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

Frontier, at $241, was found to be the cheapest airline from Ontario to Washington, D.C. Reagan-National Airport. An alternate airline flying to your destination would be Delta. You may be able to fly from Ontario to Washington, D.C. Reagan-National Airport for 37% less than the average price by searching for these airlines.

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: American Airlines, Delta or Frontier.

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

It’s generally more expensive to depart on a Monday, if you have to leave on this day you can still search on Cheapflights to find great options that meet your needs.

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

Flights from Ontario to Washington, D.C. Reagan-National Airport lean towards being more expensive in December. Prices are generally better when you fly from Ontario to Washington, D.C. Reagan-National Airport in August, with the cheapest ticket starting at $131.

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.

$104+ Flights from Ontario to Washington, D.C. Reagan-National Airport

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

To save on the cost of your flight from Ontario to Washington, D.C. Reagan-National Airport, book at least 58 days before your planned departure. Booking around this time can save you about 88% on the cost of this flight compared to booking a flight leaving this week. We have found prices from $377 if you need a flight within two weeks. For flights within the next 72 hours, you can find tickets from as low as $635.

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Cheapflights Tip: The best prices from Ontario to Washington, D.C. Reagan-National are usually found in February or September, booked 29 days in advance, depart on a Tuesday or Wednesday and return on a Saturday

Cheap flight deals from Ontario to Reagan-National

Round-trip from	$241 (Trip.com)
One-way from	$104 (Mytrip)
Popular in	December
Cheapest in	February
Average price	$388

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

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

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Highest demand for flights based on searches. 12% potential increase in price ($54 potential increase over avg. RT price).

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

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Average for round-trip flights in July 2025

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Find 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 July 2, 2025.

Mon 7/2112:59 amONT - DCA

1 stop8h 05mFrontier

Wed 8/137:00 amDCA - ONT

1 stop19h 50mFrontier

Deal found 7/2

$241

Thu 8/1411:45 amONT - DCA

1 stop9h 01mDelta

Tue 8/196:00 amDCA - ONT

1 stop7h 35mDelta

Deal found 7/1

$299

Tue 8/56:45 amONT - DCA

1 stop9h 10mSouthwest

Mon 8/114:40 pmDCA - ONT

2 stops8h 20mSouthwest

Deal found 7/2

$304

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 July 2, 2025.

Mon 7/2112:59 amONT - DCA

1 stop8h 05mFrontier

Wed 8/137:00 amDCA - ONT

1 stop19h 50mFrontier

Deal found 7/2

$241

Tue 8/57:05 amONT - DCA

1 stop7h 09mDelta

Thu 8/146:00 amDCA - ONT

1 stop7h 35mDelta

Deal found 6/29

$299

Last-minute flights from Ontario to Reagan-National
Discover last-minute flight deals from Ontario to Reagan-National. Data last updated July 2, 2025 and is based on user searches.

Wed 7/912:59 amONT - DCA

1 stop8h 05mFrontier

Mon 7/146:00 pmDCA - ONT

1 stop8h 50mFrontier

Deal found 7/2

$247

Mon 7/2112:59 amONT - DCA

1 stop8h 05mFrontier

Wed 8/137:00 amDCA - ONT

1 stop19h 50mFrontier

Deal found 7/2

$241

Tue 8/57:05 amONT - DCA

1 stop7h 09mDelta

Thu 8/146:00 amDCA - ONT

1 stop7h 35mDelta

Deal found 6/29

$299

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 July 2, 2025.

Fri 8/2212:59 amONT - DCA

1 stop8h 12mFrontier

Deal found 6/30

$104

Thu 8/1411:45 amONT - DCA

1 stop7h 03mDelta

Deal found 7/1

$150

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

Mon 7/21

12:59 am-12:04 pm

1 stop8h 05m

Washington, D.C. Reagan-National

Wed 8/13

7:00 am-11:50 pm

1 stop19h 50m

$241

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Thu 8/14

11:45 am-11:46 pm

1 stop9h 01m

Washington, D.C. Reagan-National

Mon 8/18

5:20 pm-11:40 pm

1 stop9h 20m

$299

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Tue 8/5

11:55 am-11:10 pm

1 stop8h 15m

Washington, D.C. Reagan-National

Mon 8/11

4:40 pm-10:00 pm

2 stops8h 20m

$304

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Fri 8/15

12:59 am-12:04 pm

1 stop8h 05m

$108

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Thu 8/14

11:45 am-9:48 pm

1 stop7h 03m

$150

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Wed 10/22

1:00 pm-12:59 am

2 stops8h 59m

$164

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/2

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 29 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, February is the cheapest month in which you can book a flight from Ontario to Washington, D.C. Reagan-National Airport (average of $278). Flying from Ontario to Washington, D.C. Reagan-National Airport in March is currently the most expensive (average of $335). 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 48% 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 Wednesday evenings when fares are most often at their lowest. Monday at noon 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 Delta and Frontier. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

Delta

8.0

Very good

7,975 reviews

Reviews

1 / 20

10.0

Excellent

Michael,Sep 2023

SMF - ATL

Not sufficient leg room and three seats are very tigh.t on 737 in economy main cabin

Delta

8.0

Very good

7,975 reviews

Delta

8.0

Very good

7,975 reviews

Reviews

1 / 20

10.0

Excellent

Michael,Sep 2023

SMF - ATL

Not sufficient leg room and three seats are very tigh.t on 737 in economy main cabin

Frontier

5.9

Fair

3,286 reviews

Delta

8.0

Very good

7,975 reviews

Reviews

1 / 20

10.0

Excellent

Michael,Sep 2023

SMF - ATL

Not sufficient leg room and three seats are very tigh.t on 737 in economy main cabin

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.
What are the cheapest airlines flying from Ontario to Washington, D.C. Reagan-National Airport round-trip?
Frontier, at $241, was found to be the cheapest airline from Ontario to Washington, D.C. Reagan-National Airport. An alternate airline flying to your destination would be Delta. You may be able to fly from Ontario to Washington, D.C. Reagan-National Airport for 37% less than the average price by searching for these airlines.
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, February is the cheapest month in which you can book a flight from Ontario to Washington, D.C. Reagan-National Airport (average of $278). Flying from Ontario to Washington, D.C. Reagan-National Airport in March is currently the most expensive (average of $335). 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

Arlington

Woodbridge

Alexandria

Tysons

Silver Spring

Fredericksburg

Linthicum Heights

Gaithersburg

Fairfax

Easton

Towson

Waldorf

Laurel

Falls Church

Rockville

Springfield

National Harbor

Manassas

Dundalk

Bowie

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$146	Average$297	FlexibilityNo cancel fee	On-time62%
Delta	Cheapest$286	Average$433	FlexibilityNo cancel fee	On-timeN/A
American Airlines	Cheapest$316	Average$534	FlexibilityNo cancel fee	On-time71%
United Airlines	Cheapest$322	Average$444	FlexibilityNo cancel fee	On-time69%
Southwest	Cheapest$326	Average$468	FlexibilityNo cancel fee	On-time63%

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$104+ 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 8/22. 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 February or September, booked 29 days in advance, depart on a Tuesday or Wednesday and return on a Saturday

Cheap flight deals from Ontario to Reagan-National

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Find 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 July 2, 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 July 2, 2025.

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.

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?

Use this chart to determine the optimal time to book a round-trip flight from Ontario to Reagan-National. Price data was last updated on June 27, 2025.

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?

Find hourly flight availability from Ontario to Reagan-National. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated July 2, 2025.

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

Use this chart to determine the cheapest time to fly round-trip from Ontario to Reagan-National. Price data was last updated on December 16, 2024.

Reviews of airlines servicing Reagan-National

Read through reviews of airlines operating flights from Ontario to Washington, D.C. Reagan-National Airport, such as Delta and Frontier. 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?

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

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 July 2, 2025.