What airlines fly to District of Columbia?

United Airlines, Southwest and American Airlines 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 45% 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?

United Airlines, Alaska Airlines, and Delta 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 June 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

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.

10:50 am - 4:57 pm

ONT

DCA

27h 07m

1 stop

7:00 am - 10:05 am

DCA

ONT

30h 05m

1 stop

$252Frontier

Wed, Aug 19 - Sat, Aug 22

3:34 pm - 8:25 am

ONT

IAD

13h 51m

1 stop

9:35 am - 7:51 pm

IAD

ONT

13h 16m

1 stop

$252Frontier

Wed, Jul 1 - Sat, Jul 4

6:00 am - 12:51 pm

ONT

DCA

27h 51m

1 stop

6:00 pm - 10:04 am

DCA

ONT

19h 04m

1 stop

$254Frontier

Tue, Aug 4 - Fri, Aug 7

6:00 am - 12:51 pm

ONT

DCA

27h 51m

1 stop

6:00 pm - 11:49 pm

DCA

ONT

8h 49m

1 stop

$255Frontier

Wed, Aug 12 - Mon, Aug 31

6:00 am - 12:51 pm

ONT

DCA

27h 51m

1 stop

7:00 am - 10:04 am

DCA

ONT

30h 04m

1 stop

$257Frontier

Wed, Aug 5 - Sun, Aug 9

8:25 am - 8:55 pm

ONT

DCA

9h 30m

2 stops

12:55 pm - 6:55 pm

DCA

ONT

9h 00m

1 stop

$260Southwest

Tue, Sep 22 - Wed, Sep 30

7:00 am - 5:37 pm

ONT

IAD

7h 37m

1 stop

1:10 pm - 7:57 pm

IAD

ONT

9h 47m

1 stop

$270United Airlines

Wed, Sep 9 - Wed, Sep 23

12:00 pm - 12:10 am

ONT

IAD

9h 10m

1 stop

7:00 am - 12:10 pm

IAD

ONT

8h 10m

1 stop

$280Delta

Wed, Sep 9 - Tue, Sep 22

6:00 am - 4:21 pm

ONT

DCA

7h 21m

1 stop

5:40 pm - 9:54 pm

DCA

ONT

7h 14m

1 stop

$282Delta

Sat, Sep 12 - Sat, Sep 19

3:40 pm - 8:20 am

ONT

IAD

13h 40m

1 stop

6:03 am - 1:09 pm

IAD

ONT

10h 06m

1 stop

$292Multiple Airlines

Wed, Jul 29 - Wed, Aug 12

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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

Jul 1

ONT3:34 pmOntario

13h 51m

1 stop

IAD8:25 amWashington, D.C. Dulles Intl

Jul 4

IAD9:35 amWashington, D.C. Dulles Intl

13h 16m

1 stop

ONT7:51 pmOntario

$252

Frontier

Aug 4

ONT6:00 amOntario

27h 51m

1 stop

DCA12:51 pmWashington, D.C. Reagan-National

Aug 7

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

19h 04m

1 stop

ONT10:04 amOntario

$254

Frontier

Aug 12

ONT6:00 amOntario

27h 51m

1 stop

DCA12:51 pmWashington, D.C. Reagan-National

Aug 31

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

8h 49m

1 stop

ONT11:49 pmOntario

$255

United Airlines flights from Ontario to District of Columbia

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

United Airlines

Sep 9

ONT7:00 amOntario

7h 37m

1 stop

IAD5:37 pmWashington, D.C. Dulles Intl

Sep 23

IAD1:10 pmWashington, D.C. Dulles Intl

9h 47m

1 stop

ONT7:57 pmOntario

$270

United Airlines

Nov 6

ONT7:00 amOntario

6h 52m

1 stop

DCA4:52 pmWashington, D.C. Reagan-National

Nov 9

DCA5:00 pmWashington, D.C. Reagan-National

8h 26m

1 stop

ONT10:26 pmOntario

$316

United Airlines

Sep 12

ONT7:00 amOntario

7h 37m

1 stop

IAD5:37 pmWashington, D.C. Dulles Intl

Sep 27

IAD6:35 amWashington, D.C. Dulles Intl

8h 43m

1 stop

ONT12:18 pmOntario

$326

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 - DCA

ONTDCA

Ontario

Wed 8/19

10:50 am-4:57 pm

1 stop27h 07m

Washington, D.C. Reagan-National

Sat 8/22

7:00 am-10:05 am

1 stop30h 05m

$252

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Wed 7/1

3:34 pm-8:25 am

1 stop13h 51m

Washington, D.C. Dulles Intl

Sat 7/4

9:35 am-7:51 pm

1 stop13h 16m

$252

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Tue 8/4

6:00 am-12:51 pm

1 stop27h 51m

Washington, D.C. Reagan-National

Fri 8/7

6:00 pm-10:04 am

1 stop19h 04m

$254

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Wed 8/12

6:00 am-12:51 pm

1 stop27h 51m

Washington, D.C. Reagan-National

Mon 8/31

6:00 pm-11:49 pm

1 stop8h 49m

$255

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Wed 8/5

6:00 am-12:51 pm

1 stop27h 51m

Washington, D.C. Reagan-National

Sun 8/9

7:00 am-10:04 am

1 stop30h 04m

$257

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Tue 9/22

8:25 am-8:55 pm

2 stops9h 30m

Washington, D.C. Reagan-National

Wed 9/30

12:55 pm-6:55 pm

1 stop9h 00m

$260

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Wed 9/9

7:00 am-5:37 pm

1 stop7h 37m

Washington, D.C. Dulles Intl

Wed 9/23

1:10 pm-7:57 pm

1 stop9h 47m

$270

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Wed 9/9

12:00 pm-12:10 am

1 stop9h 10m

Washington, D.C. Dulles Intl

Tue 9/22

7:00 am-12:10 pm

1 stop8h 10m

$280

Quickest round-trip

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Sat 9/12

6:00 am-4:21 pm

1 stop7h 21m

Washington, D.C. Reagan-National

Sat 9/19

5:40 pm-9:54 pm

1 stop7h 14m

$282

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Wed 7/29

3:40 pm-8:20 am

1 stop13h 40m

Washington, D.C. Dulles Intl

Wed 8/12

6:03 am-1:09 pm

1 stop10h 06m

$292

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, July 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 $68. If you don’t want to visit District of Columbia in July, then you should wait until November to fly from Ontario, when ticket prices are also cheap, with an average price of $97.

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 14% 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

Fastest flight time	6h 36m
Direct flights	None

The fastest flight from Ontario to District of Columbia takes 6h 36m

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 June 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 $166	Free Cancellation	Rating 5.6 2,898 reviews	Search Frontier flights
Delta	PriceFrom $172	Free Cancellation	Rating 7.9 8,396 reviews	Search Delta flights
United Airlines	PriceFrom $226	Free Cancellation	Rating 7.4 9,804 reviews	Search United Airlines flights
American Airlines	PriceFrom $256	Free Cancellation	Rating 7.1 11,635 reviews	Search American Airlines flights
Southwest	PriceFrom $258	Free Cancellation	Rating 7.9 4,235 reviews	Search Southwest 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.