tue 4/2212:10 pmONT - DCA

1 stop6h 49mFrontier

Sat 4/267:00 amDCA - ONT

1 stop7h 20mFrontier

Deal found 4/15

$176

Sat 5/101:15 pmONT - IAD

1 stop14h 16mFrontier

Sat 5/177:45 amIAD - ONT

1 stop26h 39mFrontier

Deal found 4/15

$178

Tue 4/296:00 amONT - IAD

1 stop9h 13mAlaska Airlines

Tue 9/307:00 amIAD - ONT

1 stop10h 06mAlaska Airlines

Deal found 4/15

$295

Wed 5/287:00 amONT - DCA

1 stop8h 02mUnited Airlines

Tue 6/35:00 pmDCA - ONT

1 stop8h 26mUnited Airlines

Deal found 4/15

$322

Thu 5/811:46 amONT - IAD

1 stop9h 37mHawaiian Airlines

Tue 5/136:30 amIAD - ONT

1 stop12h 02mHawaiian Airlines

Deal found 4/14

$326

Wed 5/72:44 pmONT - DCA

1 stop7h 02mAmerican Airlines

Thu 5/811:54 amDCA - ONT

1 stop9h 42mAmerican Airlines

Deal found 4/15

$327

Sat 5/101:10 pmONT - IAD

1 stop7h 43mDelta

Tue 6/103:31 pmIAD - ONT

1 stop9h 54mDelta

Deal found 4/15

$327

Wed 5/76:00 amONT - DCA

2 stops8h 59mDelta

Thu 5/86:59 amDCA - ONT

1 stop7h 09mDelta

Deal found 4/15

$332

Wed 5/75:30 amONT - DCA

2 stops12h 25mSouthwest

Thu 5/86:55 amDCA - ONT

1 stop7h 10mSouthwest

Deal found 4/15

$338

Mon 9/111:02 pmONT - IAD

1 stop6h 42mAmerican Airlines

Wed 9/107:09 amIAD - ONT

2 stops10h 42mAmerican Airlines

Deal found 4/15

$358

Wed 5/711:25 amONT - IAD

2 stops8h 10mSouthwest

Thu 5/86:40 pmIAD - ONT

1 stop7h 20mSouthwest

Deal found 4/15

$367

Thu 5/296:00 amONT - DCA

1 stop12h 59mAlaska Airlines

Sat 8/235:40 pmDCA - ONT

1 stop9h 19mAlaska Airlines

Deal found 4/14

$401

Best flights from Ontario to District of Columbia
Discover carefully curated flight deals from Ontario to District of Columbia that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated April 15, 2025.

Sat 4/2612:10 pmONT - DCA

1 stop6h 49mFrontier

Tue 4/297:00 amDCA - ONT

1 stop7h 20mFrontier

Deal found 4/15

$176

Tue 4/296:00 amONT - IAD

1 stop9h 13mAlaska Airlines

Tue 9/307:00 amIAD - ONT

1 stop10h 06mAlaska Airlines

Deal found 4/15

$295

Wed 5/287:00 amONT - DCA

1 stop8h 02mUnited Airlines

Tue 6/35:00 pmDCA - ONT

1 stop8h 26mUnited Airlines

Deal found 4/15

$322

Thu 5/811:46 amONT - IAD

1 stop9h 37mHawaiian Airlines

Tue 5/136:30 amIAD - ONT

1 stop12h 02mHawaiian Airlines

Deal found 4/14

$326

Wed 5/77:30 amONT - DCA

1 stop9h 12mAmerican Airlines

Thu 5/811:54 amDCA - ONT

1 stop9h 42mAmerican Airlines

Deal found 4/15

$327

Sat 5/101:10 pmONT - IAD

1 stop7h 43mDelta

Tue 6/103:31 pmIAD - ONT

1 stop9h 54mDelta

Deal found 4/15

$327

Wed 5/75:30 amONT - DCA

2 stops12h 25mSouthwest

Thu 5/86:55 amDCA - ONT

1 stop7h 10mSouthwest

Deal found 4/15

$338

Sat 5/101:15 pmONT - IAD

1 stop14h 16mFrontier

Sat 5/177:45 amIAD - ONT

1 stop26h 39mFrontier

Deal found 4/15

$178

Wed 7/212:59 amONT - DCA

1 stop8h 01mMultiple Airlines

Mon 7/215:43 pmDCA - ONT

1 stop9h 16mMultiple Airlines

Deal found 4/15

$579

Wed 5/76:00 amONT - DCA

2 stops8h 59mDelta

Thu 5/86:59 amDCA - ONT

1 stop7h 09mDelta

Deal found 4/15

$332

Mon 9/111:02 pmONT - IAD

1 stop6h 42mAmerican Airlines

Wed 9/107:09 amIAD - ONT

2 stops10h 42mAmerican Airlines

Deal found 4/15

$358

Wed 5/711:25 amONT - IAD

2 stops8h 10mSouthwest

Thu 5/86:40 pmIAD - ONT

1 stop7h 20mSouthwest

Deal found 4/15

$367

Last-minute flights from Ontario to District of Columbia
Discover last-minute flight deals from Ontario to District of Columbia. Data last updated April 15, 2025 and is based on user searches.

Sun 4/205:00 amONT - DCA

1 stop7h 01mMultiple Airlines

Wed 4/235:10 pmDCA - ONT

1 stop9h 48mMultiple Airlines

Deal found 4/15

$817

Mon 4/214:23 pmONT - IAD

1 stop9h 59mUnited Airlines

Mon 4/284:00 pmIAD - ONT

1 stop7h 42mUnited Airlines

Deal found 4/14

$696

Tue 4/2212:10 pmONT - DCA

1 stop6h 49mFrontier

Sat 4/267:00 amDCA - ONT

1 stop7h 20mFrontier

Deal found 4/15

$176

Wed 4/236:00 amONT - DCA

1 stop9h 10mSouthwest

Wed 4/303:50 pmDCA - ONT

2 stops8h 55mSouthwest

Deal found 4/14

$594

Thu 4/246:24 pmONT - IAD

1 stop10h 19mAlaska Airlines

Sat 5/36:30 amIAD - ONT

1 stop12h 02mAlaska Airlines

Deal found 4/15

$536

Thu 4/2411:46 amONT - IAD

1 stop9h 37mHawaiian Airlines

Sun 5/259:00 amIAD - ONT

1 stop9h 50mHawaiian Airlines

Deal found 4/15

$585

Thu 4/241:35 pmONT - IAD

1 stop6h 39mMultiple Airlines

Sat 5/36:30 amIAD - ONT

1 stop12h 02mMultiple Airlines

Deal found 4/14

$627

Thu 4/249:00 amONT - IAD

2 stops10h 40mSouthwest

Sat 5/35:05 amIAD - ONT

2 stops13h 30mSouthwest

Deal found 4/14

$672

Thu 4/246:00 amONT - DCA

2 stops13h 15mAlaska Airlines

Sat 4/268:00 amDCA - ONT

1 stop10h 32mAlaska Airlines

Deal found 4/15

$807

Thu 4/246:10 amONT - DCA

1 stop6h 51mUnited Airlines

Mon 5/124:37 pmDCA - ONT

1 stop8h 23mUnited Airlines

Deal found 4/15

$1,512

Fri 4/2510:15 pmONT - IAD

2 stops10h 16mDelta

Sun 4/277:35 amIAD - ONT

1 stop7h 41mDelta

Deal found 4/15

$780

Tue 4/296:00 amONT - IAD

1 stop9h 13mAlaska Airlines

Tue 9/307:00 amIAD - ONT

1 stop10h 06mAlaska Airlines

Deal found 4/15

$295

One-way flights from Ontario to District of Columbia
Search for one-way flight options from Ontario to District of Columbia. Find affordable one-way fares based on user searches. Data last updated April 15, 2025.

Wed 4/3012:10 pmONT - DCA

1 stop6h 49mFrontier

Deal found 4/15

$83

Sat 5/245:15 pmONT - IAD

1 stop9h 40mFrontier

Deal found 4/15

$89

Tue 7/86:58 pmONT - IAD

1 stop9h 29mHawaiian Airlines

Deal found 4/15

$145

Wed 5/287:20 pmONT - IAD

1 stop9h 16mAlaska Airlines

Deal found 4/15

$146

Wed 6/47:00 amONT - DCA

1 stop8h 02mUnited Airlines

Deal found 4/15

$159

Tue 5/612:07 pmONT - DCA

1 stop6h 29mDelta

Deal found 4/15

$164

Mon 6/210:00 pmONT - IAD

1 stop8h 14mDelta

Deal found 4/15

$164

Sun 6/156:41 pmONT - IAD

1 stop9h 38mUnited Airlines

Deal found 4/15

$171

Wed 8/68:35 amONT - DCA

2 stops8h 40mSouthwest

Deal found 4/15

$195

Fri 7/45:45 amONT - IAD

2 stops13h 25mSouthwest

Deal found 4/15

$201

Thu 5/2910:00 amONT - IAD

2 stops9h 57mAmerican Airlines

Deal found 4/15

$205

Thu 7/3112:59 amONT - DCA

1 stop7h 06mAmerican Airlines

Deal found 4/15

$210

Cheapflights Fare Finder

Use the filters below to find and compare flights from Ontario to District of Columbia that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Sat 4/26

12:10 pm-9:59 pm

1 stop6h 49m

Washington, D.C. Reagan-National

Tue 4/29

7:00 am-11:20 am

1 stop7h 20m

$176

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Sat 5/10

1:15 pm-6:31 am

1 stop14h 16m

Washington, D.C. Dulles Intl

Sat 5/17

7:45 am-7:24 am

1 stop26h 39m

$178

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Tue 4/29

6:00 am-6:13 pm

1 stop9h 13m

Washington, D.C. Dulles Intl

Tue 5/6

6:30 am-3:32 pm

1 stop12h 02m

$295

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Wed 5/28

7:00 am-6:02 pm

1 stop8h 02m

Washington, D.C. Reagan-National

Tue 6/3

5:00 pm-10:26 pm

1 stop8h 26m

$322

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Thu 5/8

11:46 am-12:23 am

1 stop9h 37m

Washington, D.C. Dulles Intl

Tue 5/13

6:30 am-3:32 pm

1 stop12h 02m

$326

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Wed 5/7

2:44 pm-12:46 am

1 stop7h 02m

Washington, D.C. Reagan-National

Thu 5/8

11:54 am-6:36 pm

1 stop9h 42m

$327

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Sat 5/10

1:10 pm-11:53 pm

1 stop7h 43m

Washington, D.C. Dulles Intl

Tue 6/10

3:31 pm-10:25 pm

1 stop9h 54m

$327

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Wed 5/7

6:00 am-5:59 pm

2 stops8h 59m

Washington, D.C. Reagan-National

Thu 5/8

6:59 am-11:08 am

1 stop7h 09m

$332

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Wed 5/7

5:30 am-8:55 pm

2 stops12h 25m

Washington, D.C. Reagan-National

Thu 5/8

6:55 am-11:05 am

1 stop7h 10m

$338

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Mon 9/1

11:02 pm-8:44 am

1 stop6h 42m

Washington, D.C. Dulles Intl

Wed 9/10

7:09 am-2:51 pm

2 stops10h 42m

$358

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/15

Showing 1-10 of 27 results

Best time to book a flight from Ontario to District of Columbia

Have a flexible travel schedule? Discover the best time to fly to District of Columbia 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 District of Columbia

What is the cheapest month to book a flight from Ontario to District of Columbia?

Currently, August is the cheapest month in which you can book a flight from Ontario to District of Columbia (average of $241). Flying from Ontario to District of Columbia 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 DC?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Ontario to District of Columbia as you normally would.

Rainfall in District of Columbia by month

In terms of precipitation, rainfall in District of Columbia 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 District of Columbia when rainfall is around 2.6 in.

Temperature in District of Columbia by month

If weather is an important factor for your trip to District of Columbia, 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 District of Columbia

Get a feel of what it's like to fly with Alaska Airlines, Southwest and Delta from Ontario to District of Columbia 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

9,871 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

9,871 reviews

Alaska Airlines

8.0

Very good

9,871 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

9,871 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

7,918 reviews

Alaska Airlines

8.0

Very good

9,871 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

2,375 reviews

Alaska Airlines

8.0

Very good

9,871 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

8,658 reviews

Alaska Airlines

8.0

Very good

9,871 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 District of Columbia?
Ontario (ONT) is the airport you will fly out of if you book a flight from Ontario to District of Columbia. It is only a 3.1 mi journey to Ontario (ONT) from Ontario’s city center.
What are the cheapest airlines to fly from Ontario to District of Columbia one-way?
For one-way options, check prices for Frontier. According to our data, you can fly for as low as $83. Users have also found prices from $145 and $146 on Hawaiian Airlines and Alaska Airlines, respectively.
What are the cheapest flights from Ontario to District of Columbia?
Looking at all options, your cheapest flight can be booked for $168. While the most popular route (Ontario - Washington, D.C. Dulles Intl) can be booked for $189 on average our data indicates $291 when flying from Ontario to District of Columbia.
Can I find deals for flights from Ontario to District of Columbia that include hotel bookings?
Yes. In addition to deals on Ontario to District of Columbia flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Ontario to District of Columbia?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ontario to District of Columbia.
Can I find deals for business class flights from Ontario to District of Columbia?
Yes. Cheapflights offers flight deals from Ontario to District of Columbia 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 District of Columbia?
Currently, August is the cheapest month in which you can book a flight from Ontario to District of Columbia (average of $241). Flying from Ontario to District of Columbia 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

Browse thousands of different options on Cheapflights for your next trip

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Top 6 airlines flying from Ontario to District of Columbia

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%

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$83+ Cheap flights from Ontario (ONT) to District of Columbia

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 4/30. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Ontario to District of Columbia with Cheapflights

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Cheap flight deals from Ontario to District of Columbia

Keep the following information in mind while searching for Ontario to District of Columbia flight deals. Data was last updated April 15, 2025.

Most accurate provider

Most trusted provider

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Find flight deals from Ontario to District of Columbia

Cheapest flights from Ontario to District of ColumbiaExplore the most affordable flight options available from Ontario to District of Columbia. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 15, 2025.

Explore the most affordable flight options available from Ontario to District of Columbia. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 15, 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from Ontario to District of Columbia that are best for you.

Best time to book a flight from Ontario to District of Columbia

Have a flexible travel schedule? Discover the best time to fly to District of Columbia from Ontario with our price prediction graph.

Cheapflights Insights

Everything you need to know about your flight from Ontario to District of Columbia

What is the cheapest month to book a flight from Ontario to District of Columbia?

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

Find hourly flight availability from Ontario to District of Columbia. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated April 15, 2025.

Rainfall in District of Columbia by month

Plan your trip to District of Columbia by taking into account the average rainfall totals by month.

Temperature in District of Columbia by month

Plan your trip to District of Columbia by taking into account the average temperature totals by month.

Reviews of airlines servicing District of Columbia

Related info for your journey

Find useful and relevant information for your journey from Ontario to District of Columbia. 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 District of Columbia?

What are the cheapest airlines to fly from Ontario to District of Columbia one-way?

What are the cheapest flights from Ontario to District of Columbia?

Can I find deals for flights from Ontario to District of Columbia that include hotel bookings?

How can I find direct flights from Ontario to District of Columbia?

Can I find deals for business class flights from Ontario to District of Columbia?

What is the cheapest month to book a flight from Ontario to District of Columbia?

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 District of Columbia

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

Top 6 airlines flying from Ontario to District of Columbia

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Cheapest flights from Ontario to District of Columbia
Explore the most affordable flight options available from Ontario to District of Columbia. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 15, 2025.