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Ontario

$88+ 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 11/3. Fares are subject to change and may not be available on all flights or dates of travel.
BWI — ONT
Oct 16 — Oct 231
Thu 10/16
Thu 10/23
1 adult, Economy
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Cheap flight deals from Maryland to Ontario

Keep the following information in mind while searching for Maryland to Ontario flight deals. Data was last updated September 16, 2025.

Round-trip from

$162
(Booking.com)

One-way from

$88
(United Airlines)

Popular in

December

Cheapest in

August

Average price

$327

Good round-trip deal

$381 or less

Good one-way deal

$176 or less
From Maryland to Ontario
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One-way flight from Maryland 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 September 2025
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Price to beat on a round-trip flight from Maryland to Ontario.
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Price to beat on a one-way flight from Maryland to Ontario.
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Find 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 September 16, 2025.

This Booking.com deal was found by Cheapflights users on 9/13. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/2810:17 amIAD - ONT
1 stop8h 07mFrontier
Sun 10/57:15 pmONT - IAD
1 stop11h 02mFrontier
Deal found 9/13$162
This Booking.com deal was found by Cheapflights users on 9/14. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/210:17 amIAD - ONT
1 stop8h 22mFrontier
Sun 10/54:09 pmONT - IAD
1 stop14h 08mFrontier
Deal found 9/14$163
This Mytrip deal was found by Cheapflights users on 9/14. 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.
Fri 10/316:19 amPHL - ONT
1 stop20h 31mFrontier
Sun 11/25:53 amONT - PHL
1 stop18h 56mFrontier
Deal found 9/14$164
This Gotogate deal was found by Cheapflights users on 9/16. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/249:42 pmBWI - ONT
1 stop13h 07mFrontier
Sun 10/266:53 amONT - BWI
1 stop7h 51mFrontier
Deal found 9/16$165
This Booking.com deal was found by Cheapflights users on 9/13. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/236:42 amPHL - ONT
1 stop20h 08mFrontier
Fri 10/316:53 amONT - PHL
1 stop18h 56mFrontier
Deal found 9/13$165
This Booking.com deal was found by Cheapflights users on 9/14. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/36:27 pmBWI - ONT
1 stop28h 27mFrontier
Sun 10/58:59 pmONT - BWI
1 stop17h 43mFrontier
Deal found 9/14$166
This Booking.com deal was found by Cheapflights users on 9/15. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/249:42 pmBWI - ONT
1 stop13h 07mFrontier
Mon 10/276:53 amONT - BWI
1 stop7h 51mFrontier
Deal found 9/15$167
This Mytrip deal was found by Cheapflights users on 9/14. 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.
Wed 10/11:00 pmDCA - ONT
1 stop9h 54mFrontier
Tue 10/147:04 amONT - DCA
1 stop26h 00mFrontier
Deal found 9/14$167
This Booking.com deal was found by Cheapflights users on 9/16. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/309:58 pmBWI - ONT
1 stop12h 31mFrontier
Mon 11/38:24 amONT - BWI
1 stop7h 34mFrontier
Deal found 9/16$168
This Gotogate deal was found by Cheapflights users on 9/14. 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 11/12:00 pmDCA - ONT
1 stop12h 50mFrontier
Sat 11/86:53 amONT - DCA
1 stop7h 06mFrontier
Deal found 9/14$168
This Booking.com deal was found by Cheapflights users on 9/13. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/287:00 amDCA - ONT
1 stop27h 53mFrontier
Sun 10/58:59 pmONT - DCA
1 stop12h 11mFrontier
Deal found 9/13$169
This Gotogate deal was found by Cheapflights users on 9/14. 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.
Thu 9/2510:17 amIAD - ONT
1 stop8h 12mFrontier
Thu 10/24:34 pmONT - IAD
1 stop13h 43mFrontier
Deal found 9/14$174

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 September 16, 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

BaltimoreOntario

BWI - ONT

BWIONT

Baltimore/Washington

Sat 10/25

4:21 pm-8:24 pm

1 stop7h 03m

Ontario

Wed 11/19

6:38 pm-9:59 am

2 stops12h 21m

$190

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Thu 10/2

1:00 pm-7:54 pm

1 stop9h 54m

Ontario

Sun 10/5

8:59 pm-12:10 pm

1 stop12h 11m

$208

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Sat 9/27

1:00 pm-7:54 pm

1 stop9h 54m

Ontario

Sun 9/28

8:59 pm-12:10 pm

1 stop12h 11m

$231

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Thu 10/16

1:07 pm-9:35 am

2 stops23h 28m

Ontario

Thu 10/23

6:53 am-11:29 pm

2 stops13h 36m

$231

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Sat 11/8

6:00 pm-11:50 pm

1 stop8h 50m

Ontario

Sat 11/15

8:00 am-9:59 pm

2 stops10h 59m

$232

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Thu 9/25

6:00 pm-7:53 am

1 stop16h 53m

Ontario

Mon 9/29

8:59 pm-9:59 pm

1 stop22h 00m

$233

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Thu 10/30

6:37 pm-11:10 am

2 stops43h 33m

Ontario

Wed 11/5

6:53 am-11:39 am

2 stops25h 46m

$237

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Tue 10/28

6:31 pm-11:50 pm

1 stop8h 19m

Ontario

Sun 11/2

4:17 pm-12:04 pm

2 stops16h 47m

$245

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Fri 10/3

6:31 pm-7:54 pm

1 stop28h 23m

Ontario

Mon 10/6

4:08 pm-4:59 pm

1 stop21h 51m

$265

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Fri 9/26

1:00 pm-7:54 pm

1 stop9h 54m

Ontario

Mon 9/29

9:46 pm-9:59 pm

2 stops21h 13m

$272

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/13

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, August is the cheapest month in which you can book a flight from Maryland to Ontario (average of $246). Flying from Maryland to Ontario in March is currently the most expensive (average of $327). 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 September 16, 2025.

When flying from Maryland to Ontario, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

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 7h 03m. Fly via United Airlines, Frontier, or Delta to get the fastest option. There are 2276 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 United Airlines ($93), Delta ($139), and Hawaiian Airlines ($158).

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

    When deciding which route to take from Maryland to Ontario consider Washington, D.C. Dulles Intl - Ontario, Baltimore/Washington - Ontario or Washington, D.C. Reagan-National - 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 $160. On average you can expect to pay $284. The most popular route, (Washington, D.C. Dulles Intl - Ontario), can usually be booked for $162.

  • 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, August is the cheapest month in which you can book a flight from Maryland to Ontario (average of $246). Flying from Maryland to Ontario in March is currently the most expensive (average of $327). 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

See prices for flight routes from nearby airports that may be better suited for you.
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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 September 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$188Average$248FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$218Average$502FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$326Average$457FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$336Average$506FlexibilityNo cancel feeOn-time71%
DeltaCheapest$346Average$461FlexibilityNo cancel feeOn-timeN/A

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