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Ontario

$47+ 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 10/1. Fares are subject to change and may not be available on all flights or dates of travel.
BWI — ONT
oct. 17 — oct. 241
vie. 10/17
vie. 10/24
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 septiembre 17, 2025.

Round-trip from

$163
(Booking.com)

One-way from

$47
(Trip.com)

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 septiembre 17, 2025.

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.
jue. 10/210:17 amIAD - ONT
1 stop8h 22mFrontier
dom. 10/54:09 pmONT - IAD
1 stop14h 08mFrontier
Deal found 9/14$163
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.
vie. 10/249:42 pmBWI - ONT
1 stop13h 07mFrontier
dom. 10/266:53 amONT - BWI
1 stop7h 51mFrontier
Deal found 9/16$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.
jue. 10/236:42 amPHL - ONT
1 stop20h 08mFrontier
jue. 10/306:53 amONT - PHL
1 stop18h 56mFrontier
Deal found 9/14$165
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.
vie. 10/36:27 pmBWI - ONT
1 stop28h 27mFrontier
dom. 10/58:59 pmONT - BWI
1 stop17h 43mFrontier
Deal found 9/16$166
This Booking.com deal was found by Cheapflights users on 9/17. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 11/78:00 amPHL - ONT
1 stop13h 28mFrontier
dom. 11/96:45 amONT - PHL
1 stop19h 04mFrontier
Deal found 9/17$166
This Gotogate 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 10/17:00 amDCA - ONT
1 stop27h 23mFrontier
sáb. 10/48:59 pmONT - DCA
1 stop12h 11mFrontier
Deal found 9/15$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.
jue. 10/309:58 pmBWI - ONT
1 stop12h 31mFrontier
lun. 11/38:24 amONT - BWI
1 stop7h 34mFrontier
Deal found 9/16$168
This Flybillet 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 Flybillet is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 11/16:00 pmDCA - ONT
1 stop8h 50mFrontier
sáb. 11/86:53 amONT - DCA
1 stop12h 06mFrontier
Deal found 9/15$168
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.
mié. 10/157:00 amDCA - ONT
1 stop29h 35mFrontier
mar. 10/217:04 amONT - DCA
1 stop6h 55mFrontier
Deal found 9/15$169
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 10/249:42 pmBWI - ONT
1 stop13h 07mFrontier
lun. 11/38:24 amONT - BWI
1 stop7h 34mFrontier
Deal found 9/16$176
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 10/176:31 pmDCA - ONT
1 stop8h 19mFrontier
jue. 10/236:53 amONT - DCA
1 stop12h 06mFrontier
Deal found 9/14$177
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.
jue. 9/258:10 amPHL - ONT
1 stop10h 19mFrontier
mié. 10/18:59 pmONT - PHL
1 stop24h 58mFrontier
Deal found 9/15$180

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 septiembre 17, 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

vie. 10/17

6:31 pm-11:50 pm

1 stop8h 19m

Ontario

sáb. 10/25

7:04 am-4:59 pm

1 stop6h 55m

$177

BaltimoreOntario

BWI - ONT

BWIONT

Baltimore/Washington

mar. 1/6

4:10 pm-8:58 pm

1 stop7h 48m

Ontario

lun. 1/12

6:39 pm-7:32 am

1 stop9h 53m

$229

BaltimoreOntario

BWI - ONT

BWIONT

Baltimore/Washington

sáb. 2/21

7:00 am-11:38 am

1 stop7h 38m

Ontario

lun. 3/2

10:30 pm-10:17 am

1 stop8h 47m

$277

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

mar. 2/24

5:15 pm-11:52 pm

1 stop9h 37m

Ontario

sáb. 2/28

10:30 pm-9:14 am

1 stop7h 44m

$277

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

vie. 10/31

7:35 am-2:01 pm

1 stop9h 26m

Ontario

mar. 11/4

11:48 am-12:40 am

1 stop9h 52m

$277

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

mar. 10/14

7:35 am-5:10 pm

1 stop12h 35m

Ontario

mié. 10/15

11:48 am-12:40 am

1 stop9h 52m

$277

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

mar. 10/14

7:35 am-5:10 pm

1 stop12h 35m

Ontario

vie. 10/17

10:00 pm-10:11 am

1 stop9h 11m

$277

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

jue. 10/30

6:15 am-12:16 pm

1 stop9h 01m

Ontario

mar. 11/4

11:48 am-12:40 am

1 stop9h 52m

$277

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

mar. 2/24

7:00 am-11:38 am

1 stop7h 38m

Ontario

jue. 2/26

10:30 pm-9:11 am

1 stop7h 41m

$277

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

sáb. 11/1

6:00 am-10:26 am

1 stop7h 26m

Ontario

sáb. 11/8

11:36 am-9:43 pm

1 stop7h 07m

$278

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/15

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 septiembre 17, 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 38m. Fly via Frontier, United Airlines, 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 Delta ($139), United Airlines ($142), 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 $188.

  • 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 septiembre 17, 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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