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Ontario

$61+ Cheap flights from District of Columbia to Ontario (ONT)

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 1/13. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — ONT
Jan 17 — Jan 241
Sat 1/17
Sat 1/24
1 adult, Economy
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Cheap flight deals from District of Columbia to Ontario

Cheapest flights from District of Columbia to Ontario
Explore the most affordable flight options available from District of Columbia to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 18, 2025.

This CheapOair deal was found by Cheapflights users on 12/17. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/318:00 amDCA - ONT
1 stop18h 59mFrontier
Mon 1/56:45 amONT - DCA
1 stop12h 14mFrontier
Deal found 12/17$309
This CheapOair deal was found by Cheapflights users on 12/16. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/252:00 pmDCA - ONT
1 stop12h 59mFrontier
Sat 1/107:00 amONT - DCA
1 stop27h 01mFrontier
Deal found 12/16$313
This CheapOair deal was found by Cheapflights users on 12/16. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/318:00 amDCA - ONT
1 stop18h 59mFrontier
Sat 1/36:45 amONT - DCA
1 stop27h 16mFrontier
Deal found 12/16$358
This Frontier deal was found by Cheapflights users on 12/15. 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.
Thu 12/252:00 pmDCA - ONT
1 stop12h 59mFrontier
Mon 1/56:45 amONT - DCA
1 stop12h 14mFrontier
Deal found 12/15$363
This CheapOair deal was found by Cheapflights users on 12/15. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/298:00 amDCA - ONT
1 stop18h 59mFrontier
Thu 1/16:45 amONT - DCA
1 stop27h 16mFrontier
Deal found 12/15$364
This Trip.com deal was found by Cheapflights users on 12/17. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/252:00 pmDCA - ONT
1 stop12h 59mFrontier
Sun 1/116:00 amONT - DCA
1 stop12h 59mFrontier
Deal found 12/17$374
This Frontier deal was found by Cheapflights users on 12/16. 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.
Thu 12/252:00 pmDCA - ONT
1 stop12h 59mFrontier
Thu 1/16:45 amONT - DCA
1 stop12h 14mFrontier
Deal found 12/16$383
This CheapOair deal was found by Cheapflights users on 12/15. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/238:00 amDCA - ONT
1 stop18h 59mFrontier
Wed 12/316:45 amONT - DCA
1 stop27h 16mFrontier
Deal found 12/15$388
This Trip.com deal was found by Cheapflights users on 12/16. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/248:00 amDCA - ONT
1 stop18h 59mFrontier
Thu 1/16:45 amONT - DCA
1 stop27h 16mFrontier
Deal found 12/16$391
This Frontier deal was found by Cheapflights users on 12/16. 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.
Thu 12/252:00 pmDCA - ONT
1 stop12h 59mFrontier
Tue 1/67:00 amONT - DCA
1 stop11h 59mFrontier
Deal found 12/16$412
This American Airlines deal was found by Cheapflights users on 12/16. 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 12/256:05 amIAD - ONT
1 stop10h 47mAmerican Airlines
Wed 12/3110:40 pmONT - IAD
1 stop7h 02mAmerican Airlines
Deal found 12/16$470
This United Airlines deal was found by Cheapflights users on 12/18. 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 12/252:24 pmIAD - ONT
1 stop9h 43mUnited Airlines
Wed 12/3111:59 pmONT - IAD
1 stop8h 46mUnited Airlines
Deal found 12/18$503

Find flight deals from District of Columbia to Ontario

Keep the following information in mind while searching for District of Columbia to Ontario flight deals. Data was last updated December 18, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$147
(Trip.com)

One-way from

$61
(Trip.com)

Popular in

December

Cheapest in

September

Average price

$507
Provider with most accurate pricing for Washington, D.C. (WAS)-Los Angeles flight deals.
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Provider most trusted by Cheapflights users for Washington, D.C. (WAS)-Los Angeles flights.
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From District of Columbia to Ontario
Search Deals
One-way flight from District of Columbia to Ontario
Search Deals
Highest demand for flights based on searches. 11% potential increase in price ($45 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease ($15 potential savings vs. average RT price).
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Average for round-trip flights in December 2025
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from District of Columbia to Ontario 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 December 18, 2025.
Use the filters below to find and compare flights from District of Columbia to Ontario that are best for you.

Fly from

District of Columbia

Fly to

Ontario

Route

Depart

Return

Price

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Sat 2/21

6:00 pm-7:59 am

1 stop16h 59m

Ontario

Tue 2/24

7:30 am-1:15 pm

1 stop26h 45m

$149

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Wed 1/28

8:59 am-3:07 pm

1 stop9h 08m

Ontario

Wed 2/11

7:30 am-9:59 pm

1 stop11h 29m

$165

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Wed 2/25

8:00 am-9:34 pm

1 stop16h 34m

Ontario

Sat 2/28

6:00 am-1:15 pm

1 stop28h 15m

$166

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Tue 1/20

6:00 pm-3:07 pm

1 stop24h 07m

Ontario

Tue 2/17

7:30 am-1:15 pm

1 stop26h 45m

$183

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Mon 2/23

6:00 pm-11:59 pm

1 stop8h 59m

Ontario

Wed 2/25

7:30 am-1:15 pm

1 stop26h 45m

$183

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Mon 1/26

6:00 pm-12:20 am

1 stop9h 20m

Ontario

Wed 1/28

7:15 am-4:59 pm

1 stop6h 44m

$185

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Sat 1/10

6:00 pm-11:14 pm

1 stop8h 14m

Ontario

Sat 1/17

7:15 am-9:59 pm

1 stop11h 44m

$191

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Wed 1/7

6:00 pm-11:14 pm

1 stop8h 14m

Ontario

Fri 1/9

6:00 am-9:59 pm

1 stop12h 59m

$217

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Fri 1/30

8:00 am-12:20 am

1 stop19h 20m

Ontario

Mon 2/2

6:20 am-4:59 pm

1 stop7h 39m

$218

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Thu 2/19

6:00 pm-11:59 pm

1 stop8h 59m

Ontario

Sun 2/22

2:08 pm-9:59 pm

1 stop28h 51m

$239

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/17

Showing 1-10 of 46 results
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Best time to book a flight from District of Columbia to Ontario

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

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

Currently, January is the cheapest month in which you can book a flight from District of Columbia to Ontario (average of $70). Flying from District of Columbia to Ontario in December is currently the most expensive (average of $168). 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 DC to ONT?

Find hourly flight availability from District of Columbia to Ontario. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated December 18, 2025.

When flying from District of Columbia to Ontario, the time of day you fly usually plays a role in the price. Save by searching for a flight in the morning, which can drop the price by up to 24% versus a flight at noon.

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

Use this chart to determine the cheapest time to fly round-trip from District of Columbia to Ontario. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their District of Columbia to Ontario flight should consider departing on Friday evenings when fares are most often at their lowest. Friday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

Related info for your journey

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

    If you book a flight to Ontario from District of Columbia, you will be flying to Ontario, which is the city’s only airport. Ontario (ONT) is located 3.1 mi from the center of Ontario.

  • How long is the flight from District of Columbia to Ontario?

    Frontier and Alaska Airlines can get you from District of Columbia to Ontario in just under 16h 59m. Your travel time can differ by up to 2h 56m. Airlines will cover a distance of 2258 mi. This flight may include one or multiple stops.

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

    The cheapest airlines for a one-way flight from District of Columbia to Ontario are Frontier ($75), Delta ($109), and American Airlines ($113).

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

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

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

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

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

    Yes. Cheapflights offers flight deals from District of Columbia to Ontario 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 District of Columbia to Ontario?

    Currently, January is the cheapest month in which you can book a flight from District of Columbia to Ontario (average of $70). Flying from District of Columbia to Ontario in December is currently the most expensive (average of $168). 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

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Alternative routes for District of Columbia to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
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Top 5 airlines flying from District of Columbia to Ontario

Discover the top 5 airlines that operate flights from District of Columbia to Ontario. 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 December 18, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$173Average$283FlexibilityNo cancel feeOn-time62%
DeltaCheapest$213Average$478FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$256Average$468FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$284Average$482FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$304Average$497FlexibilityNo cancel feeOn-time63%

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