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, Alaska Airlines, 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 August 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.

$123 Cheap Flights from Ontario to District of Columbia in 2026

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.

11:52 am - 4:47 pmONT Ontario-DCA Washington, D.C. Reagan-National

25h 55m1 stop Denver Intl

6:00 pm - 11:51 pmDCA Washington, D.C. Reagan-National-ONT Ontario

8h 51m1 stop Denver Intl

$261Frontier

Mon, Oct 26 - Thu, Oct 29

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

6h 58m1 stop Denver Intl

6:00 pm - 11:51 pmDCA Washington, D.C. Reagan-National-ONT Ontario

8h 51m1 stop Denver Intl

$261Frontier

Sat, Oct 31 - Mon, Nov 2

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

8h 47m1 stop Seattle/Tacoma Intl

6:00 am - 7:04 amIAD Washington, D.C. Dulles Intl-ONT Ontario

28h 04m1 stop Las Vegas Harry Reid Intl

$307Multiple Airlines

Tue, Sep 29 - Wed, Sep 30

8:35 pm - 6:20 amONT Ontario-IAD Washington, D.C. Dulles Intl

6h 45m1 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

$307Multiple Airlines

Mon, Oct 19 - Tue, Oct 27

7:34 pm - 7:00 amONT Ontario-DCA Washington, D.C. Reagan-National

8h 26m1 stop Phoenix Sky Harbor Intl

6:59 am - 11:53 amDCA Washington, D.C. Reagan-National-ONT Ontario

7h 54m1 stop Dallas/Fort Worth

$351American Airlines

Wed, Oct 21 - Tue, Oct 27

11:59 pm - 11:00 amONT Ontario-DCA Washington, D.C. Reagan-National

8h 01m1 stop Dallas/Fort Worth

7:12 am - 1:31 pmDCA Washington, D.C. Reagan-National-ONT Ontario

9h 19m1 stop Dallas/Fort Worth

$351American Airlines

Mon, Nov 2 - Sat, Nov 7

11:10 am - 10:53 pmONT Ontario-DCA Washington, D.C. Reagan-National

8h 43m1 stop San Francisco

4:09 pm - 8:51 pmDCA Washington, D.C. Reagan-National-ONT Ontario

7h 42m1 stop Denver Intl

$351United Airlines

Wed, Oct 14 - Mon, Nov 2

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

$351United Airlines

Mon, Nov 9 - Sat, Nov 14

7:00 am - 7:14 pmONT Ontario-DCA Washington, D.C. Reagan-National

9h 14m1 stop Atlanta Hartsfield-Jackson

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

8h 27m1 stop Atlanta Hartsfield-Jackson

$351Delta

Wed, Jan 13 - Sat, Jan 23

12:19 pm - 11:44 pmONT Ontario-DCA Washington, D.C. Reagan-National

8h 25m1 stop Atlanta Hartsfield-Jackson

6:00 am - 11:09 amDCA Washington, D.C. Reagan-National-ONT Ontario

8h 09m1 stop Atlanta Hartsfield-Jackson

$351Delta

Thu, Sep 17 - Wed, Sep 23

Cheap last minute flights

Enter your travel dates to find the best prices.

6:00 am - 9:59 pmONT Ontario-DCA Washington, D.C. Reagan-National

12h 59m1 stop Denver Intl

1:06 pm - 11:47 pmDCA Washington, D.C. Reagan-National-ONT Ontario

13h 41m1 stop Denver Intl

$330Frontier

Wed, Aug 26 - Thu, Sep 10

6:00 am - 9:59 pmONT Ontario-DCA Washington, D.C. Reagan-National

12h 59m1 stop Denver Intl

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

8h 47m1 stop Denver Intl

$330Frontier

Wed, Aug 26 - Sat, Oct 3

8:17 am - 6:29 pmONT Ontario-IAD Washington, D.C. Dulles Intl

7h 12m1 stop Dallas/Fort Worth

7:00 am - 2:09 pmIAD Washington, D.C. Dulles Intl-ONT Ontario

10h 09m1 stop Seattle/Tacoma Intl

$440Multiple Airlines

Sun, Aug 30 - Sun, Sep 6

10:17 pm - 8:04 amONT Ontario-IAD Washington, D.C. Dulles Intl

6h 47m1 stop Las Vegas Harry Reid Intl

5:47 pm - 11:04 amIAD Washington, D.C. Dulles Intl-ONT Ontario

20h 17m1 stop Seattle/Tacoma Intl

$442Multiple Airlines

Fri, Aug 28 - Sat, Sep 5

12:00 pm - 12:34 amONT Ontario-IAD Washington, D.C. Dulles Intl

9h 34m1 stop Atlanta Hartsfield-Jackson

6:00 am - 10:42 amIAD Washington, D.C. Dulles Intl-ONT Ontario

7h 42m1 stop Atlanta Hartsfield-Jackson

$490Delta

Wed, Aug 26 - Sat, Sep 5

12:00 pm - 11:49 amONT Ontario-IAD Washington, D.C. Dulles Intl

20h 49m2 stops Atlanta Hartsfield-Jackson New York John F Kennedy Intl

7:00 am - 12:14 pmIAD Washington, D.C. Dulles Intl-ONT Ontario

8h 14m1 stop Salt Lake City

$522Delta

Fri, Aug 28 - Tue, Sep 15

6:00 am - 6:27 pmONT Ontario-IAD Washington, D.C. Dulles Intl

9h 27m1 stop Dallas/Fort Worth

1:23 pm - 10:59 pmIAD Washington, D.C. Dulles Intl-ONT Ontario

12h 36m2 stops Charlotte Douglas Dallas/Fort Worth

$572American Airlines

Wed, Aug 26 - Sat, Aug 29

6:15 am - 6:27 pmONT Ontario-IAD Washington, D.C. Dulles Intl

9h 12m2 stops Phoenix Sky Harbor Intl Dallas/Fort Worth

2:53 pm - 6:58 pmIAD Washington, D.C. Dulles Intl-ONT Ontario

7h 05m1 stop Dallas/Fort Worth

$572American Airlines

Sat, Aug 29 - Sat, Sep 5

5:50 am - 6:00 pmONT Ontario-DCA Washington, D.C. Reagan-National

9h 10m2 stops Phoenix Sky Harbor Intl Dallas Love Field

6:05 am - 12:40 pmDCA Washington, D.C. Reagan-National-ONT Ontario

9h 35m2 stops Chicago Midway Las Vegas Harry Reid Intl

$577Southwest

Sat, Aug 29 - Wed, Sep 2

9:25 am - 8:50 pmONT Ontario-DCA Washington, D.C. Reagan-National

8h 25m2 stops Denver Intl Dallas Love Field

2:30 pm - 8:55 pmDCA Washington, D.C. Reagan-National-ONT Ontario

9h 25m2 stops Nashville Intl Denver Intl

$603Southwest

Sat, Aug 29 - Sat, Sep 5

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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

Sep 10

ONT8:24 pmOntario

6h 56m

1 stop

IAD6:20 amWashington, D.C. Dulles Intl

Sep 16

IAD6:00 amWashington, D.C. Dulles Intl

28h 04m

1 stop

ONT7:04 amOntario

$261

Frontier

Sep 12

ONT10:04 amOntario

17h 16m

1 stop

IAD6:20 amWashington, D.C. Dulles Intl

Sep 16

IAD6:00 amWashington, D.C. Dulles Intl

28h 04m

1 stop

ONT7:04 amOntario

$262

Frontier

Nov 9

ONT11:52 amOntario

25h 55m

1 stop

DCA4:47 pmWashington, D.C. Reagan-National

Nov 12

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

13h 51m

1 stop

ONT11:51 pmOntario

$265

Alaska Airlines flights from Ontario to District of Columbia

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

Alaska Airlines

Oct 6

ONT11:13 amOntario

9h 46m

1 stop

IAD11:59 pmWashington, D.C. Dulles Intl

Oct 31

IAD7:02 amWashington, D.C. Dulles Intl

9h 14m

1 stop

ONT1:16 pmOntario

$351

Alaska Airlines

Sep 5

ONT3:07 pmOntario

11h 33m

1 stop

IAD5:40 amWashington, D.C. Dulles Intl

Sep 22

IAD7:00 amWashington, D.C. Dulles Intl

10h 16m

1 stop

ONT2:16 pmOntario

$382

Alaska Airlines

Sep 5

ONT3:07 pmOntario

11h 33m

1 stop

IAD5:40 amWashington, D.C. Dulles Intl

Sep 23

IAD7:00 amWashington, D.C. Dulles Intl

10h 16m

1 stop

ONT2:16 pmOntario

$406

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 - DCA Washington, D.C. Reagan-National

ONTDCA

Ontario

Mon 10/26

11:52 am-4:47 pm

1 stop25h 55m

Washington, D.C. Reagan-National

Thu 10/29

6:00 pm-11:51 pm

1 stop8h 51m

$261

Quickest round-trip

OntarioWashington, D.C.

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

ONTDCA

Ontario

Sat 10/31

11:52 am-9:50 pm

1 stop6h 58m

Washington, D.C. Reagan-National

Mon 11/2

6:00 pm-11:51 pm

1 stop8h 51m

$261

OntarioWashington, D.C.

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

ONTIAD

Ontario

Tue 9/29

12:12 pm-11:59 pm

1 stop8h 47m

Washington, D.C. Dulles Intl

Wed 9/30

6:00 am-7:04 am

1 stop28h 04m

$307

OntarioWashington, D.C.

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

ONTIAD

Ontario

Mon 10/19

8:35 pm-6:20 am

1 stop6h 45m

Washington, D.C. Dulles Intl

Tue 10/27

7:02 am-1:16 pm

1 stop9h 14m

$307

OntarioWashington, D.C.

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

ONTDCA

Ontario

Wed 10/21

7:34 pm-7:00 am

1 stop8h 26m

Washington, D.C. Reagan-National

Tue 10/27

6:59 am-11:53 am

1 stop7h 54m

$351

OntarioWashington, D.C.

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

ONTDCA

Ontario

Mon 11/2

11:59 pm-11:00 am

1 stop8h 01m

Washington, D.C. Reagan-National

Sat 11/7

7:12 am-1:31 pm

1 stop9h 19m

$351

OntarioWashington, D.C.

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

ONTDCA

Ontario

Wed 10/14

11:10 am-10:53 pm

1 stop8h 43m

Washington, D.C. Reagan-National

Mon 11/2

4:09 pm-8:51 pm

1 stop7h 42m

$351

OntarioWashington, D.C.

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

ONTIAD

Ontario

Mon 11/9

9:25 am-8:51 pm

1 stop8h 26m

Washington, D.C. Dulles Intl

Sat 11/14

2:38 pm-8:15 pm

1 stop8h 37m

$351

OntarioWashington, D.C.

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

ONTDCA

Ontario

Wed 1/13

7:00 am-7:14 pm

1 stop9h 14m

Washington, D.C. Reagan-National

Sat 1/23

6:00 am-11:27 am

1 stop8h 27m

$351

OntarioWashington, D.C.

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

ONTDCA

Ontario

Thu 9/17

12:19 pm-11:44 pm

1 stop8h 25m

Washington, D.C. Reagan-National

Wed 9/23

6:00 am-11:09 am

1 stop8h 09m

$351

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, September 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 $330. If you don’t want to visit District of Columbia in September, then you should wait until January to fly from Ontario, when ticket prices are also cheap, with an average price of $380.

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	$123
Fastest flight time	6h 33m
Direct flights	None

The best one-way flight to District of Columbia from Ontario in the past 72 hours is $123. The best round-trip flight deal from Ontario to District of Columbia found on momondo in the last 72 hours is $261.

The fastest flight from Ontario to District of Columbia takes 6h 33m

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 August 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 $105	Free Cancellation	Rating 5.6 2,649 reviews	Search Frontier flights
Delta	PriceFrom $183	Free Cancellation	Rating 7.8 8,530 reviews	Search Delta flights
American Airlines	PriceFrom $256	Free Cancellation	Rating 7.1 11,990 reviews	Search American Airlines flights
United Airlines	PriceFrom $256	Free Cancellation	Rating 7.4 10,121 reviews	Search United Airlines flights
Southwest	PriceFrom $318	Free Cancellation	Rating 8.0 4,208 reviews	Search Southwest flights
JetBlue	PriceFrom $361	Free Cancellation	Rating 7.1 3,031 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.