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

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 7 different airlines that fly to District of Columbia on a routine basis, so you have a few additional options to choose from.

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 October 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.

5:25 pm - 6:20 amONT Ontario-IAD Washington, D.C. Dulles Intl

9h 55m1 stop Las Vegas Harry Reid Intl

12:31 pm - 7:08 pmIAD Washington, D.C. Dulles Intl-ONT Ontario

9h 37m1 stop Dallas/Fort Worth

$262Frontier

Sat, Oct 24 - Thu, Oct 29

8:03 pm - 11:36 amONT Ontario-IAD Washington, D.C. Dulles Intl

12h 33m1 stop Dallas/Fort Worth

12:31 pm - 7:08 pmIAD Washington, D.C. Dulles Intl-ONT Ontario

9h 37m1 stop Dallas/Fort Worth

$265Frontier

Mon, Nov 2 - Mon, Nov 9

5:35 am - 7:55 pmONT Ontario-DCA Washington, D.C. Reagan-National

11h 20m2 stops Phoenix Sky Harbor Intl Nashville Intl

4:00 pm - 9:45 pmDCA Washington, D.C. Reagan-National-ONT Ontario

8h 45m2 stops Omaha Eppley Airfield Denver Intl

$274Southwest

Sat, Nov 14 - Tue, Nov 17

9:25 am - 8:51 pmONT Ontario-IAD Washington, D.C. Dulles Intl

8h 26m1 stop San Francisco

2:38 pm - 8:15 pmIAD Washington, D.C. Dulles Intl-ONT Ontario

8h 37m1 stop San Francisco

$274United Airlines

Wed, Nov 4 - Fri, Nov 6

12:45 pm - 11:00 pmONT Ontario-DCA Washington, D.C. Reagan-National

7h 15m1 stop Houston Hobby

6:10 am - 1:10 pmDCA Washington, D.C. Reagan-National-ONT Ontario

10h 00m2 stops Nashville Intl Dallas Love Field

$275Southwest

Tue, Jan 12 - Tue, Jan 19

8:03 pm - 11:36 amONT Ontario-IAD Washington, D.C. Dulles Intl

12h 33m1 stop Dallas/Fort Worth

5:17 pm - 11:18 amIAD Washington, D.C. Dulles Intl-ONT Ontario

21h 01m1 stop Seattle/Tacoma Intl

$279Multiple Airlines

Mon, Nov 2 - Tue, Nov 3

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

9h 46m1 stop Seattle/Tacoma Intl

12:31 pm - 7:08 pmIAD Washington, D.C. Dulles Intl-ONT Ontario

9h 37m1 stop Dallas/Fort Worth

$280Multiple Airlines

Tue, Oct 27 - Thu, Oct 29

6:00 am - 4:48 pmONT Ontario-DCA Washington, D.C. Reagan-National

7h 48m1 stop Salt Lake City

5:00 pm - 10:48 pmDCA Washington, D.C. Reagan-National-ONT Ontario

8h 48m1 stop Salt Lake City

$286Delta

Fri, Dec 4 - Wed, Jan 6

1:11 pm - 11:47 pmONT Ontario-IAD Washington, D.C. Dulles Intl

7h 36m1 stop Salt Lake City

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

8h 15m1 stop Salt Lake City

$286Delta

Fri, Dec 4 - Wed, Jan 6

6:00 am - 6:32 pmONT Ontario-DCA Washington, D.C. Reagan-National

9h 32m1 stop Houston George Bush Intcntl

1:06 pm - 6:47 pmDCA Washington, D.C. Reagan-National-ONT Ontario

8h 41m1 stop Chicago O'Hare Intl

$304United Airlines

Tue, Oct 27 - Tue, Nov 24

Cheap last minute flights

Enter your travel dates to find the best prices.

5:25 pm - 6:20 amONT Ontario-IAD Washington, D.C. Dulles Intl

9h 55m1 stop Las Vegas Harry Reid Intl

6:00 am - 10:31 amIAD Washington, D.C. Dulles Intl-ONT Ontario

7h 31m1 stop Las Vegas Harry Reid Intl

$272Frontier

Wed, Oct 14 - Wed, Oct 21

5:25 pm - 6:20 amONT Ontario-IAD Washington, D.C. Dulles Intl

9h 55m1 stop Las Vegas Harry Reid Intl

6:00 am - 4:30 pmIAD Washington, D.C. Dulles Intl-ONT Ontario

13h 30m1 stop Las Vegas Harry Reid Intl

$272Frontier

Tue, Oct 13 - Tue, Oct 20

5:25 pm - 6:20 amONT Ontario-IAD Washington, D.C. Dulles Intl

9h 55m1 stop Las Vegas Harry Reid Intl

7:46 am - 3:13 pmIAD Washington, D.C. Dulles Intl-ONT Ontario

10h 27m1 stop Seattle/Tacoma Intl

$358Multiple Airlines

Sat, Oct 10 - Wed, Nov 11

10:04 am - 6:20 amONT Ontario-IAD Washington, D.C. Dulles Intl

17h 16m1 stop Las Vegas Harry Reid Intl

7:46 am - 6:17 pmIAD Washington, D.C. Dulles Intl-ONT Ontario

13h 31m1 stop Seattle/Tacoma Intl

$379Multiple Airlines

Sat, Oct 10 - Wed, Nov 11

7:00 am - 5:03 pmONT Ontario-DCA Washington, D.C. Reagan-National

7h 03m1 stop Chicago O'Hare Intl

4:34 pm - 9:40 pmDCA Washington, D.C. Reagan-National-ONT Ontario

8h 06m1 stop Houston George Bush Intcntl

$422United Airlines

Sat, Oct 10 - Wed, Nov 11

12:16 pm - 12:42 amONT Ontario-IAD Washington, D.C. Dulles Intl

9h 26m1 stop Atlanta Hartsfield-Jackson

7:00 am - 12:17 pmIAD Washington, D.C. Dulles Intl-ONT Ontario

8h 17m1 stop Salt Lake City

$422Delta

Sat, Oct 10 - Sat, Nov 14

1:35 pm - 11:35 pmONT Ontario-IAD Washington, D.C. Dulles Intl

7h 00m1 stop Salt Lake City

6:13 am - 12:36 pmIAD Washington, D.C. Dulles Intl-ONT Ontario

9h 23m1 stop Salt Lake City

$422Delta

Tue, Oct 13 - Tue, Nov 3

9:40 am - 8:20 pmONT Ontario-DCA Washington, D.C. Reagan-National

7h 40m1 stop Las Vegas Harry Reid Intl

6:50 pm - 8:20 amDCA Washington, D.C. Reagan-National-ONT Ontario

16h 30m2 stops Chicago Midway Oakland

$446Southwest

Sat, Oct 10 - Wed, Nov 11

5:30 am - 6:35 pmONT Ontario-DCA Washington, D.C. Reagan-National

10h 05m2 stops Phoenix Sky Harbor Intl Chicago Midway

6:50 pm - 8:20 amDCA Washington, D.C. Reagan-National-ONT Ontario

16h 30m2 stops Chicago Midway Oakland

$509Southwest

Sat, Oct 10 - Wed, Nov 11

11:10 am - 10:30 pmONT Ontario-DCA Washington, D.C. Reagan-National

8h 20m1 stop San Francisco

2:25 pm - 9:40 pmDCA Washington, D.C. Reagan-National-ONT Ontario

10h 15m1 stop Houston George Bush Intcntl

$552United Airlines

Sat, Oct 10 - Wed, Nov 11

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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 24

ONT5:25 pmOntario

9h 55m

1 stop

IAD6:20 amWashington, D.C. Dulles Intl

Oct 29

IAD12:31 pmWashington, D.C. Dulles Intl

9h 37m

1 stop

ONT7:08 pmOntario

$262

Frontier

Nov 2

ONT8:03 pmOntario

12h 33m

1 stop

IAD11:36 amWashington, D.C. Dulles Intl

Nov 9

IAD12:31 pmWashington, D.C. Dulles Intl

9h 37m

1 stop

ONT7:08 pmOntario

$265

Frontier

Nov 20

ONT2:01 pmOntario

12h 09m

1 stop

IAD5:10 amWashington, D.C. Dulles Intl

Nov 23

IAD1:09 pmWashington, D.C. Dulles Intl

9h 27m

1 stop

ONT7:36 pmOntario

$267

United Airlines flights from Ontario to District of Columbia

Our best United Airlines deals on Ontario to District of Columbia flight tickets

United Airlines

Nov 4

ONT9:25 amOntario

8h 26m

1 stop

IAD8:51 pmWashington, D.C. Dulles Intl

Nov 6

IAD2:38 pmWashington, D.C. Dulles Intl

8h 37m

1 stop

ONT8:15 pmOntario

$274

United Airlines

Oct 27

ONT6:00 amOntario

9h 32m

1 stop

DCA6:32 pmWashington, D.C. Reagan-National

Nov 24

DCA1:06 pmWashington, D.C. Reagan-National

8h 41m

1 stop

ONT6:47 pmOntario

$304

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

Sat 10/24

5:25 pm-6:20 am

1 stop9h 55m

Washington, D.C. Dulles Intl

Thu 10/29

12:31 pm-7:08 pm

1 stop9h 37m

$262

OntarioWashington, D.C.

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

ONTIAD

Ontario

Mon 11/2

8:03 pm-11:36 am

1 stop12h 33m

Washington, D.C. Dulles Intl

Mon 11/9

12:31 pm-7:08 pm

1 stop9h 37m

$265

OntarioWashington, D.C.

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

ONTDCA

Ontario

Sat 11/14

5:35 am-7:55 pm

2 stops11h 20m

Washington, D.C. Reagan-National

Tue 11/17

4:00 pm-9:45 pm

2 stops8h 45m

$274

OntarioWashington, D.C.

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

ONTIAD

Ontario

Wed 11/4

9:25 am-8:51 pm

1 stop8h 26m

Washington, D.C. Dulles Intl

Fri 11/6

2:38 pm-8:15 pm

1 stop8h 37m

$274

OntarioWashington, D.C.

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

ONTDCA

Ontario

Tue 1/12

12:45 pm-11:00 pm

1 stop7h 15m

Washington, D.C. Reagan-National

Tue 1/19

6:10 am-1:10 pm

2 stops10h 00m

$275

OntarioWashington, D.C.

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

ONTIAD

Ontario

Mon 11/2

8:03 pm-11:36 am

1 stop12h 33m

Washington, D.C. Dulles Intl

Tue 11/3

5:17 pm-11:18 am

1 stop21h 01m

$279

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

12:31 pm-7:08 pm

1 stop9h 37m

$280

OntarioWashington, D.C.

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

ONTDCA

Ontario

Fri 12/4

6:00 am-4:48 pm

1 stop7h 48m

Washington, D.C. Reagan-National

Wed 1/6

5:00 pm-10:48 pm

1 stop8h 48m

$286

Quickest round-trip

OntarioWashington, D.C.

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

ONTIAD

Ontario

Fri 12/4

1:11 pm-11:47 pm

1 stop7h 36m

Washington, D.C. Dulles Intl

Wed 1/6

7:15 am-12:30 pm

1 stop8h 15m

$286

OntarioWashington, D.C.

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

ONTDCA

Ontario

Tue 10/27

6:00 am-6:32 pm

1 stop9h 32m

Washington, D.C. Reagan-National

Tue 11/24

1:06 pm-6:47 pm

1 stop8h 41m

$304

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 $351. 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 29% 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 28m
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 $262.

The fastest flight from Ontario to District of Columbia takes 6h 28m

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 October 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 2,551 reviews	Search Frontier flights
Delta	PriceFrom $183	Free Cancellation	Rating 7.8 8,633 reviews	Search Delta flights
United Airlines	PriceFrom $272	Free Cancellation	Rating 7.4 10,308 reviews	Search United Airlines flights
American Airlines	PriceFrom $318	Free Cancellation	Rating 7.0 12,134 reviews	Search American Airlines flights
Southwest	PriceFrom $340	Free Cancellation	Rating 7.9 4,219 reviews	Search Southwest flights
JetBlue	PriceFrom $361	Free Cancellation	Rating 7.1 3,045 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.