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

Delta, Frontier, 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 November 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.

$105 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.

10:55 am - 5:10 amONT Ontario-IAD Washington, D.C. Dulles Intl

15h 15m1 stop Las Vegas Harry Reid Intl

6:40 am - 9:28 amIAD Washington, D.C. Dulles Intl-ONT Ontario

29h 48m2 stops Atlanta Hartsfield-Jackson Dallas/Fort Worth

$221Frontier

Wed, Nov 25 - Tue, Dec 1

10:55 am - 5:10 amONT Ontario-IAD Washington, D.C. Dulles Intl

15h 15m1 stop Las Vegas Harry Reid Intl

10:33 pm - 9:28 amIAD Washington, D.C. Dulles Intl-ONT Ontario

13h 55m2 stops Atlanta Hartsfield-Jackson Dallas/Fort Worth

$227Frontier

Mon, Nov 23 - Tue, Dec 1

11:30 am - 9:59 pmONT Ontario-DCA Washington, D.C. Reagan-National

7h 29m1 stop Denver Intl

5:20 pm - 11:54 pmDCA Washington, D.C. Reagan-National-ONT Ontario

9h 34m1 stop Portland

$312Multiple Airlines

Tue, Dec 8 - Sat, Dec 12

7:00 am - 5:24 pmONT Ontario-IAD Washington, D.C. Dulles Intl

7h 24m1 stop Chicago O'Hare Intl

2:35 pm - 8:38 pmIAD Washington, D.C. Dulles Intl-ONT Ontario

9h 03m1 stop San Francisco

$331United Airlines

Thu, Nov 26 - Thu, Dec 3

5:01 pm - 5:35 amONT Ontario-IAD Washington, D.C. Dulles Intl

9h 34m1 stop Seattle/Tacoma Intl

7:00 am - 4:05 pmIAD Washington, D.C. Dulles Intl-ONT Ontario

12h 05m1 stop Seattle/Tacoma Intl

$331Alaska Airlines

Thu, Dec 10 - Tue, Dec 15

5:50 am - 4:05 pmONT Ontario-DCA Washington, D.C. Reagan-National

7h 15m1 stop Las Vegas Harry Reid Intl

6:10 am - 10:45 amDCA Washington, D.C. Reagan-National-ONT Ontario

7h 35m1 stop Dallas Love Field

$341Southwest

Thu, Nov 26 - Thu, Dec 3

6:30 am - 4:30 pmONT Ontario-DCA Washington, D.C. Reagan-National

7h 00m1 stop Chicago Midway

7:25 pm - 11:50 pmDCA Washington, D.C. Reagan-National-ONT Ontario

7h 25m1 stop Chicago Midway

$351Southwest

Tue, Feb 2 - Fri, Feb 5

12:45 pm - 11:59 pmONT Ontario-DCA Washington, D.C. Reagan-National

8h 14m1 stop Dallas/Fort Worth

3:30 pm - 11:13 pmDCA Washington, D.C. Reagan-National-ONT Ontario

10h 43m1 stop Dallas/Fort Worth

$351American Airlines

Thu, Jan 28 - Tue, Feb 2

1:02 pm - 10:46 pmONT Ontario-DCA Washington, D.C. Reagan-National

6h 44m1 stop Dallas/Fort Worth

4:59 pm - 10:58 pmDCA Washington, D.C. Reagan-National-ONT Ontario

8h 59m1 stop Dallas/Fort Worth

$351American Airlines

Tue, Dec 8 - Sat, Dec 12

6:37 pm - 5:25 amONT Ontario-IAD Washington, D.C. Dulles Intl

7h 48m1 stop San Francisco

2:39 pm - 10:15 pmIAD Washington, D.C. Dulles Intl-ONT Ontario

10h 36m1 stop Houston George Bush Intcntl

$351United Airlines

Mon, Feb 1 - Fri, Feb 5

Cheap last minute flights

Enter your travel dates to find the best prices.

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

$330Frontier

Wed, Nov 4 - Thu, Nov 26

6:30 am - 4:47 pmONT Ontario-DCA Washington, D.C. Reagan-National

7h 17m1 stop Denver Intl

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

13h 20m1 stop Denver Intl

$330Frontier

Sat, Nov 7 - Thu, Nov 26

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

12h 33m1 stop Dallas/Fort Worth

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

10h 27m1 stop Seattle/Tacoma Intl

$483Multiple Airlines

Sun, Nov 8 - Sat, Nov 14

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

12h 33m1 stop Dallas/Fort Worth

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

10h 27m1 stop Seattle/Tacoma Intl

$484Multiple Airlines

Mon, Nov 9 - Sat, Nov 14

7:07 am - 5:10 pmONT Ontario-IAD Washington, D.C. Dulles Intl

7h 03m1 stop Atlanta Hartsfield-Jackson

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

8h 17m1 stop Salt Lake City

$530Delta

Sat, Nov 7 - Sat, Nov 14

7:07 am - 5:10 pmONT Ontario-IAD Washington, D.C. Dulles Intl

7h 03m1 stop Atlanta Hartsfield-Jackson

3:00 pm - 7:49 pmIAD Washington, D.C. Dulles Intl-ONT Ontario

7h 49m1 stop Atlanta Hartsfield-Jackson

$530Delta

Sat, Nov 7 - Sat, Nov 14

12:42 pm - 11:30 pmONT Ontario-IAD Washington, D.C. Dulles Intl

7h 48m1 stop Dallas/Fort Worth

4:39 pm - 11:46 pmIAD Washington, D.C. Dulles Intl-ONT Ontario

10h 07m1 stop Dallas/Fort Worth

$607American Airlines

Sat, Nov 7 - Wed, Nov 11

6:00 am - 4:08 pmONT Ontario-IAD Washington, D.C. Dulles Intl

7h 08m1 stop San Francisco

5:38 pm - 10:48 pmIAD Washington, D.C. Dulles Intl-ONT Ontario

8h 10m1 stop San Francisco

$609United Airlines

Wed, Nov 4 - Wed, Nov 25

1:29 pm - 11:15 pmONT Ontario-IAD Washington, D.C. Dulles Intl

6h 46m1 stop Denver Intl

5:38 pm - 10:48 pmIAD Washington, D.C. Dulles Intl-ONT Ontario

8h 10m1 stop San Francisco

$609United Airlines

Sat, Nov 7 - Wed, Nov 25

12:42 pm - 11:30 pmONT Ontario-IAD Washington, D.C. Dulles Intl

7h 48m1 stop Dallas/Fort Worth

7:18 am - 11:52 amIAD Washington, D.C. Dulles Intl-ONT Ontario

7h 34m1 stop Dallas/Fort Worth

$632American Airlines

Fri, Nov 6 - Sat, Nov 7

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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

Nov 25

ONT10:55 amOntario

15h 15m

1 stop

IAD5:10 amWashington, D.C. Dulles Intl

Dec 1

IAD6:40 amWashington, D.C. Dulles Intl

29h 48m

2 stops

ONT9:28 amOntario

$221

Frontier

Nov 23

ONT10:55 amOntario

15h 15m

1 stop

IAD5:10 amWashington, D.C. Dulles Intl

Dec 1

IAD10:33 pmWashington, D.C. Dulles Intl

13h 55m

2 stops

ONT9:28 amOntario

$227

Frontier

Nov 23

ONT2:01 pmOntario

12h 09m

1 stop

IAD5:10 amWashington, D.C. Dulles Intl

Dec 2

IAD10:33 pmWashington, D.C. Dulles Intl

13h 55m

2 stops

ONT9:28 amOntario

$228

Delta flights from Ontario to District of Columbia

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

Delta

Nov 17

ONT1:15 pmOntario

7h 32m

1 stop

IAD11:47 pmWashington, D.C. Dulles Intl

Dec 3

IAD6:00 amWashington, D.C. Dulles Intl

8h 07m

1 stop

ONT11:07 amOntario

$426

Delta

Nov 14

ONT12:18 pmOntario

9h 23m

1 stop

IAD12:41 amWashington, D.C. Dulles Intl

Nov 18

IAD7:00 amWashington, D.C. Dulles Intl

8h 17m

1 stop

ONT12:17 pmOntario

$453

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 11/25

10:55 am-5:10 am

1 stop15h 15m

Washington, D.C. Dulles Intl

Tue 12/1

6:40 am-9:28 am

2 stops29h 48m

$221

OntarioWashington, D.C.

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

ONTIAD

Ontario

Mon 11/23

10:55 am-5:10 am

1 stop15h 15m

Washington, D.C. Dulles Intl

Tue 12/1

10:33 pm-9:28 am

2 stops13h 55m

$227

OntarioWashington, D.C.

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

ONTDCA

Ontario

Tue 12/8

11:30 am-9:59 pm

1 stop7h 29m

Washington, D.C. Reagan-National

Sat 12/12

5:20 pm-11:54 pm

1 stop9h 34m

$312

OntarioWashington, D.C.

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

ONTIAD

Ontario

Thu 11/26

7:00 am-5:24 pm

1 stop7h 24m

Washington, D.C. Dulles Intl

Thu 12/3

2:35 pm-8:38 pm

1 stop9h 03m

$331

OntarioWashington, D.C.

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

ONTIAD

Ontario

Thu 12/10

5:01 pm-5:35 am

1 stop9h 34m

Washington, D.C. Dulles Intl

Tue 12/15

7:00 am-4:05 pm

1 stop12h 05m

$331

OntarioWashington, D.C.

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

ONTDCA

Ontario

Thu 11/26

5:50 am-4:05 pm

1 stop7h 15m

Washington, D.C. Reagan-National

Thu 12/3

6:10 am-10:45 am

1 stop7h 35m

$341

Quickest round-trip

OntarioWashington, D.C.

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

ONTDCA

Ontario

Tue 2/2

6:30 am-4:30 pm

1 stop7h 00m

Washington, D.C. Reagan-National

Fri 2/5

7:25 pm-11:50 pm

1 stop7h 25m

$351

OntarioWashington, D.C.

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

ONTDCA

Ontario

Thu 1/28

12:45 pm-11:59 pm

1 stop8h 14m

Washington, D.C. Reagan-National

Tue 2/2

3:30 pm-11:13 pm

1 stop10h 43m

$351

OntarioWashington, D.C.

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

ONTDCA

Ontario

Tue 12/8

1:02 pm-10:46 pm

1 stop6h 44m

Washington, D.C. Reagan-National

Sat 12/12

4:59 pm-10:58 pm

1 stop8h 59m

$351

OntarioWashington, D.C.

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

ONTIAD

Ontario

Mon 2/1

6:37 pm-5:25 am

1 stop7h 48m

Washington, D.C. Dulles Intl

Fri 2/5

2:39 pm-10:15 pm

1 stop10h 36m

$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, 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 $360. 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 $369.

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 45% 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	$105
Fastest flight time	6h 32m
Direct flights	None

The best one-way flight to District of Columbia from Ontario in the past 72 hours is $105. The best round-trip flight deal from Ontario to District of Columbia found on momondo in the last 72 hours is $221.

The fastest flight from Ontario to District of Columbia takes 6h 32m

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 November 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 5.5 2,513 reviews	Search Frontier flights
Delta	PriceFrom $208	Free Cancellation	Rating 7.8 8,696 reviews	Search Delta flights
United Airlines	PriceFrom $272	Free Cancellation	Rating 7.3 10,460 reviews	Search United Airlines flights
American Airlines	PriceFrom $318	Free Cancellation	Rating 7.0 12,230 reviews	Search American Airlines flights
Southwest	PriceFrom $340	Free Cancellation	Rating 8.0 4,215 reviews	Search Southwest flights
JetBlue	PriceFrom $361	Free Cancellation	Rating 7.1 3,065 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.