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$88+ 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 11/3. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — ONT
Oct 15 — Oct 221
Wed 10/15
Wed 10/22
1 adult, Economy
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Cheap 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 September 15, 2025.

Round-trip from

$161
(Priceline)

One-way from

$88
(United Airlines)

Popular in

December

Cheapest in

August

Average price

$327
From District of Columbia to Ontario
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One-way flight from District of Columbia to Ontario
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Highest demand for flights based on searches. 9% potential increase in price ($37 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($12 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Find 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 September 15, 2025.

This Priceline deal was found by Cheapflights users on 9/13. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/2810:17 amIAD - ONT
1 stop8h 07mFrontier
Sun 9/287:15 pmONT - IAD
1 stop11h 02mFrontier
Deal found 9/13$161
This Booking.com deal was found by Cheapflights users on 9/13. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/2810:17 amIAD - ONT
1 stop10h 58mFrontier
Thu 10/24:34 pmONT - IAD
1 stop13h 43mFrontier
Deal found 9/13$162
This Booking.com deal was found by Cheapflights users on 9/14. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/210:17 amIAD - ONT
1 stop8h 22mFrontier
Sun 10/54:09 pmONT - IAD
1 stop14h 08mFrontier
Deal found 9/14$163
This Mytrip deal was found by Cheapflights users on 9/14. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/11:00 pmDCA - ONT
1 stop9h 54mFrontier
Tue 10/147:04 amONT - DCA
1 stop26h 00mFrontier
Deal found 9/14$167
This Gotogate deal was found by Cheapflights users on 9/14. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/12:00 pmDCA - ONT
1 stop12h 50mFrontier
Sat 11/86:53 amONT - DCA
1 stop7h 06mFrontier
Deal found 9/14$168
This Booking.com deal was found by Cheapflights users on 9/13. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/286:00 pmDCA - ONT
1 stop16h 53mFrontier
Mon 9/298:59 pmONT - DCA
1 stop22h 00mFrontier
Deal found 9/13$169
This Gotogate deal was found by Cheapflights users on 9/14. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/2510:17 amIAD - ONT
1 stop8h 12mFrontier
Thu 10/24:34 pmONT - IAD
1 stop13h 43mFrontier
Deal found 9/14$174
This Booking.com deal was found by Cheapflights users on 9/13. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/2510:17 amIAD - ONT
1 stop8h 12mFrontier
Sun 9/287:15 pmONT - IAD
1 stop11h 02mFrontier
Deal found 9/13$175
This Cheapflightsfares deal was found by Cheapflights users on 9/13. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/76:31 pmDCA - ONT
1 stop8h 19mFrontier
Mon 11/36:53 amONT - DCA
1 stop7h 06mFrontier
Deal found 9/13$176
This Frontier deal was found by Cheapflights users on 9/14. 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.
Fri 10/176:31 pmDCA - ONT
1 stop8h 19mFrontier
Thu 10/236:53 amONT - DCA
1 stop7h 06mFrontier
Deal found 9/14$177
This Booking.com deal was found by Cheapflights users on 9/13. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/266:00 pmDCA - ONT
1 stop28h 54mFrontier
Mon 9/298:59 pmONT - DCA
1 stop22h 00mFrontier
Deal found 9/13$190
This Trip.com deal was found by Cheapflights users on 9/13. 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.
Sat 10/181:00 pmDCA - ONT
1 stop13h 50mFrontier
Wed 10/226:53 amONT - DCA
1 stop12h 06mFrontier
Deal found 9/13$191

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 September 15, 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 11/1

6:00 pm-11:50 pm

1 stop8h 50m

Ontario

Sat 11/8

6:53 am-4:59 pm

1 stop7h 06m

$168

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Mon 9/29

6:00 pm-7:54 pm

1 stop28h 54m

Ontario

Wed 10/1

8:59 pm-9:59 pm

1 stop22h 00m

$169

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Wed 10/8

7:00 am-9:35 am

1 stop29h 35m

Ontario

Wed 10/15

6:53 am-12:04 pm

1 stop26h 11m

$169

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Fri 10/17

6:31 pm-11:50 pm

1 stop8h 19m

Ontario

Sat 10/25

7:04 am-4:59 pm

1 stop6h 55m

$177

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Fri 11/14

1:00 pm-11:50 pm

1 stop13h 50m

Ontario

Tue 11/18

6:53 am-4:59 pm

1 stop7h 06m

$213

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Sat 11/1

6:00 am-10:26 am

1 stop7h 26m

Ontario

Sat 11/8

11:36 am-9:43 pm

1 stop7h 07m

$277

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Fri 10/31

7:35 am-2:01 pm

1 stop9h 26m

Ontario

Tue 11/4

11:48 am-12:40 am

1 stop9h 52m

$277

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Tue 10/14

7:35 am-5:10 pm

1 stop12h 35m

Ontario

Wed 10/15

11:48 am-12:40 am

1 stop9h 52m

$277

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Tue 10/14

7:35 am-5:10 pm

1 stop12h 35m

Ontario

Fri 10/17

10:00 pm-10:11 am

1 stop9h 11m

$277

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Thu 10/30

6:15 am-12:16 pm

1 stop9h 01m

Ontario

Tue 11/4

11:48 am-12:40 am

1 stop9h 52m

$277

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/14

Showing 1-10 of 45 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, August is the cheapest month in which you can book a flight from District of Columbia to Ontario (average of $246). Flying from District of Columbia to Ontario in March is currently the most expensive (average of $328). 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 September 15, 2025.

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

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 Delta can get you from District of Columbia to Ontario in just under 8h 50m. Your travel time can differ by up to 36m. 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 Delta ($139), Hawaiian Airlines ($154), and Southwest ($159).

  • 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, August is the cheapest month in which you can book a flight from District of Columbia to Ontario (average of $246). Flying from District of Columbia to Ontario in March is currently the most expensive (average of $328). 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 September 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$150Average$275FlexibilityNo cancel feeOn-time62%
DeltaCheapest$213Average$412FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$218Average$507FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$296Average$475FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$296Average$502FlexibilityNo cancel feeOn-time63%

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