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$64+ Cheap flights from Washington, D.C. (WAS) 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 1/14. Fares are subject to change and may not be available on all flights or dates of travel.
WAS — ONT
Dec 23 — Dec 301
Mon 12/23
Mon 12/30
1 adult, Economy
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The best prices from Washington, D.C. to Ontario are usually found in February or May, booked 77 days in advance, depart on a Tuesday or Saturday and return on a Wednesday

Cheap flight deals from Washington, D.C. to Ontario

Discover tips and strategies to find the most affordable flight options for your journey from Washington, D.C. (WAS) 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 December 18, 2024.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$281
(flugladen.de)

One-way from

$64
(Cheapflightsfares)

Popular in

June

Cheapest in

February

Average price

$428
Provider with most accurate pricing for Washington, D.C. (WAS)-Ontario flight deals.
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Provider most trusted by Cheapflights users for Washington, D.C. (WAS)-Ontario flights.
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From Washington, D.C. (WAS) to Ontario
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One-way flight from Washington, D.C. (WAS) to Ontario
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High demand for flights, 3% potential price rise
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Best time to find cheap flights, 2% potential price drop
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Average for round-trip flights in December 2024
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Find flight deals from Washington, D.C. to Ontario

Cheapest flights from Washington, D.C. to Ontario
Explore the most affordable flight options available from Washington, D.C. to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 18, 2024.

This Frontier deal was found by Cheapflights users on 12/17. 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.
Tue 12/316:00 pmDCA - ONT
1 stop8h 59mFrontier
Thu 1/212:59 amONT - DCA
1 stop8h 09mFrontier
Deal found 12/17$344
This CheapOair deal was found by Cheapflights users on 12/17. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/272:16 pmBWI - ONT
1 stop9h 03mFrontier
Sun 1/512:59 amONT - BWI
1 stop9h 27mFrontier
Deal found 12/17$408
This Delta deal was found by Cheapflights users on 12/17. 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.
Thu 12/196:00 amIAD - ONT
1 stop7h 46mDelta
Wed 12/251:05 pmONT - IAD
1 stop7h 14mDelta
Deal found 12/17$545
This Southwest deal was found by Cheapflights users on 12/17. 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.
Tue 12/2412:50 pmDCA - ONT
2 stops10h 15mSouthwest
Fri 1/35:30 amONT - DCA
2 stops9h 30mSouthwest
Deal found 12/17$574
This United Airlines deal was found by Cheapflights users on 12/17. 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.
Tue 12/312:38 pmBWI - ONT
1 stop10h 51mUnited Airlines
Thu 1/236:00 amONT - BWI
1 stop7h 20mUnited Airlines
Deal found 12/17$577
This United Airlines deal was found by Cheapflights users on 12/17. 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.
Wed 12/256:30 amIAD - ONT
1 stop9h 10mUnited Airlines
Wed 1/85:10 amONT - IAD
1 stop7h 39mUnited Airlines
Deal found 12/17$582
This American Airlines deal was found by Cheapflights users on 12/17. 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.
Wed 12/258:30 amDCA - ONT
1 stop8h 28mAmerican Airlines
Sun 12/297:30 pmONT - DCA
1 stop8h 35mAmerican Airlines
Deal found 12/17$616
This Delta deal was found by Cheapflights users on 12/17. 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.
Mon 12/306:50 pmBWI - ONT
1 stop7h 51mDelta
Tue 1/71:21 pmONT - BWI
1 stop7h 13mDelta
Deal found 12/17$652
This Delta deal was found by Cheapflights users on 12/17. 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.
Fri 12/206:00 amDCA - ONT
1 stop7h 46mDelta
Wed 12/255:30 amONT - DCA
1 stop7h 30mDelta
Deal found 12/17$677
This American Airlines deal was found by Cheapflights users on 12/16. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/255:15 pmIAD - ONT
1 stop8h 13mAmerican Airlines
Wed 1/110:18 pmONT - IAD
1 stop7h 31mAmerican Airlines
Deal found 12/16$683
This Southwest deal was found by Cheapflights users on 12/17. 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.
Tue 12/247:25 amIAD - ONT
2 stops10h 55mSouthwest
Fri 1/35:30 amONT - IAD
1 stop10h 30mSouthwest
Deal found 12/17$711
This American Airlines deal was found by Cheapflights users on 12/17. 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.
Wed 12/253:20 pmBWI - ONT
1 stop10h 08mAmerican Airlines
Sun 12/296:05 amONT - BWI
1 stop9h 05mAmerican Airlines
Deal found 12/17$742

Find flights from Washington, D.C. to Ontario within your budget

Customize your flight search to find flights from Washington, D.C. 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 December 18, 2024.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Mon 2/3

1:01 pm-5:28 pm

1 stop7h 27m

Ontario

Mon 2/10

6:34 pm-9:59 pm

1 stop24h 25m

$281

BaltimoreOntario

BWI - ONT

BWIONT

Baltimore/Washington

Tue 1/7

7:15 am-12:26 pm

1 stop8h 11m

Ontario

Tue 1/21

1:21 pm-11:34 pm

1 stop7h 13m

$346

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Thu 1/30

6:00 pm-11:47 pm

1 stop8h 47m

Ontario

Thu 2/6

7:00 am-9:59 pm

2 stops11h 59m

$346

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Wed 1/8

7:20 am-12:26 pm

1 stop8h 06m

Ontario

Wed 2/12

1:00 pm-12:20 am

1 stop8h 20m

$346

BaltimoreOntario

BWI - ONT

BWIONT

Baltimore/Washington

Wed 3/12

6:03 am-1:54 pm

1 stop10h 51m

Ontario

Tue 3/18

10:27 pm-9:30 am

1 stop8h 03m

$348

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Tue 1/14

9:11 am-6:24 pm

2 stops12h 13m

Ontario

Tue 1/28

10:56 am-10:41 pm

1 stop8h 45m

$351

BaltimoreOntario

BWI - ONT

BWIONT

Baltimore/Washington

Fri 1/3

2:16 pm-8:19 pm

1 stop9h 03m

Ontario

Sun 1/5

12:59 am-1:26 pm

1 stop9h 27m

$354

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Tue 2/4

6:57 pm-8:13 pm

1 stop28h 16m

Ontario

Tue 2/11

6:00 am-5:57 pm

1 stop8h 57m

$374

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Fri 2/7

4:50 pm-11:51 pm

2 stops10h 01m

Ontario

Tue 2/11

1:00 pm-11:39 pm

1 stop7h 39m

$376

BaltimoreOntario

BWI - ONT

BWIONT

Baltimore/Washington

Wed 1/22

4:10 pm-8:51 pm

1 stop7h 41m

Ontario

Thu 1/30

6:00 am-4:20 pm

1 stop7h 20m

$381

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/17

Showing 1-10 of 36 results
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Compare providers for flights from Washington, D.C. to Ontario

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 Washington, D.C. to Ontario in December.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
MytripPrice Accuracy3 starsTrust Score*3 stars
CheapflightsfaresPrice Accuracy3 starsTrust Score*1 star
CheapfaremartPrice Accuracy-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 Washington, D.C.-Ontario flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Washington, D.C.-Ontario flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Washington, D.C.-Ontario flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Washington, D.C.-Ontario flights, Cheapflights users trust FlightHub the most. FlightHub 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 Washington, D.C.-Ontario 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 Washington, D.C. to Ontario

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

Travel insights for flights from Washington, D.C. to Ontario

Get recent, data-driven insights about flights from Washington, D.C. to Ontario including ideal travel times, pricing trends, and more.

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

Use this chart to determine the optimal time to book a round-trip flight from Washington, D.C. to Ontario. Price data was last updated on December 13, 2024.

The best time to book flights from Washington, D.C. to Ontario is 77 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

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

Currently, September is the cheapest month in which you can book a flight from Washington, D.C. to Ontario (average of $236). Flying from Washington, D.C. to Ontario in December is currently the most expensive (average of $298). 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 WAS to ONT?

Find hourly flight availability from Washington, D.C. 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 December 18, 2024.

It’s typically best to fly out from Washington, D.C. to Ontario in the afternoon. Doing so could potentially save you 16% on the flight price compared to flying in the evening, which is usually more expensive.

What is the cheapest day to fly from Washington, D.C. to Ontario?

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

Travelers seeking maximum savings on their Washington, D.C. to Ontario flight should consider departing on Saturday evenings when fares are most often at their lowest. Friday evenings flights should be avoided if possible as fares are typically the most expensive at this time.

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 December 18, 2024.
See what other customers who have flown with Frontier, American Airlines and Alaska Airlines from Washington, D.C. to Ontario have to say. In addition to providing an overall rating, users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.1
Very good
4,848 reviews

Boarding

8.2

Comfort

8.1

Entertainment

7.7

Crew

8.7

Overall

8.1

Food

7.2

Reviews

1 / 10

No issues. I needed pre boarding and I was able to get it without issue

Southwest
8.1
Very good
4,848 reviews
Southwest
8.1
Very good
4,848 reviews

Boarding

8.2

Comfort

8.1

Entertainment

7.7

Crew

8.7

Overall

8.1

Food

7.2

Reviews

1 / 10

No issues. I needed pre boarding and I was able to get it without issue

Alaska Airlines
8.0
Very good
9,554 reviews
Southwest
8.1
Very good
4,848 reviews

Boarding

8.2

Comfort

8.1

Entertainment

7.7

Crew

8.7

Overall

8.1

Food

7.2

Reviews

1 / 10

No issues. I needed pre boarding and I was able to get it without issue

Delta
8.0
Very good
8,604 reviews
Southwest
8.1
Very good
4,848 reviews

Boarding

8.2

Comfort

8.1

Entertainment

7.7

Crew

8.7

Overall

8.1

Food

7.2

Reviews

1 / 10

No issues. I needed pre boarding and I was able to get it without issue

United Airlines
7.4
Good
9,055 reviews
Southwest
8.1
Very good
4,848 reviews

Boarding

8.2

Comfort

8.1

Entertainment

7.7

Crew

8.7

Overall

8.1

Food

7.2

Reviews

1 / 10

No issues. I needed pre boarding and I was able to get it without issue

American Airlines
7.2
Good
10,000 reviews
Southwest
8.1
Very good
4,848 reviews

Boarding

8.2

Comfort

8.1

Entertainment

7.7

Crew

8.7

Overall

8.1

Food

7.2

Reviews

1 / 10

No issues. I needed pre boarding and I was able to get it without issue

Related info for your journey

Find useful and relevant information for your journey from Washington, D.C. 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.?

    Located just 3.1 mi from the city center, Ontario is the airport most travelers will use when flying to Ontario from Washington, D.C.. Booking flights from Washington, D.C. to Ontario (ONT) should be relatively easy as there are 0 daily inbound flights from Washington, D.C. from 6 different airlines.

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

    Cheapflights users have booked flights from Washington, D.C. to Ontario round-trip from $281. Other airlines that can offer you cheap pricing are Delta, from $346, and American Airlines, from $348. Users have found that Frontier is 24% cheaper than the other options available to this destination.

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

    The cheapest airlines for a one-way flight from Washington, D.C. to Ontario are Frontier ($64), Delta ($168), and American Airlines ($173).

  • What are the most popular routes from Washington, D.C. to Ontario?

    The most popular route from Washington, D.C. to Ontario is Baltimore/Washington - Ontario. You may also consider Washington, D.C. Reagan-National - Ontario or Washington, D.C. Dulles Intl - Ontario.

  • Can I find deals for flights from Washington, D.C. to Ontario that include hotel bookings?

    Yes. In addition to deals on Washington, D.C. to Ontario flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Washington, D.C. to Ontario?

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

  • Can I find deals for business class flights from Washington, D.C. to Ontario?

    Yes. Cheapflights offers flight deals from Washington, D.C. 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. to Ontario?

    Currently, September is the cheapest month in which you can book a flight from Washington, D.C. to Ontario (average of $236). Flying from Washington, D.C. to Ontario in December is currently the most expensive (average of $298). 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 Washington, D.C. to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
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Top 6 airlines flying from Washington, D.C. to Ontario

Discover the top 6 airlines that operate flights from Washington, D.C. 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 December 18, 2024.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$148Average$264FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$154Average$229FlexibilityNo cancel feeOn-time65%
United AirlinesCheapest$195Average$488FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$219Average$509FlexibilityNo cancel feeOn-time71%
DeltaCheapest$256Average$450FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$326Average$487FlexibilityNo cancel feeOn-time63%
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