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 Delta and United Airlines. You may be able to fly from Ontario to Washington, D.C. Reagan-National Airport for 62% 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 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: Frontier, American Airlines or Southwest.

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 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.

$67+ 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.

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Cheap flight deals from Ontario to Reagan-National

Most accurate provider	CheapOair 3 stars
Most trusted provider	CheapOair 3 stars
Round-trip from	$134 (Trip.com)
One-way from	$67 (Trip.com)
Popular in	January
Cheapest in	September
Average price	$694

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. 15% potential increase in price ($72 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 7% potential price decrease ($28 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in January 2026

Search Deals

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 enero 8, 2026.

jue. 1/296:20 amONT - DCA

1 stop12h 39mFrontier

mié. 2/48:59 amDCA - ONT

1 stop9h 08mFrontier

Deal found 1/8

$134

mar. 2/108:36 amONT - DCA

1 stop10h 23mFrontier

sáb. 2/146:00 pmDCA - ONT

1 stop8h 59mFrontier

Deal found 1/8

$139

dom. 1/256:20 amONT - DCA

1 stop12h 39mFrontier

mié. 1/288:59 amDCA - ONT

1 stop9h 08mFrontier

Deal found 1/7

$141

lun. 1/266:20 amONT - DCA

1 stop7h 39mFrontier

lun. 2/26:00 pmDCA - ONT

1 stop9h 20mFrontier

Deal found 1/6

$144

mar. 2/37:15 amONT - DCA

1 stop11h 44mFrontier

sáb. 2/76:00 pmDCA - ONT

1 stop8h 24mFrontier

Deal found 1/6

$145

sáb. 1/317:15 amONT - DCA

1 stop6h 44mFrontier

dom. 2/86:00 pmDCA - ONT

1 stop9h 20mFrontier

Deal found 1/6

$146

vie. 1/236:20 amONT - DCA

1 stop12h 39mFrontier

dom. 1/256:00 pmDCA - ONT

1 stop9h 20mFrontier

Deal found 1/7

$147

sáb. 1/317:15 amONT - DCA

1 stop6h 44mFrontier

sáb. 2/76:00 pmDCA - ONT

1 stop8h 24mFrontier

Deal found 1/6

$148

mié. 2/118:10 amONT - DCA

1 stop7h 49mFrontier

mié. 2/188:00 amDCA - ONT

1 stop28h 34mFrontier

Deal found 1/6

$149

sáb. 3/216:15 amONT - DCA

1 stop12h 44mFrontier

mar. 3/242:00 pmDCA - ONT

1 stop13h 01mFrontier

Deal found 1/7

$150

mar. 1/277:15 amONT - DCA

1 stop11h 44mFrontier

jue. 1/292:00 pmDCA - ONT

1 stop13h 20mFrontier

Deal found 1/7

$151

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 enero 8, 2026.

lun. 1/266:20 amONT - DCA

1 stop7h 39mFrontier

sáb. 1/312:00 pmDCA - ONT

1 stop12h 24mFrontier

Deal found 1/7

$144

mié. 1/2812:41 pmONT - DCA

1 stop6h 52mDelta

mar. 2/33:40 pmDCA - ONT

1 stop8h 25mDelta

Deal found 1/6

$257

mar. 1/277:15 amONT - DCA

1 stop11h 44mFrontier

sáb. 1/312:00 pmDCA - ONT

1 stop12h 24mFrontier

Deal found 1/6

$164

jue. 1/296:20 amONT - DCA

1 stop27h 42mFrontier

mié. 2/48:59 amDCA - ONT

1 stop9h 08mFrontier

Deal found 1/6

$170

mar. 2/248:35 amONT - DCA

1 stop10h 24mFrontier

mié. 2/258:00 amDCA - ONT

1 stop28h 34mFrontier

Deal found 1/7

$174

mar. 1/277:15 amONT - DCA

1 stop11h 44mFrontier

jue. 1/296:00 pmDCA - ONT

1 stop9h 20mFrontier

Deal found 1/6

$180

jue. 1/226:20 amONT - DCA

1 stop7h 39mFrontier

jue. 1/292:00 pmDCA - ONT

1 stop13h 20mFrontier

Deal found 1/8

$180

jue. 1/296:20 amONT - DCA

1 stop7h 39mFrontier

vie. 1/302:00 pmDCA - ONT

1 stop13h 20mFrontier

Deal found 1/6

$215

mar. 2/37:15 amONT - DCA

1 stop11h 44mFrontier

vie. 2/136:00 pmDCA - ONT

1 stop8h 59mFrontier

Deal found 1/7

$242

mar. 3/246:15 amONT - DCA

1 stop12h 44mFrontier

jue. 4/21:00 pmDCA - ONT

1 stop13h 59mFrontier

Deal found 1/5

$245

jue. 3/266:15 amONT - DCA

1 stop12h 44mFrontier

mar. 3/311:00 pmDCA - ONT

1 stop14h 01mFrontier

Deal found 1/5

$245

Last-minute flights from Ontario to Reagan-National
Discover last-minute flight deals from Ontario to Reagan-National. Data last updated enero 8, 2026 and is based on user searches.

vie. 1/236:20 amONT - DCA

1 stop12h 39mFrontier

dom. 1/256:00 pmDCA - ONT

1 stop9h 20mFrontier

Deal found 1/7

$147

dom. 1/256:20 amONT - DCA

1 stop12h 39mFrontier

mié. 1/288:59 amDCA - ONT

1 stop9h 08mFrontier

Deal found 1/7

$141

lun. 1/266:20 amONT - DCA

1 stop7h 39mFrontier

lun. 2/26:00 pmDCA - ONT

1 stop9h 20mFrontier

Deal found 1/7

$144

mar. 1/277:15 amONT - DCA

1 stop11h 44mFrontier

lun. 2/28:00 amDCA - ONT

1 stop19h 20mFrontier

Deal found 1/6

$150

mar. 1/277:15 amONT - DCA

1 stop11h 44mFrontier

jue. 1/292:00 pmDCA - ONT

1 stop13h 20mFrontier

Deal found 1/7

$151

jue. 1/296:20 amONT - DCA

1 stop12h 39mFrontier

mié. 2/48:59 amDCA - ONT

1 stop9h 08mFrontier

Deal found 1/8

$134

sáb. 1/317:15 amONT - DCA

1 stop6h 44mFrontier

dom. 2/86:00 pmDCA - ONT

1 stop9h 20mFrontier

Deal found 1/6

$146

sáb. 1/317:15 amONT - DCA

1 stop6h 44mFrontier

sáb. 2/76:00 pmDCA - ONT

1 stop8h 24mFrontier

Deal found 1/6

$148

mar. 2/37:15 amONT - DCA

1 stop11h 44mFrontier

sáb. 2/76:00 pmDCA - ONT

1 stop8h 24mFrontier

Deal found 1/6

$145

mar. 2/108:36 amONT - DCA

1 stop10h 23mFrontier

sáb. 2/146:00 pmDCA - ONT

1 stop8h 59mFrontier

Deal found 1/8

$139

mié. 2/118:10 amONT - DCA

1 stop7h 49mFrontier

mié. 2/188:00 amDCA - ONT

1 stop28h 34mFrontier

Deal found 1/6

$149

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 enero 8, 2026.

mar. 2/37:15 amONT - DCA

1 stop11h 44mFrontier

Deal found 1/7

$67

mar. 2/108:36 amONT - DCA

1 stop10h 23mFrontier

Deal found 1/7

$68

lun. 2/96:20 amONT - DCA

1 stop27h 55mFrontier

Deal found 1/7

$72

sáb. 1/317:15 amONT - DCA

1 stop6h 44mFrontier

Deal found 1/6

$73

sáb. 3/76:15 amONT - DCA

1 stop7h 44mFrontier

Deal found 1/6

$75

lun. 1/266:20 amONT - DCA

1 stop7h 39mFrontier

Deal found 1/7

$77

mar. 1/277:15 amONT - DCA

1 stop11h 44mFrontier

Deal found 1/7

$78

mié. 1/217:15 amONT - DCA

1 stop26h 47mFrontier

Deal found 1/7

$79

mar. 3/38:40 amONT - DCA

1 stop25h 35mFrontier

Deal found 1/6

$80

sáb. 3/216:15 amONT - DCA

1 stop12h 44mFrontier

Deal found 1/6

$81

mié. 1/287:15 amONT - DCA

1 stop26h 47mFrontier

Deal found 1/7

$83

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

lun. 1/26

6:20 am-4:59 pm

1 stop7h 39m

Washington, D.C. Reagan-National

sáb. 1/31

2:00 pm-11:24 pm

1 stop12h 24m

$144

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

mar. 1/27

7:15 am-9:59 pm

1 stop11h 44m

Washington, D.C. Reagan-National

sáb. 1/31

2:00 pm-11:24 pm

1 stop12h 24m

$164

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

jue. 1/29

6:20 am-1:02 pm

1 stop27h 42m

Washington, D.C. Reagan-National

mié. 2/4

8:59 am-3:07 pm

1 stop9h 08m

$170

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

mar. 2/24

8:35 am-9:59 pm

1 stop10h 24m

Washington, D.C. Reagan-National

mié. 2/25

8:00 am-9:34 am

1 stop28h 34m

$174

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

mar. 1/27

7:15 am-9:59 pm

1 stop11h 44m

Washington, D.C. Reagan-National

jue. 1/29

6:00 pm-12:20 am

1 stop9h 20m

$180

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

jue. 1/22

6:20 am-4:59 pm

1 stop7h 39m

Washington, D.C. Reagan-National

jue. 1/29

2:00 pm-12:20 am

1 stop13h 20m

$180

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

jue. 1/29

6:20 am-4:59 pm

1 stop7h 39m

Washington, D.C. Reagan-National

vie. 1/30

2:00 pm-12:20 am

1 stop13h 20m

$215

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

mar. 2/3

7:15 am-9:59 pm

1 stop11h 44m

Washington, D.C. Reagan-National

vie. 2/13

6:00 pm-11:59 pm

1 stop8h 59m

$242

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

mar. 3/24

6:15 am-9:59 pm

1 stop12h 44m

Washington, D.C. Reagan-National

jue. 4/2

1:00 pm-11:59 pm

1 stop13h 59m

$245

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

jue. 3/26

6:15 am-9:59 pm

1 stop12h 44m

Washington, D.C. Reagan-National

mar. 3/31

1:00 pm-12:01 am

1 stop14h 01m

$245

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/7

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 January.

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 $229). 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.

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

8.0

Very good

4,250 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

8.0

Very good

4,250 reviews

Southwest

8.0

Very good

4,250 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

8,025 reviews

Southwest

8.0

Very good

4,250 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

9,139 reviews

Southwest

8.0

Very good

4,250 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

11,095 reviews

Southwest

8.0

Very good

4,250 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

5.7

Fair

3,062 reviews

Southwest

8.0

Very good

4,250 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 can get you from Ontario to Washington, D.C. Reagan-National Airport in just under 7h 39m. 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 $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 Delta and United Airlines. You may be able to fly from Ontario to Washington, D.C. Reagan-National Airport for 62% 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 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, 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 $229). 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

Silver Spring

Hanover

Fredericksburg

Linthicum Heights

Rockville

Laurel

Towson

Manassas

National Harbor

Bowie

Largo

McLean

Clinton

Cordova

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$287	FlexibilityNo cancel fee	On-time62%
United Airlines	Cheapest$226	Average$424	FlexibilityNo cancel fee	On-time69%
Southwest	Cheapest$258	Average$440	FlexibilityNo cancel fee	On-time63%
Delta	Cheapest$276	Average$398	FlexibilityNo cancel fee	On-timeN/A
American Airlines	Cheapest$326	Average$493	FlexibilityNo cancel fee	On-time71%

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$67+ 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 2/3. 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

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Cheap 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

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 enero 8, 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 enero 8, 2026.

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 January.

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?

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 enero 8, 2026.