What airlines fly to District of Columbia?

United Airlines, American Airlines and Southwest are the top three most popular airlines that fly to District of Columbia from Ontario according to our data. United Airlines is the first choice among our users, with 48% of people opting to fly with this airline when traveling to District of Columbia. Keep in mind that there are 8 different airlines that fly to District of Columbia on a routine basis, so you have a few additional options to choose from.

What is the cheapest airline that flies from Ontario to District of Columbia?

Delta, Southwest, and United Airlines are the most popular carriers operating from Ontario to District of Columbia

When did momondo last update prices for flights from Ontario Airport to District of Columbia?

Prices for flights from Ontario Airport to District of Columbia refresh daily.

How many operators does momondo search for flights from Ontario Airport to District of Columbia?

As of September 2026, there are 5 operators available to choose from for flights from Ontario Airport to District of Columbia.

How old do you have to be to fly from Ontario Airport to District of Columbia?

The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Ontario Airport to District of Columbia.

What documentation or ID do you need to fly to District of Columbia?

The travel and health documents required for your trip to District of Columbia can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at District of Columbia. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

$84 Cheap Flights from Ontario to District of Columbia in 2026/27

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Ontario to District of Columbia

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

11:13 am - 11:59 pmONT Ontario-IAD Washington, D.C. Dulles Intl

9h 46m1 stop Seattle/Tacoma Intl

7:02 am - 1:16 pmIAD Washington, D.C. Dulles Intl-ONT Ontario

9h 14m1 stop Seattle/Tacoma Intl

$248Alaska Airlines

Wed, Oct 28 - Thu, Oct 29

11:13 am - 11:59 pmONT Ontario-IAD Washington, D.C. Dulles Intl

9h 46m1 stop Seattle/Tacoma Intl

7:02 am - 1:16 pmIAD Washington, D.C. Dulles Intl-ONT Ontario

9h 14m1 stop Seattle/Tacoma Intl

$248Alaska Airlines

Tue, Oct 27 - Thu, Oct 29

6:53 pm - 6:00 amONT Ontario-IAD Washington, D.C. Dulles Intl

8h 07m1 stop San Francisco

12:40 pm - 6:39 pmIAD Washington, D.C. Dulles Intl-ONT Ontario

8h 59m1 stop Chicago O'Hare Intl

$249United Airlines

Tue, Feb 9 - Sat, Feb 13

11:55 pm - 11:55 amONT Ontario-DCA Washington, D.C. Reagan-National

9h 00m1 stop Chicago Midway

6:00 am - 2:45 pmDCA Washington, D.C. Reagan-National-ONT Ontario

11h 45m1 stop Houston Hobby

$251Southwest

Mon, Oct 26 - Wed, Oct 28

6:00 am - 4:05 pmONT Ontario-DCA Washington, D.C. Reagan-National

7h 05m1 stop Houston George Bush Intcntl

1:00 pm - 8:20 pmDCA Washington, D.C. Reagan-National-ONT Ontario

10h 20m2 stops Newark Denver Intl

$254United Airlines

Thu, Jan 28 - Tue, Feb 2

11:52 am - 9:59 pmONT Ontario-DCA Washington, D.C. Reagan-National

7h 07m1 stop Denver Intl

7:00 am - 11:50 pmDCA Washington, D.C. Reagan-National-ONT Ontario

19h 50m1 stop Denver Intl

$256Frontier

Sat, Oct 10 - Wed, Oct 14

11:52 am - 9:50 pmONT Ontario-DCA Washington, D.C. Reagan-National

6h 58m1 stop Denver Intl

1:54 pm - 12:14 amDCA Washington, D.C. Reagan-National-ONT Ontario

13h 20m1 stop Denver Intl

$257Frontier

Sat, Nov 14 - Mon, Nov 23

11:55 pm - 11:55 amONT Ontario-DCA Washington, D.C. Reagan-National

9h 00m1 stop Chicago Midway

6:35 pm - 7:40 amDCA Washington, D.C. Reagan-National-ONT Ontario

16h 05m2 stops Chicago Midway Oakland

$257Southwest

Mon, Oct 26 - Wed, Oct 28

7:00 am - 4:57 pmONT Ontario-DCA Washington, D.C. Reagan-National

6h 57m1 stop Atlanta Hartsfield-Jackson

6:00 am - 11:27 amDCA Washington, D.C. Reagan-National-ONT Ontario

8h 27m1 stop Atlanta Hartsfield-Jackson

$257Delta

Sat, Feb 13 - Sat, Feb 20

12:00 pm - 10:55 pmONT Ontario-IAD Washington, D.C. Dulles Intl

7h 55m1 stop Atlanta Hartsfield-Jackson

7:15 am - 12:30 pmIAD Washington, D.C. Dulles Intl-ONT Ontario

8h 15m1 stop Salt Lake City

$257Delta

Sat, Feb 13 - Sat, Feb 20

Cheap last minute flights

Enter your travel dates to find the best prices.

11:45 am - 9:59 pmONT Ontario-DCA Washington, D.C. Reagan-National

7h 14m1 stop Denver Intl

6:00 pm - 11:47 pmDCA Washington, D.C. Reagan-National-ONT Ontario

8h 47m1 stop Denver Intl

$290Frontier

Tue, Sep 22 - Tue, Oct 6

11:45 am - 9:59 pmONT Ontario-DCA Washington, D.C. Reagan-National

7h 14m1 stop Denver Intl

6:00 pm - 11:47 pmDCA Washington, D.C. Reagan-National-ONT Ontario

8h 47m1 stop Denver Intl

$290Frontier

Sat, Sep 19 - Tue, Oct 6

5:44 pm - 6:20 amONT Ontario-IAD Washington, D.C. Dulles Intl

9h 36m1 stop Las Vegas Harry Reid Intl

7:02 am - 1:16 pmIAD Washington, D.C. Dulles Intl-ONT Ontario

9h 14m1 stop Seattle/Tacoma Intl

$398Multiple Airlines

Tue, Sep 22 - Tue, Oct 6

12:17 pm - 10:40 pmONT Ontario-DCA Washington, D.C. Reagan-National

7h 23m1 stop Atlanta Hartsfield-Jackson

6:00 am - 11:06 amDCA Washington, D.C. Reagan-National-ONT Ontario

8h 06m1 stop Atlanta Hartsfield-Jackson

$469Delta

Tue, Sep 22 - Tue, Oct 27

12:17 pm - 10:40 pmONT Ontario-DCA Washington, D.C. Reagan-National

7h 23m1 stop Atlanta Hartsfield-Jackson

6:00 am - 11:06 amDCA Washington, D.C. Reagan-National-ONT Ontario

8h 06m1 stop Atlanta Hartsfield-Jackson

$469Delta

Tue, Sep 22 - Wed, Oct 28

12:12 pm - 11:59 pmONT Ontario-IAD Washington, D.C. Dulles Intl

8h 47m1 stop Seattle/Tacoma Intl

7:02 am - 1:16 pmIAD Washington, D.C. Dulles Intl-ONT Ontario

9h 14m1 stop Seattle/Tacoma Intl

$479Alaska Airlines

Tue, Sep 22 - Wed, Oct 28

1:18 pm - 11:19 pmONT Ontario-IAD Washington, D.C. Dulles Intl

7h 01m1 stop Denver Intl

3:02 pm - 9:59 pmIAD Washington, D.C. Dulles Intl-ONT Ontario

9h 57m1 stop Houston George Bush Intcntl

$534United Airlines

Tue, Sep 22 - Mon, Oct 5

6:00 am - 4:04 pmONT Ontario-DCA Washington, D.C. Reagan-National

7h 04m1 stop Houston George Bush Intcntl

5:10 pm - 10:49 pmDCA Washington, D.C. Reagan-National-ONT Ontario

8h 39m1 stop Chicago O'Hare Intl

$587United Airlines

Tue, Sep 22 - Sat, Sep 26

8:30 am - 8:55 pmONT Ontario-DCA Washington, D.C. Reagan-National

9h 25m2 stops Austin Bergstrom New Orleans Louis Armstrong

9:25 am - 4:00 pmDCA Washington, D.C. Reagan-National-ONT Ontario

9h 35m1 stop Dallas Love Field

$592Southwest

Tue, Sep 22 - Sat, Sep 26

7:45 am - 7:10 pmONT Ontario-DCA Washington, D.C. Reagan-National

8h 25m2 stops Las Vegas Harry Reid Intl Chicago Midway

9:25 am - 4:30 pmDCA Washington, D.C. Reagan-National-ONT Ontario

10h 05m2 stops Dallas Love Field Denver Intl

$597Southwest

Tue, Sep 22 - Sat, Sep 26

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Frontier flights from Ontario to District of Columbia

Our best Frontier deals on Ontario to District of Columbia flight tickets

Frontier

Oct 10

ONT6:15 amOntario

12h 44m

1 stop

DCA9:59 pmWashington, D.C. Reagan-National

Oct 17

DCA6:00 pmWashington, D.C. Reagan-National

8h 50m

1 stop

ONT11:50 pmOntario

$248

Frontier

Oct 26

ONT11:52 amOntario

7h 07m

1 stop

DCA9:59 pmWashington, D.C. Reagan-National

Nov 11

DCA1:00 pmWashington, D.C. Reagan-National

13h 51m

1 stop

ONT11:51 pmOntario

$249

Frontier

Oct 10

ONT11:52 amOntario

7h 07m

1 stop

DCA9:59 pmWashington, D.C. Reagan-National

Oct 14

DCA7:00 amWashington, D.C. Reagan-National

19h 50m

1 stop

ONT11:50 pmOntario

$256

Delta flights from Ontario to District of Columbia

Our best Delta deals on Ontario to District of Columbia flight tickets

Delta

Feb 13

ONT12:00 pmOntario

7h 55m

1 stop

IAD10:55 pmWashington, D.C. Dulles Intl

Feb 20

IAD7:15 amWashington, D.C. Dulles Intl

8h 15m

1 stop

ONT12:30 pmOntario

$257

Delta

Oct 22

ONT1:35 pmOntario

7h 00m

1 stop

IAD11:35 pmWashington, D.C. Dulles Intl

Oct 28

IAD6:00 amWashington, D.C. Dulles Intl

8h 06m

1 stop

ONT11:06 amOntario

$259

Delta

Oct 16

ONT11:19 pmOntario

7h 51m

1 stop

IAD10:10 amWashington, D.C. Dulles Intl

Oct 21

IAD6:13 amWashington, D.C. Dulles Intl

9h 23m

1 stop

ONT12:36 pmOntario

$274

momondo Fare Finder

Use the filters below to find and compare flights from Ontario to District of Columbia that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

OntarioWashington, D.C.

ONT Ontario - IAD Washington, D.C. Dulles Intl

ONTIAD

Ontario

Wed 10/28

11:13 am-11:59 pm

1 stop9h 46m

Washington, D.C. Dulles Intl

Thu 10/29

7:02 am-1:16 pm

1 stop9h 14m

$248

OntarioWashington, D.C.

ONT Ontario - IAD Washington, D.C. Dulles Intl

ONTIAD

Ontario

Tue 10/27

11:13 am-11:59 pm

1 stop9h 46m

Washington, D.C. Dulles Intl

Thu 10/29

7:02 am-1:16 pm

1 stop9h 14m

$248

OntarioWashington, D.C.

ONT Ontario - IAD Washington, D.C. Dulles Intl

ONTIAD

Ontario

Tue 2/9

6:53 pm-6:00 am

1 stop8h 07m

Washington, D.C. Dulles Intl

Sat 2/13

12:40 pm-6:39 pm

1 stop8h 59m

$249

OntarioWashington, D.C.

ONT Ontario - DCA Washington, D.C. Reagan-National

ONTDCA

Ontario

Mon 10/26

11:55 pm-11:55 am

1 stop9h 00m

Washington, D.C. Reagan-National

Wed 10/28

6:00 am-2:45 pm

1 stop11h 45m

$251

OntarioWashington, D.C.

ONT Ontario - DCA Washington, D.C. Reagan-National

ONTDCA

Ontario

Thu 1/28

6:00 am-4:05 pm

1 stop7h 05m

Washington, D.C. Reagan-National

Tue 2/2

1:00 pm-8:20 pm

2 stops10h 20m

$254

OntarioWashington, D.C.

ONT Ontario - DCA Washington, D.C. Reagan-National

ONTDCA

Ontario

Sat 10/10

11:52 am-9:59 pm

1 stop7h 07m

Washington, D.C. Reagan-National

Wed 10/14

7:00 am-11:50 pm

1 stop19h 50m

$256

OntarioWashington, D.C.

ONT Ontario - DCA Washington, D.C. Reagan-National

ONTDCA

Ontario

Sat 11/14

11:52 am-9:50 pm

1 stop6h 58m

Washington, D.C. Reagan-National

Mon 11/23

1:54 pm-12:14 am

1 stop13h 20m

$257

OntarioWashington, D.C.

ONT Ontario - DCA Washington, D.C. Reagan-National

ONTDCA

Ontario

Mon 10/26

11:55 pm-11:55 am

1 stop9h 00m

Washington, D.C. Reagan-National

Wed 10/28

6:35 pm-7:40 am

2 stops16h 05m

$257

Quickest round-trip

OntarioWashington, D.C.

ONT Ontario - DCA Washington, D.C. Reagan-National

ONTDCA

Ontario

Sat 2/13

7:00 am-4:57 pm

1 stop6h 57m

Washington, D.C. Reagan-National

Sat 2/20

6:00 am-11:27 am

1 stop8h 27m

$257

OntarioWashington, D.C.

ONT Ontario - IAD Washington, D.C. Dulles Intl

ONTIAD

Ontario

Sat 2/13

12:00 pm-10:55 pm

1 stop7h 55m

Washington, D.C. Dulles Intl

Sat 2/20

7:15 am-12:30 pm

1 stop8h 15m

$257

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from Ontario to District of Columbia

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Prices

Airlines

What is the cheapest month to fly to District of Columbia?

In general, January is the cheapest month to fly from Ontario to District of Columbia. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $380. If you don’t want to visit District of Columbia in January, then you should wait until February to fly from Ontario, when ticket prices are also cheap, with an average price of $381.

What is the cheapest Ontario to District of Columbia flight route?

Fly from Ontario to Baltimore/Washington for the best Ontario - District of Columbia flight prices

What cabin class options are available on Ontario to District of Columbia flights?

There is only 1 cabin class available to choose from on Ontario to District of Columbia flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on Ontario to District of Columbia flights?

You could potentially save up to 40% on your flight if you consider stops on a Ontario to District of Columbia flight.

Cheap Ontario to District of Columbia flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Ontario to District of Columbia

Best Price Found	$84
Fastest flight time	6h 45m
Direct flights	None

The best one-way flight to District of Columbia from Ontario in the past 72 hours is $84. The best round-trip flight deal from Ontario to District of Columbia found on momondo in the last 72 hours is $248.

The fastest flight from Ontario to District of Columbia takes 6h 45m

There are no direct flights from Ontario to District of Columbia. There are no popular flight routes from Ontario to District of Columbia.

Search flight deals

Frequently asked questions about flying from Ontario to District of Columbia

When did momondo last update prices for flights from Ontario Airport to District of Columbia?
Prices for flights from Ontario Airport to District of Columbia refresh daily.
How many operators does momondo search for flights from Ontario Airport to District of Columbia?
As of September 2026, there are 5 operators available to choose from for flights from Ontario Airport to District of Columbia.
How old do you have to be to fly from Ontario Airport to District of Columbia?
The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Ontario Airport to District of Columbia.
What documentation or ID do you need to fly to District of Columbia?
The travel and health documents required for your trip to District of Columbia can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at District of Columbia. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

Best airlines flying from Ontario to District of Columbia

Compare and see reviews for airlines that fly from Ontario to District of Columbia with momondo

Airline	Rating	Free Cancellation	Price
Frontier	PriceFrom $172	Free Cancellation	Rating 5.6 2,600 reviews	Search Frontier flights
Delta	PriceFrom $183	Free Cancellation	Rating 7.8 8,579 reviews	Search Delta flights
United Airlines	PriceFrom $256	Free Cancellation	Rating 7.4 10,214 reviews	Search United Airlines flights
Southwest	PriceFrom $318	Free Cancellation	Rating 8.0 4,189 reviews	Search Southwest flights
American Airlines	PriceFrom $318	Free Cancellation	Rating 7.1 12,076 reviews	Search American Airlines flights
JetBlue	PriceFrom $361	Free Cancellation	Rating 7.1 3,035 reviews	Search JetBlue flights

Why use momondo?

Why should I use momondo to find a flight deal from Ontario to District of Columbia?

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Ontario to District of Columbia. momondo saves you time and could save you money on your trip.

Can I find flights from Ontario to District of Columbia with flexible booking policies on momondo?

Yes. All flights to District of Columbia from Ontario on momondo can be compared and filtered by various policies on offer, including flexible booking.

How can momondo help me find flights from Ontario to District of Columbia?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to District of Columbia from Ontario.

I’m not ready to book a flight from Ontario to District of Columbia right now. Can momondo alert me if prices change?

Yes momondo offers price alerts on flights to District of Columbia from Ontario. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.