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

United Airlines, Alaska Airlines, and Southwest are the most popular carriers operating from Ontario to District of Columbia

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 46% of people opting to fly with this airline when traveling to District of Columbia. Keep in mind that there are 9 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 May 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.

$115 Cheap Flights from Ontario to District of Columbia in 2026

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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.

12:00 pm - 10:44 pm

ONT

DCA

7h 44m

1 stop

5:54 pm - 10:23 pm

DCA

ONT

7h 29m

1 stop

$257Delta

Wed, Aug 26 - Tue, Sep 1

3:40 pm - 8:20 am

ONT

IAD

13h 40m

1 stop

9:57 pm - 8:37 am

IAD

ONT

13h 40m

1 stop

$257Frontier

Wed, Jul 8 - Sat, Jul 18

12:00 pm - 10:44 pm

ONT

DCA

7h 44m

1 stop

5:54 pm - 10:23 pm

DCA

ONT

7h 29m

1 stop

$259Delta

Thu, Aug 27 - Tue, Sep 1

10:00 pm - 9:20 am

ONT

IAD

8h 20m

1 stop

7:00 am - 12:05 pm

IAD

ONT

8h 05m

1 stop

$259Delta

Mon, Aug 24 - Tue, Sep 1

11:59 pm - 12:43 pm

ONT

DCA

9h 44m

1 stop

5:00 am - 9:34 am

DCA

ONT

7h 34m

1 stop

$261American Airlines

Mon, Aug 24 - Mon, Aug 31

3:40 pm - 8:20 am

ONT

IAD

13h 40m

1 stop

9:57 pm - 8:37 am

IAD

ONT

13h 40m

1 stop

$262Frontier

Sat, Jul 11 - Sat, Jul 18

8:17 am - 9:12 pm

ONT

IAD

9h 55m

1 stop

9:50 am - 3:54 pm

IAD

ONT

9h 04m

1 stop

$272Frontier

Sat, Jul 25 - Fri, Jul 31

3:40 pm - 8:20 am

ONT

IAD

13h 40m

1 stop

9:57 pm - 8:37 am

IAD

ONT

13h 40m

1 stop

$274Frontier

Sat, Jul 11 - Sat, Jul 18

1:18 pm - 12:32 am

ONT

IAD

8h 14m

1 stop

5:48 pm - 10:59 pm

IAD

ONT

8h 11m

1 stop

$275United Airlines

Mon, Aug 24 - Mon, Aug 31

3:40 pm - 8:20 am

ONT

IAD

13h 40m

1 stop

9:57 pm - 8:37 am

IAD

ONT

13h 40m

1 stop

$277Frontier

Tue, Jul 7 - Sat, Jul 18

United Airlines flights from Ontario to District of Columbia

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

United Airlines

Aug 24

ONT1:18 pmOntario

8h 14m

1 stop

IAD12:32 amWashington, D.C. Dulles Intl

Aug 31

IAD5:48 pmWashington, D.C. Dulles Intl

8h 11m

1 stop

ONT10:59 pmOntario

$275

United Airlines

Aug 6

ONT5:45 amOntario

7h 18m

1 stop

DCA4:03 pmWashington, D.C. Reagan-National

Aug 10

DCA5:05 pmWashington, D.C. Reagan-National

8h 46m

1 stop

ONT10:51 pmOntario

$343

United Airlines

Aug 6

ONT6:10 amOntario

8h 02m

1 stop

DCA5:12 pmWashington, D.C. Reagan-National

Aug 10

DCA5:05 pmWashington, D.C. Reagan-National

8h 46m

1 stop

ONT10:51 pmOntario

$348

Frontier flights from Ontario to District of Columbia

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

Frontier

Jul 8

ONT3:40 pmOntario

13h 40m

1 stop

IAD8:20 amWashington, D.C. Dulles Intl

Jul 18

IAD9:57 pmWashington, D.C. Dulles Intl

13h 40m

1 stop

ONT8:37 amOntario

$257

Frontier

Jul 11

ONT3:40 pmOntario

13h 40m

1 stop

IAD8:20 amWashington, D.C. Dulles Intl

Jul 18

IAD9:57 pmWashington, D.C. Dulles Intl

13h 40m

1 stop

ONT8:37 amOntario

$262

Frontier

Jul 25

ONT8:17 amOntario

9h 55m

1 stop

IAD9:12 pmWashington, D.C. Dulles Intl

Jul 31

IAD9:50 amWashington, D.C. Dulles Intl

9h 04m

1 stop

ONT3:54 pmOntario

$272

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

Quickest round-trip

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Wed 8/26

12:00 pm-10:44 pm

1 stop7h 44m

Washington, D.C. Reagan-National

Tue 9/1

5:54 pm-10:23 pm

1 stop7h 29m

$257

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Wed 7/8

3:40 pm-8:20 am

1 stop13h 40m

Washington, D.C. Dulles Intl

Sat 7/18

9:57 pm-8:37 am

1 stop13h 40m

$257

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Thu 8/27

12:00 pm-10:44 pm

1 stop7h 44m

Washington, D.C. Reagan-National

Tue 9/1

5:54 pm-10:23 pm

1 stop7h 29m

$259

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Mon 8/24

10:00 pm-9:20 am

1 stop8h 20m

Washington, D.C. Dulles Intl

Tue 9/1

7:00 am-12:05 pm

1 stop8h 05m

$259

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Mon 8/24

11:59 pm-12:43 pm

1 stop9h 44m

Washington, D.C. Reagan-National

Mon 8/31

5:00 am-9:34 am

1 stop7h 34m

$261

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Sat 7/11

3:40 pm-8:20 am

1 stop13h 40m

Washington, D.C. Dulles Intl

Sat 7/18

9:57 pm-8:37 am

1 stop13h 40m

$262

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Sat 7/25

8:17 am-9:12 pm

1 stop9h 55m

Washington, D.C. Dulles Intl

Fri 7/31

9:50 am-3:54 pm

1 stop9h 04m

$272

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Sat 7/11

3:40 pm-8:20 am

1 stop13h 40m

Washington, D.C. Dulles Intl

Sat 7/18

9:57 pm-8:37 am

1 stop13h 40m

$274

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Mon 8/24

1:18 pm-12:32 am

1 stop8h 14m

Washington, D.C. Dulles Intl

Mon 8/31

5:48 pm-10:59 pm

1 stop8h 11m

$275

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Tue 7/7

3:40 pm-8:20 am

1 stop13h 40m

Washington, D.C. Dulles Intl

Sat 7/18

9:57 pm-8:37 am

1 stop13h 40m

$277

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 19% 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 42m
Direct flights	None

The fastest flight from Ontario to District of Columbia takes 6h 42m

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 May 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
Delta	PriceFrom $128	Free Cancellation	Rating 7.9 8,416 reviews	Search Delta flights
Frontier	PriceFrom $141	Free Cancellation	Rating 5.6 2,929 reviews	Search Frontier flights
United Airlines	PriceFrom $226	Free Cancellation	Rating 7.4 9,766 reviews	Search United Airlines flights
American Airlines	PriceFrom $256	Free Cancellation	Rating 7.1 11,640 reviews	Search American Airlines flights
Southwest	PriceFrom $258	Free Cancellation	Rating 8.0 4,262 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.