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$65+ 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 11/15. Fares are subject to change and may not be available on all flights or dates of travel.
BWI — ONT
Nov 29 — Dec 61
Sat 11/29
Sat 12/6
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 October 30, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$137
(CheapOair)

One-way from

$65
(Priceline)

Popular in

December

Cheapest in

September

Average price

$367

Good round-trip deal

$407 or less

Good one-way deal

$207 or less
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 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 ($35 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($13 potential savings vs. average RT price).
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Average for round-trip flights in October 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 October 30, 2025.

This CheapOair deal was found by Cheapflights users on 10/30. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/136:19 amPHL - ONT
1 stop7h 51mFrontier
Sun 11/166:53 amONT - PHL
1 stop18h 56mFrontier
Deal found 10/30$144
This CheapOair deal was found by Cheapflights users on 10/28. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/106:19 amPHL - ONT
1 stop7h 51mFrontier
Thu 11/1312:05 pmONT - PHL
1 stop13h 44mFrontier
Deal found 10/28$176
This Kiwi.com deal was found by Cheapflights users on 10/29. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/35:45 amBWI - ONT
1 stop18h 32mMultiple Airlines
Sun 12/72:59 pmONT - BWI
2 stops20h 07mMultiple Airlines
Deal found 10/29$188
This Frontier deal was found by Cheapflights users on 10/29. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/86:19 amPHL - ONT
1 stop7h 51mFrontier
Thu 11/1312:05 pmONT - PHL
1 stop13h 44mFrontier
Deal found 10/29$196
This Frontier deal was found by Cheapflights users on 10/29. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/156:19 amPHL - ONT
1 stop7h 51mFrontier
Thu 11/2012:23 pmONT - PHL
1 stop13h 22mFrontier
Deal found 10/29$206
This CheapOair deal was found by Cheapflights users on 10/28. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/206:00 amPHL - ONT
1 stop8h 11mFrontier
Sat 11/227:08 pmONT - PHL
1 stop6h 42mFrontier
Deal found 10/28$211
This Kiwi.com deal was found by Cheapflights users on 10/29. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/17:20 pmBWI - ONT
1 stop19h 07mMultiple Airlines
Tue 12/236:17 pmONT - BWI
2 stops13h 38mMultiple Airlines
Deal found 10/29$217
This Kiwi.com deal was found by Cheapflights users on 10/30. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/48:30 pmBWI - ONT
1 stop23h 03mMultiple Airlines
Mon 12/82:59 pmONT - BWI
1 stop15h 18mMultiple Airlines
Deal found 10/30$221
This CheapOair deal was found by Cheapflights users on 10/29. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/86:19 amPHL - ONT
1 stop20h 31mFrontier
Wed 11/128:45 amONT - PHL
1 stop17h 04mFrontier
Deal found 10/29$222
This Kiwi.com deal was found by Cheapflights users on 10/30. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/510:27 amBWI - ONT
1 stop10h 07mMultiple Airlines
Sun 12/72:59 pmONT - BWI
2 stops20h 07mMultiple Airlines
Deal found 10/30$226
This Kiwi.com deal was found by Cheapflights users on 10/29. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/48:30 pmBWI - ONT
1 stop23h 03mMultiple Airlines
Wed 12/106:15 amONT - BWI
2 stops25h 04mMultiple Airlines
Deal found 10/29$227
This CheapOair deal was found by Cheapflights users on 10/28. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/206:00 amPHL - ONT
1 stop8h 11mFrontier
Sun 11/3012:58 amONT - PHL
1 stop24h 47mFrontier
Deal found 10/28$231

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 October 30, 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

Thu 12/25

2:00 pm-11:59 pm

1 stop12h 59m

Ontario

Wed 12/31

6:45 am-9:59 pm

1 stop12h 14m

$281

BaltimoreOntario

BWI - ONT

BWIONT

Baltimore/Washington

Tue 1/20

7:14 pm-3:08 pm

1 stop22h 54m

Ontario

Fri 1/23

4:03 pm-6:14 pm

1 stop23h 11m

$294

BaltimoreOntario

BWI - ONT

BWIONT

Baltimore/Washington

Sun 12/7

6:00 am-11:02 am

1 stop8h 02m

Ontario

Sat 12/13

7:05 am-5:14 pm

1 stop7h 09m

$294

BaltimoreOntario

BWI - ONT

BWIONT

Baltimore/Washington

Mon 1/19

4:10 pm-8:58 pm

1 stop7h 48m

Ontario

Fri 1/23

5:05 am-3:04 pm

1 stop6h 59m

$295

BaltimoreOntario

BWI - ONT

BWIONT

Baltimore/Washington

Wed 1/7

4:00 pm-8:45 pm

1 stop7h 45m

Ontario

Sun 1/11

6:30 am-4:10 pm

1 stop6h 40m

$295

BaltimoreOntario

BWI - ONT

BWIONT

Baltimore/Washington

Tue 2/24

6:00 am-11:38 am

1 stop8h 38m

Ontario

Thu 2/26

10:30 pm-9:15 am

1 stop7h 45m

$295

BaltimoreOntario

BWI - ONT

BWIONT

Baltimore/Washington

Mon 1/19

9:17 am-6:20 pm

2 stops12h 03m

Ontario

Fri 1/23

6:27 am-11:21 pm

2 stops13h 54m

$305

BaltimoreOntario

BWI - ONT

BWIONT

Baltimore/Washington

Tue 1/20

3:00 pm-11:58 pm

2 stops11h 58m

Ontario

Fri 1/23

6:00 am-5:48 pm

2 stops8h 48m

$305

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Tue 11/25

8:00 am-3:26 pm

1 stop10h 26m

Ontario

Wed 11/26

12:58 am-4:57 pm

1 stop12h 59m

$313

BaltimoreOntario

BWI - ONT

BWIONT

Baltimore/Washington

Fri 1/30

7:00 am-12:16 pm

1 stop8h 16m

Ontario

Tue 2/10

10:30 pm-9:25 am

1 stop7h 55m

$317

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/30

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 $73). Flying from Maryland to Ontario in December is currently the most expensive (average of $178). 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 October 30, 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. Thursday afternoons 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 8h 02m. Fly via Frontier, Alaska 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 Frontier ($72), Delta ($148), and Southwest ($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. 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 $198. On average you can expect to pay $332. The most popular route, (Washington, D.C. Dulles Intl - Ontario), can usually be booked for $319.

  • 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 $73). Flying from Maryland to Ontario in December is currently the most expensive (average of $178). 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 October 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$188Average$265FlexibilityNo cancel feeOn-time62%
DeltaCheapest$326Average$494FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$336Average$497FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$344Average$502FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$355Average$457FlexibilityNo cancel feeOn-time63%

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