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Ontario

$65+ 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 11/15. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — ONT
Nov 30 — Dec 71
Sun 11/30
Sun 12/7
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 October 31, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$242
(Trip.com)

One-way from

$65
(CheapOair)

Popular in

December

Cheapest in

September

Average price

$367
Provider with most accurate pricing for Washington, D.C. (WAS)-Los Angeles flight deals.
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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 ($35 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($13 potential savings vs. average RT price).
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Average for round-trip flights in October 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 October 31, 2025.

This Trip.com deal was found by Cheapflights users on 10/29. 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.
Mon 12/88:00 amDCA - ONT
1 stop9h 25mFrontier
Sun 12/144:01 pmONT - DCA
1 stop26h 58mFrontier
Deal found 10/29$242
This CheapOair deal was found by Cheapflights users on 10/29. 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 11/188:15 amDCA - ONT
1 stop16h 12mFrontier
Thu 11/2012:58 amONT - DCA
1 stop12h 59mFrontier
Deal found 10/29$243
This Frontier deal was found by Cheapflights users on 10/30. 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 11/72:00 pmDCA - ONT
1 stop12h 50mFrontier
Tue 11/188:45 amONT - DCA
1 stop10h 14mFrontier
Deal found 10/30$246
This Trip.com deal was found by Cheapflights users on 10/29. 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.
Fri 12/58:00 amDCA - ONT
1 stop9h 25mFrontier
Mon 12/153:20 pmONT - DCA
1 stop18h 46mFrontier
Deal found 10/29$247
This Frontier deal was found by Cheapflights users on 10/29. 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.
Sun 11/166:00 pmDCA - ONT
1 stop8h 50mFrontier
Sat 11/2212:58 amONT - DCA
1 stop9h 05mFrontier
Deal found 10/29$250
This CheapOair deal was found by Cheapflights users on 10/30. 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 11/48:00 amDCA - ONT
1 stop16h 27mFrontier
Tue 11/118:45 amONT - DCA
1 stop25h 17mFrontier
Deal found 10/30$252
This CheapOair deal was found by Cheapflights users on 10/30. 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.
Fri 11/76:00 pmDCA - ONT
1 stop8h 50mFrontier
Fri 11/144:05 pmONT - DCA
1 stop21h 54mFrontier
Deal found 10/30$253
This Booking.com deal was found by Cheapflights users on 10/30. 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.
Tue 11/48:00 amDCA - ONT
1 stop16h 27mFrontier
Sat 11/812:05 pmONT - DCA
1 stop6h 54mFrontier
Deal found 10/30$254
This Frontier deal was found by Cheapflights users on 10/29. 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.
Mon 12/158:00 amDCA - ONT
1 stop9h 25mFrontier
Sat 12/206:45 amONT - DCA
1 stop12h 14mFrontier
Deal found 10/29$256
This CheapOair deal was found by Cheapflights users on 10/29. 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 11/176:00 pmDCA - ONT
1 stop8h 50mFrontier
Sun 11/2312:58 amONT - DCA
1 stop18h 01mFrontier
Deal found 10/29$257
This Trip.com deal was found by Cheapflights users on 10/29. 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.
Sun 11/96:00 pmDCA - ONT
1 stop8h 50mFrontier
Thu 11/1312:05 pmONT - DCA
1 stop6h 54mFrontier
Deal found 10/29$261
This American Airlines deal was found by Cheapflights users on 10/29. 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.
Sat 12/611:30 amIAD - ONT
1 stop9h 47mAmerican Airlines
Sat 12/1310:47 amONT - IAD
1 stop8h 41mAmerican Airlines
Deal found 10/29$296

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 October 31, 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

Thu 12/25

2:00 pm-11:59 pm

1 stop12h 59m

Ontario

Wed 12/31

6:45 am-9:59 pm

1 stop12h 14m

$281

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Tue 11/25

8:00 am-3:26 pm

1 stop10h 26m

Ontario

Wed 11/26

12:58 am-4:57 pm

1 stop12h 59m

$313

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Tue 11/18

6:00 am-11:06 am

1 stop8h 06m

Ontario

Tue 11/18

10:25 pm-9:10 am

1 stop7h 45m

$319

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Thu 11/20

6:00 am-11:06 am

1 stop8h 06m

Ontario

Wed 12/3

12:12 pm-9:41 pm

1 stop6h 29m

$322

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Wed 11/19

6:00 am-10:34 am

1 stop7h 34m

Ontario

Wed 11/19

10:25 pm-12:29 pm

2 stops11h 04m

$324

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Thu 11/20

6:00 am-11:06 am

1 stop8h 06m

Ontario

Thu 11/27

6:00 am-9:22 pm

2 stops12h 22m

$324

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Thu 12/4

7:40 am-2:30 pm

1 stop9h 50m

Ontario

Wed 12/10

5:55 am-5:05 pm

1 stop8h 10m

$325

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Tue 2/24

4:00 pm-9:14 pm

1 stop8h 14m

Ontario

Thu 2/26

1:00 pm-11:50 pm

1 stop7h 50m

$325

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Thu 12/4

12:30 pm-11:58 pm

2 stops14h 28m

Ontario

Mon 12/8

10:25 pm-9:11 am

1 stop7h 46m

$330

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Tue 11/18

4:10 pm-10:51 pm

1 stop9h 41m

Ontario

Thu 11/20

1:29 pm-11:15 pm

1 stop6h 46m

$363

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/30

Showing 1-10 of 41 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 $73). Flying from District of Columbia to Ontario in December is currently the most expensive (average of $178). 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 October 31, 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. Sunday 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, Delta, and Southwest can get you from District of Columbia to Ontario in just under 8h 06m. Your travel time can differ by up to 4h 53m. 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 Southwest ($163), Delta ($163), and Alaska Airlines ($173).

  • 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 $73). Flying from District of Columbia to Ontario in December is currently the most expensive (average of $178). 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 October 31, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$168Average$287FlexibilityNo cancel feeOn-time62%
DeltaCheapest$213Average$432FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$256Average$478FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$284Average$506FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$304Average$498FlexibilityNo cancel feeOn-time63%

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