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$133+ 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 9/19. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BWI
Jun 17 — Jun 241
Tue 6/17
Tue 6/24
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 June 12, 2025.

Round-trip from

$215
(Frontier)

One-way from

$133
(FlightHub)

Popular in

December

Cheapest in

August

Average price

$382

Good round-trip deal

$383 or less

Good one-way deal

$168 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. 11% potential increase in price ($43 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($10 potential savings vs. average RT price).
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Average for round-trip flights in June 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 June 12, 2025.

This Frontier deal was found by Cheapflights users on 6/12. 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.
Thu 8/75:14 pmONT - PHL
1 stop9h 35mFrontier
Mon 8/117:19 amPHL - ONT
1 stop7h 34mFrontier
Deal found 6/12$215
This Frontier deal was found by Cheapflights users on 6/11. 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.
Wed 7/97:22 pmONT - IAD
1 stop8h 12mFrontier
Tue 7/157:30 amIAD - ONT
1 stop11h 50mFrontier
Deal found 6/11$255
This Kiwi.com deal was found by Cheapflights users on 6/10. 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 8/2112:59 amONT - DCA
1 stop8h 12mFrontier
Wed 8/271:00 pmDCA - ONT
1 stop13h 50mFrontier
Deal found 6/10$263
This Alaska Airlines deal was found by Cheapflights users on 6/9. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/183:04 pmONT - PHL
1 stop11h 56mAlaska Airlines
Tue 9/236:58 pmPHL - ONT
1 stop18h 46mAlaska Airlines
Deal found 6/9$296
This American Airlines deal was found by Cheapflights users on 6/11. 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.
Mon 8/411:59 pmONT - PHL
1 stop9h 56mAmerican Airlines
Wed 8/137:15 amPHL - ONT
1 stop7h 17mAmerican Airlines
Deal found 6/11$297
This Southwest deal was found by Cheapflights users on 6/11. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/49:20 pmONT - BWI
Nonstop4h 50mSouthwest
Mon 8/119:20 amBWI - ONT
Nonstop5h 15mSouthwest
Deal found 6/11$297
This American Airlines deal was found by Cheapflights users on 6/11. 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.
Thu 8/2812:47 pmONT - DCA
1 stop9h 18mAmerican Airlines
Tue 9/29:29 amDCA - ONT
1 stop9h 37mAmerican Airlines
Deal found 6/11$297
This Alaska Airlines deal was found by Cheapflights users on 6/9. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/57:22 pmONT - IAD
1 stop9h 10mAlaska Airlines
Mon 9/86:09 pmIAD - ONT
1 stop19h 35mAlaska Airlines
Deal found 6/9$297
This American Airlines deal was found by Cheapflights users on 6/11. 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.
Thu 8/711:59 pmONT - IAD
1 stop8h 02mAmerican Airlines
Sun 8/106:27 amIAD - ONT
1 stop8h 26mAmerican Airlines
Deal found 6/11$298
This Delta deal was found by Cheapflights users on 6/9. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/189:55 amONT - PHL
2 stops10h 08mDelta
Tue 9/2312:35 pmPHL - ONT
1 stop10h 07mDelta
Deal found 6/9$302
This Frontier deal was found by Cheapflights users on 6/11. 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.
Sun 8/312:59 amONT - BWI
1 stop12h 32mFrontier
Mon 8/115:26 pmBWI - ONT
1 stop9h 24mFrontier
Deal found 6/11$303
This Delta deal was found by Cheapflights users on 6/10. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/2210:00 pmONT - DCA
2 stops14h 00mDelta
Mon 8/253:50 pmDCA - ONT
2 stops9h 50mDelta
Deal found 6/10$308

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 June 12, 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

Thu 8/7

5:14 pm-5:49 am

1 stop9h 35m

Philadelphia

Mon 8/11

7:19 am-11:53 am

1 stop7h 34m

$215

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Wed 7/9

7:22 pm-6:34 am

1 stop8h 12m

Washington, D.C. Dulles Intl

Tue 7/15

7:30 am-4:20 pm

1 stop11h 50m

$255

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Thu 8/21

12:59 am-12:11 pm

1 stop8h 12m

Washington, D.C. Reagan-National

Wed 8/27

1:00 pm-11:50 pm

1 stop13h 50m

$263

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Thu 9/18

3:04 pm-6:00 am

1 stop11h 56m

Philadelphia

Tue 9/23

6:58 pm-10:44 am

1 stop18h 46m

$296

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Mon 8/4

11:59 pm-12:55 pm

1 stop9h 56m

Philadelphia

Wed 8/13

7:15 am-11:32 am

1 stop7h 17m

$297

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Mon 8/4

9:20 pm-5:10 am

Nonstop4h 50m

Baltimore/Washington

Mon 8/11

9:20 am-11:35 am

Nonstop5h 15m

$297

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Thu 8/28

12:47 pm-1:05 am

1 stop9h 18m

Washington, D.C. Reagan-National

Tue 9/2

9:29 am-4:06 pm

1 stop9h 37m

$297

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Fri 9/5

7:22 pm-7:32 am

1 stop9h 10m

Washington, D.C. Dulles Intl

Mon 9/8

6:09 pm-10:44 am

1 stop19h 35m

$297

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Thu 8/7

11:59 pm-11:01 am

1 stop8h 02m

Washington, D.C. Dulles Intl

Sun 8/10

6:27 am-11:53 am

1 stop8h 26m

$298

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Thu 9/18

9:55 am-11:03 pm

2 stops10h 08m

Philadelphia

Tue 9/23

12:35 pm-7:42 pm

1 stop10h 07m

$302

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/10

Showing 1-10 of 53 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 June 12, 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.

Weekly flight availability from Ontario to Maryland

Explore weekly flight availability from Ontario to Maryland. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated June 12, 2025.

The most flights from ONT to USMD are scheduled on a Monday (1 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (1 on average).

Rainfall in Maryland by month

Plan your trip to Maryland by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Maryland ranges from 2.9 - 4.1 inches per month. July is typically the wettest month, when rainfall can reach 4.1 in. February is typically the driest time to visit Maryland when rainfall is around 2.9 in.

Temperature in Maryland by month

Plan your trip to Maryland by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Maryland, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 77.0 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 33.8 F).

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 June 12, 2025.
Peruse reviews from past customers who have flown with Alaska Airlines, Southwest and Delta from Ontario to Maryland to help guide your decision. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Crew

8.5

Overall

8.0

Comfort

7.8

Boarding

8.1

Food

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Crew

8.5

Overall

8.0

Comfort

7.8

Boarding

8.1

Food

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Southwest
8.0
Very good
4,287 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Crew

8.5

Overall

8.0

Comfort

7.8

Boarding

8.1

Food

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Delta
8.0
Very good
7,950 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Crew

8.5

Overall

8.0

Comfort

7.8

Boarding

8.1

Food

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Hawaiian Airlines
7.9
Good
2,494 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Crew

8.5

Overall

8.0

Comfort

7.8

Boarding

8.1

Food

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
United Airlines
7.4
Good
8,790 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Crew

8.5

Overall

8.0

Comfort

7.8

Boarding

8.1

Food

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

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 1 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

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

    For one-way options, check prices for Frontier. According to our data, you can fly for as low as $133. Users have also found prices from $147 and $149 on Hawaiian Airlines and Delta, 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 - Baltimore/Washington.

  • What are the cheapest flights from Ontario to Maryland?

    The cheapest flight price from Ontario to Maryland is $153. On average you can expect to pay $307. The most popular route, (Ontario - Washington, D.C. Dulles Intl), can usually be booked for $265.

  • 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.

See more FAQs

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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 June 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$130Average$191FlexibilityNo cancel feeOn-time65%
FrontierCheapest$148Average$234FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$256Average$449FlexibilityNo cancel feeOn-time69%
DeltaCheapest$296Average$452FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$296Average$574FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$330Average$452FlexibilityNo cancel feeOn-time63%

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