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

Frontier, Delta, and Alaska Airlines 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 April 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.

$79 Cheap Flights from Ontario to District of Columbia in 2026

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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.

4:39 pm - 8:12 am

ONT

IAD

12h 33m

1 stop

9:12 am - 3:44 pm

IAD

ONT

9h 32m

1 stop

$160Frontier

Wed, May 20 - Tue, May 26

12:59 am - 12:59 pm

ONT

DCA

9h 00m

1 stop

1:59 pm - 10:05 am

DCA

ONT

23h 06m

1 stop

$180Frontier

Sat, May 2 - Thu, May 7

6:00 am - 12:59 pm

ONT

DCA

27h 59m

1 stop

7:00 am - 10:05 am

DCA

ONT

30h 05m

1 stop

$185Frontier

Sat, May 23 - Wed, May 27

11:51 am - 8:12 am

ONT

IAD

17h 21m

1 stop

9:12 am - 8:04 am

IAD

ONT

25h 52m

1 stop

$185Frontier

Thu, May 21 - Mon, May 25

6:00 am - 12:59 pm

ONT

DCA

27h 59m

1 stop

7:00 am - 10:05 am

DCA

ONT

30h 05m

1 stop

$190Frontier

Sat, May 23 - Fri, May 29

3:30 pm - 8:12 am

ONT

IAD

13h 42m

1 stop

9:12 am - 3:09 pm

IAD

ONT

8h 57m

1 stop

$190Frontier

Sat, May 23 - Fri, May 29

12:59 am - 12:59 pm

ONT

DCA

9h 00m

1 stop

6:00 pm - 10:05 am

DCA

ONT

19h 05m

1 stop

$191Frontier

Fri, May 1 - Sat, May 9

4:39 pm - 8:12 am

ONT

IAD

12h 33m

1 stop

9:12 am - 3:44 pm

IAD

ONT

9h 32m

1 stop

$192Frontier

Wed, May 20 - Wed, May 27

3:30 pm - 8:12 am

ONT

IAD

13h 42m

1 stop

9:12 am - 3:09 pm

IAD

ONT

8h 57m

1 stop

$196Frontier

Sat, May 23 - Fri, May 29

11:51 am - 8:12 am

ONT

IAD

17h 21m

1 stop

9:12 am - 8:04 am

IAD

ONT

25h 52m

1 stop

$198Frontier

Thu, May 21 - Mon, May 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

May 20

ONT4:39 pmOntario

12h 33m

1 stop

IAD8:12 amWashington, D.C. Dulles Intl

May 26

IAD9:12 amWashington, D.C. Dulles Intl

9h 32m

1 stop

ONT3:44 pmOntario

$160

Frontier

May 2

ONT12:59 amOntario

9h 00m

1 stop

DCA12:59 pmWashington, D.C. Reagan-National

May 7

DCA1:59 pmWashington, D.C. Reagan-National

23h 06m

1 stop

ONT10:05 amOntario

$180

Frontier

May 21

ONT11:51 amOntario

17h 21m

1 stop

IAD8:12 amWashington, D.C. Dulles Intl

May 25

IAD9:12 amWashington, D.C. Dulles Intl

25h 52m

1 stop

ONT8:04 amOntario

$185

United Airlines flights from Ontario to District of Columbia

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

United Airlines

May 4

ONT1:40 pmOntario

6h 54m

1 stop

IAD11:34 pmWashington, D.C. Dulles Intl

May 9

IAD1:10 pmWashington, D.C. Dulles Intl

7h 51m

1 stop

ONT6:01 pmOntario

$595

United Airlines

May 1

ONT7:00 amOntario

9h 28m

1 stop

IAD7:28 pmWashington, D.C. Dulles Intl

May 8

IAD6:30 amWashington, D.C. Dulles Intl

8h 52m

1 stop

ONT12:22 pmOntario

$615

United Airlines

May 4

ONT7:00 amOntario

9h 28m

1 stop

IAD7:28 pmWashington, D.C. Dulles Intl

May 10

IAD4:10 pmWashington, D.C. Dulles Intl

9h 49m

1 stop

ONT10:59 pmOntario

$630

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 - IAD

ONTIAD

Ontario

Wed 5/20

4:39 pm-8:12 am

1 stop12h 33m

Washington, D.C. Dulles Intl

Tue 5/26

9:12 am-3:44 pm

1 stop9h 32m

$160

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Sat 5/2

12:59 am-12:59 pm

1 stop9h 00m

Washington, D.C. Reagan-National

Thu 5/7

1:59 pm-10:05 am

1 stop23h 06m

$180

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Sat 5/23

6:00 am-12:59 pm

1 stop27h 59m

Washington, D.C. Reagan-National

Wed 5/27

7:00 am-10:05 am

1 stop30h 05m

$185

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Thu 5/21

11:51 am-8:12 am

1 stop17h 21m

Washington, D.C. Dulles Intl

Mon 5/25

9:12 am-8:04 am

1 stop25h 52m

$185

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Sat 5/23

6:00 am-12:59 pm

1 stop27h 59m

Washington, D.C. Reagan-National

Fri 5/29

7:00 am-10:05 am

1 stop30h 05m

$190

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Sat 5/23

3:30 pm-8:12 am

1 stop13h 42m

Washington, D.C. Dulles Intl

Fri 5/29

9:12 am-3:09 pm

1 stop8h 57m

$190

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Fri 5/1

12:59 am-12:59 pm

1 stop9h 00m

Washington, D.C. Reagan-National

Sat 5/9

6:00 pm-10:05 am

1 stop19h 05m

$191

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Wed 5/20

4:39 pm-8:12 am

1 stop12h 33m

Washington, D.C. Dulles Intl

Wed 5/27

9:12 am-3:44 pm

1 stop9h 32m

$192

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Sat 5/23

3:30 pm-8:12 am

1 stop13h 42m

Washington, D.C. Dulles Intl

Fri 5/29

9:12 am-3:09 pm

1 stop8h 57m

$196

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Thu 5/21

11:51 am-8:12 am

1 stop17h 21m

Washington, D.C. Dulles Intl

Mon 5/25

9:12 am-8:04 am

1 stop25h 52m

$198

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, May 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 $221. If you don’t want to visit District of Columbia in May, then you should wait until January to fly from Ontario, when ticket prices are also cheap, with an average price of $223.

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 37% 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 20m
Direct flights	None

The fastest flight from Ontario to District of Columbia takes 6h 20m

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 April 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 $136	Free Cancellation	Rating 5.6 2,983 reviews	Search Frontier flights
Delta	PriceFrom $172	Free Cancellation	Rating 7.9 8,422 reviews	Search Delta flights
United Airlines	PriceFrom $226	Free Cancellation	Rating 7.4 9,607 reviews	Search United Airlines flights
American Airlines	PriceFrom $256	Free Cancellation	Rating 7.1 11,626 reviews	Search American Airlines flights
Southwest	PriceFrom $258	Free Cancellation	Rating 8.0 4,330 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.