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

Frontier is the most popular carrier 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.

$65 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.

10:35 am - 11:36 amONT Ontario-IAD Washington, D.C. Dulles Intl

22h 01m2 stops Las Vegas Harry Reid Intl Dallas/Fort Worth

1:09 pm - 7:20 amIAD Washington, D.C. Dulles Intl-ONT Ontario

21h 11m1 stop Las Vegas Harry Reid Intl

$161Frontier

Tue, Nov 17 - Sun, Nov 22

2:00 pm - 8:10 pmONT Ontario-IAD Washington, D.C. Dulles Intl

27h 10m2 stops Las Vegas Harry Reid Intl Dallas/Fort Worth

10:35 pm - 10:45 amIAD Washington, D.C. Dulles Intl-ONT Ontario

15h 10m2 stops Atlanta Hartsfield-Jackson Denver Intl

$165Frontier

Fri, Dec 4 - Mon, Dec 7

4:09 pm - 5:44 amONT Ontario-IAD Washington, D.C. Dulles Intl

10h 35m1 stop Seattle/Tacoma Intl

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

9h 37m1 stop Dallas/Fort Worth

$287Multiple Airlines

Wed, Nov 18 - Thu, Nov 19

4:09 pm - 5:44 amONT Ontario-IAD Washington, D.C. Dulles Intl

10h 35m1 stop Seattle/Tacoma Intl

1:09 pm - 7:36 pmIAD Washington, D.C. Dulles Intl-ONT Ontario

9h 27m1 stop Las Vegas Harry Reid Intl

$318Multiple Airlines

Wed, Nov 18 - Mon, Nov 23

12:45 pm - 10:46 pmONT Ontario-DCA Washington, D.C. Reagan-National

7h 01m1 stop Dallas/Fort Worth

8:20 am - 1:24 pmDCA Washington, D.C. Reagan-National-ONT Ontario

8h 04m1 stop Dallas/Fort Worth

$331American Airlines

Wed, Nov 25 - Wed, Dec 2

7:00 am - 6:14 pmONT Ontario-IAD Washington, D.C. Dulles Intl

8h 14m1 stop Dallas/Fort Worth

7:18 am - 1:24 pmIAD Washington, D.C. Dulles Intl-ONT Ontario

9h 06m1 stop Dallas/Fort Worth

$331American Airlines

Thu, Dec 10 - Tue, Dec 15

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

7h 08m1 stop San Francisco

8:15 am - 3:35 pmIAD Washington, D.C. Dulles Intl-ONT Ontario

10h 20m1 stop San Francisco

$331United Airlines

Wed, Dec 9 - Wed, Dec 16

1:40 pm - 11:15 pmONT Ontario-IAD Washington, D.C. Dulles Intl

6h 35m1 stop Denver Intl

2:10 pm - 9:11 pmIAD Washington, D.C. Dulles Intl-ONT Ontario

10h 01m1 stop Denver Intl

$331United Airlines

Wed, Dec 9 - Wed, Dec 16

12:20 pm - 11:42 pmONT Ontario-DCA Washington, D.C. Reagan-National

8h 22m1 stop Atlanta Hartsfield-Jackson

2:00 pm - 8:58 pmDCA Washington, D.C. Reagan-National-ONT Ontario

9h 58m1 stop Atlanta Hartsfield-Jackson

$331Delta

Thu, Dec 3 - Tue, Dec 15

11:10 pm - 9:14 amONT Ontario-DCA Washington, D.C. Reagan-National

7h 04m1 stop Atlanta Hartsfield-Jackson

6:00 am - 11:03 amDCA Washington, D.C. Reagan-National-ONT Ontario

8h 03m1 stop Atlanta Hartsfield-Jackson

$331Delta

Mon, Nov 16 - Wed, Nov 18

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

23h 51m1 stop Denver Intl

$333Frontier

Tue, Nov 3 - Sat, Nov 21

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

$361Frontier

Wed, Nov 4 - Tue, Nov 10

4:09 pm - 5:44 amONT Ontario-IAD Washington, D.C. Dulles Intl

10h 35m1 stop Seattle/Tacoma Intl

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

9h 37m1 stop Dallas/Fort Worth

$420Multiple Airlines

Tue, Nov 3 - Thu, Nov 19

4:09 pm - 5:44 amONT Ontario-IAD Washington, D.C. Dulles Intl

10h 35m1 stop Seattle/Tacoma Intl

1:09 pm - 7:36 pmIAD Washington, D.C. Dulles Intl-ONT Ontario

9h 27m1 stop Las Vegas Harry Reid Intl

$441Multiple Airlines

Tue, Nov 3 - Sun, Nov 22

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

7h 03m1 stop Atlanta Hartsfield-Jackson

6:00 am - 11:03 amIAD Washington, D.C. Dulles Intl-ONT Ontario

8h 03m1 stop Atlanta Hartsfield-Jackson

$530Delta

Tue, Nov 3 - Tue, Nov 10

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

9h 26m1 stop Atlanta Hartsfield-Jackson

6:00 am - 11:03 amIAD Washington, D.C. Dulles Intl-ONT Ontario

8h 03m1 stop Atlanta Hartsfield-Jackson

$530Delta

Wed, Nov 4 - Tue, Nov 10

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

7h 24m1 stop Chicago O'Hare Intl

2:24 pm - 9:59 pmIAD Washington, D.C. Dulles Intl-ONT Ontario

10h 35m1 stop Houston George Bush Intcntl

$619United Airlines

Tue, Nov 3 - Wed, Dec 2

8:45 pm - 8:20 amONT Ontario-DCA Washington, D.C. Reagan-National

8h 35m2 stops Las Vegas Harry Reid Intl Nashville Intl

6:10 am - 12:10 pmDCA Washington, D.C. Reagan-National-ONT Ontario

9h 00m2 stops Dallas Love Field Phoenix Sky Harbor Intl

$629Southwest

Sun, Nov 1 - Tue, Nov 10

9:25 am - 9:57 pmONT Ontario-IAD Washington, D.C. Dulles Intl

9h 32m1 stop San Francisco

2:26 pm - 8:15 pmIAD Washington, D.C. Dulles Intl-ONT Ontario

8h 49m1 stop San Francisco

$660United Airlines

Wed, Nov 4 - Wed, Nov 11

8:40 am - 8:15 pmONT Ontario-DCA Washington, D.C. Reagan-National

8h 35m2 stops Phoenix Sky Harbor Intl Dallas Love Field

1:35 pm - 9:45 pmDCA Washington, D.C. Reagan-National-ONT Ontario

11h 10m2 stops Dallas Love Field Oakland

$706Southwest

Wed, Nov 4 - Thu, Nov 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

Nov 17

ONT10:35 amOntario

22h 01m

2 stops

IAD11:36 amWashington, D.C. Dulles Intl

Nov 22

IAD1:09 pmWashington, D.C. Dulles Intl

21h 11m

1 stop

ONT7:20 amOntario

$161

Frontier

Dec 4

ONT2:00 pmOntario

27h 10m

2 stops

IAD8:10 pmWashington, D.C. Dulles Intl

Dec 7

IAD10:35 pmWashington, D.C. Dulles Intl

15h 10m

2 stops

ONT10:45 amOntario

$165

Frontier

Nov 16

ONT8:35 pmOntario

12h 01m

2 stops

IAD11:36 amWashington, D.C. Dulles Intl

Nov 22

IAD1:09 pmWashington, D.C. Dulles Intl

21h 11m

1 stop

ONT7:20 amOntario

$168

Delta flights from Ontario to District of Columbia

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

Delta

Nov 10

ONT1:15 pmOntario

7h 32m

1 stop

IAD11:47 pmWashington, D.C. Dulles Intl

Nov 17

IAD7:00 amWashington, D.C. Dulles Intl

8h 17m

1 stop

ONT12:17 pmOntario

$392

Delta

Nov 10

ONT1:15 pmOntario

7h 32m

1 stop

IAD11:47 pmWashington, D.C. Dulles Intl

Jan 9

IAD7:05 amWashington, D.C. Dulles Intl

8h 07m

1 stop

ONT12:12 pmOntario

$412

Delta

Nov 10

ONT1:15 pmOntario

7h 32m

1 stop

IAD11:47 pmWashington, D.C. Dulles Intl

Jan 8

IAD6:00 amWashington, D.C. Dulles Intl

8h 55m

1 stop

ONT11:55 amOntario

$427

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 11/17

10:35 am-11:36 am

2 stops22h 01m

Washington, D.C. Dulles Intl

Sun 11/22

1:09 pm-7:20 am

1 stop21h 11m

$161

OntarioWashington, D.C.

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

ONTIAD

Ontario

Fri 12/4

2:00 pm-8:10 pm

2 stops27h 10m

Washington, D.C. Dulles Intl

Mon 12/7

10:35 pm-10:45 am

2 stops15h 10m

$165

OntarioWashington, D.C.

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

ONTIAD

Ontario

Wed 11/18

4:09 pm-5:44 am

1 stop10h 35m

Washington, D.C. Dulles Intl

Thu 11/19

12:31 pm-7:08 pm

1 stop9h 37m

$287

OntarioWashington, D.C.

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

ONTIAD

Ontario

Wed 11/18

4:09 pm-5:44 am

1 stop10h 35m

Washington, D.C. Dulles Intl

Mon 11/23

1:09 pm-7:36 pm

1 stop9h 27m

$318

Quickest round-trip

OntarioWashington, D.C.

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

ONTDCA

Ontario

Wed 11/25

12:45 pm-10:46 pm

1 stop7h 01m

Washington, D.C. Reagan-National

Wed 12/2

8:20 am-1:24 pm

1 stop8h 04m

$331

OntarioWashington, D.C.

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

ONTIAD

Ontario

Thu 12/10

7:00 am-6:14 pm

1 stop8h 14m

Washington, D.C. Dulles Intl

Tue 12/15

7:18 am-1:24 pm

1 stop9h 06m

$331

OntarioWashington, D.C.

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

ONTIAD

Ontario

Wed 12/9

6:00 am-4:08 pm

1 stop7h 08m

Washington, D.C. Dulles Intl

Wed 12/16

8:15 am-3:35 pm

1 stop10h 20m

$331

OntarioWashington, D.C.

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

ONTIAD

Ontario

Wed 12/9

1:40 pm-11:15 pm

1 stop6h 35m

Washington, D.C. Dulles Intl

Wed 12/16

2:10 pm-9:11 pm

1 stop10h 01m

$331

OntarioWashington, D.C.

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

ONTDCA

Ontario

Thu 12/3

12:20 pm-11:42 pm

1 stop8h 22m

Washington, D.C. Reagan-National

Tue 12/15

2:00 pm-8:58 pm

1 stop9h 58m

$331

OntarioWashington, D.C.

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

ONTDCA

Ontario

Mon 11/16

11:10 pm-9:14 am

1 stop7h 04m

Washington, D.C. Reagan-National

Wed 11/18

6:00 am-11:03 am

1 stop8h 03m

$331

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	$65
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 $65. The best round-trip flight deal from Ontario to District of Columbia found on momondo in the last 72 hours is $161.

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 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 5.5 2,515 reviews	Search Frontier flights
Delta	PriceFrom $208	Free Cancellation	Rating 7.8 8,687 reviews	Search Delta flights
United Airlines	PriceFrom $272	Free Cancellation	Rating 7.3 10,444 reviews	Search United Airlines flights
American Airlines	PriceFrom $318	Free Cancellation	Rating 7.0 12,204 reviews	Search American Airlines flights
Southwest	PriceFrom $346	Free Cancellation	Rating 7.9 4,221 reviews	Search Southwest flights
JetBlue	PriceFrom $361	Free Cancellation	Rating 7.1 3,076 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.