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District of Columbia

$133+ 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 9/19. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BWI
Jun 17 — Jun 241
Tue 6/17
Tue 6/24
1 adult, Economy
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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 June 12, 2025.

Round-trip from

$255
(Frontier)

One-way from

$133
(FlightHub)

Popular in

December

Cheapest in

August

Average price

$382
From Ontario to District of Columbia
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One-way flight from Ontario to District of Columbia
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Highest demand for flights based on searches. 11% potential increase in price ($43 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($10 potential savings vs. average RT price).
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Average for round-trip flights in June 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 June 12, 2025.

This Frontier deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/97:22 pmONT - IAD
1 stop8h 12mFrontier
Tue 7/157:30 amIAD - ONT
1 stop11h 50mFrontier
Deal found 6/11$255
This Kiwi.com deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/2112:59 amONT - DCA
1 stop8h 12mFrontier
Wed 8/271:00 pmDCA - ONT
1 stop13h 50mFrontier
Deal found 6/10$263
This American Airlines deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/2812:47 pmONT - DCA
1 stop9h 18mAmerican Airlines
Tue 9/29:29 amDCA - ONT
1 stop9h 37mAmerican Airlines
Deal found 6/11$297
This Alaska Airlines deal was found by Cheapflights users on 6/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/57:22 pmONT - IAD
1 stop9h 10mAlaska Airlines
Mon 9/86:09 pmIAD - ONT
1 stop19h 35mAlaska Airlines
Deal found 6/9$297
This American Airlines deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/711:59 pmONT - IAD
1 stop8h 02mAmerican Airlines
Sun 8/106:27 amIAD - ONT
1 stop8h 26mAmerican Airlines
Deal found 6/11$298
This Delta deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/2210:00 pmONT - DCA
2 stops14h 00mDelta
Mon 8/253:50 pmDCA - ONT
2 stops9h 50mDelta
Deal found 6/10$308
This Southwest deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/35:30 amONT - DCA
1 stop7h 25mSouthwest
Thu 8/74:35 pmDCA - ONT
2 stops8h 25mSouthwest
Deal found 6/10$352
This Delta deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/105:09 pmONT - IAD
2 stops12h 50mDelta
Tue 7/157:45 amIAD - ONT
1 stop7h 29mDelta
Deal found 6/11$383
This Alaska Airlines deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/66:00 amONT - DCA
1 stop12h 44mAlaska Airlines
Mon 11/175:00 pmDCA - ONT
1 stop9h 30mAlaska Airlines
Deal found 6/12$389
This United Airlines deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/96:37 pmONT - IAD
1 stop7h 45mUnited Airlines
Tue 10/212:45 pmIAD - ONT
1 stop8h 39mUnited Airlines
Deal found 6/10$397
This United Airlines deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/285:05 amONT - DCA
1 stop7h 00mUnited Airlines
Wed 7/23:30 pmDCA - ONT
1 stop9h 36mUnited Airlines
Deal found 6/10$424

Cheapflights Fare Finder

Customize your flight search to find flights from Ontario to District of Columbia that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated June 12, 2025.
Use the filters below to find and compare flights from Ontario to District of Columbia that are best for you.

Fly from

Ontario

Fly to

District of Columbia

Route

Depart

Return

Price

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Wed 7/9

7:22 pm-6:34 am

1 stop8h 12m

Washington, D.C. Dulles Intl

Tue 7/15

7:30 am-4:20 pm

1 stop11h 50m

$255

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Thu 8/21

12:59 am-12:11 pm

1 stop8h 12m

Washington, D.C. Reagan-National

Wed 8/27

1:00 pm-11:50 pm

1 stop13h 50m

$263

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Thu 8/28

12:47 pm-1:05 am

1 stop9h 18m

Washington, D.C. Reagan-National

Tue 9/2

9:29 am-4:06 pm

1 stop9h 37m

$297

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Fri 9/5

7:22 pm-7:32 am

1 stop9h 10m

Washington, D.C. Dulles Intl

Mon 9/8

6:09 pm-10:44 am

1 stop19h 35m

$297

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Thu 8/7

11:59 pm-11:01 am

1 stop8h 02m

Washington, D.C. Dulles Intl

Sun 8/10

6:27 am-11:53 am

1 stop8h 26m

$298

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Fri 8/22

10:00 pm-3:00 pm

2 stops14h 00m

Washington, D.C. Reagan-National

Mon 8/25

3:50 pm-10:40 pm

2 stops9h 50m

$308

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Sun 8/3

5:30 am-3:55 pm

1 stop7h 25m

Washington, D.C. Reagan-National

Thu 8/7

4:35 pm-10:00 pm

2 stops8h 25m

$352

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Thu 7/10

5:09 pm-8:59 am

2 stops12h 50m

Washington, D.C. Dulles Intl

Tue 7/15

7:45 am-12:14 pm

1 stop7h 29m

$383

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Sat 9/6

6:00 am-9:44 pm

1 stop12h 44m

Washington, D.C. Reagan-National

Mon 11/17

5:00 pm-11:30 pm

1 stop9h 30m

$389

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Thu 10/9

6:37 pm-5:22 am

1 stop7h 45m

Washington, D.C. Dulles Intl

Tue 10/21

2:45 pm-8:24 pm

1 stop8h 39m

$397

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/10

Showing 1-10 of 24 results
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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?

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 June 12, 2025.

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.

Weekly flight availability from Ontario to District of Columbia

Explore weekly flight availability from Ontario to District of Columbia. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated June 12, 2025.

The most flights from ONT to USDC are scheduled on a Monday (1 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (1 on average).

Rainfall in District of Columbia by month

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

Plan your trip to District of Columbia by taking into account the average temperature totals 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 insights into the airlines that provide service to District of Columbia. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to District of Columbia. Reviews last updated June 12, 2025.
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
10,000 reviews

Boarding

8.1

Comfort

7.8

Food

7.1

Overall

8.0

Entertainment

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Comfort

7.8

Food

7.1

Overall

8.0

Entertainment

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Southwest
8.0
Very good
4,287 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Comfort

7.8

Food

7.1

Overall

8.0

Entertainment

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Delta
8.0
Very good
7,950 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Comfort

7.8

Food

7.1

Overall

8.0

Entertainment

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Hawaiian Airlines
7.9
Good
2,494 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Comfort

7.8

Food

7.1

Overall

8.0

Entertainment

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
United Airlines
7.4
Good
8,790 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Comfort

7.8

Food

7.1

Overall

8.0

Entertainment

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

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?

    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.

  • How popular is this Ontario to District of Columbia flight route?

    The Ontario to District of Columbia flight path was viewed by 1 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

  • 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 $133. Users have also found prices from $147 and $149 on Hawaiian Airlines and Delta, respectively.

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

    Looking at all options, your cheapest flight can be booked for $153. While the most popular route (Ontario - Washington, D.C. Dulles Intl) can be booked for $265 on average our data indicates $307 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.

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Alternative routes for Ontario to District of Columbia

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Top 6 airlines flying from Ontario to District of Columbia

Discover the top 6 airlines that operate flights from Ontario to District of Columbia. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated June 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$130Average$191FlexibilityNo cancel feeOn-time65%
FrontierCheapest$141Average$262FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$256Average$456FlexibilityNo cancel feeOn-time69%
DeltaCheapest$286Average$412FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$286Average$504FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$326Average$465FlexibilityNo cancel feeOn-time63%

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