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 $127. Users have also found prices from $157 and $161 on Hawaiian Airlines and Alaska Airlines, respectively.

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 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 District of Columbia within the next two weeks, with the cheapest ticket starting at $392.

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 $362 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.

$127+ Flights from Ontario to District of Columbia

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Cheap flight deals from Ontario to District of Columbia

Most accurate provider	FlightHub 3 stars
Most trusted provider	FlightHub 3 stars
Round-trip from	$278 (Frontier)
One-way from	$127 (Trip.com)
Popular in	December
Cheapest in	August
Average price	$414

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. 8% potential increase in price ($34 potential increase over avg. RT price).

Search Deals

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

Search Deals

Average for round-trip flights in March 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 March 25, 2025.

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

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

Thu 4/179:55 amONT - DCA

2 stops9h 15mSouthwest

Mon 4/2110:45 amDCA - ONT

1 stop10h 50mSouthwest

Deal found 3/24

$338

Mon 4/286:24 pmONT - IAD

1 stop10h 19mHawaiian Airlines

Thu 5/16:30 amIAD - ONT

1 stop12h 02mHawaiian Airlines

Deal found 3/24

$361

Thu 5/19:00 amONT - IAD

2 stops10h 40mSouthwest

Thu 5/86:40 pmIAD - ONT

1 stop7h 20mSouthwest

Deal found 3/24

$382

Sat 4/266:00 amONT - IAD

1 stop11h 43mAlaska Airlines

Tue 4/2910:00 amIAD - ONT

1 stop13h 29mAlaska Airlines

Deal found 3/24

$384

Wed 4/2310:54 amONT - DCA

2 stops8h 09mAmerican Airlines

Sun 4/275:00 amDCA - ONT

1 stop7h 54mAmerican Airlines

Deal found 3/24

$387

Fri 5/26:00 amONT - DCA

1 stop7h 57mUnited Airlines

Wed 5/77:25 amDCA - ONT

2 stops10h 44mUnited Airlines

Deal found 3/24

$402

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 March 25, 2025.

Sat 4/512:59 amONT - DCA

1 stop8h 05mFrontier

Tue 4/87:00 amDCA - ONT

1 stop10h 27mFrontier

Deal found 3/24

$278

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

Thu 4/179:55 amONT - DCA

2 stops9h 15mSouthwest

Mon 4/2110:45 amDCA - ONT

1 stop10h 50mSouthwest

Deal found 3/24

$338

Mon 4/286:24 pmONT - IAD

1 stop10h 19mAlaska Airlines

Wed 4/306:30 amIAD - ONT

1 stop12h 02mAlaska Airlines

Deal found 3/24

$361

Thu 4/171:20 pmONT - IAD

1 stop8h 49mUnited Airlines

Sun 4/2010:01 amIAD - ONT

1 stop8h 16mUnited Airlines

Deal found 3/24

$363

Wed 4/2311:46 amONT - IAD

1 stop9h 12mHawaiian Airlines

Fri 4/256:30 amIAD - ONT

1 stop12h 02mHawaiian Airlines

Deal found 3/24

$396

Sun 5/1110:15 pmONT - IAD

1 stop29h 16mFrontier

Sat 5/178:01 amIAD - ONT

1 stop16h 26mFrontier

Deal found 3/24

$288

Sat 4/512:59 amONT - DCA

1 stop8h 05mMultiple Airlines

Mon 4/1411:54 amDCA - ONT

2 stops15h 05mMultiple Airlines

Deal found 3/25

$606

Sat 4/2610:15 pmONT - IAD

1 stop8h 04mDelta

Sat 5/36:00 amIAD - ONT

1 stop7h 57mDelta

Deal found 3/24

$326

Thu 5/19:00 amONT - IAD

2 stops10h 40mSouthwest

Thu 5/86:40 pmIAD - ONT

1 stop7h 20mSouthwest

Deal found 3/24

$382

Wed 4/2310:54 amONT - DCA

2 stops8h 09mAmerican Airlines

Sun 4/275:00 amDCA - ONT

1 stop7h 54mAmerican Airlines

Deal found 3/24

$387

Last-minute flights from Ontario to District of Columbia
Discover last-minute flight deals from Ontario to District of Columbia. 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 4/112:46 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

Wed 4/21:35 pmONT - IAD

1 stop6h 39mUnited Airlines

Tue 4/88:30 amIAD - ONT

1 stop7h 08mUnited Airlines

Deal found 3/23

$694

Wed 4/26:00 amONT - IAD

1 stop8h 59mAlaska Airlines

Tue 4/87:00 amIAD - ONT

2 stops13h 02mAlaska Airlines

Deal found 3/23

$828

Sat 4/512:59 amONT - DCA

1 stop8h 05mFrontier

Tue 4/87:00 amDCA - ONT

1 stop10h 27mFrontier

Deal found 3/24

$278

Mon 4/77:17 pmONT - DCA

2 stops12h 37mAlaska Airlines

Wed 4/911:54 amDCA - ONT

2 stops15h 05mAlaska Airlines

Deal found 3/24

$509

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 March 25, 2025.

Tue 4/2912:59 amONT - DCA

1 stop13h 00mFrontier

Deal found 3/24

$127

Sun 5/42:28 pmONT - IAD

1 stop13h 03mFrontier

Deal found 3/24

$145

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

Fri 7/186:38 pmONT - IAD

1 stop7h 46mUnited Airlines

Deal found 3/24

$164

Thu 4/106:00 amONT - DCA

2 stops13h 00mDelta

Deal found 3/24

$169

Sat 4/266:00 amONT - IAD

2 stops8h 22mDelta

Deal found 3/24

$169

Sat 4/266:20 amONT - DCA

2 stops12h 25mSouthwest

Deal found 3/24

$184

Sun 7/1312:59 amONT - IAD

1 stop7h 00mAmerican Airlines

Deal found 3/24

$199

Tue 7/87:00 amONT - DCA

1 stop8h 02mUnited Airlines

Deal found 3/25

$214

Tue 4/86:00 amONT - DCA

2 stops13h 15mAlaska Airlines

Deal found 3/24

$219

Sun 4/279:30 pmONT - IAD

1 stop12h 55mSouthwest

Deal found 3/24

$235

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 4/5

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

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

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Sat 4/26

10:15 pm-9:19 am

1 stop8h 04m

Washington, D.C. Dulles Intl

Sat 5/3

6:00 am-10:57 am

1 stop7h 57m

$326

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Thu 4/17

9:55 am-10:10 pm

2 stops9h 15m

Washington, D.C. Reagan-National

Mon 4/21

10:45 am-6:35 pm

1 stop10h 50m

$338

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Mon 4/28

6:24 pm-7:43 am

1 stop10h 19m

Washington, D.C. Dulles Intl

Wed 4/30

6:30 am-3:32 pm

1 stop12h 02m

$361

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Thu 4/17

1:20 pm-1:09 am

1 stop8h 49m

Washington, D.C. Dulles Intl

Sun 4/20

10:01 am-3:17 pm

1 stop8h 16m

$363

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Thu 5/1

9:00 am-10:40 pm

2 stops10h 40m

Washington, D.C. Dulles Intl

Thu 5/8

6:40 pm-11:00 pm

1 stop7h 20m

$382

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Wed 4/23

10:54 am-10:03 pm

2 stops8h 09m

Washington, D.C. Reagan-National

Sun 4/27

5:00 am-9:54 am

1 stop7h 54m

$387

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/24

Showing 1-10 of 28 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 $309). Flying from Ontario to District of Columbia 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 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

9,782 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 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 $127. Users have also found prices from $157 and $161 on Hawaiian Airlines and Alaska Airlines, respectively.
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 $309). Flying from Ontario to District of Columbia 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

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$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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$127+ 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 4/29. 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 March 25, 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 March 25, 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 March 25, 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 March 25, 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?

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 March 25, 2025.