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 Alaska 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.

$85 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.

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

17h 16m1 stop Las Vegas Harry Reid Intl

6:00 am - 11:16 amIAD Washington, D.C. Dulles Intl-ONT Ontario

8h 16m1 stop Las Vegas Harry Reid Intl

$257Frontier

Tue, Oct 20 - Fri, Oct 23

3:40 pm - 5:01 amONT Ontario-IAD Washington, D.C. Dulles Intl

10h 21m1 stop Las Vegas Harry Reid Intl

12:30 pm - 6:39 pmIAD Washington, D.C. Dulles Intl-ONT Ontario

9h 09m1 stop Dallas/Fort Worth

$257Frontier

Tue, Sep 8 - Fri, Sep 11

8:24 pm - 6:20 amONT Ontario-IAD Washington, D.C. Dulles Intl

6h 56m1 stop Las Vegas Harry Reid Intl

7:00 am - 2:16 pmIAD Washington, D.C. Dulles Intl-ONT Ontario

10h 16m1 stop Seattle/Tacoma Intl

$285Multiple Airlines

Thu, Sep 10 - Wed, Sep 16

3:14 pm - 5:40 amONT Ontario-IAD Washington, D.C. Dulles Intl

11h 26m1 stop Seattle/Tacoma Intl

6:00 am - 11:22 amIAD Washington, D.C. Dulles Intl-ONT Ontario

8h 22m1 stop Las Vegas Harry Reid Intl

$292Multiple Airlines

Wed, Sep 23 - Mon, Sep 28

8:25 am - 8:24 pmONT Ontario-IAD Washington, D.C. Dulles Intl

8h 59m1 stop Dallas/Fort Worth

6:52 am - 1:25 pmIAD Washington, D.C. Dulles Intl-ONT Ontario

9h 33m1 stop Dallas/Fort Worth

$351American Airlines

Tue, Sep 15 - Sat, Sep 26

10:31 am - 11:23 pmONT Ontario-IAD Washington, D.C. Dulles Intl

9h 52m1 stop Dallas/Fort Worth

7:14 am - 11:55 amIAD Washington, D.C. Dulles Intl-ONT Ontario

7h 41m1 stop Dallas/Fort Worth

$351American Airlines

Sat, Jan 30 - Tue, Feb 2

6:45 am - 5:13 pmONT Ontario-IAD Washington, D.C. Dulles Intl

7h 28m1 stop Chicago O'Hare Intl

5:55 pm - 11:06 pmIAD Washington, D.C. Dulles Intl-ONT Ontario

8h 11m1 stop San Francisco

$351United Airlines

Thu, Jan 21 - Mon, Jan 25

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

8h 26m1 stop San Francisco

4:10 pm - 8:51 pmIAD Washington, D.C. Dulles Intl-ONT Ontario

7h 41m1 stop Denver Intl

$351United Airlines

Thu, Oct 29 - Mon, Nov 2

1:25 pm - 11:37 pmONT Ontario-IAD Washington, D.C. Dulles Intl

7h 12m1 stop Salt Lake City

7:00 am - 12:10 pmIAD Washington, D.C. Dulles Intl-ONT Ontario

8h 10m1 stop Salt Lake City

$351Delta

Tue, Nov 17 - Mon, Dec 7

1:25 pm - 11:37 pmONT Ontario-IAD Washington, D.C. Dulles Intl

7h 12m1 stop Salt Lake City

6:00 am - 11:10 amIAD Washington, D.C. Dulles Intl-ONT Ontario

8h 10m1 stop Atlanta Hartsfield-Jackson

$351Delta

Tue, Nov 17 - Wed, Dec 2

Cheap last minute flights

Enter your travel dates to find the best prices.

10:49 am - 9:59 pmONT Ontario-DCA Washington, D.C. Reagan-National

8h 10m1 stop Denver Intl

6:00 pm - 10:30 amDCA Washington, D.C. Reagan-National-ONT Ontario

19h 30m1 stop Denver Intl

$318Frontier

Mon, Aug 24 - Tue, Sep 15

10:49 am - 9:59 pmONT Ontario-DCA Washington, D.C. Reagan-National

8h 10m1 stop Denver Intl

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

8h 47m1 stop Denver Intl

$318Frontier

Mon, Aug 24 - Sat, Sep 12

10:49 am - 9:59 pmONT Ontario-DCA Washington, D.C. Reagan-National

8h 10m1 stop Denver Intl

5:27 pm - 3:47 pmDCA Washington, D.C. Reagan-National-ONT Ontario

25h 20m2 stops Portland Santa Rosa Sonoma County

$523Multiple Airlines

Mon, Aug 24 - Tue, Sep 15

12:00 pm - 11:59 pmONT Ontario-IAD Washington, D.C. Dulles Intl

8h 59m1 stop Seattle/Tacoma Intl

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

10h 09m1 stop Seattle/Tacoma Intl

$546Alaska Airlines

Mon, Aug 24 - Tue, Aug 25

12:00 pm - 11:48 pmONT Ontario-DCA Washington, D.C. Reagan-National

8h 48m1 stop Atlanta Hartsfield-Jackson

5:59 pm - 11:34 pmDCA Washington, D.C. Reagan-National-ONT Ontario

8h 35m1 stop Salt Lake City

$636Delta

Mon, Aug 24 - Tue, Aug 25

7:05 am - 6:33 pmONT Ontario-DCA Washington, D.C. Reagan-National

8h 28m1 stop Atlanta Hartsfield-Jackson

5:59 pm - 10:23 pmDCA Washington, D.C. Reagan-National-ONT Ontario

7h 24m1 stop Salt Lake City

$655Delta

Sat, Aug 22 - Sat, Aug 29

6:15 am - 8:56 pmONT Ontario-IAD Washington, D.C. Dulles Intl

11h 41m2 stops Phoenix Sky Harbor Intl Charlotte Douglas

6:38 pm - 10:59 pmIAD Washington, D.C. Dulles Intl-ONT Ontario

7h 21m1 stop Dallas/Fort Worth

$660American Airlines

Sat, Aug 22 - Sun, Aug 30

6:00 am - 6:14 pmONT Ontario-DCA Washington, D.C. Reagan-National

9h 14m2 stops Dallas/Fort Worth Charlotte Douglas

12:57 pm - 6:47 pmDCA Washington, D.C. Reagan-National-ONT Ontario

8h 50m2 stops Charlotte Douglas Dallas/Fort Worth

$665American Airlines

Fri, Aug 21 - Tue, Aug 25

7:00 am - 8:09 pmONT Ontario-DCA Washington, D.C. Reagan-National

10h 09m1 stop Chicago O'Hare Intl

1:04 pm - 10:59 pmDCA Washington, D.C. Reagan-National-ONT Ontario

12h 55m2 stops Chicago O'Hare Intl San Francisco

$723United Airlines

Mon, Aug 24 - Mon, Aug 31

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

7h 01m1 stop Denver Intl

2:47 pm - 8:01 pmIAD Washington, D.C. Dulles Intl-ONT Ontario

8h 14m1 stop San Francisco

$738United Airlines

Sat, Aug 22 - Tue, Aug 25

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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 25

ONT8:24 pmOntario

6h 56m

1 stop

IAD6:20 amWashington, D.C. Dulles Intl

Sep 28

IAD6:00 amWashington, D.C. Dulles Intl

8h 22m

1 stop

ONT11:22 amOntario

$257

Frontier

Sep 9

ONT11:45 amOntario

7h 14m

1 stop

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

Sep 12

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

8h 47m

1 stop

ONT11:47 pmOntario

$258

Frontier

Sep 7

ONT10:17 pmOntario

27h 44m

1 stop

IAD5:01 amWashington, D.C. Dulles Intl

Oct 23

IAD12:30 pmWashington, D.C. Dulles Intl

9h 38m

1 stop

ONT7:08 pmOntario

$260

Delta flights from Ontario to District of Columbia

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

Delta

Sep 2

ONT12:00 pmOntario

9h 34m

1 stop

IAD12:34 amWashington, D.C. Dulles Intl

Sep 9

IAD3:15 pmWashington, D.C. Dulles Intl

8h 09m

1 stop

ONT8:24 pmOntario

$369

Delta

Sep 1

ONT1:06 pmOntario

7h 33m

1 stop

IAD11:39 pmWashington, D.C. Dulles Intl

Sep 8

IAD3:15 pmWashington, D.C. Dulles Intl

8h 09m

1 stop

ONT8:24 pmOntario

$384

Delta

Sep 1

ONT12:00 pmOntario

9h 34m

1 stop

IAD12:34 amWashington, D.C. Dulles Intl

Sep 2

IAD3:03 pmWashington, D.C. Dulles Intl

7h 50m

1 stop

ONT7:53 pmOntario

$387

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

Tue 10/20

10:04 am-6:20 am

1 stop17h 16m

Washington, D.C. Dulles Intl

Fri 10/23

6:00 am-11:16 am

1 stop8h 16m

$257

OntarioWashington, D.C.

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

ONTIAD

Ontario

Tue 9/8

3:40 pm-5:01 am

1 stop10h 21m

Washington, D.C. Dulles Intl

Fri 9/11

12:30 pm-6:39 pm

1 stop9h 09m

$257

OntarioWashington, D.C.

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

ONTIAD

Ontario

Thu 9/10

8:24 pm-6:20 am

1 stop6h 56m

Washington, D.C. Dulles Intl

Wed 9/16

7:00 am-2:16 pm

1 stop10h 16m

$285

OntarioWashington, D.C.

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

ONTIAD

Ontario

Wed 9/23

3:14 pm-5:40 am

1 stop11h 26m

Washington, D.C. Dulles Intl

Mon 9/28

6:00 am-11:22 am

1 stop8h 22m

$292

OntarioWashington, D.C.

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

ONTIAD

Ontario

Tue 9/15

8:25 am-8:24 pm

1 stop8h 59m

Washington, D.C. Dulles Intl

Sat 9/26

6:52 am-1:25 pm

1 stop9h 33m

$351

OntarioWashington, D.C.

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

ONTIAD

Ontario

Sat 1/30

10:31 am-11:23 pm

1 stop9h 52m

Washington, D.C. Dulles Intl

Tue 2/2

7:14 am-11:55 am

1 stop7h 41m

$351

OntarioWashington, D.C.

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

ONTIAD

Ontario

Thu 1/21

6:45 am-5:13 pm

1 stop7h 28m

Washington, D.C. Dulles Intl

Mon 1/25

5:55 pm-11:06 pm

1 stop8h 11m

$351

OntarioWashington, D.C.

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

ONTIAD

Ontario

Thu 10/29

9:25 am-8:51 pm

1 stop8h 26m

Washington, D.C. Dulles Intl

Mon 11/2

4:10 pm-8:51 pm

1 stop7h 41m

$351

Quickest round-trip

OntarioWashington, D.C.

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

ONTIAD

Ontario

Tue 11/17

1:25 pm-11:37 pm

1 stop7h 12m

Washington, D.C. Dulles Intl

Mon 12/7

7:00 am-12:10 pm

1 stop8h 10m

$351

OntarioWashington, D.C.

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

ONTIAD

Ontario

Tue 11/17

1:25 pm-11:37 pm

1 stop7h 12m

Washington, D.C. Dulles Intl

Wed 12/2

6:00 am-11:10 am

1 stop8h 10m

$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 $323. 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	$114
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 $114. The best round-trip flight deal from Ontario to District of Columbia found on momondo in the last 72 hours is $257.

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 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 2,661 reviews	Search Frontier flights
Delta	PriceFrom $183	Free Cancellation	Rating 7.8 8,500 reviews	Search Delta flights
United Airlines	PriceFrom $226	Free Cancellation	Rating 7.4 10,104 reviews	Search United Airlines flights
American Airlines	PriceFrom $256	Free Cancellation	Rating 7.1 11,964 reviews	Search American Airlines flights
Southwest	PriceFrom $304	Free Cancellation	Rating 8.0 4,217 reviews	Search Southwest flights
JetBlue	PriceFrom $361	Free Cancellation	Rating 7.1 3,038 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.