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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 3/7. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — ONT
Mar 5 — Mar 121
Thu 3/5
Thu 3/12
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 February 3, 2026.

This Trip.com deal was found by Cheapflights users on 2/1. 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.
Tue 3/38:00 am
DCA
-
ONT
1 stop16h 34m
Frontier
Sat 3/76:15 am
ONT
-
DCA
1 stop7h 44m
Frontier
Deal found 2/1$134
This Kiwi.com deal was found by Cheapflights users on 2/1. 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.
Wed 3/42:00 pm
DCA
-
ONT
1 stop10h 34m
Frontier
Sat 3/76:15 am
ONT
-
DCA
1 stop7h 44m
Frontier
Deal found 2/1$139
This Trip.com deal was found by Cheapflights users on 2/3. 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 3/48:00 am
DCA
-
ONT
1 stop16h 34m
Frontier
Tue 3/106:15 am
ONT
-
DCA
1 stop12h 44m
Frontier
Deal found 2/3$140
This Trip.com deal was found by Cheapflights users on 2/2. 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 3/42:00 pm
DCA
-
ONT
1 stop10h 34m
Frontier
Wed 3/116:15 am
ONT
-
DCA
1 stop12h 44m
Frontier
Deal found 2/2$142
This Mytrip deal was found by Cheapflights users on 1/31. 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.
Tue 2/242:00 pm
DCA
-
ONT
1 stop10h 34m
Frontier
Tue 3/38:40 am
ONT
-
DCA
1 stop25h 35m
Frontier
Deal found 1/31$148
This Trip.com deal was found by Cheapflights users on 2/1. 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 3/26:00 pm
DCA
-
ONT
1 stop8h 59m
Frontier
Wed 3/116:15 am
ONT
-
DCA
1 stop12h 44m
Frontier
Deal found 2/1$152
This Frontier deal was found by Cheapflights users on 2/1. 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.
Tue 2/242:00 pm
DCA
-
ONT
1 stop10h 34m
Frontier
Wed 3/48:40 am
ONT
-
DCA
1 stop10h 19m
Frontier
Deal found 2/1$158
This Trip.com deal was found by Cheapflights users on 2/1. 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 3/76:00 pm
DCA
-
ONT
1 stop8h 59m
Frontier
Wed 3/186:15 am
ONT
-
DCA
1 stop7h 44m
Frontier
Deal found 2/1$162
This Mytrip deal was found by Cheapflights users on 2/2. 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 2/252:00 pm
DCA
-
ONT
1 stop22h 34m
Frontier
Sat 2/286:00 am
ONT
-
DCA
1 stop7h 59m
Frontier
Deal found 2/2$164
This Trip.com deal was found by Cheapflights users on 2/1. 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.
Tue 3/38:00 am
DCA
-
ONT
1 stop16h 34m
Frontier
Wed 3/186:15 am
ONT
-
DCA
1 stop12h 44m
Frontier
Deal found 2/1$167
This CheapOair deal was found by Cheapflights users on 2/1. 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 2/242:00 pm
DCA
-
ONT
1 stop10h 34m
Frontier
Thu 2/262:08 pm
ONT
-
DCA
1 stop19h 52m
Frontier
Deal found 2/1$169
This Alaska Airlines deal was found by Cheapflights users on 2/3. 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.
Tue 5/57:10 am
IAD
-
ONT
1 stop10h 22m
Alaska Airlines
Sat 5/910:39 am
ONT
-
IAD
1 stop10h 30m
Alaska Airlines
Deal found 2/3$277

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 February 3, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$134
(Trip.com)

One-way from

$65
(Trip.com)

Popular in

December

Cheapest in

September

Average price

$337
Provider with most accurate pricing for Washington, D.C. (WAS)-Los Angeles flight deals.
Search Deals
Provider most trusted by Cheapflights users for Washington, D.C. (WAS)-Los Angeles flights.
Search Deals
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 ($47 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($12 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 2026
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 February 3, 2026.
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

Wed 4/1

6:00 pm-11:56 pm

1 stop8h 56m

Ontario

Fri 4/10

6:20 am-9:59 pm

1 stop12h 39m

$235

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Wed 3/11

6:00 pm-11:59 pm

1 stop8h 59m

Ontario

Thu 3/19

6:15 am-4:59 pm

1 stop7h 44m

$249

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Tue 2/24

7:05 am-3:08 pm

1 stop11h 03m

Ontario

Thu 2/26

4:02 pm-5:40 am

1 stop10h 38m

$288

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Tue 4/14

6:59 am-11:36 am

1 stop7h 37m

Ontario

Wed 4/15

12:49 pm-10:31 pm

1 stop6h 42m

$297

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Wed 3/4

4:10 pm-10:57 pm

1 stop9h 47m

Ontario

Sat 3/7

1:50 pm-11:20 pm

1 stop6h 30m

$297

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Wed 3/4

7:30 am-1:54 pm

1 stop9h 24m

Ontario

Tue 3/10

11:59 am-11:48 pm

1 stop8h 49m

$297

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Wed 2/25

6:00 am-12:02 pm

1 stop9h 02m

Ontario

Sat 2/28

10:20 pm-9:13 am

1 stop7h 53m

$297

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Wed 3/11

6:01 am-11:47 am

1 stop8h 46m

Ontario

Sat 3/14

10:25 pm-9:10 am

1 stop7h 45m

$297

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Tue 2/24

7:05 am-12:07 pm

1 stop8h 02m

Ontario

Sat 2/28

10:20 pm-9:13 am

1 stop7h 53m

$297

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Wed 3/4

7:30 am-1:54 pm

1 stop9h 24m

Ontario

Wed 3/11

11:59 am-11:48 pm

1 stop8h 49m

$297

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/31

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, November is the cheapest month in which you can book a flight from District of Columbia to Ontario (average of $77). Flying from District of Columbia to Ontario in March is currently the most expensive (average of $182). 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 February 3, 2026.

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 36% versus a flight at noon.

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, Alaska Airlines, and Delta can get you from District of Columbia to Ontario in just under 7h 37m. Your travel time can differ by up to 3h 26m. 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 ($85), 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, November is the cheapest month in which you can book a flight from District of Columbia to Ontario (average of $77). Flying from District of Columbia to Ontario in March is currently the most expensive (average of $182). 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 February 3, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$125Average$281FlexibilityNo cancel feeOn-time62%
DeltaCheapest$173Average$409FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$222Average$441FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$256Average$469FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$278Average$476FlexibilityNo cancel feeOn-time63%

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