What are the cheapest airlines flying from Ontario to Washington, D.C. Reagan-National Airport round-trip?

Frontier, at $147, was found to be the cheapest airline from Ontario to Washington, D.C. Reagan-National Airport.Alternate airlines to your destination round-trip include United Airlines and Southwest. You may be able to fly from Ontario to Washington, D.C. Reagan-National Airport for 60% less than the average price by searching for these airlines.

What are the cheapest airlines to fly from Ontario to Washington, D.C. Reagan-National Airport one-way?

The cheapest airline one-way is Frontier, with whom users have recently found tickets for as low as $82. However, be on the lookout for offers from United Airlines and Delta, as they are both options that can get you from Ontario to Washington, D.C. Reagan-National Airport for a low price.

In terms of precipitation, rainfall in Washington, D.C. Reagan-National Airport ranges from 2.6 - 4.0 inches per month. May is typically the wettest month, when rainfall can reach 4.0 in. February is typically the driest time to visit Washington, D.C. Reagan-National Airport when rainfall is around 2.6 in.

If weather is an important factor for your trip to Washington, D.C. Reagan-National Airport, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 80.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 35.6 F).

What are the most popular airlines that fly from Ontario to Washington, D.C. Reagan-National Airport?

Before booking your flight from Ontario to Washington, D.C. Reagan-National Airport check out the most popular airlines for this route: Frontier, American Airlines or Southwest.

Most accurate provider : When it comes to deals on Ontario-Washington, D.C. Reagan-National Airport flights, users find the pricing of CheapOair to be most consistent on Cheapflights vs. CheapOair Users can find the same prices on Ontario-Washington, D.C. Reagan-National Airport flight deals on Cheapflights vs. CheapOair >95% of the time. Price accuracy is based on data collected from Ontario-Washington, D.C. Reagan-National Airport flight searches over the past month and is updated monthly.

Most trusted provider : When it comes to deals on Ontario-Washington, D.C. Reagan-National Airport flights, Cheapflights users trust CheapOair the most. CheapOair has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Ontario-Washington, D.C. Reagan-National Airport flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

What airport do you fly from for flights from Ontario to Washington, D.C. Reagan-National?

Ontario (ONT) is the airport you will fly out of if you book a flight from Ontario to Washington, D.C. Reagan-National. You should not have trouble finding flights to Washington, D.C. Reagan-National from Ontario; the airport handles an average of 0 outbound flights to Washington, D.C. Reagan-National per day. You should also have plenty of airline options to choose from since 5 airlines have flights from the Ontario airport to Washington, D.C. Reagan-National. It is only a 3.1 mi journey to Ontario (ONT) from Ontario’s city center.

Can I find deals for flights from Ontario to Reagan-National that include hotel bookings?

Yes. In addition to deals on Ontario to Reagan-National flights, Cheapflights offers vacation packages that include both flights and hotel.

How can I find direct flights from Ontario to Reagan-National?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ontario to Reagan-National.

Can I find deals for business class flights from Ontario to Reagan-National?

Yes. Cheapflights offers flight deals from Ontario to Reagan-National by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

$58+ Flights from Ontario to Washington, D.C. Reagan-National Airport

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Find cheap flights from Ontario to Reagan-National with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheapflights Tip: The best prices from Ontario to Washington, D.C. Reagan-National are usually found in September or February, booked 15 days in advance, depart on a Tuesday or Wednesday and return on a Saturday

Cheap flight deals from Ontario to Reagan-National

Cheapest flights from Ontario to Reagan-National
Explore the most affordable flight options available from Ontario to Reagan-National. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 10, 2025.

Wed 12/246:45 amONT - DCA

1 stop12h 14mFrontier

Thu 1/16:00 pmDCA - ONT

1 stop8h 59mFrontier

Deal found 12/9

$253

Wed 12/316:45 amONT - DCA

1 stop12h 14mFrontier

Tue 1/132:00 pmDCA - ONT

1 stop11h 59mFrontier

Deal found 12/7

$257

Thu 12/256:45 amONT - DCA

1 stop12h 14mFrontier

Thu 1/18:00 amDCA - ONT

1 stop18h 59mFrontier

Deal found 12/10

$258

Mon 12/153:20 pmONT - DCA

1 stop18h 46mFrontier

Mon 1/56:00 pmDCA - ONT

1 stop8h 59mFrontier

Deal found 12/8

$260

Wed 12/246:45 amONT - DCA

1 stop12h 14mFrontier

Sun 1/46:00 pmDCA - ONT

1 stop8h 59mFrontier

Deal found 12/9

$267

Wed 12/246:45 amONT - DCA

1 stop12h 14mFrontier

Fri 1/26:00 pmDCA - ONT

1 stop8h 59mFrontier

Deal found 12/9

$275

Tue 12/306:45 amONT - DCA

1 stop27h 16mFrontier

Sat 1/38:00 amDCA - ONT

1 stop18h 59mFrontier

Deal found 12/10

$279

Wed 12/246:45 amONT - DCA

1 stop12h 14mFrontier

Sat 1/32:00 pmDCA - ONT

1 stop12h 59mFrontier

Deal found 12/9

$282

Best flights from Ontario to Reagan-National
Discover carefully curated flight deals from Ontario to Reagan-National that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated December 10, 2025.

Thu 12/256:45 amONT - DCA

1 stop12h 14mFrontier

Fri 1/26:00 pmDCA - ONT

1 stop8h 59mFrontier

Deal found 12/9

$307

Sat 1/1710:30 pmONT - DCA

2 stops11h 27mDelta

Wed 1/219:59 amDCA - ONT

2 stops14h 06mDelta

Deal found 12/8

$357

Wed 3/45:15 amONT - DCA

1 stop7h 45mSouthwest

Mon 3/910:40 amDCA - ONT

2 stops10h 05mSouthwest

Deal found 12/8

$387

Tue 1/67:16 amONT - DCA

1 stop8h 25mAmerican Airlines

Thu 1/810:47 amDCA - ONT

1 stop10h 58mAmerican Airlines

Deal found 12/9

$418

Wed 12/246:45 amONT - DCA

1 stop12h 14mFrontier

Wed 12/312:00 pmDCA - ONT

1 stop12h 59mFrontier

Deal found 12/9

$342

Thu 1/812:41 pmONT - DCA

1 stop7h 51mDelta

Wed 1/141:40 pmDCA - ONT

1 stop10h 25mDelta

Deal found 12/10

$363

Sat 1/175:30 amONT - DCA

2 stops10h 20mSouthwest

Wed 1/216:00 amDCA - ONT

2 stops13h 05mSouthwest

Deal found 12/8

$405

Thu 12/256:45 amONT - DCA

1 stop12h 14mFrontier

Wed 12/318:00 amDCA - ONT

1 stop18h 59mFrontier

Deal found 12/8

$376

Thu 2/197:30 amONT - DCA

2 stops11h 30mDelta

Sun 2/225:10 pmDCA - ONT

1 stop9h 39mDelta

Deal found 12/9

$377

Sat 12/206:45 amONT - DCA

1 stop12h 14mFrontier

Thu 1/12:00 pmDCA - ONT

1 stop12h 59mFrontier

Deal found 12/8

$383

Mon 12/226:45 amONT - DCA

1 stop12h 14mFrontier

Sun 1/46:00 pmDCA - ONT

1 stop8h 59mFrontier

Deal found 12/9

$397

Thu 2/126:05 amONT - DCA

1 stop12h 54mFrontier

Mon 2/166:00 pmDCA - ONT

1 stop8h 59mFrontier

Deal found 12/10

$411

Last-minute flights from Ontario to Reagan-National
Discover last-minute flight deals from Ontario to Reagan-National. Data last updated December 10, 2025 and is based on user searches.

Mon 12/153:20 pmONT - DCA

1 stop18h 46mFrontier

Mon 1/56:00 pmDCA - ONT

1 stop8h 59mFrontier

Deal found 12/8

$260

Wed 12/246:45 amONT - DCA

1 stop12h 14mFrontier

Thu 1/16:00 pmDCA - ONT

1 stop8h 59mFrontier

Deal found 12/9

$253

Wed 12/246:45 amONT - DCA

1 stop12h 14mFrontier

Sun 1/46:00 pmDCA - ONT

1 stop8h 59mFrontier

Deal found 12/9

$267

Thu 12/256:45 amONT - DCA

1 stop12h 14mFrontier

Thu 1/18:00 amDCA - ONT

1 stop18h 59mFrontier

Deal found 12/10

$258

Wed 12/316:45 amONT - DCA

1 stop12h 14mFrontier

Wed 1/76:00 pmDCA - ONT

1 stop8h 14mFrontier

Deal found 12/7

$257

Thu 1/16:45 amONT - DCA

1 stop7h 14mFrontier

Mon 1/126:00 pmDCA - ONT

1 stop8h 56mFrontier

Deal found 12/9

$254

Sun 1/46:45 amONT - DCA

1 stop27h 16mFrontier

Thu 1/86:00 pmDCA - ONT

1 stop8h 56mFrontier

Deal found 12/9

$266

Mon 1/56:45 amONT - DCA

1 stop27h 17mFrontier

Thu 1/86:00 pmDCA - ONT

1 stop8h 56mFrontier

Deal found 12/9

$255

Fri 1/96:00 amONT - DCA

1 stop7h 59mFrontier

Sun 1/112:00 pmDCA - ONT

1 stop12h 56mFrontier

Deal found 12/10

$252

Wed 1/147:15 amONT - DCA

1 stop6h 44mFrontier

Mon 1/196:00 pmDCA - ONT

1 stop8h 59mFrontier

Deal found 12/10

$251

One-way flights from Ontario to Reagan-National
Search for one-way flight options from Ontario to Reagan-National. Find affordable one-way fares based on user searches. Data last updated December 10, 2025.

Sat 1/247:15 amONT - DCA

1 stop11h 44mFrontier

Deal found 12/9

$58

Wed 1/147:15 amONT - DCA

1 stop11h 44mFrontier

Deal found 12/9

$61

Sat 1/107:00 amONT - DCA

1 stop11h 59mFrontier

Deal found 12/10

$62

Tue 2/37:15 amONT - DCA

1 stop11h 44mFrontier

Deal found 12/8

$66

Tue 1/277:15 amONT - DCA

1 stop11h 44mFrontier

Deal found 12/7

$67

Sat 2/146:00 amONT - DCA

1 stop12h 59mFrontier

Deal found 12/9

$71

Tue 1/137:15 amONT - DCA

1 stop11h 44mFrontier

Deal found 12/10

$72

Thu 1/226:20 amONT - DCA

1 stop7h 39mFrontier

Deal found 12/8

$74

Thu 1/296:20 amONT - DCA

1 stop7h 39mFrontier

Deal found 12/10

$77

Wed 2/187:00 amONT - DCA

1 stop11h 59mFrontier

Deal found 12/9

$78

Find flight deals from Ontario to Reagan-National

Most accurate provider	CheapOair 3 stars
Most trusted provider	CheapOair 3 stars
Round-trip from	$251 (Frontier)
One-way from	$58 (Trip.com)
Popular in	November
Cheapest in	September
Average price	$468

Provider with most accurate pricing for Ontario-Washington, D.C. Reagan-National flight deals.

Search Deals

Provider most trusted by Cheapflights users for Ontario-Washington, D.C. Reagan-National flights.

Search Deals

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

Search Deals

One-way flight from Ontario to Washington, D.C. Reagan-National

Search Deals

Highest demand for flights based on searches. 10% potential increase in price ($45 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 2% potential price decrease ($8 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in December 2025

Search Deals

Cheapflights 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

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Thu 12/25

6:45 am-9:59 pm

1 stop12h 14m

Washington, D.C. Reagan-National

Fri 1/2

6:00 pm-11:59 pm

1 stop8h 59m

$307

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Wed 12/24

6:45 am-9:59 pm

1 stop12h 14m

Washington, D.C. Reagan-National

Wed 12/31

2:00 pm-11:59 pm

1 stop12h 59m

$342

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Sat 1/17

10:30 pm-12:57 pm

2 stops11h 27m

Washington, D.C. Reagan-National

Wed 1/21

9:59 am-9:05 pm

2 stops14h 06m

$357

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Thu 1/8

12:41 pm-11:32 pm

1 stop7h 51m

Washington, D.C. Reagan-National

Wed 1/14

1:40 pm-9:05 pm

1 stop10h 25m

$363

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Thu 12/25

6:45 am-9:59 pm

1 stop12h 14m

Washington, D.C. Reagan-National

Wed 12/31

8:00 am-11:59 pm

1 stop18h 59m

$376

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Thu 2/19

7:30 am-10:00 pm

2 stops11h 30m

Washington, D.C. Reagan-National

Sun 2/22

5:10 pm-11:49 pm

1 stop9h 39m

$377

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Sat 12/20

6:45 am-9:59 pm

1 stop12h 14m

Washington, D.C. Reagan-National

Thu 1/1

2:00 pm-11:59 pm

1 stop12h 59m

$383

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Wed 3/4

5:15 am-4:00 pm

1 stop7h 45m

Washington, D.C. Reagan-National

Mon 3/9

10:40 am-5:45 pm

2 stops10h 05m

$387

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Mon 12/22

6:45 am-9:59 pm

1 stop12h 14m

Washington, D.C. Reagan-National

Sun 1/4

6:00 pm-11:59 pm

1 stop8h 59m

$397

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Sat 1/17

5:30 am-6:50 pm

2 stops10h 20m

Washington, D.C. Reagan-National

Wed 1/21

6:00 am-4:05 pm

2 stops13h 05m

$405

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/9

Showing 1-10 of 23 results

Compare providers for flights from Ontario to Reagan-National

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Ontario to Reagan-National in December.

Provider	Price Accuracy	Trust Score*
Expedia	Price Accuracy2 stars	Trust Score*3 stars
FlightHub	Price Accuracy3 stars	Trust Score*1 star
eDreams	Price Accuracy3 stars	Trust Score*3 stars
Cheapflightsfares	Price Accuracy3 stars	Trust Score*2 stars
CheapOair	Price Accuracy3 stars	Trust Score*3 stars
Priceline	Price Accuracy1 star	Trust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

Most accurate provider: When it comes to deals on Ontario-Washington, D.C. Reagan-National Airport flights, users find the pricing of CheapOair to be most consistent on Cheapflights vs. CheapOair Users can find the same prices on Ontario-Washington, D.C. Reagan-National Airport flight deals on Cheapflights vs. CheapOair >95% of the time. Price accuracy is based on data collected from Ontario-Washington, D.C. Reagan-National Airport flight searches over the past month and is updated monthly.
Most trusted provider: When it comes to deals on Ontario-Washington, D.C. Reagan-National Airport flights, Cheapflights users trust CheapOair the most. CheapOair has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Ontario-Washington, D.C. Reagan-National Airport flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Ontario to Reagan-National

Have a flexible travel schedule? Discover the best time to fly to Reagan-National from Ontario with our price prediction graph.

Estimated round-trip price

Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Ontario to Washington, D.C. Reagan-National Airport

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

Booking 15 days in advance of your planned departure date is, on average, the best time to get cheap flights from Ontario to Washington, D.C. Reagan-National Airport. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

What is the cheapest month to book a flight from Ontario to Washington, D.C. Reagan-National Airport?

Currently, June is the cheapest month in which you can book a flight from Ontario to Washington, D.C. Reagan-National Airport (average of $99). Flying from Ontario to Washington, D.C. Reagan-National Airport in July is currently the most expensive (average of $228). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from ONT to DCA?

When flying from Ontario to Washington, D.C. Reagan-National Airport, the time of day you fly usually plays a role in the price. Save by searching for a flight in the afternoon, which can drop the price by up to 47% versus a flight at noon.

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

Travelers seeking maximum savings on their Ontario to Washington, D.C. Reagan-National Airport flight should consider departing on Thursday afternoons when fares are most often at their lowest. Tuesday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

Reviews of airlines servicing Reagan-National

Read through reviews of airlines operating flights from Ontario to Washington, D.C. Reagan-National Airport, such as Southwest, Delta, and United Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

Southwest

7.9

Good

4,253 reviews

Reviews

1 / 20

10.0

Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.

Southwest

7.9

Good

4,253 reviews

Southwest

7.9

Good

4,253 reviews

Reviews

1 / 20

10.0

Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.

Delta

7.9

Good

8,007 reviews

Southwest

7.9

Good

4,253 reviews

Reviews

1 / 20

10.0

Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.

United Airlines

7.4

Good

9,092 reviews

Southwest

7.9

Good

4,253 reviews

Reviews

1 / 20

10.0

Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.

American Airlines

7.2

Good

11,048 reviews

Southwest

7.9

Good

4,253 reviews

Reviews

1 / 20

10.0

Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.

Frontier

5.8

Fair

3,085 reviews

Southwest

7.9

Good

4,253 reviews

Reviews

1 / 20

10.0

Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.

Related info for your journey

What airport do you fly from for flights from Ontario to Washington, D.C. Reagan-National?
Ontario (ONT) is the airport you will fly out of if you book a flight from Ontario to Washington, D.C. Reagan-National. You should not have trouble finding flights to Washington, D.C. Reagan-National from Ontario; the airport handles an average of 0 outbound flights to Washington, D.C. Reagan-National per day. You should also have plenty of airline options to choose from since 5 airlines have flights from the Ontario airport to Washington, D.C. Reagan-National. It is only a 3.1 mi journey to Ontario (ONT) from Ontario’s city center.
How long is the flight from Ontario to Washington, D.C. Reagan-National Airport?
Frontier and Delta can get you from Ontario to Washington, D.C. Reagan-National Airport in just under 11h 27m. Your travel time can differ by up to 47m. Ontario and Washington, D.C. Reagan-National Airport are separated by a distance of 2258 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.
What are the cheapest airlines flying from Ontario to Washington, D.C. Reagan-National Airport round-trip?
Frontier, at $147, was found to be the cheapest airline from Ontario to Washington, D.C. Reagan-National Airport.Alternate airlines to your destination round-trip include United Airlines and Southwest. You may be able to fly from Ontario to Washington, D.C. Reagan-National Airport for 60% less than the average price by searching for these airlines.
What are the cheapest airlines to fly from Ontario to Washington, D.C. Reagan-National Airport one-way?
The cheapest airline one-way is Frontier, with whom users have recently found tickets for as low as $82. However, be on the lookout for offers from United Airlines and Delta, as they are both options that can get you from Ontario to Washington, D.C. Reagan-National Airport for a low price.
Can I find deals for flights from Ontario to Reagan-National that include hotel bookings?
Yes. In addition to deals on Ontario to Reagan-National flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Ontario to Reagan-National?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ontario to Reagan-National.
Can I find deals for business class flights from Ontario to Reagan-National?
Yes. Cheapflights offers flight deals from Ontario to Reagan-National by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.
What is the cheapest month to book a flight from Ontario to Washington, D.C. Reagan-National Airport?
Currently, June is the cheapest month in which you can book a flight from Ontario to Washington, D.C. Reagan-National Airport (average of $99). Flying from Ontario to Washington, D.C. Reagan-National Airport in July is currently the most expensive (average of $228). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Alexandria

Woodbridge

Tysons

Arlington

Owings Mills

Springfield

Hanover

Silver Spring

Fredericksburg

Fairfax

Linthicum Heights

Manassas

Rockville

Laurel

Towson

National Harbor

Bowie

Largo

McLean

Clinton

Browse thousands of different options on Cheapflights for your next trip

Top 5 airlines flying from Ontario to Reagan-National

Airline	Cheapest	Average	Flexibility	On-time
Frontier	Cheapest$147	Average$290	FlexibilityNo cancel fee	On-time62%
United Airlines	Cheapest$226	Average$426	FlexibilityNo cancel fee	On-time69%
Southwest	Cheapest$258	Average$441	FlexibilityNo cancel fee	On-time63%
Delta	Cheapest$276	Average$387	FlexibilityNo cancel fee	On-timeN/A
American Airlines	Cheapest$326	Average$491	FlexibilityNo cancel fee	On-time71%

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$58+ Cheap flights from Ontario (ONT) to Reagan-National (DCA)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 1/24. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Ontario to Reagan-National with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheapflights Tip: The best prices from Ontario to Washington, D.C. Reagan-National are usually found in September or February, booked 15 days in advance, depart on a Tuesday or Wednesday and return on a Saturday

Cheap flight deals from Ontario to Reagan-National

Cheapest flights from Ontario to Reagan-NationalExplore the most affordable flight options available from Ontario to Reagan-National. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 10, 2025.

Explore the most affordable flight options available from Ontario to Reagan-National. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 10, 2025.

Find flight deals from Ontario to Reagan-National

Most accurate provider

Most trusted provider

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Cheapflights 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.

Compare providers for flights from Ontario to Reagan-National

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Ontario to Reagan-National in December.

Best time to book a flight from Ontario to Reagan-National

Have a flexible travel schedule? Discover the best time to fly to Reagan-National from Ontario with our price prediction graph.

Cheapflights Insights

Everything you need to know about your flight from Ontario to Washington, D.C. Reagan-National Airport

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

What is the cheapest month to book a flight from Ontario to Washington, D.C. Reagan-National Airport?

What is the cheapest time of day to fly from ONT to DCA?

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

Reviews of airlines servicing Reagan-National

Read through reviews of airlines operating flights from Ontario to Washington, D.C. Reagan-National Airport, such as Southwest, Delta, and United Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

Find useful and relevant information for your journey from Ontario to Reagan-National. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

What airport do you fly from for flights from Ontario to Washington, D.C. Reagan-National?

How long is the flight from Ontario to Washington, D.C. Reagan-National Airport?

What are the cheapest airlines flying from Ontario to Washington, D.C. Reagan-National Airport round-trip?

What are the cheapest airlines to fly from Ontario to Washington, D.C. Reagan-National Airport one-way?

Can I find deals for flights from Ontario to Reagan-National that include hotel bookings?

How can I find direct flights from Ontario to Reagan-National?

Can I find deals for business class flights from Ontario to Reagan-National?

What is the cheapest month to book a flight from Ontario to Washington, D.C. Reagan-National Airport?

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Alternative routes for Ontario to Reagan-National

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Top 5 airlines flying from Ontario to Reagan-National

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Cheapest flights from Ontario to Reagan-National
Explore the most affordable flight options available from Ontario to Reagan-National. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 10, 2025.