What airlines fly to Washington, D.C. Reagan-National Airport?

American Airlines, Alaska Airlines and Southwest are the top three most popular airlines that fly to Washington, D.C. Reagan-National Airport from Ontario according to our data. American Airlines is the first choice among our users, with 46% of people opting to fly with this airline when traveling to Washington, D.C. Reagan-National Airport. Keep in mind that there are 8 different airlines that fly to Washington, D.C. Reagan-National Airport on a routine basis, so you have a few additional options to choose from.

Which layover airport offers the lowest fares from Ontario to Washington, D.C. Reagan-National Airport?

Flights via Denver (DEN) offer the lowest average round-trip price of $264.

What is the cheapest airline that flies from Ontario to Washington, D.C. Reagan-National?

Delta and United Airlines are the most popular carriers operating from Ontario to Washington, D.C. Reagan-National

Which airport is the most popular layover for flights between Ontario and Washington, D.C. Reagan-National Airport?

Denver (DEN) was the most common stop: 57% of momondo users choosing 1-stop flights on this route connected there.

Which layover airport has the shortest connection time from Ontario to Washington, D.C. Reagan-National Airport?

Atlanta (ATL) has the shortest average layover time for this route: 1h 22m.

Which layover airport has the shortest travel time from Ontario to Washington, D.C. Reagan-National Airport?

Flights connecting via Atlanta (ATL) have the shortest average one-way travel time: 7h 36m.

When did momondo last update prices for flights from Ontario Airport to Washington, D.C. Reagan-National Airport?

Prices for flights from Ontario Airport to Washington, D.C. Reagan-National Airport were last updated today.

How many operators does momondo search for flights from Ontario Airport to Washington, D.C. Reagan-National Airport?

The number of operators available for flights from Ontario Airport to Washington, D.C. Reagan-National Airport is 5 as of September 2026.

How old do you have to be to fly from Ontario Airport to Washington, D.C. Reagan-National Airport?

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 Washington, D.C. Reagan-National Airport.

What documentation or ID do you need to fly to Washington, D.C. Reagan-National Airport?

The required travel and health documents for your Washington, D.C. Reagan-National Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Washington, D.C. Reagan-National Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

$123 Cheap Flights from Ontario to Washington, D.C. Reagan-National Airport in 2026

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Ontario to Washington, D.C.

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11:52 am - 9:59 pmONT Ontario-DCA Washington, D.C. Reagan-National

7h 07m1 stop Denver Intl

7:00 am - 11:51 pmDCA Washington, D.C. Reagan-National-ONT Ontario

19h 51m1 stop Denver Intl

$265Frontier

Wed, Oct 21 - Wed, Oct 28

11:52 am - 9:59 pmONT Ontario-DCA Washington, D.C. Reagan-National

7h 07m1 stop Denver Intl

7:00 am - 11:51 pmDCA Washington, D.C. Reagan-National-ONT Ontario

19h 51m1 stop Denver Intl

$266Frontier

Wed, Oct 21 - Wed, Oct 28

12:44 pm - 11:59 pmONT Ontario-DCA Washington, D.C. Reagan-National

8h 15m1 stop Dallas/Fort Worth

6:23 pm - 11:19 pmDCA Washington, D.C. Reagan-National-ONT Ontario

7h 56m1 stop Chicago O'Hare Intl

$351American Airlines

Thu, Jan 28 - Tue, Feb 2

10:30 am - 10:46 pmONT Ontario-DCA Washington, D.C. Reagan-National

9h 16m1 stop Dallas/Fort Worth

6:23 pm - 11:19 pmDCA Washington, D.C. Reagan-National-ONT Ontario

7h 56m1 stop Chicago O'Hare Intl

$351American Airlines

Wed, Dec 16 - Thu, Jan 7

7:00 am - 8:08 pmONT Ontario-DCA Washington, D.C. Reagan-National

10h 08m1 stop Chicago O'Hare Intl

4:18 pm - 8:58 pmDCA Washington, D.C. Reagan-National-ONT Ontario

7h 40m1 stop Denver Intl

$351United Airlines

Sat, Oct 17 - Sat, Oct 24

12:18 pm - 11:46 pmONT Ontario-DCA Washington, D.C. Reagan-National

8h 28m1 stop Atlanta Hartsfield-Jackson

12:26 pm - 7:49 pmDCA Washington, D.C. Reagan-National-ONT Ontario

10h 23m1 stop Atlanta Hartsfield-Jackson

$351Delta

Wed, Nov 18 - Thu, Nov 26

12:18 pm - 10:45 pmONT Ontario-DCA Washington, D.C. Reagan-National

7h 27m1 stop Atlanta Hartsfield-Jackson

6:00 am - 11:08 amDCA Washington, D.C. Reagan-National-ONT Ontario

8h 08m1 stop Atlanta Hartsfield-Jackson

$351Delta

Wed, Nov 18 - Wed, Dec 2

6:50 am - 6:00 pmONT Ontario-DCA Washington, D.C. Reagan-National

8h 10m2 stops Denver Intl Omaha Eppley Airfield

6:20 am - 1:10 pmDCA Washington, D.C. Reagan-National-ONT Ontario

9h 50m1 stop Dallas Love Field

$356Southwest

Wed, Dec 16 - Thu, Jan 7

6:30 am - 6:15 pmONT Ontario-DCA Washington, D.C. Reagan-National

8h 45m1 stop Chicago Midway

6:00 am - 1:30 pmDCA Washington, D.C. Reagan-National-ONT Ontario

10h 30m2 stops Chicago Midway Las Vegas Harry Reid Intl

$356Southwest

Sat, Oct 31 - Sat, Nov 7

7:00 am - 5:03 pmONT Ontario-DCA Washington, D.C. Reagan-National

7h 03m1 stop Chicago O'Hare Intl

3:30 pm - 10:49 pmDCA Washington, D.C. Reagan-National-ONT Ontario

10h 19m1 stop Chicago O'Hare Intl

$371United Airlines

Sat, Oct 17 - Mon, Oct 19

Cheap last minute flights

Enter your travel dates to find the best prices.

11:45 am - 9:59 pmONT Ontario-DCA Washington, D.C. Reagan-National

7h 14m1 stop Denver Intl

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

8h 47m1 stop Denver Intl

$320Frontier

Wed, Sep 16 - Sat, Oct 3

11:45 am - 9:59 pmONT Ontario-DCA Washington, D.C. Reagan-National

7h 14m1 stop Denver Intl

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

8h 47m1 stop Denver Intl

$323Frontier

Wed, Sep 16 - Sat, Oct 3

8:30 am - 8:55 pmONT Ontario-DCA Washington, D.C. Reagan-National

9h 25m2 stops Austin Bergstrom New Orleans Louis Armstrong

1:00 pm - 8:40 pmDCA Washington, D.C. Reagan-National-ONT Ontario

10h 40m2 stops Chicago Midway Las Vegas Harry Reid Intl

$559Southwest

Wed, Sep 16 - Sat, Oct 3

12:17 pm - 10:40 pmONT Ontario-DCA Washington, D.C. Reagan-National

7h 23m1 stop Atlanta Hartsfield-Jackson

5:59 pm - 10:11 pmDCA Washington, D.C. Reagan-National-ONT Ontario

7h 12m1 stop Salt Lake City

$577Delta

Fri, Sep 11 - Sat, Oct 10

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

8h 40m2 stops Phoenix Sky Harbor Intl Chicago Midway

1:00 pm - 8:05 pmDCA Washington, D.C. Reagan-National-ONT Ontario

10h 05m2 stops Chicago Midway Las Vegas Harry Reid Intl

$665Southwest

Fri, Sep 11 - Sat, Sep 12

12:17 pm - 10:40 pmONT Ontario-DCA Washington, D.C. Reagan-National

7h 23m1 stop Atlanta Hartsfield-Jackson

6:00 am - 11:09 amDCA Washington, D.C. Reagan-National-ONT Ontario

8h 09m1 stop Atlanta Hartsfield-Jackson

$727Delta

Mon, Sep 14 - Thu, Sep 17

9:01 am - 10:30 pmONT Ontario-DCA Washington, D.C. Reagan-National

10h 29m1 stop San Francisco

12:57 pm - 10:59 pmDCA Washington, D.C. Reagan-National-ONT Ontario

13h 02m2 stops Houston George Bush Intcntl San Francisco

$736United Airlines

Wed, Sep 16 - Thu, Sep 24

9:01 am - 10:30 pmONT Ontario-DCA Washington, D.C. Reagan-National

10h 29m1 stop San Francisco

12:57 pm - 10:59 pmDCA Washington, D.C. Reagan-National-ONT Ontario

13h 02m2 stops Houston George Bush Intcntl San Francisco

$756United Airlines

Wed, Sep 16 - Thu, Sep 24

4:50 pm - 4:00 pmONT Ontario-DCA Washington, D.C. Reagan-National

20h 10m2 stops Boise Air Term. Gowen Fld Portland

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

8h 47m1 stop Denver Intl

$756Multiple Airlines

Tue, Sep 15 - Sun, Sep 20

7:12 am - 4:00 pmONT Ontario-DCA Washington, D.C. Reagan-National

29h 48m1 stop Portland

6:59 pm - 7:03 pmDCA Washington, D.C. Reagan-National-ONT Ontario

27h 04m2 stops San Francisco Seattle/Tacoma Intl

$915Alaska Airlines

Wed, Sep 16 - Wed, Sep 23

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Frontier flights from Ontario to Washington, D.C. Reagan-National Airport

Our best Frontier deals on Ontario to Washington, D.C. Reagan-National Airport flight tickets

Frontier

Oct 21

ONT11:52 amOntario

7h 07m

1 stop

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

Oct 28

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

19h 51m

1 stop

ONT11:51 pmOntario

$265

Frontier

Sep 30

ONT11:45 amOntario

7h 14m

1 stop

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

Oct 7

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

19h 47m

1 stop

ONT11:47 pmOntario

$266

Frontier

Nov 6

ONT6:25 amOntario

7h 22m

1 stop

DCA4:47 pmWashington, D.C. Reagan-National

Nov 11

DCA1:00 pmWashington, D.C. Reagan-National

13h 51m

1 stop

ONT11:51 pmOntario

$267

momondo Fare Finder

Use the filters below to find and compare flights from Ontario to Washington, D.C. Reagan-National Airport 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

Wed 10/21

11:52 am-9:59 pm

1 stop7h 07m

Washington, D.C. Reagan-National

Wed 10/28

7:00 am-11:51 pm

1 stop19h 51m

$265

OntarioWashington, D.C.

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

ONTDCA

Ontario

Wed 10/21

11:52 am-9:59 pm

1 stop7h 07m

Washington, D.C. Reagan-National

Wed 10/28

7:00 am-11:51 pm

1 stop19h 51m

$266

OntarioWashington, D.C.

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

ONTDCA

Ontario

Thu 1/28

12:44 pm-11:59 pm

1 stop8h 15m

Washington, D.C. Reagan-National

Tue 2/2

6:23 pm-11:19 pm

1 stop7h 56m

$351

OntarioWashington, D.C.

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

ONTDCA

Ontario

Wed 12/16

10:30 am-10:46 pm

1 stop9h 16m

Washington, D.C. Reagan-National

Thu 1/7

6:23 pm-11:19 pm

1 stop7h 56m

$351

OntarioWashington, D.C.

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

ONTDCA

Ontario

Sat 10/17

7:00 am-8:08 pm

1 stop10h 08m

Washington, D.C. Reagan-National

Sat 10/24

4:18 pm-8:58 pm

1 stop7h 40m

$351

OntarioWashington, D.C.

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

ONTDCA

Ontario

Wed 11/18

12:18 pm-11:46 pm

1 stop8h 28m

Washington, D.C. Reagan-National

Thu 11/26

12:26 pm-7:49 pm

1 stop10h 23m

$351

Quickest round-trip

OntarioWashington, D.C.

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

ONTDCA

Ontario

Wed 11/18

12:18 pm-10:45 pm

1 stop7h 27m

Washington, D.C. Reagan-National

Wed 12/2

6:00 am-11:08 am

1 stop8h 08m

$351

OntarioWashington, D.C.

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

ONTDCA

Ontario

Wed 12/16

6:50 am-6:00 pm

2 stops8h 10m

Washington, D.C. Reagan-National

Thu 1/7

6:20 am-1:10 pm

1 stop9h 50m

$356

OntarioWashington, D.C.

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

ONTDCA

Ontario

Sat 10/31

6:30 am-6:15 pm

1 stop8h 45m

Washington, D.C. Reagan-National

Sat 11/7

6:00 am-1:30 pm

2 stops10h 30m

$356

OntarioWashington, D.C.

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

ONTDCA

Ontario

Sat 10/17

7:00 am-5:03 pm

1 stop7h 03m

Washington, D.C. Reagan-National

Mon 10/19

3:30 pm-10:49 pm

1 stop10h 19m

$371

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 Washington, D.C. Reagan-National Airport

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

Layovers

What is the typical price of a round-trip flight between Ontario and Washington, D.C. Reagan-National Airport?

Prices are currently typical for flights on this route.

Typical prices usually range from $248 to $504.
The lowest price recently found on this route was $265.

What is the cheapest month to fly to Washington, D.C. Reagan-National Airport?

The month of January is, on average, the cheapest month to fly to Washington, D.C. Reagan-National Airport from Ontario, with most prices found around $265. If you aren’t able to travel to Washington, D.C. Reagan-National Airport during the month of January, then flying in February is also cheap. Prices for this month can be found on momondo for an average of $318.

What is the cheapest day to depart on your flight to Washington, D.C. Reagan-National Airport?

The cheapest day to depart from Ontario to Washington, D.C. Reagan-National Airport is on a Wednesday. Travelers who choose to depart for Washington, D.C. Reagan-National Airport on a Wednesday will often find tickets for as low as $476. Flights from Ontario to Washington, D.C. Reagan-National Airport on a Sunday will generally be more expensive and average around $665. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

What is the cheapest time of day to depart on your flight to Washington, D.C. Reagan-National Airport?

Our data shows that the cheapest Ontario to Washington, D.C. Reagan-National Airport flights are usually those with departure times in the afternoon. Our users have found flights to Washington, D.C. Reagan-National Airport in the afternoon for as low as $432. In contrast, the most expensive time of day to depart to Washington, D.C. Reagan-National Airport is in the morning when prices are around $529.

How far in advance should I book a flight from Ontario to Washington, D.C. Reagan-National Airport?

You are more likely to see cheaper flights to Washington, D.C. Reagan-National Airport from Ontario when booking weeks ahead of your departure date. In general, you can expect to find flights to Washington, D.C. Reagan-National Airport for around $422 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Washington, D.C. Reagan-National Airport from Ontario for as low as $363 on momondo.

How have Ontario to Washington, D.C. Reagan-National Airport flight prices changed over time?

As of September 2026, prices for Ontario to Washington, D.C. Reagan-National Airport flights are approximately 42% more expensive when compared to flights at the same time last year.

When to book flights from Ontario to Washington, D.C. Reagan-National Airport

Are you open to changing your travel dates? Check out the ideal times to fly from Ontario to Washington, D.C. Reagan-National Airport according to our flight data. Find out which month and days have the cheapest flights.

Estimated round-trip price

Cheap Ontario to Washington, D.C. Reagan-National Airport (ONT to DCA) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Ontario to Washington, D.C. Reagan-National Airport

Best Price Found	$123
Fastest flight time	6h 58m
Direct flights	None

The best one-way flight to Washington, D.C. Reagan-National Airport from Ontario in the past 72 hours is $123. The best round-trip flight deal from Ontario to Washington, D.C. Reagan-National Airport found on momondo in the last 72 hours is $265.

The fastest flight from Ontario to Washington, D.C. Reagan-National Airport takes 6h 58m

There are no direct flights from Ontario to Washington, D.C. Reagan-National Airport. There are no popular flight routes from Ontario to Washington, D.C. Reagan-National Airport.

Search flight deals

Frequently asked questions about flying from Ontario to Washington, D.C. Reagan-National Airport

How far is Ontario to Washington, D.C. Reagan-National by plane?
The distance between Ontario and Washington, D.C. Reagan-National is about 2260.8 mi. A reasonable flight in good conditions will take 6h 58m.
When did momondo last update prices for flights from Ontario Airport to Washington, D.C. Reagan-National Airport?
Prices for flights from Ontario Airport to Washington, D.C. Reagan-National Airport were last updated today.
How many operators does momondo search for flights from Ontario Airport to Washington, D.C. Reagan-National Airport?
The number of operators available for flights from Ontario Airport to Washington, D.C. Reagan-National Airport is 5 as of September 2026.
How old do you have to be to fly from Ontario Airport to Washington, D.C. Reagan-National Airport?
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 Washington, D.C. Reagan-National Airport.
What documentation or ID do you need to fly to Washington, D.C. Reagan-National Airport?
The required travel and health documents for your Washington, D.C. Reagan-National Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Washington, D.C. Reagan-National Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.
What is the most popular airline from Ontario to Washington, D.C. Reagan-National Airport?
momondo data reveals that the most frequently booked airline on the route from Ontario to Washington, D.C. Reagan-National Airport is Frontier, representing 32% of all bookings. The subsequent popular airlines are Southwest at 30%, American Airlines at 19%, and United Airlines at 13%.

Best airlines flying from Ontario to Washington, D.C. Reagan-National Airport

Compare and see reviews for airlines that fly from Ontario to Washington, D.C. Reagan-National Airport with momondo

Airline	Rating	Free Cancellation	Price
Frontier	PriceFrom $170	Free Cancellation	Rating 5.6 2,611 reviews	Search Frontier flights
Delta	PriceFrom $208	Free Cancellation	Rating 7.8 8,553 reviews	Search Delta flights
United Airlines	PriceFrom $310	Free Cancellation	Rating 7.4 10,194 reviews	Search United Airlines flights
American Airlines	PriceFrom $336	Free Cancellation	Rating 7.1 12,047 reviews	Search American Airlines flights
Southwest	PriceFrom $338	Free Cancellation	Rating 8.0 4,195 reviews	Search Southwest flights

Alexandria

National Harbor

Arlington

Gettysburg

Laurel

Waldorf

Fredericksburg

Woodbridge

Gaithersburg

Linthicum Heights

Rockville

Silver Spring

Towson

Fairfax

Springfield

Colonial Beach

Glen Burnie

Edgewood

Bethesda

College Park

Why use momondo?

Why should I use momondo to find a flight deal from Ontario to Washington, D.C.?

It is quick and easy to find Ontario to Washington, D.C. flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Washington, D.C. that suits you.

Can I find flights from Ontario to Washington, D.C. with flexible booking policies on momondo?

All flight searches from Ontario to Washington, D.C. on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from Ontario to Washington, D.C.?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Ontario to Washington, D.C..

I’m not ready to book a flight from Ontario to Washington, D.C. right now. Can momondo alert me if prices change?

If you are simply researching potential flights to Washington, D.C., momondo offers a useful price alert feature which will track prices for flights to Washington, D.C. from Ontario and alert you when they change.

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Cheap flights from Ontario to Washington, D.C. from $123

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Ontario to Washington, D.C. departing on 10/7. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

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Frontier flights from Ontario to Washington, D.C. Reagan-National Airport

Our best Frontier deals on Ontario to Washington, D.C. Reagan-National Airport flight tickets

momondo Fare Finder

Use the filters below to find and compare flights from Ontario to Washington, D.C. Reagan-National Airport that are best for you.

See travel insights to Washington, D.C. from

How to get the cheapest flight ticket from Ontario to Washington, D.C. Reagan-National Airport

What is the typical price of a round-trip flight between Ontario and Washington, D.C. Reagan-National Airport?

What is the cheapest month to fly to Washington, D.C. Reagan-National Airport?

What is the cheapest day to depart on your flight to Washington, D.C. Reagan-National Airport?

What is the cheapest time of day to depart on your flight to Washington, D.C. Reagan-National Airport?

How far in advance should I book a flight from Ontario to Washington, D.C. Reagan-National Airport?

How have Ontario to Washington, D.C. Reagan-National Airport flight prices changed over time?

What is the cheapest airline that flies from Ontario to Washington, D.C. Reagan-National?

What airlines fly to Washington, D.C. Reagan-National Airport?

Which airport is the most popular layover for flights between Ontario and Washington, D.C. Reagan-National Airport?

Which layover airport offers the lowest fares from Ontario to Washington, D.C. Reagan-National Airport?

Which layover airport has the shortest travel time from Ontario to Washington, D.C. Reagan-National Airport?

Which layover airport has the shortest connection time from Ontario to Washington, D.C. Reagan-National Airport?

When to book flights from Ontario to Washington, D.C. Reagan-National Airport

Cheap Ontario to Washington, D.C. Reagan-National Airport (ONT to DCA) flight deals and tips

Best Price Found

Fastest flight time

Direct flights

Frequently asked questions about flying from Ontario to Washington, D.C. Reagan-National Airport

Best airlines flying from Ontario to Washington, D.C. Reagan-National Airport

Compare and see reviews for airlines that fly from Ontario to Washington, D.C. Reagan-National Airport with momondo

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