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Ontario

$128+ Cheap flights from District of Columbia 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 9/4. Fares are subject to change and may not be available on all flights or dates of travel.
BWI — ONT
ago. 5 — ago. 121
mar. 8/5
mar. 8/12
1 adult, Economy
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Cheap flight deals from District of Columbia to Ontario

Keep the following information in mind while searching for District of Columbia to Ontario flight deals. Data was last updated julio 31, 2025.

Round-trip from

$256
(Gotogate)

One-way from

$129
(Gotogate)

Popular in

December

Cheapest in

August

Average price

$329
From District of Columbia to Ontario
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One-way flight from District of Columbia to Ontario
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Highest demand for flights based on searches. 9% potential increase in price ($37 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($12 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 District of Columbia to Ontario

Cheapest flights from District of Columbia to Ontario
Explore the most affordable flight options available from District of Columbia to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on julio 31, 2025.

This Gotogate deal was found by Cheapflights users on 7/30. 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.
sáb. 8/306:00 pmDCA - ONT
1 stop8h 50mFrontier
sáb. 9/68:59 pmONT - DCA
1 stop12h 11mFrontier
Deal found 7/30$256
This Mytrip deal was found by Cheapflights users on 7/30. 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.
sáb. 8/912:27 pmIAD - ONT
1 stop9h 47mFrontier
mar. 8/127:00 amONT - IAD
1 stop20h 34mFrontier
Deal found 7/30$258
This Delta deal was found by Cheapflights users on 7/29. 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.
sáb. 8/306:00 amIAD - ONT
1 stop7h 20mDelta
sáb. 9/67:05 amONT - IAD
1 stop8h 44mDelta
Deal found 7/29$277
This Delta deal was found by Cheapflights users on 7/31. 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.
sáb. 8/236:00 amDCA - ONT
1 stop7h 35mDelta
mar. 8/266:05 amONT - DCA
1 stop7h 05mDelta
Deal found 7/31$279
This Alaska Airlines deal was found by Cheapflights users on 7/30. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 8/277:00 amIAD - ONT
1 stop10h 09mAlaska Airlines
mié. 9/311:39 amONT - IAD
1 stop9h 44mAlaska Airlines
Deal found 7/30$279
This American Airlines deal was found by Cheapflights users on 7/29. 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.
mar. 8/197:44 amIAD - ONT
2 stops11h 22mAmerican Airlines
sáb. 8/2311:59 pmONT - IAD
1 stop8h 02mAmerican Airlines
Deal found 7/29$284
This Hawaiian Airlines deal was found by Cheapflights users on 7/29. 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 Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 9/57:00 amIAD - ONT
1 stop10h 12mHawaiian Airlines
vie. 9/197:40 pmONT - IAD
1 stop8h 53mHawaiian Airlines
Deal found 7/29$326
This American Airlines deal was found by Cheapflights users on 7/30. 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.
vie. 8/295:30 pmDCA - ONT
1 stop7h 09mAmerican Airlines
vie. 9/51:10 pmONT - DCA
2 stops8h 48mAmerican Airlines
Deal found 7/30$332
This Southwest deal was found by Cheapflights users on 7/30. 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.
jue. 11/135:40 pmDCA - ONT
2 stops17h 05mSouthwest
dom. 11/161:05 pmONT - DCA
1 stop6h 50mSouthwest
Deal found 7/30$355
This Southwest deal was found by Cheapflights users on 7/28. 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.
mar. 8/265:45 amIAD - ONT
2 stops10h 35mSouthwest
mié. 9/310:20 amONT - IAD
2 stops8h 45mSouthwest
Deal found 7/28$363

Cheapflights Fare Finder

 
Customize your flight search to find flights from District of Columbia 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 julio 31, 2025.
Use the filters below to find and compare flights from District of Columbia to Ontario that are best for you.

Fly from

District of Columbia

Fly to

Ontario

Route

Depart

Return

Price

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

sáb. 8/30

6:00 pm-11:50 pm

1 stop8h 50m

Ontario

sáb. 9/6

8:59 pm-12:10 pm

1 stop12h 11m

$256

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

sáb. 8/9

12:27 pm-7:14 pm

1 stop9h 47m

Ontario

mar. 8/12

7:00 am-6:34 am

1 stop20h 34m

$258

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

sáb. 8/30

6:00 am-10:20 am

1 stop7h 20m

Ontario

sáb. 9/6

7:05 am-6:49 pm

1 stop8h 44m

$277

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

mié. 8/27

12:35 pm-5:29 pm

1 stop7h 54m

Ontario

mié. 9/3

6:38 pm-5:22 am

1 stop7h 44m

$279

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

sáb. 8/23

6:00 am-10:35 am

1 stop7h 35m

Ontario

mar. 8/26

6:05 am-4:10 pm

1 stop7h 05m

$279

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

mar. 8/19

7:44 am-4:06 pm

2 stops11h 22m

Ontario

sáb. 8/23

11:59 pm-11:01 am

1 stop8h 02m

$284

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

jue. 9/4

7:00 am-2:12 pm

1 stop10h 12m

Ontario

mié. 9/10

11:39 am-12:23 am

1 stop9h 44m

$298

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

dom. 1/11

11:54 am-5:53 pm

1 stop8h 59m

Ontario

mié. 1/14

6:37 am-4:16 pm

1 stop6h 39m

$303

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

vie. 9/5

7:00 am-2:12 pm

1 stop10h 12m

Ontario

vie. 9/19

7:40 pm-7:33 am

1 stop8h 53m

$326

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

jue. 11/13

5:40 pm-7:45 am

2 stops17h 05m

Ontario

dom. 11/16

1:05 pm-10:55 pm

1 stop6h 50m

$355

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/29

Showing 1-10 of 26 results
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Best time to book a flight from District of Columbia to Ontario

Have a flexible travel schedule? Discover the best time to fly to Ontario from District of Columbia 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 District of Columbia to Ontario

What is the cheapest month to book a flight from District of Columbia to Ontario?

Currently, August is the cheapest month in which you can book a flight from District of Columbia to Ontario (average of $246). Flying from District of Columbia 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 DC to ONT?

Find hourly flight availability from District of Columbia 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 julio 31, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from District of Columbia to Ontario as you normally would.

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 julio 31, 2025.
Peruse reviews from past customers who have flown with Alaska Airlines, Southwest, and Delta from District of Columbia to Ontario to help guide your decision. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Entertainment

7.1

Boarding

8.1

Overall

8.0

Crew

8.5

Comfort

7.8

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

Food

7.1

Entertainment

7.1

Boarding

8.1

Overall

8.0

Crew

8.5

Comfort

7.8

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
4,246 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Entertainment

7.1

Boarding

8.1

Overall

8.0

Crew

8.5

Comfort

7.8

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
7,981 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Entertainment

7.1

Boarding

8.1

Overall

8.0

Crew

8.5

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Hawaiian Airlines
7.8
Good
2,611 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Entertainment

7.1

Boarding

8.1

Overall

8.0

Crew

8.5

Comfort

7.8

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
8,900 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Entertainment

7.1

Boarding

8.1

Overall

8.0

Crew

8.5

Comfort

7.8

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 District of Columbia 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 District of Columbia?

    If you book a flight to Ontario from District of Columbia, you will be flying to Ontario, which is the city’s only airport. Ontario (ONT) is located 3.1 mi from the center of Ontario.

  • How popular is this District of Columbia to Ontario flight route?

    Within the past month, 1 users have taken a look at flights from District of Columbia to Ontario.

  • What are the cheapest airlines to fly from District of Columbia to Ontario one-way?

    The cheapest airlines for a one-way flight from District of Columbia to Ontario are Frontier ($129), Alaska Airlines ($136), and Delta ($140).

  • What are the cheapest flights from District of Columbia to Ontario?

    The cheapest flight price from District of Columbia to Ontario is $102. On average you can expect to pay $303. The most popular route, (Washington, D.C. Dulles Intl - Ontario), can usually be booked for $268.

  • Can I find deals for flights from District of Columbia to Ontario that include hotel bookings?

    Yes. In addition to deals on District of Columbia to Ontario flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from District of Columbia to Ontario?

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

  • Can I find deals for business class flights from District of Columbia to Ontario?

    Yes. Cheapflights offers flight deals from District of Columbia 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 District of Columbia to Ontario?

    Currently, August is the cheapest month in which you can book a flight from District of Columbia to Ontario (average of $246). Flying from District of Columbia 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.

See more FAQs

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Alternative routes for District of Columbia to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
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Top 5 airlines flying from District of Columbia to Ontario

Discover the top 5 airlines that operate flights from District of Columbia 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 julio 31, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$148Average$275FlexibilityNo cancel feeOn-time62%
DeltaCheapest$286Average$415FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$286Average$454FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$310Average$517FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$326Average$498FlexibilityNo cancel feeOn-time63%

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