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$47+ Cheap flights from Reagan-National (DCA) to Ontario (ONT)

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 10/1. Fares are subject to change and may not be available on all flights or dates of travel.
DCA — ONT
Oct 17 — Oct 241
Fri 10/17
Fri 10/24
1 adult, Economy
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Cheapflights Tip: The best prices from Washington, D.C. Reagan-National to Ontario are usually found in November or October, booked 30 days in advance, depart on a Saturday or Tuesday and return on a Tuesday

Cheap flight deals from Reagan-National to Ontario

Discover tips and strategies to find the most affordable flight options for your journey from Reagan-National (DCA) to Ontario (ONT). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated September 17, 2025.

Round-trip from

$167
(Gotogate)

One-way from

$47
(Trip.com)

Popular in

June

Cheapest in

November

Average price

$333
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. 16% potential increase in price ($68 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($14 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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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 September 17, 2025.

This Gotogate deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/17:00 amDCA - ONT
1 stop27h 23mFrontier
Sat 10/48:59 pmONT - DCA
1 stop12h 11mFrontier
Deal found 9/15$167
This Flybillet deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Flybillet is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/16:00 pmDCA - ONT
1 stop8h 50mFrontier
Sat 11/86:53 amONT - DCA
1 stop12h 06mFrontier
Deal found 9/15$168
This Booking.com deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/157:00 amDCA - ONT
1 stop29h 35mFrontier
Tue 10/217:04 amONT - DCA
1 stop6h 55mFrontier
Deal found 9/15$169
This Frontier deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/176:31 pmDCA - ONT
1 stop8h 19mFrontier
Thu 10/236:53 amONT - DCA
1 stop12h 06mFrontier
Deal found 9/14$177
This Flightnetwork deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/247:00 amDCA - ONT
1 stop27h 23mFrontier
Mon 9/298:59 pmONT - DCA
1 stop22h 00mFrontier
Deal found 9/15$193
This Mytrip deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/266:00 pmDCA - ONT
1 stop28h 54mFrontier
Tue 9/308:59 pmONT - DCA
1 stop22h 00mFrontier
Deal found 9/16$198
This Booking.com deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/266:00 pmDCA - ONT
1 stop28h 54mFrontier
Mon 9/298:59 pmONT - DCA
1 stop17h 00mFrontier
Deal found 9/15$199
This Booking.com deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/61:00 pmDCA - ONT
1 stop13h 50mFrontier
Sun 11/96:53 amONT - DCA
1 stop7h 06mFrontier
Deal found 9/15$200
This Booking.com deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/247:00 amDCA - ONT
1 stop19h 50mFrontier
Sun 10/266:53 amONT - DCA
1 stop26h 11mFrontier
Deal found 9/15$205
This Booking.com deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/41:00 pmDCA - ONT
1 stop21h 23mFrontier
Mon 10/64:08 pmONT - DCA
1 stop26h 51mFrontier
Deal found 9/16$207
This Frontier deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/302:00 pmDCA - ONT
1 stop12h 50mFrontier
Sat 11/812:05 pmONT - DCA
1 stop6h 54mFrontier
Deal found 9/15$208

Cheapflights Fare Finder

 
Customize your flight search to find flights from Reagan-National to Ontario that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated September 17, 2025.
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

Reagan-National

Fly to

Ontario

Route

Depart

Return

Price

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Fri 10/17

6:31 pm-11:50 pm

1 stop8h 19m

Ontario

Sat 10/25

7:04 am-4:59 pm

1 stop6h 55m

$177

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Tue 2/24

5:15 pm-11:52 pm

1 stop9h 37m

Ontario

Sat 2/28

10:30 pm-9:14 am

1 stop7h 44m

$277

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Sat 11/1

6:00 am-10:26 am

1 stop7h 26m

Ontario

Sat 11/8

11:36 am-9:43 pm

1 stop7h 07m

$278

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Fri 10/31

12:06 pm-10:41 pm

2 stops13h 35m

Ontario

Tue 11/4

7:05 am-5:17 pm

1 stop7h 12m

$282

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Tue 11/4

5:10 pm-9:20 pm

1 stop7h 10m

Ontario

Wed 11/12

11:45 am-9:43 pm

1 stop6h 58m

$317

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Thu 11/13

3:06 pm-11:52 pm

2 stops11h 46m

Ontario

Tue 11/18

6:45 am-11:04 pm

2 stops13h 19m

$328

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Wed 10/15

2:50 pm-8:40 pm

2 stops8h 50m

Ontario

Wed 10/22

6:15 am-11:25 pm

2 stops14h 10m

$333

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Tue 12/9

6:00 am-10:40 am

1 stop7h 40m

Ontario

Fri 12/12

10:25 pm-9:12 am

1 stop7h 47m

$350

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Tue 11/4

6:00 am-10:26 am

1 stop7h 26m

$139

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Sat 11/1

5:53 pm-11:56 pm

1 stop9h 03m

$159

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/15

Showing 1-10 of 19 results
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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

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

Use this chart to determine the optimal time to book a round-trip flight from Reagan-National to Ontario. Price data was last updated on September 12, 2025.

To ensure you get the cheapest price possible for a flight from Washington, D.C. Reagan-National Airport to Ontario, you should look to book at least 30 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

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

Currently, August is the cheapest month in which you can book a flight from Washington, D.C. Reagan-National Airport to Ontario (average of $246). Flying from Washington, D.C. Reagan-National Airport to Ontario in March is currently the most expensive (average of $327). 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 ONT?

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 September 17, 2025.

A simple way to save on the total cost of your ticket is to fly from Washington, D.C. Reagan-National Airport to Ontario in the afternoon. If you’re flexible enough to do this you can expect to save up to 31% on your trip compared to booking a flight in the evening.

Reviews of airlines servicing Ontario

Get insights into the airlines that provide service to Ontario. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Ontario. Reviews last updated September 17, 2025.
See what other customers who have flown with Southwest, Delta, and American Airlines from Washington, D.C. Reagan-National Airport to Ontario have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,242 reviews

Boarding

8.1

Overall

8.0

Comfort

8.0

Crew

8.6

Entertainment

7.5

Food

7.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Southwest
8.0
Very good
4,242 reviews
Southwest
8.0
Very good
4,242 reviews

Boarding

8.1

Overall

8.0

Comfort

8.0

Crew

8.6

Entertainment

7.5

Food

7.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Delta
8.0
Very good
7,961 reviews
Southwest
8.0
Very good
4,242 reviews

Boarding

8.1

Overall

8.0

Comfort

8.0

Crew

8.6

Entertainment

7.5

Food

7.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,242 reviews

Boarding

8.1

Overall

8.0

Comfort

8.0

Crew

8.6

Entertainment

7.5

Food

7.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Frontier
5.8
Fair
3,173 reviews
Southwest
8.0
Very good
4,242 reviews

Boarding

8.1

Overall

8.0

Comfort

8.0

Crew

8.6

Entertainment

7.5

Food

7.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.

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

    Ontario (ONT) is the airport you will fly into if you book a flight from Washington, D.C. Reagan-National to Ontario. You should not have trouble finding flights to Ontario from Washington, D.C. Reagan-National; the airport handles an average of 0 inbound flights from Washington, D.C. Reagan-National per day. You should also have plenty of airline options to choose from since 4 airlines have flights to the Ontario airport from Washington, D.C. Reagan-National. It is only a 3.1 mi journey from Ontario (ONT) to Ontario’s city center.

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

    There are many flights that can get you from Washington, D.C. Reagan-National Airport to Ontario in 8h 19m. Fly via Frontier or Delta to get the fastest option. The distance from Washington, D.C. Reagan-National Airport to Ontario is about 2258 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

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

    Our cheapest airline available from Washington, D.C. Reagan-National Airport to Ontario is Frontier. Our recent data shows that you can find tickets from as low as $150 on this airline. Additional options worth looking into are Delta and American Airlines, starting at $278 and $296 round-trip. Frontier is priced at 56% lower than the current average price of a flight leaving 3 months from now.

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

    The cheapest airline one-way is Delta, with whom users have recently found tickets for as low as $139. However, be on the lookout for offers from Alaska Airlines and Southwest, as they are both options that can get you from Washington, D.C. Reagan-National Airport to Ontario for a low price.

  • 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 Ontario?

    Currently, August is the cheapest month in which you can book a flight from Washington, D.C. Reagan-National Airport to Ontario (average of $246). Flying from Washington, D.C. Reagan-National Airport to Ontario in March is currently the most expensive (average of $327). 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.

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Alternative routes for Reagan-National to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
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Top 4 airlines flying from Reagan-National to Ontario

Discover the top 4 airlines that operate flights from Reagan-National to Ontario. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated September 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$150Average$250FlexibilityNo cancel feeOn-time62%
DeltaCheapest$278Average$397FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$296Average$496FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$348Average$448FlexibilityNo cancel feeOn-time63%

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