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

Frontier, at $172, was found to be the cheapest airline from Ontario to Washington, D.C. Reagan-National Airport.Alternate airlines to your destination round-trip include Delta and United Airlines. You may be able to fly from Ontario to Washington, D.C. Reagan-National Airport for 61% 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 $89. However, be on the lookout for offers from United Airlines and Southwest, 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: Southwest, Frontier or American Airlines.

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 decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Most accurate provider : When it comes to deals on Ontario-Washington, D.C. Reagan-National Airport flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Ontario-Washington, D.C. Reagan-National Airport flight deals on Cheapflights vs. FlightHub >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 FlightHub the most. FlightHub 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.

$124+ Cheap Flights from Ontario to Washington, D.C. Reagan-National Airport

Home Search by date Vacation packages Hotels Flight deals Car rental Travel tips & news

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.

Cheap flight deals from Ontario to Reagan-National

Cheapest

Best

Last-minute

One-way

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 November 4, 2026.

Tue 12/86:00 am -

1 stop12h 59m

Sat 12/126:00 pm -

1 stop19h 45m

Deal found 11/2

$250

Thu 12/311:30 am -

1 stop7h 25m

Fri 12/46:00 pm -

1 stop9h 17m

Deal found 11/2

$252

Thu 11/266:45 am -

1 stop12h 10m

Thu 12/31:33 pm -

1 stop13h 44m

Deal found 11/1

$253

Tue 12/16:00 am -

1 stop27h 48m

Thu 12/36:00 pm -

1 stop9h 17m

Deal found 11/4

$258

Fri 12/411:30 am -

1 stop7h 25m

Mon 12/76:00 pm -

1 stop9h 20m

Deal found 11/2

$259

Wed 11/2511:40 am -

1 stop22h 19m

Thu 12/36:00 pm -

1 stop9h 17m

Deal found 11/3

$261

Thu 12/36:00 am -

1 stop7h 52m

Tue 12/87:00 am -

1 stop18h 17m

Deal found 11/3

$264

Tue 12/16:00 am -

1 stop27h 48m

Fri 12/46:00 pm -

1 stop9h 17m

Deal found 11/2

$265

Wed 12/211:30 am -

1 stop7h 25m

Mon 12/76:00 pm -

1 stop19h 45m

Deal found 11/2

$266

Wed 11/2511:40 am -

1 stop22h 19m

Wed 12/27:00 am -

1 stop18h 20m

Deal found 11/4

$267

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 November 4, 2026.

Mon 2/16:30 am -

1 stop7h 00m

Fri 2/52:50 pm -

2 stops11h 05m

Deal found 10/31

$356

Tue 11/249:25 am -

1 stop10h 05m

Tue 12/14:30 pm -

1 stop8h 29m

Deal found 11/1

$433

Tue 12/157:05 am -

1 stop7h 15m

Sat 1/26:55 pm -

1 stop7h 45m

Deal found 11/1

$475

Fri 12/115:36 pm -

2 stops24h 24m

Sun 12/135:05 pm -

1 stop21h 08m

Deal found 11/4

$479

Tue 12/86:35 am -

2 stops10h 40m

Tue 12/156:10 am -

2 stops8h 45m

Deal found 10/30

$361

Tue 12/155:45 am -

1 stop8h 00m

Tue 12/156:50 pm -

2 stops16h 25m

Deal found 10/30

$362

Wed 1/1311:30 am -

2 stops8h 30m

Sun 1/176:20 am -

2 stops9h 50m

Deal found 11/2

$396

Thu 11/267:05 am -

1 stop9h 25m

Tue 12/296:55 pm -

1 stop7h 45m

Deal found 10/30

$485

Thu 12/178:45 pm -

2 stops8h 40m

Sat 1/1611:00 am -

2 stops10h 55m

Deal found 11/3

$470

Last-minute flights from Ontario to Reagan-National
Discover last-minute flight deals from Ontario to Reagan-National. Data last updated November 4, 2026 and is based on user searches.

Wed 11/2511:40 am -

1 stop22h 19m

Thu 12/36:00 pm -

1 stop9h 17m

Deal found 11/3

$261

Wed 11/2511:40 am -

1 stop22h 19m

Wed 12/27:00 am -

1 stop18h 20m

Deal found 11/4

$267

Thu 11/266:45 am -

1 stop12h 10m

Thu 12/31:33 pm -

1 stop13h 44m

Deal found 11/1

$253

Tue 12/16:00 am -

1 stop27h 48m

Thu 12/36:00 pm -

1 stop9h 17m

Deal found 11/4

$258

Tue 12/16:00 am -

1 stop27h 48m

Fri 12/46:00 pm -

1 stop9h 17m

Deal found 11/2

$265

Wed 12/211:30 am -

1 stop7h 25m

Mon 12/76:00 pm -

1 stop19h 45m

Deal found 11/2

$266

Thu 12/311:30 am -

1 stop7h 25m

Fri 12/46:00 pm -

1 stop9h 17m

Deal found 11/1

$252

Thu 12/36:00 am -

1 stop7h 52m

Tue 12/87:00 am -

1 stop18h 17m

Deal found 11/3

$264

Fri 12/411:30 am -

1 stop7h 25m

Mon 12/76:00 pm -

1 stop9h 20m

Deal found 11/2

$259

Tue 12/86:00 am -

1 stop12h 59m

Sat 12/126:00 pm -

1 stop19h 45m

Deal found 11/2

$250

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 November 4, 2026.

Thu 11/2611:40 am -

1 stop7h 15m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 11/2

$124

Wed 12/211:30 am -

1 stop7h 25m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 11/1

$126

Mon 12/76:00 am -

1 stop7h 55m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 10/31

$127

Wed 12/236:30 am -

1 stop26h 55m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 11/3

$129

Wed 11/256:45 am -

1 stop27h 14m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 11/1

$130

Tue 11/246:45 am -

1 stop12h 10m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 11/3

$132

Sun 12/66:00 am -

1 stop7h 55m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 10/31

$148

Sun 12/136:00 am -

1 stop7h 55m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 11/3

$149

Find flight deals from Ontario to Reagan-National

Most accurate provider	FlightHub 3 stars
Most trusted provider	FlightHub 3 stars
Round-trip from	$250 (Cheapflightsfares)
One-way from	$124 (Super.com)
Popular in	July
Cheapest in	January
Average price	$514

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. 14% potential increase in price ($73 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 1% potential price decrease ($9 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in November 2026

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

Cheapest round-trip

OntarioWashington, D.C.

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

ONTDCA

Ontario

Fri 11/27

6:45 am-9:55 pm

1 stop12h 10m

Washington, D.C. Reagan-National

Wed 12/31

12:00 am-9:00 pm

Nonstop0h 00m

$193

OntarioWashington, D.C.

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

ONTDCA

Ontario

Tue 11/17

8:40 am-8:15 pm

2 stops8h 35m

Washington, D.C. Reagan-National

Wed 12/31

12:00 am-9:00 pm

Nonstop0h 00m

$232

OntarioWashington, D.C.

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

ONTDCA

Ontario

Fri 11/20

12:18 pm-11:46 pm

1 stop8h 28m

Washington, D.C. Reagan-National

Wed 12/31

12:00 am-9:00 pm

Nonstop0h 00m

$250

OntarioWashington, D.C.

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

ONTDCA

Ontario

Thu 12/31

5:55 am-5:55 pm

2 stops9h 00m

Washington, D.C. Reagan-National

Wed 12/31

12:00 am-9:00 pm

Nonstop0h 00m

$255

Quickest round-trip

OntarioWashington, D.C.

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

ONTDCA

Ontario

Thu 3/25

5:00 am-3:03 pm

1 stop7h 03m

Washington, D.C. Reagan-National

Wed 12/31

12:00 am-9:00 pm

Nonstop0h 00m

$279

OntarioWashington, D.C.

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

ONTDCA

Ontario

Mon 11/30

11:10 pm-9:15 am

1 stop7h 05m

Washington, D.C. Reagan-National

Wed 12/31

12:00 am-9:00 pm

Nonstop0h 00m

$290

OntarioWashington, D.C.

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

ONTDCA

Ontario

Tue 11/24

7:00 am-6:15 pm

1 stop8h 15m

Washington, D.C. Reagan-National

Wed 12/31

12:00 am-9:00 pm

Nonstop0h 00m

$292

OntarioWashington, D.C.

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

ONTDCA

Ontario

Tue 12/8

5:36 pm-8:00 pm

2 stops23h 24m

Washington, D.C. Reagan-National

Wed 12/31

12:00 am-9:00 pm

Nonstop0h 00m

$295

OntarioWashington, D.C.

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

ONTDCA

Ontario

Tue 11/10

6:00 am-4:47 pm

1 stop7h 47m

Washington, D.C. Reagan-National

Wed 12/31

12:00 am-9:00 pm

Nonstop0h 00m

$304

OntarioWashington, D.C.

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

ONTDCA

Ontario

Wed 11/11

12:18 pm-10:45 pm

1 stop7h 27m

Washington, D.C. Reagan-National

Wed 12/31

12:00 am-9:00 pm

Nonstop0h 00m

$307

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/30

Showing 1-10 of 20 resultsSorted by cheapest first

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 November.

Provider	Price Accuracy	Trust Score*
Expedia	Price Accuracy1 star	Trust Score*3 stars
FlightHub	Price Accuracy3 stars	Trust Score*3 stars
eDreams	Price Accuracy2 stars	Trust Score*3 stars
JustAirTicket	Price Accuracy-	Trust Score*1 star

*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 FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Ontario-Washington, D.C. Reagan-National Airport flight deals on Cheapflights vs. FlightHub >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 FlightHub the most. FlightHub 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.

ONT-DCA

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 17 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, January is the cheapest month in which you can book a flight from Ontario to Washington, D.C. Reagan-National Airport (average of $265). Flying from Ontario to Washington, D.C. Reagan-National Airport in July is currently the most expensive (average of $531). 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.

How much does it cost to fly round-trip from Ontario to Washington, D.C. Reagan-National Airport?

Airfare is below average for this route at the moment.

Ontario to Washington, D.C. Reagan-National Airport flights typically cost between $389 and $594 in December.
The cheapest round-trip price found within the last 5 days was $250 on Frontier (Dec 8-Dec 12).

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, andUnited Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

Southwest

8.0

Very good

4,212 reviews

Reviews

1 / 20

8.0

Excellent

La Tracimeldamarcos,Jun 2026

LAX - SLC

The second flight was not as comfortable as the first as we had to change planes to what seemed to be a slightly older aircraft. The seats weren’t as comfortable as the other plane. But it wasn’t bad.

Southwest

8.0

Very good

4,212 reviews

Southwest

8.0

Very good

4,212 reviews

Reviews

1 / 20

8.0

Excellent

La Tracimeldamarcos,Jun 2026

LAX - SLC

Delta

7.8

Good

8,697 reviews

Southwest

8.0

Very good

4,212 reviews

Reviews

1 / 20

8.0

Excellent

La Tracimeldamarcos,Jun 2026

LAX - SLC

United Airlines

7.3

Good

10,461 reviews

Southwest

8.0

Very good

4,212 reviews

Reviews

1 / 20

8.0

Excellent

La Tracimeldamarcos,Jun 2026

LAX - SLC

American Airlines

7.0

Good

12,231 reviews

Southwest

8.0

Very good

4,212 reviews

Reviews

1 / 20

8.0

Excellent

La Tracimeldamarcos,Jun 2026

LAX - SLC

Frontier

5.5

Fair

2,511 reviews

Southwest

8.0

Very good

4,212 reviews

Reviews

1 / 20

8.0

Excellent

La Tracimeldamarcos,Jun 2026

LAX - SLC

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?
Southwest can get you from Ontario to Washington, D.C. Reagan-National Airport in just under 7h. Your travel time can differ by up to . Ontario and Washington, D.C. Reagan-National Airport are separated by a distance of 2258 mi.
What are the cheapest airlines flying from Ontario to Washington, D.C. Reagan-National Airport round-trip?
Frontier, at $172, was found to be the cheapest airline from Ontario to Washington, D.C. Reagan-National Airport.Alternate airlines to your destination round-trip include Delta and United Airlines. You may be able to fly from Ontario to Washington, D.C. Reagan-National Airport for 61% 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 $89. However, be on the lookout for offers from United Airlines and Southwest, 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, January is the cheapest month in which you can book a flight from Ontario to Washington, D.C. Reagan-National Airport (average of $265). Flying from Ontario to Washington, D.C. Reagan-National Airport in July is currently the most expensive (average of $531). 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

Arlington

Lanham

Reston

Herndon

Hyattsville

Springfield

Fredericksburg

Falls Church

Towson

Silver Spring

Rockville

Oxon Hill

Laurel

Clinton

Hunt Valley

Owings Mills

Waldorf

Colonial Beach

Browse thousands of different options on Cheapflights for your next trip

Alternative routes

Complete your trip

Flights by cabin class

Other flight options

Other flights from Ontario

Popular flights

Reagan-National flight routes

Alternative routes for Ontario to Reagan-National

Los Angeles to Dulles Intl flights

Los Angeles to Reagan-National flights

Los Angeles to Baltimore flights

San Francisco to Dulles Intl flights

San Francisco to Reagan-National flights

San Francisco to Baltimore flights

San Diego to Dulles Intl flights

Ontario to Dulles Intl flights

Sacramento to Dulles Intl flights

San Diego to Reagan-National flights

Santa Ana to Dulles Intl flights

Ontario to Baltimore flights

San Diego to Baltimore flights

Fresno to Dulles Intl flights

Fresno to Reagan-National flights

Bakersfield to Reagan-National flights

Fresno to Baltimore flights

Las Vegas to Dulles Intl flights

Bakersfield to Dulles Intl flights

Bakersfield to Baltimore flights

Long Beach to Dulles Intl flights

Sacramento to Baltimore flights

Burbank to Dulles Intl flights

Las Vegas to Reagan-National flights

Las Vegas to Baltimore flights

San Jose to Dulles Intl flights

Sacramento to Reagan-National flights

Santa Ana to Reagan-National flights

Burbank to Baltimore flights

Oakland to Baltimore flights

Long Beach to Baltimore flights

Santa Ana to Baltimore flights

Oakland to Dulles Intl flights

San Jose to Reagan-National flights

Long Beach to Reagan-National flights

Burbank to Reagan-National flights

Oakland to Reagan-National flights

San Jose to Baltimore flights

Santa Barbara to Dulles Intl flights

Reno to Dulles Intl flights

Palm Springs to Dulles Intl flights

Santa Barbara to Baltimore flights

Reno to Reagan-National flights

San Luis Obispo to Reagan-National flights

San Luis Obispo to Dulles Intl flights

Reno to Baltimore flights

Monterey to Baltimore flights

Top 5 airlines flying from Ontario to Reagan-National

Airline	Cheapest	Average	Flexibility	On-time
Frontier	Cheapest$172	Average$365	FlexibilityNo cancel fee	On-time62%
Delta	Cheapest$208	Average$494	FlexibilityNo cancel fee	On-timeN/A
United Airlines	Cheapest$310	Average$476	FlexibilityNo cancel fee	On-time69%
Southwest	Cheapest$346	Average$510	FlexibilityNo cancel fee	On-time63%
American Airlines	Cheapest$356	Average$601	FlexibilityNo cancel fee	On-time71%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.

$124+ Cheap flights from Ontario (ONT) to Reagan-National (DCA)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 11/26. 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

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 November 4, 2026.

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 November 4, 2026.

Best flights from Ontario to Reagan-NationalDiscover 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 November 4, 2026.

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 November 4, 2026.

Last-minute flights from Ontario to Reagan-NationalDiscover last-minute flight deals from Ontario to Reagan-National. Data last updated November 4, 2026 and is based on user searches.

Discover last-minute flight deals from Ontario to Reagan-National. Data last updated November 4, 2026 and is based on user searches.

One-way flights from Ontario to Reagan-NationalSearch for one-way flight options from Ontario to Reagan-National. Find affordable one-way fares based on user searches. Data last updated November 4, 2026.

Search for one-way flight options from Ontario to Reagan-National. Find affordable one-way fares based on user searches. Data last updated November 4, 2026.

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 November.

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

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

Booking 17 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?

How much does it cost to fly round-trip from Ontario to Washington, D.C. Reagan-National Airport?

Airfare is below average for this route at the moment.

Ontario to Washington, D.C. Reagan-National Airport flights typically cost between $389 and $594 in December.The cheapest round-trip price found within the last 5 days was $250 on Frontier (Dec 8-Dec 12).

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, andUnited Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

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?

Traveling to a place near Washington, D.C. Reagan-National Airport?

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Ontario to Reagan-National

See prices for flight routes from nearby airports that may be better suited for you.

Complete your trip

Complete your trip to Reagan-National by adding a car rental and/or hotel reservation to your travel itinerary.

Search flights from Ontario to Reagan-National by cabin class

Find flights from Ontario to Reagan-National, based on your preferred cabin class, be it economy, premium economy, business, or first class.

Ontario and Reagan-National flights

Browse other Ontario and Reagan-National flight options. Last updated on November 4, 2026.

Other flights from Ontario

Browse through other flights departing from Ontario. Flights are based on user searches made on Cheapflights and were last updated on November 4, 2026.

Popular flight searches

Check out other popular destinations found by fellow travelers in 2026

Other flights to Reagan-National

Explore flights to Reagan-National departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on November 4, 2026.

Top 5 airlines flying from Ontario to Reagan-National

100% Free

Book with Flexibility

Travel Smart

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 November 4, 2026.

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 November 4, 2026.

Last-minute flights from Ontario to Reagan-National
Discover last-minute flight deals from Ontario to Reagan-National. Data last updated November 4, 2026 and is based on user searches.

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 November 4, 2026.

Ontario to Washington, D.C. Reagan-National Airport flights typically cost between $389 and $594 in December.
The cheapest round-trip price found within the last 5 days was $250 on Frontier (Dec 8-Dec 12).