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$92+ Cheap flights from Ontario (ONT) to Maryland

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 1/24. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BWI
oct. 15 — oct. 221
mié. 10/15
mié. 10/22
1 adult, Economy
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Cheap flight deals from Ontario to Maryland

Keep the following information in mind while searching for Ontario to Maryland flight deals. Data was last updated septiembre 15, 2025.

Round-trip from

$164
(CheapOair)

One-way from

$92
(American Airlines)

Popular in

December

Cheapest in

August

Average price

$357

Good round-trip deal

$383 or less

Good one-way deal

$167 or less
From Ontario to Maryland
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One-way flight from Ontario to Maryland
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Highest demand for flights based on searches. 10% potential increase in price ($41 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($9 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 Ontario to Maryland.
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Price to beat on a one-way flight from Ontario to Maryland.
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Find flight deals from Ontario to Maryland

Cheapest flights from Ontario to Maryland
Explore the most affordable flight options available from Ontario to Maryland. Find the lowest fares from popular airlines and budget airlines, with prices last updated on septiembre 15, 2025.

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.
jue. 10/28:59 pmONT - PHL
1 stop24h 58mFrontier
sáb. 10/116:42 amPHL - ONT
1 stop20h 08mFrontier
Deal found 9/14$164
This CheapOair 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 10/306:53 amONT - PHL
1 stop18h 56mFrontier
dom. 11/28:00 amPHL - ONT
1 stop10h 22mFrontier
Deal found 9/14$165
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 11/612:05 pmONT - PHL
1 stop13h 44mFrontier
jue. 11/136:19 amPHL - ONT
1 stop7h 51mFrontier
Deal found 9/15$174
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 10/248:34 amONT - PHL
1 stop14h 07mFrontier
jue. 10/306:19 amPHL - ONT
1 stop7h 51mFrontier
Deal found 9/15$175
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 11/148:24 amONT - BWI
1 stop7h 16mFrontier
dom. 11/169:59 pmBWI - ONT
1 stop11h 58mFrontier
Deal found 9/15$176
This CheapOair 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 9/248:59 pmONT - PHL
1 stop24h 58mFrontier
jue. 10/26:45 amPHL - ONT
1 stop28h 08mFrontier
Deal found 9/14$179
This United Airlines 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 10/185:05 amONT - BWI
1 stop7h 08mUnited Airlines
sáb. 10/254:21 pmBWI - ONT
1 stop7h 03mUnited Airlines
Deal found 9/15$185
This CheapOair 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 10/18:59 pmONT - PHL
1 stop24h 58mFrontier
mié. 10/88:15 amPHL - ONT
1 stop26h 34mFrontier
Deal found 9/15$185
This CheapOair 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 10/94:17 pmONT - PHL
1 stop30h 24mFrontier
dom. 10/1211:30 amPHL - ONT
1 stop23h 19mFrontier
Deal found 9/14$186
This CheapOair 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 9/258:59 pmONT - PHL
1 stop24h 58mFrontier
sáb. 9/276:45 amPHL - ONT
1 stop27h 38mFrontier
Deal found 9/15$194
This American Airlines 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 10/2510:09 amONT - BWI
2 stops11h 24mAmerican Airlines
mar. 10/289:30 amBWI - ONT
2 stops12h 05mAmerican Airlines
Deal found 9/14$195
This CheapOair 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 11/74:05 pmONT - PHL
1 stop9h 44mFrontier
lun. 11/106:19 amPHL - ONT
1 stop20h 31mFrontier
Deal found 9/14$198

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ontario to Maryland 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 15, 2025.
Use the filters below to find and compare flights from Ontario to Maryland that are best for you.

Fly from

Ontario

Fly to

Maryland

Route

Depart

Return

Price

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

mié. 11/12

6:53 am-4:49 am

1 stop18h 56m

Philadelphia

sáb. 11/15

6:19 am-11:50 pm

1 stop20h 31m

$164

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

jue. 10/30

6:53 am-4:49 am

1 stop18h 56m

Philadelphia

mar. 11/4

5:35 pm-11:50 pm

2 stops33h 15m

$210

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

vie. 10/3

8:59 pm-9:59 pm

1 stop22h 00m

Washington, D.C. Reagan-National

lun. 10/6

7:00 am-8:56 pm

2 stops16h 56m

$239

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

jue. 10/23

10:30 am-5:19 am

1 stop15h 49m

Philadelphia

lun. 10/27

6:42 am-11:50 pm

1 stop20h 08m

$247

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

mar. 11/18

6:00 am-7:21 pm

2 stops10h 21m

Baltimore/Washington

lun. 11/24

5:12 pm-10:31 pm

1 stop8h 19m

$250

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

jue. 9/18

8:59 pm-9:59 pm

1 stop22h 00m

Washington, D.C. Reagan-National

mar. 9/23

7:00 am-7:54 pm

1 stop15h 54m

$266

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

vie. 10/10

6:53 am-5:32 pm

1 stop7h 39m

Baltimore/Washington

vie. 10/17

6:17 pm-11:50 pm

1 stop8h 33m

$273

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

lun. 12/8

10:25 pm-11:12 am

1 stop9h 47m

Baltimore/Washington

jue. 12/11

7:15 am-12:22 pm

1 stop8h 07m

$277

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

sáb. 11/8

11:36 am-10:09 pm

1 stop7h 33m

Baltimore/Washington

sáb. 11/15

6:00 am-10:40 am

1 stop7h 40m

$277

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

sáb. 11/8

11:36 am-9:43 pm

1 stop7h 07m

Washington, D.C. Reagan-National

sáb. 11/15

6:00 am-10:40 am

1 stop7h 40m

$277

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 Ontario to Maryland

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

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

Currently, August is the cheapest month in which you can book a flight from Ontario to Maryland (average of $241). Flying from Ontario to Maryland in March is currently the most expensive (average of $290). 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 ONT to MD?

Find hourly flight availability from Ontario to Maryland. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated septiembre 15, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Ontario to Maryland as you normally would.

How much does it cost to fly round-trip from Ontario to Maryland?

Reviews of airlines servicing Maryland

Get insights into the airlines that provide service to Maryland. 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 Maryland. Reviews last updated septiembre 15, 2025.
Read reviews from past customers who have flown Southwest, Delta, and United Airlines from Ontario to Maryland. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,242 reviews

Comfort

8.0

Food

7.0

Overall

8.0

Boarding

8.1

Crew

8.6

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Southwest
8.0
Very good
4,242 reviews
Southwest
8.0
Very good
4,242 reviews

Comfort

8.0

Food

7.0

Overall

8.0

Boarding

8.1

Crew

8.6

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Delta
8.0
Very good
7,954 reviews
Southwest
8.0
Very good
4,242 reviews

Comfort

8.0

Food

7.0

Overall

8.0

Boarding

8.1

Crew

8.6

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
United Airlines
7.4
Good
8,929 reviews
Southwest
8.0
Very good
4,242 reviews

Comfort

8.0

Food

7.0

Overall

8.0

Boarding

8.1

Crew

8.6

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,242 reviews

Comfort

8.0

Food

7.0

Overall

8.0

Boarding

8.1

Crew

8.6

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Frontier
5.8
Fair
3,172 reviews
Southwest
8.0
Very good
4,242 reviews

Comfort

8.0

Food

7.0

Overall

8.0

Boarding

8.1

Crew

8.6

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.

Related info for your journey

Find useful and relevant information for your journey from Ontario to Maryland. 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 from for flights from Ontario to Maryland?

    Located just 3.1 mi from the city center, Ontario (ONT) is the airport most travelers will use when flying to Maryland from Ontario.

  • How popular is this Ontario to Maryland flight route?

    This flight path from Ontario to Maryland was viewed by 5 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 Ontario to Maryland?

    Frontier, United Airlines, and Delta can get you from Ontario to Maryland in just under 9h 47m. Your travel time can differ by up to 9h 09m. There are 2276 mi between Ontario and Maryland. This flight may include one or multiple stops.

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

    For one-way options, check prices for United Airlines. According to our data, you can fly for as low as $93. Users have also found prices from $103 and $130 on Frontier and American Airlines, respectively.

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

    The most popular flight routes from Ontario to Maryland are Ontario - Washington, D.C. Dulles Intl, Ontario - Philadelphia and Ontario - Washington, D.C. Reagan-National.

  • What are the cheapest flights from Ontario to Maryland?

    The cheapest flight price from Ontario to Maryland is $145. On average you can expect to pay $320. The most popular route, (Ontario - Washington, D.C. Dulles Intl), can usually be booked for $237.

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

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

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

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

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

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

    Currently, August is the cheapest month in which you can book a flight from Ontario to Maryland (average of $241). Flying from Ontario to Maryland in March is currently the most expensive (average of $290). 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.

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Alternative routes for Ontario to Maryland

See prices for flight routes from nearby airports that may be better suited for you.
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Top 6 airlines flying from Ontario to Maryland

Discover the top 6 airlines that operate flights from Ontario to Maryland. 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 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$98Average$212FlexibilityNo cancel feeOn-time65%
FrontierCheapest$148Average$218FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$296Average$472FlexibilityNo cancel feeOn-time69%
DeltaCheapest$326Average$450FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$339Average$462FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$346Average$547FlexibilityNo cancel feeOn-time71%

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