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

The cheapest airline one-way is American Airlines, with whom users have recently found tickets for as low as $84. However, be on the lookout for offers from Air Canada and Delta, as they are both options that can get you from Washington, D.C. Reagan-National Airport to Region of Ontario for a low price.

In terms of precipitation, rainfall in Region of Ontario ranges from 2.0 - 3.3 inches per month. June is typically the wettest month, when rainfall can reach 3.3 in. February is typically the driest time to visit Region of Ontario when rainfall is around 2.0 in.

If weather is an important factor for your trip to Region of Ontario, 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 69.8 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 21.2 F).

What are the most popular routes from Washington, D.C. Reagan-National Airport to Region of Ontario?

The most popular flight routes from Washington, D.C. Reagan-National Airport to Region of Ontario are Washington, D.C. Reagan-National - Toronto Pearson Intl, Washington, D.C. Reagan-National - Montreal Pierre Elliott Trudeau Intl and Washington, D.C. Reagan-National - Toronto Island.

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

The most popular airlines flying from Washington, D.C. Reagan-National Airport to Region of Ontario are American Airlines, Air Canada and Porter Airlines. Something to consider prior to booking your flight.

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

The best pricing can be found in the month of June. Prices to Region of Ontario from Washington, D.C. Reagan-National Airport average $283. You can even find prices in June for less than $283, as users have found deals to Region of Ontario from as low as $132. The month of November appears to be one of the more expensive times to travel to Region of Ontario from Washington, D.C. Reagan-National Airport. Flying in the targeted month can save you up to 12%.

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

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

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

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

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

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

$84+ Flights from Washington, D.C. Reagan-National Airport to Ontario

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

To save on the cost of your flight from Washington, D.C. Reagan-National Airport to Region of Ontario, book at least 37 days before your planned departure. Booking around this time can save you about 128% on the cost of this flight compared to booking a flight leaving this week. We have found prices from $292 if you need a flight within two weeks. For flights within the next 72 hours, you can find tickets from as low as $617.

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Cheap flight deals from Reagan-National to Ontario

Round-trip from	$192 (Flightnetwork)
One-way from	$84 (American Airlines)
Popular in	November
Cheapest in	June
Average price	$286
Good round-trip deal	$313 or less
Good one-way deal	$133 or less

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

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

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Highest demand for flights based on searches. 4% potential increase in price ($13 potential increase over avg. RT price).

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Cheapest flight prices on average. 1% potential price decrease ($3 potential savings vs. average RT price).

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Average for round-trip flights in July 2025

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Price to beat on a round-trip flight from Washington, D.C. Reagan-National to Ontario.

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Price to beat on a one-way flight from Washington, D.C. Reagan-National to Ontario.

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Find flight deals from Reagan-National to Ontario

Cheapest flights from Reagan-National to Ontario
Explore the most affordable flight options available from Reagan-National to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 29, 2025.

Wed 8/279:40 amDCA - YTZ

1 stop5h 06mAir Canada

Fri 8/295:25 pmYTZ - DCA

1 stop4h 23mAir Canada

Deal found 7/28

$198

Wed 8/276:00 amDCA - YYZ

1 stop4h 40mAir Canada

Fri 8/299:00 amYYZ - DCA

1 stop6h 48mAir Canada

Deal found 7/28

$206

Thu 9/47:00 pmDCA - YYZ

1 stop4h 58mMultiple Airlines

Sun 9/77:25 amYYZ - DCA

Nonstop1h 34mMultiple Airlines

Deal found 7/29

$263

Wed 9/109:40 amDCA - YUL

Nonstop1h 49mAir Canada

Wed 9/178:00 pmYUL - DCA

Nonstop1h 51mAir Canada

Deal found 7/27

$263

Fri 8/2212:55 pmDCA - YOW

Nonstop1h 32mAir Canada

Mon 8/2510:25 amYOW - DCA

Nonstop1h 38mAir Canada

Deal found 7/27

$309

Sat 8/302:00 pmDCA - YUL

1 stop7h 29mUnited Airlines

Sun 8/316:15 amYUL - DCA

1 stop6h 44mUnited Airlines

Deal found 7/27

$320

Tue 9/3012:30 pmDCA - YUL

1 stop5h 20mDelta

Sat 11/19:28 amYUL - DCA

1 stop6h 57mDelta

Deal found 7/26

$329

Sat 8/306:25 pmDCA - YUL

1 stop5h 03mMultiple Airlines

Sun 8/318:30 amYUL - DCA

Nonstop1h 48mMultiple Airlines

Deal found 7/29

$342

Fri 8/229:00 amDCA - YOW

1 stop13h 05mMultiple Airlines

Mon 8/2510:25 amYOW - DCA

Nonstop1h 38mMultiple Airlines

Deal found 7/27

$379

Sun 8/173:05 pmDCA - YOW

1 stop7h 00mUnited Airlines

Wed 8/206:05 amYOW - DCA

1 stop4h 23mUnited Airlines

Deal found 7/28

$416

Tue 8/2611:00 amDCA - YQT

1 stop4h 48mAir Canada

Tue 9/25:00 pmYQT - DCA

1 stop5h 34mAir Canada

Deal found 7/29

$481

Wed 9/108:40 pmDCA - YAM

1 stop14h 12mAir Canada

Wed 9/175:35 amYAM - DCA

1 stop14h 09mAir Canada

Deal found 7/27

$584

Best flights from Reagan-National to Ontario
Discover carefully curated flight deals from Reagan-National to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated July 29, 2025.

Thu 9/46:00 amDCA - YYZ

1 stop4h 39mAir Canada

Sun 9/78:00 amYYZ - DCA

1 stop4h 08mAir Canada

Deal found 7/29

$192

Sat 8/302:00 pmDCA - YUL

1 stop7h 29mUnited Airlines

Sun 8/316:15 amYUL - DCA

1 stop6h 44mUnited Airlines

Deal found 7/27

$320

Tue 9/3012:30 pmDCA - YUL

1 stop5h 20mDelta

Sat 11/19:28 amYUL - DCA

1 stop6h 57mDelta

Deal found 7/26

$329

Sat 8/306:25 pmDCA - YUL

1 stop5h 03mMultiple Airlines

Sun 8/318:30 amYUL - DCA

Nonstop1h 48mMultiple Airlines

Deal found 7/29

$342

Wed 8/279:40 amDCA - YTZ

1 stop5h 06mAir Canada

Fri 8/295:25 pmYTZ - DCA

1 stop4h 23mAir Canada

Deal found 7/28

$198

Wed 9/109:40 amDCA - YUL

Nonstop1h 49mAir Canada

Wed 9/178:00 pmYUL - DCA

Nonstop1h 51mAir Canada

Deal found 7/27

$263

Fri 9/512:55 pmDCA - YOW

Nonstop1h 31mAir Canada

Fri 9/1210:25 amYOW - DCA

Nonstop1h 43mAir Canada

Deal found 7/29

$304

Fri 8/229:00 amDCA - YOW

1 stop13h 05mMultiple Airlines

Mon 8/2510:25 amYOW - DCA

Nonstop1h 38mMultiple Airlines

Deal found 7/27

$379

Sun 8/173:05 pmDCA - YOW

1 stop7h 00mUnited Airlines

Wed 8/206:05 amYOW - DCA

1 stop4h 23mUnited Airlines

Deal found 7/28

$416

Tue 8/2611:00 amDCA - YQT

1 stop4h 48mAir Canada

Tue 9/25:00 pmYQT - DCA

1 stop5h 34mAir Canada

Deal found 7/29

$481

Wed 9/108:40 pmDCA - YAM

1 stop14h 12mAir Canada

Wed 9/175:35 amYAM - DCA

1 stop14h 09mAir Canada

Deal found 7/27

$584

Wed 9/106:00 amDCA - YQG

2 stops9h 17mMultiple Airlines

Sun 9/144:00 pmYQG - DCA

2 stops16h 58mMultiple Airlines

Deal found 7/29

$784

Last-minute flights from Reagan-National to Ontario
Discover last-minute flight deals from Reagan-National to Ontario. Data last updated July 29, 2025 and is based on user searches.

Sun 8/34:30 pmDCA - YUL

Nonstop1h 55mAir Canada

Sat 8/238:30 amYUL - DCA

Nonstop1h 48mAir Canada

Deal found 7/27

$434

Mon 8/411:10 amDCA - YTZ

2 stops7h 35mMultiple Airlines

Sun 8/245:25 pmYTZ - DCA

1 stop4h 23mMultiple Airlines

Deal found 7/27

$832

Mon 8/412:55 pmDCA - YOW

Nonstop1h 32mUnited Airlines

Mon 8/115:25 pmYOW - DCA

1 stop5h 17mUnited Airlines

Deal found 7/28

$852

Tue 8/511:00 amDCA - YUL

1 stop5h 07mDelta

Sat 9/206:00 amYUL - DCA

2 stops9h 00mDelta

Deal found 7/27

$422

Tue 8/57:00 amDCA - YUL

1 stop6h 09mUnited Airlines

Sat 9/206:00 amYUL - DCA

1 stop4h 28mUnited Airlines

Deal found 7/29

$483

Thu 8/76:59 amDCA - YYZ

Nonstop1h 34mAir Canada

Fri 8/228:55 pmYYZ - DCA

Nonstop1h 32mAir Canada

Deal found 7/27

$357

Thu 8/712:55 pmDCA - YTZ

1 stop5h 50mAir Canada

Fri 8/225:25 pmYTZ - DCA

1 stop4h 23mAir Canada

Deal found 7/27

$361

Thu 8/710:15 amDCA - YYZ

Nonstop1h 46mAmerican Airlines

Fri 8/1510:38 amYYZ - DCA

1 stop4h 21mAmerican Airlines

Deal found 7/28

$414

Fri 8/810:15 pmDCA - YUL

1 stop11h 31mAmerican Airlines

Thu 8/1412:51 pmYUL - DCA

1 stop7h 08mAmerican Airlines

Deal found 7/27

$412

Fri 8/86:05 amDCA - YYZ

1 stop8h 40mDelta

Fri 8/226:04 amYYZ - DCA

1 stop4h 10mDelta

Deal found 7/27

$420

Fri 8/811:00 amDCA - YXU

1 stop4h 02mAir Canada

Sun 8/105:55 pmYXU - DCA

1 stop4h 32mAir Canada

Deal found 7/28

$993

Fri 8/810:19 amDCA - YOW

2 stops14h 03mWestJet

Sun 8/105:55 amYOW - DCA

2 stops29h 25mWestJet

Deal found 7/29

$1,040

One-way flights from Reagan-National to Ontario
Search for one-way flight options from Reagan-National to Ontario. Find affordable one-way fares based on user searches. Data last updated July 29, 2025.

Sun 9/142:54 pmDCA - YYZ

Nonstop1h 39mAmerican Airlines

Deal found 7/29

$84

Wed 9/36:00 amDCA - YYZ

1 stop6h 39mAir Canada

Deal found 7/29

$89

Thu 9/412:55 pmDCA - YTZ

1 stop5h 50mAir Canada

Deal found 7/26

$96

Mon 8/187:45 pmDCA - YYZ

1 stop3h 58mDelta

Deal found 7/27

$107

Mon 8/251:00 pmDCA - YYZ

1 stop10h 58mUnited Airlines

Deal found 7/28

$116

Thu 9/116:00 amDCA - YUL

1 stop9h 29mAmerican Airlines

Deal found 7/29

$117

Sat 9/66:59 amDCA - YUL

1 stop4h 21mAir Canada

Deal found 7/29

$119

Mon 9/151:40 pmDCA - YUL

1 stop8h 17mDelta

Deal found 7/27

$135

Fri 9/59:00 amDCA - YUL

1 stop7h 10mUnited Airlines

Deal found 7/27

$143

Sat 8/2312:55 pmDCA - YOW

Nonstop1h 32mAir Canada

Deal found 7/27

$150

Mon 8/256:30 amDCA - YUL

2 stops18h 13mWestJet

Deal found 7/27

$166

Thu 9/117:00 amDCA - YOW

1 stop4h 45mUnited Airlines

Deal found 7/28

$171

Cheapflights 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

Washington, D.C.Toronto

DCA - YYZ

DCAYYZ

Washington, D.C. Reagan-National

Thu 9/4

6:00 am-10:39 am

1 stop4h 39m

Toronto Pearson Intl

Sun 9/7

8:00 am-12:08 pm

1 stop4h 08m

$192

Washington, D.C.Toronto

DCA - YTZ

DCAYTZ

Washington, D.C. Reagan-National

Wed 8/27

9:40 am-2:46 pm

1 stop5h 06m

Toronto Island

Fri 8/29

5:25 pm-9:48 pm

1 stop4h 23m

$198

Washington, D.C.Montreal

DCA - YUL

DCAYUL

Washington, D.C. Reagan-National

Wed 9/10

9:40 am-11:29 am

Nonstop1h 49m

Montreal Pierre Elliott Trudeau Intl

Wed 9/17

8:00 pm-9:51 pm

Nonstop1h 51m

$263

Washington, D.C.Ottawa

DCA - YOW

DCAYOW

Washington, D.C. Reagan-National

Fri 9/5

12:55 pm-2:26 pm

Nonstop1h 31m

Ottawa

Fri 9/12

10:25 am-12:08 pm

Nonstop1h 43m

$304

Washington, D.C.Montreal

DCA - YUL

DCAYUL

Washington, D.C. Reagan-National

Sat 8/30

2:00 pm-9:29 pm

1 stop7h 29m

Montreal Pierre Elliott Trudeau Intl

Sun 8/31

6:15 am-12:59 pm

1 stop6h 44m

$320

Washington, D.C.Montreal

DCA - YUL

DCAYUL

Washington, D.C. Reagan-National

Tue 9/30

12:30 pm-5:50 pm

1 stop5h 20m

Montreal Pierre Elliott Trudeau Intl

Sat 11/1

9:28 am-4:25 pm

1 stop6h 57m

$329

Washington, D.C.Montreal

DCA - YUL

DCAYUL

Washington, D.C. Reagan-National

Sat 8/30

6:25 pm-11:28 pm

1 stop5h 03m

Montreal Pierre Elliott Trudeau Intl

Sun 8/31

8:30 am-10:18 am

Nonstop1h 48m

$342

Washington, D.C.Ottawa

DCA - YOW

DCAYOW

Washington, D.C. Reagan-National

Fri 8/22

9:00 am-10:05 pm

1 stop13h 05m

Ottawa

Mon 8/25

10:25 am-12:03 pm

Nonstop1h 38m

$379

Washington, D.C.Ottawa

DCA - YOW

DCAYOW

Washington, D.C. Reagan-National

Sun 8/17

3:05 pm-10:05 pm

1 stop7h 00m

Ottawa

Wed 8/20

6:05 am-10:28 am

1 stop4h 23m

$416

Washington, D.C.Thunder Bay

DCA - YQT

DCAYQT

Washington, D.C. Reagan-National

Tue 8/26

11:00 am-3:48 pm

1 stop4h 48m

Thunder Bay

Tue 9/2

5:00 pm-10:34 pm

1 stop5h 34m

$481

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/29

Showing 1-10 of 41 results

...

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

Have a flexible travel schedule? Discover the best time to fly to Ontario from Reagan-National 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 Washington, D.C. Reagan-National Airport to Ontario

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

Currently, January is the cheapest month in which you can book a flight from Washington, D.C. Reagan-National Airport to Region of Ontario (average of $243). Flying from Washington, D.C. Reagan-National Airport to Region of Ontario in August is currently the most expensive (average of $348). 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 DCA to ON?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Washington, D.C. Reagan-National Airport to Region of Ontario as you normally would.

Weekly flight availability from Washington, D.C. Reagan-National Airport to Region of Ontario

The most flights from DCA to CAON are scheduled on a Monday (9 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (7 on average).

Reviews of airlines servicing Ontario

Peruse reviews from past customers who have flown with Delta, United Airlines, and American Airlines from Washington, D.C. Reagan-National Airport to Ontario to help guide your decision. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Delta

8.0

Very good

7,977 reviews

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Delta

8.0

Very good

7,977 reviews

Delta

8.0

Very good

7,977 reviews

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

United Airlines

7.4

Good

8,899 reviews

Delta

8.0

Very good

7,977 reviews

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

American Airlines

7.2

Good

10,000 reviews

Delta

8.0

Very good

7,977 reviews

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

WestJet

7.2

Good

2,973 reviews

Delta

8.0

Very good

7,977 reviews

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Air Canada

7.1

Good

9,822 reviews

Delta

8.0

Very good

7,977 reviews

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Related info for your journey

What are the cheapest airlines to fly from Washington, D.C. Reagan-National Airport to Region of Ontario one-way?
The cheapest airline one-way is American Airlines, with whom users have recently found tickets for as low as $84. However, be on the lookout for offers from Air Canada and Delta, as they are both options that can get you from Washington, D.C. Reagan-National Airport to Region of Ontario for a low price.
What are the most popular routes from Washington, D.C. Reagan-National Airport to Region of Ontario?
The most popular flight routes from Washington, D.C. Reagan-National Airport to Region of Ontario are Washington, D.C. Reagan-National - Toronto Pearson Intl, Washington, D.C. Reagan-National - Montreal Pierre Elliott Trudeau Intl and Washington, D.C. Reagan-National - Toronto Island.
What are the most reliable airlines from Washington, D.C. Reagan-National Airport to Region of Ontario?
Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from Washington, D.C. Reagan-National Airport to Region of Ontario on time: American Airlines (67%), PSA Airlines (67%), Air Canada (67%).
What are the cheapest flights from Washington, D.C. Reagan-National Airport to Region of Ontario?
Looking for the cheapest flight from Washington, D.C. Reagan-National Airport to Region of Ontario? While on average our users pay $2,037, our data indicates the cheapest price to be $80. The most popular route (Washington, D.C. Reagan-National - Toronto Pearson Intl), is priced around $234.
Can I find deals for flights from Reagan-National to Ontario that include hotel bookings?
Yes. In addition to deals on Reagan-National to Ontario flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Reagan-National to Ontario?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Reagan-National to Ontario.
Can I find deals for business class flights from Reagan-National to Ontario?
Yes. Cheapflights offers flight deals from Reagan-National to Ontario 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 Washington, D.C. Reagan-National Airport to Region of Ontario?
Currently, January is the cheapest month in which you can book a flight from Washington, D.C. Reagan-National Airport to Region of Ontario (average of $243). Flying from Washington, D.C. Reagan-National Airport to Region of Ontario in August is currently the most expensive (average of $348). 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

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Alternative routes for Reagan-National to Ontario

Dulles Intl to Pearson Intl flights

Reagan-National to Pearson Intl flights

Reagan-National to Pierre Elliott Trudeau Intl flights

Dulles Intl to Toronto Island flights

Dulles Intl to Pierre Elliott Trudeau Intl flights

Baltimore to Pearson Intl flights

Dulles Intl to Vancouver Intl flights

Dulles Intl to Calgary flights

Reagan-National to Vancouver Intl flights

Baltimore to Pierre Elliott Trudeau Intl flights

Baltimore to Vancouver Intl flights

Baltimore to Calgary flights

Dulles Intl to Halifax flights

Reagan-National to Toronto Island flights

Dulles Intl to St. John's flights

Reagan-National to Calgary flights

Reagan-National to St. John's flights

Baltimore to St. John's flights

Baltimore to Toronto Island flights

Reagan-National to Halifax flights

Dulles Intl to Québec City flights

Reagan-National to Québec City flights

Baltimore to Halifax flights

Dulles Intl to Abbotsford flights

Dulles Intl to Ottawa flights

Baltimore to Québec City flights

Dulles Intl to Edmonton flights

Baltimore to Abbotsford flights

Reagan-National to Ottawa flights

Dulles Intl to Winnipeg flights

Baltimore to Edmonton flights

Dulles Intl to Hamilton flights

Baltimore to Winnipeg flights

Reagan-National to Edmonton flights

Reagan-National to Abbotsford flights

Baltimore to Ottawa flights

Dulles Intl to Victoria flights

Dulles Intl to Saskatoon flights

Reagan-National to Winnipeg flights

Baltimore to Victoria flights

Reagan-National to Charlottetown flights

Dulles Intl to Charlottetown flights

Baltimore to Saskatoon flights

Baltimore to Charlottetown flights

Reagan-National to Saskatoon flights

Reagan-National to Victoria flights

Dulles Intl to Kelowna flights

Dulles Intl to Nanaimo flights

Dulles Intl to Moncton flights

Complete your trip

Region of Ontario car rentals

Toronto Pearson Intl Airport car rentals

Ottawa Airport car rentals

Toronto Island Airport car rentals

Hamilton Airport car rentals

London Airport car rentals

Toronto Region of Waterloo Intl Airport car rentals

Thunder Bay Airport car rentals

Sault Ste Marie Airport car rentals

Kingston Airport car rentals

Timmins Airport car rentals

North Bay Airport car rentals

Top 4 airlines flying from Reagan-National to Ontario

Airline	Cheapest	Average	Flexibility	On-time
Porter Airlines	Cheapest$103	Average$399	FlexibilityNo cancel fee	On-time52%
Air Canada	Cheapest$118	Average$375	FlexibilityNo cancel fee	On-time67%
United Airlines	Cheapest$132	Average$424	FlexibilityNo cancel fee	On-time69%
American Airlines	Cheapest$220	Average$372	FlexibilityNo cancel fee	On-time71%

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$84+ Cheap flights from Reagan-National (DCA) to Ontario

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 9/14. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Reagan-National to Ontario with Cheapflights

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Cheap flight deals from Reagan-National to Ontario

Keep the following information in mind while searching for Reagan-National to Ontario flight deals. Data was last updated July 29, 2025.

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Good round-trip deal

Good one-way deal

Find flight deals from Reagan-National to Ontario

Cheapest flights from Reagan-National to OntarioExplore the most affordable flight options available from Reagan-National to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 29, 2025.

Explore the most affordable flight options available from Reagan-National to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 29, 2025.

Cheapflights 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.

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

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

Cheapflights Insights

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

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

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

Find hourly flight availability from Reagan-National to Ontario. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated July 29, 2025.

Weekly flight availability from Washington, D.C. Reagan-National Airport to Region of Ontario

Reviews of airlines servicing Ontario

Related info for your journey

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

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

What are the most popular routes from Washington, D.C. Reagan-National Airport to Region of Ontario?

What are the most reliable airlines from Washington, D.C. Reagan-National Airport to Region of Ontario?

What are the cheapest flights from Washington, D.C. Reagan-National Airport to Region of Ontario?

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

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

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

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

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Alternative routes for Reagan-National to Ontario

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Top 4 airlines flying from Reagan-National to Ontario

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Cheapest flights from Reagan-National to Ontario
Explore the most affordable flight options available from Reagan-National to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 29, 2025.