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

Frontier is the most popular carrier operating from Washington, D.C. Reagan-National to Ontario

What airlines fly to Ontario?

American Airlines, Alaska Airlines and Southwest are the top three most popular airlines that fly to Ontario from Washington, D.C. Reagan-National Airport 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 Ontario. Keep in mind that there are 8 different airlines that fly to Ontario on a routine basis, so you have a few additional options to choose from.

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

As of June 2026, there are 3 operators available to choose from for flights from Washington, D.C. Reagan-National Airport to Ontario Airport.

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

Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Washington, D.C. Reagan-National Airport to Ontario Airport.

What documentation or ID do you need to fly to Ontario Airport?

The travel and health documents required for your trip to Ontario Airport 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 Ontario Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

$118 Cheap Flights from Washington, D.C. Reagan-National Airport to Ontario in 2026

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

Prices are currently low for flights on this route. Typical prices usually range from $410 to $590. The lowest price recently found on this route was $307.

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Washington, D.C. Reagan-National Airport to Los Angeles

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

6:00 pm - 11:50 pm

DCA

ONT

8h 50m

1 stop

10:49 am - 9:59 pm

ONT

DCA

8h 10m

1 stop

$307Frontier

Fri, Aug 7 - Sat, Aug 15

7:00 am - 10:04 am

DCA

ONT

30h 04m

1 stop

6:00 am - 12:51 pm

ONT

DCA

27h 51m

1 stop

$310Frontier

Fri, Aug 14 - Sun, Aug 16

7:00 am - 11:49 pm

DCA

ONT

19h 49m

1 stop

6:00 am - 9:59 pm

ONT

DCA

12h 59m

1 stop

$322Frontier

Sat, Jul 4 - Sat, Jul 11

6:00 pm - 11:49 pm

DCA

ONT

8h 49m

1 stop

6:00 am - 9:59 pm

ONT

DCA

12h 59m

1 stop

$323Frontier

Fri, Jul 3 - Sat, Jul 11

7:00 am - 11:49 pm

DCA

ONT

19h 49m

1 stop

6:00 am - 9:59 pm

ONT

DCA

12h 59m

1 stop

$324Frontier

Sat, Jul 4 - Sat, Jul 11

7:00 am - 1:57 pm

DCA

ONT

9h 57m

1 stop

11:38 am - 4:56 pm

ONT

DCA

26h 18m

1 stop

$325Frontier

Tue, Oct 6 - Wed, Oct 14

7:00 am - 11:50 pm

DCA

ONT

19h 50m

1 stop

6:00 am - 12:51 pm

ONT

DCA

27h 51m

1 stop

$326Frontier

Wed, Jul 8 - Wed, Jul 15

5:16 pm - 11:52 pm

DCA

ONT

9h 36m

1 stop

10:50 am - 12:57 pm

ONT

DCA

23h 07m

1 stop

$327Multiple Airlines

Tue, Aug 11 - Tue, Aug 18

7:00 am - 10:04 am

DCA

ONT

30h 04m

1 stop

6:00 am - 12:51 pm

ONT

DCA

27h 51m

1 stop

$328Frontier

Sun, Jul 19 - Sun, Jul 26

7:00 am - 11:49 pm

DCA

ONT

19h 49m

1 stop

6:00 am - 9:59 pm

ONT

DCA

12h 59m

1 stop

$329Frontier

Sat, Jul 4 - Sat, Jul 11

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

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

Frontier

Aug 7

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

8h 50m

1 stop

ONT11:50 pmOntario

Aug 15

ONT10:49 amOntario

8h 10m

1 stop

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

$307

Frontier

Aug 8

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

23h 05m

1 stop

ONT10:04 amOntario

Aug 22

ONT10:50 amOntario

23h 07m

1 stop

DCA12:57 pmWashington, D.C. Reagan-National

$310

Frontier

Aug 27

DCA2:00 pmWashington, D.C. Reagan-National

23h 05m

1 stop

ONT10:05 amOntario

Aug 30

ONT6:00 amOntario

27h 57m

1 stop

DCA12:57 pmWashington, D.C. Reagan-National

$317

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

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

Delta

Aug 11

DCA5:59 pmWashington, D.C. Reagan-National

8h 35m

1 stop

ONT11:34 pmOntario

Aug 17

ONT10:00 pmOntario

8h 10m

1 stop

DCA9:10 amWashington, D.C. Reagan-National

$341

Delta

Oct 31

DCA1:45 pmWashington, D.C. Reagan-National

7h 33m

1 stop

ONT6:18 pmOntario

Nov 9

ONT10:59 pmOntario

7h 13m

1 stop

DCA9:12 amWashington, D.C. Reagan-National

$351

Delta

Jul 3

DCA5:15 pmWashington, D.C. Reagan-National

7h 33m

1 stop

ONT9:48 pmOntario

Jul 8

ONT11:48 amOntario

8h 00m

1 stop

DCA10:48 pmWashington, D.C. Reagan-National

$361

momondo Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

Quickest round-trip

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Fri 8/7

6:00 pm-11:50 pm

1 stop8h 50m

Ontario

Sat 8/15

10:49 am-9:59 pm

1 stop8h 10m

$307

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Fri 8/14

7:00 am-10:04 am

1 stop30h 04m

Ontario

Sun 8/16

6:00 am-12:51 pm

1 stop27h 51m

$310

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Sat 7/4

7:00 am-11:49 pm

1 stop19h 49m

Ontario

Sat 7/11

6:00 am-9:59 pm

1 stop12h 59m

$322

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Fri 7/3

6:00 pm-11:49 pm

1 stop8h 49m

Ontario

Sat 7/11

6:00 am-9:59 pm

1 stop12h 59m

$323

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Sat 7/4

7:00 am-11:49 pm

1 stop19h 49m

Ontario

Sat 7/11

6:00 am-9:59 pm

1 stop12h 59m

$324

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Tue 10/6

7:00 am-1:57 pm

1 stop9h 57m

Ontario

Wed 10/14

11:38 am-4:56 pm

1 stop26h 18m

$325

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Wed 7/8

7:00 am-11:50 pm

1 stop19h 50m

Ontario

Wed 7/15

6:00 am-12:51 pm

1 stop27h 51m

$326

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Tue 8/11

5:16 pm-11:52 pm

1 stop9h 36m

Ontario

Tue 8/18

10:50 am-12:57 pm

1 stop23h 07m

$327

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Sun 7/19

7:00 am-10:04 am

1 stop30h 04m

Ontario

Sun 7/26

6:00 am-12:51 pm

1 stop27h 51m

$328

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Sat 7/4

7:00 am-11:49 pm

1 stop19h 49m

Ontario

Sat 7/11

6:00 am-9:59 pm

1 stop12h 59m

$329

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 Washington, D.C. Reagan-National Airport to Ontario

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

What is the cheapest month to fly to Ontario?

In general, September is the cheapest month to fly from Washington, D.C. Reagan-National Airport to Ontario. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $297. If you aren’t able to travel during the month of September, then book flights to Ontario from Washington, D.C. Reagan-National Airport during August instead. Flights to Ontario in August, while not as cheap as those in September, still average around $326.

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

As of June 2026, prices for Washington, D.C. Reagan-National Airport to Ontario flights are approximately 29% cheaper when compared to flights at the same time last year.

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

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

Estimated round-trip price

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

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

Fastest flight time	7h 33m
Direct flights	None

The fastest flight from Washington, D.C. Reagan-National Airport to Ontario takes 7h 33m

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

Search flight deals

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

How far is Washington, D.C. Reagan-National to Ontario by plane?
Washington, D.C. Reagan-National and Ontario are 2260.8 mi apart from one another. By plane, this route typically takes 7h 33m.
When did momondo last update prices for flights from Washington, D.C. Reagan-National Airport to Ontario Airport?
Prices for flights from Washington, D.C. Reagan-National Airport to Ontario Airport refresh daily.
How many operators does momondo search for flights from Washington, D.C. Reagan-National Airport to Ontario Airport?
As of June 2026, there are 3 operators available to choose from for flights from Washington, D.C. Reagan-National Airport to Ontario Airport.
How old do you have to be to fly from Washington, D.C. Reagan-National Airport to Ontario Airport?
Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Washington, D.C. Reagan-National Airport to Ontario Airport.
What documentation or ID do you need to fly to Ontario Airport?
The travel and health documents required for your trip to Ontario Airport 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 Ontario Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.
What is the most popular airline from Washington, D.C. Reagan-National Airport to Ontario?
Based on momondo bookings for this flight route, the most popular airline on flight routes from Washington, D.C. Reagan-National Airport to Ontario is American Airlines (46% of total bookings). The next most popular airlines are Frontier (34%) and Southwest (19%).

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

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

Airline	Rating	Free Cancellation	Price
Frontier	PriceFrom $165	Free Cancellation	Rating 5.6 2,876 reviews	Search Frontier flights
American Airlines	PriceFrom $283	Free Cancellation	Rating 7.1 11,724 reviews	Search American Airlines flights
Southwest	PriceFrom $326	Free Cancellation	Rating 7.9 4,242 reviews	Search Southwest flights

Why use momondo?

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

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Washington, D.C. to Ontario for you.

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

momondo does allow users to show only those flights to Ontario from Washington, D.C. which offer a flexible booking policy as well as other useful filters and features.

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

momondo provides multiple filters to help you find the best flight to Ontario from Washington, D.C.. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

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

Price alerts on flights to Ontario from Washington, D.C. are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

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Cheap flights from Washington, D.C. Reagan-National Airport to Los Angeles from $118

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

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

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

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

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

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

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

What is the cheapest month to fly to Ontario?

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

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

What airlines fly to Ontario?

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

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

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

Fastest flight time

Direct flights

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

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

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

Why use momondo?

An easier way to manage your Ontario trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

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Daily price changes in your inbox - only with Price Alerts.

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