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Ontario

$61+ Cheap flights from Maryland 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 1/13. Fares are subject to change and may not be available on all flights or dates of travel.
BWI — ONT
Jan 17 — Jan 241
Sat 1/17
Sat 1/24
1 adult, Economy
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Cheap flight deals from Maryland to Ontario

Cheapest flights from Maryland to Ontario
Explore the most affordable flight options available from Maryland to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 18, 2025.

This Mytrip 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/258:36 pmPHL - ONT
1 stop30h 23mFrontier
Wed 12/316:00 amONT - PHL
1 stop20h 40mFrontier
Deal found 12/16$252
This CheapOair 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/229:30 pmBWI - ONT
1 stop12h 54mFrontier
Wed 12/246:20 pmONT - BWI
1 stop14h 24mFrontier
Deal found 12/16$254
This CheapOair 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/219:08 pmBWI - ONT
1 stop13h 16mFrontier
Wed 12/246:20 pmONT - BWI
1 stop14h 24mFrontier
Deal found 12/16$268
This CheapOair 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/219:08 pmBWI - ONT
1 stop13h 16mFrontier
Wed 12/316:20 pmONT - BWI
1 stop14h 24mFrontier
Deal found 12/16$269
This CheapOair 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/258:36 pmPHL - ONT
1 stop30h 23mFrontier
Mon 12/296:45 amONT - PHL
1 stop19h 46mFrontier
Deal found 12/16$279
This CheapOair 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/197:30 amPHL - ONT
1 stop13h 00mFrontier
Tue 12/236:00 amONT - PHL
1 stop20h 40mFrontier
Deal found 12/16$283
This CheapOair 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/219:08 pmBWI - ONT
1 stop13h 16mFrontier
Fri 1/98:31 amONT - BWI
1 stop9h 33mFrontier
Deal found 12/16$303
This CheapOair 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/229:30 pmBWI - ONT
1 stop12h 54mFrontier
Mon 12/296:20 pmONT - BWI
1 stop14h 09mFrontier
Deal found 12/16$305
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.
Thu 12/258:36 pmPHL - ONT
1 stop30h 23mFrontier
Tue 12/308:19 amONT - PHL
1 stop14h 05mFrontier
Deal found 12/17$305
This CheapOair 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/197:30 amPHL - ONT
1 stop13h 00mFrontier
Thu 12/256:00 amONT - PHL
1 stop20h 40mFrontier
Deal found 12/16$308
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.
Thu 12/258:36 pmPHL - ONT
1 stop30h 23mFrontier
Sun 12/286:37 pmONT - PHL
1 stop8h 03mFrontier
Deal found 12/17$309
This CheapOair 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/318:00 amDCA - ONT
1 stop18h 59mFrontier
Mon 1/56:45 amONT - DCA
1 stop12h 14mFrontier
Deal found 12/16$309

Find flight deals from Maryland to Ontario

Keep the following information in mind while searching for Maryland to Ontario flight deals. Data was last updated December 18, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$147
(Trip.com)

One-way from

$61
(Trip.com)

Popular in

December

Cheapest in

September

Average price

$507

Good one-way deal

$306 or less
Provider with most accurate pricing for Washington, D.C. (WAS)-Los Angeles flight deals.
Search Deals
Provider most trusted by Cheapflights users for Washington, D.C. (WAS)-Los Angeles flights.
Search Deals
From Maryland to Ontario
Search Deals
One-way flight from Maryland to Ontario
Search Deals
Highest demand for flights based on searches. 11% potential increase in price ($45 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($15 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals
Price to beat on a one-way flight from Maryland to Ontario.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Maryland 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, 2025.
Use the filters below to find and compare flights from Maryland to Ontario that are best for you.

Fly from

Maryland

Fly to

Ontario

Route

Depart

Return

Price

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Tue 2/10

1:00 pm-9:34 pm

1 stop11h 34m

Ontario

Wed 2/11

7:30 am-9:59 pm

1 stop11h 29m

$148

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Sat 2/21

6:00 pm-7:59 am

1 stop16h 59m

Ontario

Tue 2/24

7:30 am-1:15 pm

1 stop26h 45m

$149

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Wed 1/7

6:00 pm-11:14 pm

1 stop8h 14m

Ontario

Wed 1/14

7:15 am-9:59 pm

1 stop11h 44m

$158

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Thu 1/22

2:00 pm-12:20 am

1 stop13h 20m

Ontario

Wed 1/28

7:15 am-4:59 pm

1 stop6h 44m

$165

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Sat 2/7

2:00 pm-11:24 pm

1 stop12h 24m

Ontario

Sat 2/14

6:00 am-9:59 pm

1 stop12h 59m

$165

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Wed 1/28

8:59 am-3:07 pm

1 stop9h 08m

Ontario

Wed 2/11

7:30 am-9:59 pm

1 stop11h 29m

$165

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Thu 2/5

6:00 pm-12:20 am

1 stop9h 20m

Ontario

Sat 2/7

7:15 am-9:59 pm

1 stop11h 44m

$182

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Fri 1/30

2:00 pm-12:20 am

1 stop13h 20m

Ontario

Tue 2/10

7:30 am-9:59 pm

1 stop11h 29m

$200

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Sat 1/10

2:00 pm-11:14 pm

1 stop12h 14m

Ontario

Tue 1/13

7:15 am-9:59 pm

1 stop11h 44m

$203

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Thu 2/19

6:00 pm-11:59 pm

1 stop8h 59m

Ontario

Wed 2/25

7:30 am-9:59 pm

1 stop11h 29m

$203

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/17

Showing 1-10 of 60 results
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Best time to book a flight from Maryland to Ontario

Have a flexible travel schedule? Discover the best time to fly to Ontario from Maryland 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 Maryland to Ontario

What is the cheapest month to book a flight from Maryland to Ontario?

Currently, January is the cheapest month in which you can book a flight from Maryland to Ontario (average of $70). Flying from Maryland to Ontario in December is currently the most expensive (average of $168). 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 MD to ONT?

Find hourly flight availability from Maryland 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, 2025.

Unlike at noon, when flights are generally more expensive, you can save up to 36% on flights from Maryland to Ontario by exploring options for tickets in the morning.

What is the cheapest day to fly from Maryland to Ontario?

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

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

Related info for your journey

Find useful and relevant information for your journey from Maryland 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 Maryland?

    Most people fly into Ontario (ONT) if they book a flight to Ontario from Maryland. Ontario is conveniently located just 3.1 mi from Ontario’s city center.

  • How popular is this Maryland to Ontario flight route?

    This flight path from Maryland to Ontario was viewed by 1 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

  • How long is the flight from Maryland to Ontario?

    There are many flights that can get you from Maryland to Ontario in 9h 26m. Fly via Frontier, Alaska Airlines, or Delta to get the fastest option. There are 2236 mi between Maryland and Ontario. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What are the cheapest airlines to fly from Maryland to Ontario one-way?

    The cheapest airlines for a one-way flight from Maryland to Ontario are Frontier ($65), United Airlines ($129), and Delta ($163).

  • What are the most popular routes from Maryland to Ontario?

    When deciding which route to take from Maryland to Ontario consider Washington, D.C. Reagan-National - Ontario, Washington, D.C. Dulles Intl - Ontario or Baltimore/Washington - Ontario as they are the most popular.

  • What are the cheapest flights from Maryland to Ontario?

    The cheapest flight price from Maryland to Ontario is $291. On average you can expect to pay $448. The most popular route, (Washington, D.C. Reagan-National - Ontario), can usually be booked for $124.

  • Can I find deals for flights from Maryland to Ontario that include hotel bookings?

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

  • How can I find direct flights from Maryland to Ontario?

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

  • Can I find deals for business class flights from Maryland to Ontario?

    Yes. Cheapflights offers flight deals from Maryland 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 Maryland to Ontario?

    Currently, January is the cheapest month in which you can book a flight from Maryland to Ontario (average of $70). Flying from Maryland to Ontario in December is currently the most expensive (average of $168). 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 Maryland to Ontario

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Top 5 airlines flying from Maryland to Ontario

Discover the top 5 airlines that operate flights from Maryland 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, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$188Average$265FlexibilityNo cancel feeOn-time62%
DeltaCheapest$326Average$586FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$336Average$497FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$344Average$468FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$346Average$463FlexibilityNo cancel feeOn-time63%

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