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 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?

Southwest, United 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 August 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.

$77 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 - 4:59 pmONT Ontario-DCA Washington, D.C. Reagan-National

7h 59m1 stop Denver Intl

6:00 pm - 11:47 pmDCA Washington, D.C. Reagan-National-ONT Ontario

8h 47m1 stop Denver Intl

$265Frontier

Tue, Aug 25 - Tue, Sep 15

11:55 pm - 11:00 amONT Ontario-DCA Washington, D.C. Reagan-National

8h 05m1 stop Chicago Midway

4:20 pm - 10:15 pmDCA Washington, D.C. Reagan-National-ONT Ontario

8h 55m2 stops Dallas Love Field Las Vegas Harry Reid Intl

$266Southwest

Fri, Oct 16 - Mon, Oct 19

6:15 am - 9:59 pmONT Ontario-DCA Washington, D.C. Reagan-National

12h 44m1 stop Denver Intl

1:06 pm - 11:47 pmDCA Washington, D.C. Reagan-National-ONT Ontario

13h 41m1 stop Denver Intl

$266Frontier

Fri, Oct 2 - Sun, Oct 4

5:20 am - 4:25 pmONT Ontario-DCA Washington, D.C. Reagan-National

8h 05m2 stops Phoenix Sky Harbor Intl Omaha Eppley Airfield

4:20 pm - 10:15 pmDCA Washington, D.C. Reagan-National-ONT Ontario

8h 55m2 stops Dallas Love Field Las Vegas Harry Reid Intl

$271Southwest

Fri, Oct 16 - Mon, Oct 19

1:24 pm - 11:35 pmONT Ontario-IAD Washington, D.C. Dulles Intl

7h 11m1 stop Salt Lake City

6:13 am - 12:21 pmIAD Washington, D.C. Dulles Intl-ONT Ontario

9h 08m1 stop Salt Lake City

$274Delta

Fri, Oct 30 - Tue, Nov 3

1:25 pm - 11:37 pmONT Ontario-IAD Washington, D.C. Dulles Intl

7h 12m1 stop Salt Lake City

5:00 pm - 9:59 pmIAD Washington, D.C. Dulles Intl-ONT Ontario

7h 59m1 stop Atlanta Hartsfield-Jackson

$274Delta

Tue, Nov 10 - Fri, Nov 13

8:24 pm - 6:20 amONT Ontario-IAD Washington, D.C. Dulles Intl

6h 56m1 stop Las Vegas Harry Reid Intl

7:00 am - 2:16 pmIAD Washington, D.C. Dulles Intl-ONT Ontario

10h 16m1 stop Seattle/Tacoma Intl

$277Multiple Airlines

Fri, Sep 18 - Tue, Sep 22

12:00 pm - 11:59 pmONT Ontario-IAD Washington, D.C. Dulles Intl

8h 59m1 stop Seattle/Tacoma Intl

12:30 pm - 7:26 pmIAD Washington, D.C. Dulles Intl-ONT Ontario

9h 56m1 stop Dallas/Fort Worth

$278Multiple Airlines

Wed, Aug 26 - Mon, Sep 14

10:25 am - 8:24 pmONT Ontario-IAD Washington, D.C. Dulles Intl

6h 59m1 stop Dallas/Fort Worth

7:13 pm - 11:52 pmIAD Washington, D.C. Dulles Intl-ONT Ontario

7h 39m1 stop Dallas/Fort Worth

$319American Airlines

Tue, Sep 15 - Sat, Oct 10

10:25 am - 8:24 pmONT Ontario-IAD Washington, D.C. Dulles Intl

6h 59m1 stop Dallas/Fort Worth

6:52 am - 1:25 pmIAD Washington, D.C. Dulles Intl-ONT Ontario

9h 33m1 stop Dallas/Fort Worth

$319American Airlines

Tue, Sep 15 - Sat, Sep 26

Cheap last minute flights

Enter your travel dates to find the best prices.

10:49 am - 9:59 pmONT Ontario-DCA Washington, D.C. Reagan-National

8h 10m1 stop Denver Intl

6:00 pm - 11:50 pmDCA Washington, D.C. Reagan-National-ONT Ontario

8h 50m1 stop Denver Intl

$315Frontier

Thu, Aug 13 - Sat, Aug 29

6:00 am - 4:59 pmONT Ontario-DCA Washington, D.C. Reagan-National

7h 59m1 stop Denver Intl

6:00 pm - 11:50 pmDCA Washington, D.C. Reagan-National-ONT Ontario

8h 50m1 stop Denver Intl

$318Frontier

Thu, Aug 13 - Mon, Aug 31

5:40 am - 6:00 pmONT Ontario-DCA Washington, D.C. Reagan-National

9h 20m2 stops Las Vegas Harry Reid Intl Dallas Love Field

6:05 am - 3:15 pmDCA Washington, D.C. Reagan-National-ONT Ontario

12h 10m2 stops Dallas Love Field Phoenix Sky Harbor Intl

$493Southwest

Sat, Aug 15 - Sat, Aug 29

7:05 am - 6:28 pmONT Ontario-IAD Washington, D.C. Dulles Intl

8h 23m1 stop Atlanta Hartsfield-Jackson

3:03 pm - 7:53 pmIAD Washington, D.C. Dulles Intl-ONT Ontario

7h 50m1 stop Atlanta Hartsfield-Jackson

$547Delta

Thu, Aug 13 - Tue, Sep 1

7:05 am - 6:28 pmONT Ontario-IAD Washington, D.C. Dulles Intl

8h 23m1 stop Atlanta Hartsfield-Jackson

7:00 am - 12:16 pmIAD Washington, D.C. Dulles Intl-ONT Ontario

8h 16m1 stop Salt Lake City

$547Delta

Thu, Aug 13 - Mon, Aug 31

10:29 am - 11:49 pmONT Ontario-IAD Washington, D.C. Dulles Intl

10h 20m2 stops Dallas/Fort Worth Charlotte Douglas

6:09 am - 1:31 pmIAD Washington, D.C. Dulles Intl-ONT Ontario

10h 22m1 stop Dallas/Fort Worth

$552American Airlines

Sun, Aug 16 - Mon, Aug 31

10:49 am - 9:59 pmONT Ontario-DCA Washington, D.C. Reagan-National

8h 10m1 stop Denver Intl

8:00 am - 4:10 pmDCA Washington, D.C. Reagan-National-ONT Ontario

11h 10m2 stops Seattle/Tacoma Intl Boise Air Term. Gowen Fld

$564Multiple Airlines

Thu, Aug 13 - Tue, Sep 1

6:00 am - 8:56 pmONT Ontario-IAD Washington, D.C. Dulles Intl

11h 56m2 stops Dallas/Fort Worth Charlotte Douglas

6:09 am - 11:43 amIAD Washington, D.C. Dulles Intl-ONT Ontario

8h 34m1 stop Dallas/Fort Worth

$572American Airlines

Sat, Aug 15 - Sat, Aug 29

10:49 am - 9:59 pmONT Ontario-DCA Washington, D.C. Reagan-National

8h 10m1 stop Denver Intl

5:20 pm - 11:04 amDCA Washington, D.C. Reagan-National-ONT Ontario

20h 44m2 stops Portland Seattle/Tacoma Intl

$579Multiple Airlines

Thu, Aug 13 - Sat, Aug 29

5:15 am - 4:55 pmONT Ontario-DCA Washington, D.C. Reagan-National

8h 40m2 stops Phoenix Sky Harbor Intl Chicago Midway

6:05 am - 3:15 pmDCA Washington, D.C. Reagan-National-ONT Ontario

12h 10m2 stops Dallas Love Field Phoenix Sky Harbor Intl

$618Southwest

Thu, Aug 13 - Sat, Aug 29

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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

Sep 4

ONT1:06 pmOntario

7h 33m

1 stop

IAD11:39 pmWashington, D.C. Dulles Intl

Sep 5

IAD6:00 amWashington, D.C. Dulles Intl

7h 42m

1 stop

ONT10:42 amOntario

$274

Delta

Sep 4

ONT1:06 pmOntario

7h 33m

1 stop

IAD11:39 pmWashington, D.C. Dulles Intl

Sep 11

IAD3:15 pmWashington, D.C. Dulles Intl

7h 50m

1 stop

ONT8:05 pmOntario

$291

Delta

Sep 8

ONT12:17 pmOntario

9h 24m

1 stop

IAD12:41 amWashington, D.C. Dulles Intl

Sep 12

IAD6:00 amWashington, D.C. Dulles Intl

8h 05m

1 stop

ONT11:05 amOntario

$319

Frontier flights from Ontario to District of Columbia

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

Frontier

Aug 25

ONT6:00 amOntario

7h 59m

1 stop

DCA4:59 pmWashington, D.C. Reagan-National

Sep 15

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

8h 47m

1 stop

ONT11:47 pmOntario

$265

Frontier

Oct 2

ONT6:15 amOntario

12h 44m

1 stop

DCA9:59 pmWashington, D.C. Reagan-National

Oct 4

DCA1:06 pmWashington, D.C. Reagan-National

13h 41m

1 stop

ONT11:47 pmOntario

$266

Frontier

Aug 31

ONT10:17 pmOntario

6h 47m

1 stop

IAD8:04 amWashington, D.C. Dulles Intl

Sep 22

IAD6:00 amWashington, D.C. Dulles Intl

13h 59m

1 stop

ONT4:59 pmOntario

$267

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 - DCA Washington, D.C. Reagan-National

ONTDCA

Ontario

Tue 8/25

6:00 am-4:59 pm

1 stop7h 59m

Washington, D.C. Reagan-National

Tue 9/15

6:00 pm-11:47 pm

1 stop8h 47m

$265

OntarioWashington, D.C.

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

ONTDCA

Ontario

Fri 10/16

11:55 pm-11:00 am

1 stop8h 05m

Washington, D.C. Reagan-National

Mon 10/19

4:20 pm-10:15 pm

2 stops8h 55m

$266

OntarioWashington, D.C.

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

ONTDCA

Ontario

Fri 10/2

6:15 am-9:59 pm

1 stop12h 44m

Washington, D.C. Reagan-National

Sun 10/4

1:06 pm-11:47 pm

1 stop13h 41m

$266

OntarioWashington, D.C.

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

ONTDCA

Ontario

Fri 10/16

5:20 am-4:25 pm

2 stops8h 05m

Washington, D.C. Reagan-National

Mon 10/19

4:20 pm-10:15 pm

2 stops8h 55m

$271

OntarioWashington, D.C.

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

ONTIAD

Ontario

Fri 10/30

1:24 pm-11:35 pm

1 stop7h 11m

Washington, D.C. Dulles Intl

Tue 11/3

6:13 am-12:21 pm

1 stop9h 08m

$274

OntarioWashington, D.C.

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

ONTIAD

Ontario

Tue 11/10

1:25 pm-11:37 pm

1 stop7h 12m

Washington, D.C. Dulles Intl

Fri 11/13

5:00 pm-9:59 pm

1 stop7h 59m

$274

OntarioWashington, D.C.

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

ONTIAD

Ontario

Fri 9/18

8:24 pm-6:20 am

1 stop6h 56m

Washington, D.C. Dulles Intl

Tue 9/22

7:00 am-2:16 pm

1 stop10h 16m

$277

OntarioWashington, D.C.

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

ONTIAD

Ontario

Wed 8/26

12:00 pm-11:59 pm

1 stop8h 59m

Washington, D.C. Dulles Intl

Mon 9/14

12:30 pm-7:26 pm

1 stop9h 56m

$278

Quickest round-trip

OntarioWashington, D.C.

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

ONTIAD

Ontario

Tue 9/15

10:25 am-8:24 pm

1 stop6h 59m

Washington, D.C. Dulles Intl

Sat 10/10

7:13 pm-11:52 pm

1 stop7h 39m

$319

OntarioWashington, D.C.

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

ONTIAD

Ontario

Tue 9/15

10:25 am-8:24 pm

1 stop6h 59m

Washington, D.C. Dulles Intl

Sat 9/26

6:52 am-1:25 pm

1 stop9h 33m

$319

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 $286. If you don’t want to visit District of Columbia in September, then you should wait until January to fly from Ontario, when ticket prices are also cheap, with an average price of $380.

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 22% 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 40m
Direct flights	None

The fastest flight from Ontario to District of Columbia takes 6h 40m

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 August 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 $105	Free Cancellation	Rating 5.6 2,701 reviews	Search Frontier flights
Delta	PriceFrom $183	Free Cancellation	Rating 7.8 8,505 reviews	Search Delta flights
United Airlines	PriceFrom $226	Free Cancellation	Rating 7.4 10,111 reviews	Search United Airlines flights
Southwest	PriceFrom $304	Free Cancellation	Rating 8.0 4,220 reviews	Search Southwest flights
American Airlines	PriceFrom $312	Free Cancellation	Rating 7.1 11,910 reviews	Search American Airlines flights
JetBlue	PriceFrom $361	Free Cancellation	Rating 7.1 3,035 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.