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Ontario

$94+ 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 5/7. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — ONT
May 6 — May 131
Tue 5/6
Tue 5/13
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 May 1, 2025.

Most accurate provider

Mytrip
3 stars

Most trusted provider

Mytrip
3 stars

Round-trip from

$215
(Cheapflightsfares)

One-way from

$94
(Cheapflightsfares)

Popular in

December

Cheapest in

September

Average price

$327
Provider with most accurate pricing for Washington, D.C. (WAS)-Los Angeles flight deals.
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Provider most trusted by Cheapflights users for Washington, D.C. (WAS)-Los Angeles flights.
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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. 8% potential increase in price ($31 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 May 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 May 1, 2025.

This Trip.com deal was found by Cheapflights users on 4/30. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/67:00 amDCA - ONT
1 stop19h 59mFrontier
Mon 6/212:59 amONT - DCA
1 stop8h 01mFrontier
Deal found 4/30$214
This Gotogate deal was found by Cheapflights users on 4/30. 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.
Sat 5/37:45 amIAD - ONT
1 stop26h 39mFrontier
Mon 5/510:52 amONT - IAD
1 stop16h 39mFrontier
Deal found 4/30$216
This Alaska Airlines deal was found by Cheapflights users on 4/30. 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.
Wed 6/49:00 amIAD - ONT
1 stop9h 50mAlaska Airlines
Tue 6/107:20 pmONT - IAD
1 stop9h 16mAlaska Airlines
Deal found 4/30$292
This Hawaiian Airlines deal was found by Cheapflights users on 4/30. 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 Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/39:00 amIAD - ONT
1 stop9h 50mHawaiian Airlines
Tue 6/107:20 pmONT - IAD
1 stop9h 16mHawaiian Airlines
Deal found 4/30$326
This Delta deal was found by Cheapflights users on 5/1. 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.
Wed 6/45:15 pmDCA - ONT
1 stop9h 27mDelta
Tue 6/1011:49 amONT - DCA
1 stop6h 57mDelta
Deal found 5/1$327
This Delta deal was found by Cheapflights users on 4/30. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/47:45 amIAD - ONT
1 stop9h 30mDelta
Sat 6/712:18 pmONT - IAD
1 stop8h 17mDelta
Deal found 4/30$327
This United Airlines deal was found by Cheapflights users on 4/29. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/72:47 pmDCA - ONT
1 stop10h 13mUnited Airlines
Tue 5/136:08 amONT - DCA
1 stop6h 54mUnited Airlines
Deal found 4/29$328
This Southwest deal was found by Cheapflights users on 5/1. 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.
Thu 5/86:55 amDCA - ONT
1 stop7h 10mSouthwest
Mon 5/129:55 amONT - DCA
2 stops9h 15mSouthwest
Deal found 5/1$334
This American Airlines deal was found by Cheapflights users on 5/1. 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.
Fri 5/96:17 amIAD - ONT
2 stops12h 32mAmerican Airlines
Mon 5/1210:51 amONT - IAD
1 stop9h 06mAmerican Airlines
Deal found 5/1$334
This Southwest deal was found by Cheapflights users on 5/1. 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 9/165:45 amIAD - ONT
1 stop6h 50mSouthwest
Tue 10/218:50 amONT - IAD
2 stops11h 15mSouthwest
Deal found 5/1$364
This American Airlines deal was found by Cheapflights users on 4/30. 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.
Sun 6/85:00 amDCA - ONT
1 stop8h 04mAmerican Airlines
Thu 6/1212:59 amONT - DCA
1 stop8h 45mAmerican Airlines
Deal found 4/30$373
This Expedia deal was found by Cheapflights users on 5/1. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/165:06 pmDCA - ONT
1 stop9h 53mMultiple Airlines
Mon 10/2012:59 amONT - DCA
1 stop13h 02mMultiple Airlines
Deal found 5/1$405

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 May 1, 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

Mon 5/12

7:00 am-11:15 am

1 stop7h 15m

Ontario

Fri 5/16

12:16 pm-9:59 pm

1 stop6h 43m

$215

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Thu 5/15

7:31 am-5:45 pm

1 stop13h 14m

Ontario

Tue 5/20

1:08 pm-6:31 am

1 stop14h 23m

$216

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Wed 6/4

9:00 am-3:50 pm

1 stop9h 50m

Ontario

Tue 6/10

7:20 pm-7:36 am

1 stop9h 16m

$292

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Tue 6/3

9:00 am-3:50 pm

1 stop9h 50m

Ontario

Tue 6/10

7:20 pm-7:36 am

1 stop9h 16m

$326

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Wed 6/4

5:15 pm-11:42 pm

1 stop9h 27m

Ontario

Tue 6/10

11:49 am-9:46 pm

1 stop6h 57m

$327

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Wed 6/4

7:45 am-2:15 pm

1 stop9h 30m

Ontario

Sat 6/7

12:18 pm-11:35 pm

1 stop8h 17m

$327

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Thu 5/29

1:59 pm-9:57 pm

2 stops10h 58m

Ontario

Fri 5/30

7:25 pm-8:38 am

2 stops10h 13m

$337

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Tue 9/16

1:55 pm-8:10 pm

1 stop9h 15m

Ontario

Tue 10/21

5:40 am-4:25 pm

1 stop7h 45m

$359

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Tue 9/16

6:05 pm-10:05 pm

1 stop7h 00m

Ontario

Tue 10/21

8:50 am-11:05 pm

2 stops11h 15m

$364

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Sun 6/8

5:00 am-10:04 am

1 stop8h 04m

Ontario

Thu 6/12

12:59 am-12:44 pm

1 stop8h 45m

$373

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/1

Showing 1-10 of 29 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 May 1, 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.

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 May 1, 2025.
Get a feel of what it's like to fly with Alaska Airlines, Southwest and Delta from District of Columbia to Ontario by reading reviews from past customers. In addition to providing an overall rating, users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
9,972 reviews

Boarding

8.1

Crew

8.5

Entertainment

7.1

Food

7.1

Comfort

7.9

Overall

8.0

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
9,972 reviews
Alaska Airlines
8.0
Very good
9,972 reviews

Boarding

8.1

Crew

8.5

Entertainment

7.1

Food

7.1

Comfort

7.9

Overall

8.0

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
4,293 reviews
Alaska Airlines
8.0
Very good
9,972 reviews

Boarding

8.1

Crew

8.5

Entertainment

7.1

Food

7.1

Comfort

7.9

Overall

8.0

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
7,934 reviews
Alaska Airlines
8.0
Very good
9,972 reviews

Boarding

8.1

Crew

8.5

Entertainment

7.1

Food

7.1

Comfort

7.9

Overall

8.0

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
2,409 reviews
Alaska Airlines
8.0
Very good
9,972 reviews

Boarding

8.1

Crew

8.5

Entertainment

7.1

Food

7.1

Comfort

7.9

Overall

8.0

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
8,696 reviews
Alaska Airlines
8.0
Very good
9,972 reviews

Boarding

8.1

Crew

8.5

Entertainment

7.1

Food

7.1

Comfort

7.9

Overall

8.0

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.

  • 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 ($94), Alaska Airlines ($146), and Hawaiian Airlines ($163).

  • 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 May 1, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$150Average$260FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$195Average$484FlexibilityNo cancel feeOn-time69%
DeltaCheapest$286Average$435FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$286Average$473FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$326Average$511FlexibilityNo cancel feeOn-time63%

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