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

Delta, 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, 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 47% 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.

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 July 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.

$116 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.

6:00 am - 10:52 pm

ONT

IAD

13h 52m

2 stops

8:59 am - 4:22 pm

IAD

ONT

10h 23m

1 stop

$315Frontier

Thu, Aug 20 - Mon, Aug 24

6:00 am - 12:51 pm

ONT

DCA

27h 51m

1 stop

7:00 am - 11:50 pm

DCA

ONT

19h 50m

1 stop

$316Frontier

Wed, Aug 5 - Wed, Aug 12

6:00 am - 4:59 pm

ONT

DCA

7h 59m

1 stop

6:00 pm - 11:55 pm

DCA

ONT

8h 55m

1 stop

$317Frontier

Fri, Aug 14 - Thu, Oct 15

3:40 pm - 8:04 am

ONT

IAD

13h 24m

1 stop

8:39 pm - 7:01 pm

IAD

ONT

25h 22m

2 stops

$317Frontier

Wed, Sep 2 - Mon, Sep 7

6:00 am - 4:59 pm

ONT

DCA

7h 59m

1 stop

1:59 pm - 11:50 pm

DCA

ONT

12h 51m

1 stop

$318Frontier

Fri, Aug 7 - Wed, Aug 19

6:00 am - 4:59 pm

ONT

DCA

7h 59m

1 stop

7:00 am - 10:04 am

DCA

ONT

30h 04m

1 stop

$319Frontier

Mon, Aug 10 - Wed, Aug 12

10:49 am - 9:59 pm

ONT

DCA

8h 10m

1 stop

1:59 pm - 11:50 pm

DCA

ONT

12h 51m

1 stop

$320Frontier

Fri, Aug 14 - Sun, Aug 16

4:09 pm - 8:20 am

ONT

IAD

13h 11m

1 stop

7:48 am - 7:32 am

IAD

ONT

26h 44m

2 stops

$321Frontier

Tue, Aug 11 - Thu, Aug 13

10:49 am - 9:59 pm

ONT

DCA

8h 10m

1 stop

6:00 pm - 11:50 pm

DCA

ONT

8h 50m

1 stop

$322Frontier

Fri, Sep 4 - Sat, Sep 5

6:00 am - 9:59 pm

ONT

DCA

12h 59m

1 stop

6:00 pm - 2:03 pm

DCA

ONT

23h 03m

2 stops

$323Frontier

Sat, Aug 22 - Mon, Aug 24

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Delta flights from Ontario to District of Columbia

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

Delta

Aug 13

ONT7:05 amOntario

8h 23m

1 stop

IAD6:28 pmWashington, D.C. Dulles Intl

Aug 19

IAD3:03 pmWashington, D.C. Dulles Intl

7h 50m

1 stop

ONT7:53 pmOntario

$341

Delta

Aug 13

ONT7:05 amOntario

8h 23m

1 stop

IAD6:28 pmWashington, D.C. Dulles Intl

Aug 20

IAD6:00 amWashington, D.C. Dulles Intl

7h 42m

1 stop

ONT10:42 amOntario

$351

Delta

Aug 13

ONT7:05 amOntario

8h 23m

1 stop

IAD6:28 pmWashington, D.C. Dulles Intl

Aug 19

IAD3:03 pmWashington, D.C. Dulles Intl

7h 50m

1 stop

ONT7:53 pmOntario

$370

Frontier flights from Ontario to District of Columbia

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

Frontier

Aug 20

ONT6:00 amOntario

13h 52m

2 stops

IAD10:52 pmWashington, D.C. Dulles Intl

Aug 24

IAD8:59 amWashington, D.C. Dulles Intl

10h 23m

1 stop

ONT4:22 pmOntario

$315

Frontier

Aug 5

ONT6:00 amOntario

27h 51m

1 stop

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

Aug 12

DCA7:00 amWashington, D.C. Reagan-National

19h 50m

1 stop

ONT11:50 pmOntario

$316

Frontier

Sep 2

ONT3:40 pmOntario

13h 24m

1 stop

IAD8:04 amWashington, D.C. Dulles Intl

Sep 7

IAD8:39 pmWashington, D.C. Dulles Intl

25h 22m

2 stops

ONT7:01 pmOntario

$317

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 - IAD

ONTIAD

Ontario

Thu 8/20

6:00 am-10:52 pm

2 stops13h 52m

Washington, D.C. Dulles Intl

Mon 8/24

8:59 am-4:22 pm

1 stop10h 23m

$315

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Wed 8/5

6:00 am-12:51 pm

1 stop27h 51m

Washington, D.C. Reagan-National

Wed 8/12

7:00 am-11:50 pm

1 stop19h 50m

$316

Quickest round-trip

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Fri 8/14

6:00 am-4:59 pm

1 stop7h 59m

Washington, D.C. Reagan-National

Thu 10/15

6:00 pm-11:55 pm

1 stop8h 55m

$317

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Wed 9/2

3:40 pm-8:04 am

1 stop13h 24m

Washington, D.C. Dulles Intl

Mon 9/7

8:39 pm-7:01 pm

2 stops25h 22m

$317

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Fri 8/7

6:00 am-4:59 pm

1 stop7h 59m

Washington, D.C. Reagan-National

Wed 8/19

1:59 pm-11:50 pm

1 stop12h 51m

$318

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Mon 8/10

6:00 am-4:59 pm

1 stop7h 59m

Washington, D.C. Reagan-National

Wed 8/12

7:00 am-10:04 am

1 stop30h 04m

$319

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Fri 8/14

10:49 am-9:59 pm

1 stop8h 10m

Washington, D.C. Reagan-National

Sun 8/16

1:59 pm-11:50 pm

1 stop12h 51m

$320

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Tue 8/11

4:09 pm-8:20 am

1 stop13h 11m

Washington, D.C. Dulles Intl

Thu 8/13

7:48 am-7:32 am

2 stops26h 44m

$321

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Fri 9/4

10:49 am-9:59 pm

1 stop8h 10m

Washington, D.C. Reagan-National

Sat 9/5

6:00 pm-11:50 pm

1 stop8h 50m

$322

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Sat 8/22

6:00 am-9:59 pm

1 stop12h 59m

Washington, D.C. Reagan-National

Mon 8/24

6:00 pm-2:03 pm

2 stops23h 03m

$323

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, September 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 $298. If you don’t want to visit District of Columbia in September, then you should wait until August to fly from Ontario, when ticket prices are also cheap, with an average price of $371.

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 25% 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	7h 12m
Direct flights	None

The fastest flight from Ontario to District of Columbia takes 7h 12m

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 July 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 $169	Free Cancellation	Rating 5.6 2,770 reviews	Search Frontier flights
Delta	PriceFrom $172	Free Cancellation	Rating 7.8 8,476 reviews	Search Delta flights
United Airlines	PriceFrom $226	Free Cancellation	Rating 7.4 10,020 reviews	Search United Airlines flights
Southwest	PriceFrom $268	Free Cancellation	Rating 8.0 4,241 reviews	Search Southwest flights
American Airlines	PriceFrom $278	Free Cancellation	Rating 7.1 11,834 reviews	Search American Airlines 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.