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$133+ 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 9/23. Fares are subject to change and may not be available on all flights or dates of travel.
DCA — ONT
jun. 17 — jun. 241
mar. 6/17
mar. 6/24
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 February, 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 junio 12, 2025.

Round-trip from

$258
(Kiwi.com)

One-way from

$133
(FlightHub)

Popular in

June

Cheapest in

November

Average price

$417
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. 9% potential increase in price ($35 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($7 potential savings vs. average RT price).
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Average for round-trip flights in June 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 junio 12, 2025.

This Kiwi.com deal was found by Cheapflights users on 6/10. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 8/316:00 pmDCA - ONT
1 stop8h 50mFrontier
jue. 9/1112:59 amONT - DCA
1 stop8h 12mFrontier
Deal found 6/10$258
This Delta deal was found by Cheapflights users on 6/10. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 8/126:00 amDCA - ONT
1 stop7h 35mDelta
mié. 8/2011:45 amONT - DCA
1 stop7h 02mDelta
Deal found 6/10$297
This American Airlines deal was found by Cheapflights users on 6/11. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 8/146:45 amDCA - ONT
1 stop9h 56mAmerican Airlines
dom. 8/1711:59 pmONT - DCA
1 stop9h 38mAmerican Airlines
Deal found 6/11$298
This United Airlines deal was found by Cheapflights users on 6/11. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 7/14:59 pmDCA - ONT
1 stop7h 38mUnited Airlines
mié. 7/167:00 amONT - DCA
1 stop8h 02mUnited Airlines
Deal found 6/11$329
This Southwest deal was found by Cheapflights users on 6/9. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 6/306:00 amDCA - ONT
1 stop11h 45mSouthwest
jue. 7/38:50 amONT - DCA
1 stop9h 05mSouthwest
Deal found 6/9$353

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 junio 12, 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

dom. 8/31

6:00 pm-11:50 pm

1 stop8h 50m

Ontario

jue. 9/11

12:59 am-12:11 pm

1 stop8h 12m

$258

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

mar. 8/12

6:00 am-10:35 am

1 stop7h 35m

Ontario

mié. 8/20

11:45 am-9:47 pm

1 stop7h 02m

$297

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

jue. 8/14

6:45 am-1:41 pm

1 stop9h 56m

Ontario

dom. 8/17

11:59 pm-12:37 pm

1 stop9h 38m

$298

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

mar. 7/1

4:59 pm-9:37 pm

1 stop7h 38m

Ontario

mié. 7/16

7:00 am-6:02 pm

1 stop8h 02m

$329

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

lun. 6/30

6:00 am-2:45 pm

1 stop11h 45m

Ontario

jue. 7/3

8:50 am-8:55 pm

1 stop9h 05m

$353

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

mar. 9/23

6:00 pm-11:50 pm

1 stop8h 50m

$133

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

mar. 8/12

8:00 am-2:46 pm

1 stop9h 46m

$148

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

vie. 8/22

5:06 pm-11:59 pm

1 stop9h 53m

$149

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

sáb. 8/16

6:00 am-10:35 am

1 stop7h 35m

$150

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

mié. 12/3

2:50 pm-9:21 pm

1 stop9h 31m

$199

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/11

Showing 1-10 of 12 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 June 9, 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 $328). 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 junio 12, 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.

Rainfall in Ontario by month

Plan your trip to Ontario by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Ontario ranges from 0.1 - 3.4 inches per month. February is typically the wettest month, when rainfall can reach 3.4 in. June is typically the driest time to visit Ontario when rainfall is around 0.1 in.

Temperature in Ontario by month

Plan your trip to Ontario by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Ontario, use this chart to help with planning. For those seeking warmer temperatures, August is the ideal time of year to visit, when temperatures reach an average of 78.8 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 53.6 F).

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 junio 12, 2025.
Read reviews from past customers who have flown Alaska Airlines, Southwest and Delta from Washington, D.C. to Ontario. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Entertainment

7.1

Food

7.1

Boarding

8.1

Comfort

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Entertainment

7.1

Food

7.1

Boarding

8.1

Comfort

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Southwest
8.0
Very good
4,287 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Entertainment

7.1

Food

7.1

Boarding

8.1

Comfort

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Delta
8.0
Very good
7,950 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Entertainment

7.1

Food

7.1

Boarding

8.1

Comfort

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Hawaiian Airlines
7.9
Good
2,494 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Entertainment

7.1

Food

7.1

Boarding

8.1

Comfort

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
United Airlines
7.4
Good
8,790 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Entertainment

7.1

Food

7.1

Boarding

8.1

Comfort

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

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.

  • 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 $258 on this airline. Additional options worth looking into are Delta and American Airlines, starting at $297 and $298 round-trip. Frontier is priced at 26% 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 Frontier, with whom users have recently found tickets for as low as $133. However, be on the lookout for offers from Hawaiian Airlines and Alaska Airlines, 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 $328). 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 junio 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$150Average$263FlexibilityNo cancel feeOn-time62%
DeltaCheapest$290Average$449FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$296Average$486FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$348Average$458FlexibilityNo cancel feeOn-time63%

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