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$83+ 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 4/30. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BWI
avr. 20 — avr. 271
dim. 4/20
dim. 4/27
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 avril 15, 2025.

Most accurate provider

Mytrip
3 stars

Most trusted provider

Mytrip
3 stars

Round-trip from

$176
(Cheapflightsfares)

One-way from

$83
(Cheapflightsfares)

Popular in

December

Cheapest in

August

Average price

$357

Good round-trip deal

$372 or less

Good one-way deal

$188 or less
Provider with most accurate pricing for Los Angeles-Washington, D.C. (WAS) flight deals.
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Provider most trusted by Cheapflights users for Los Angeles-Washington, D.C. (WAS) flights.
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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 ($40 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($8 potential savings vs. average RT price).
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Average for round-trip flights in April 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 avril 15, 2025.

This Cheapflightsfares deal was found by Cheapflights users on 4/15. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 4/2212:10 pmONT - DCA
1 stop6h 49mFrontier
sam. 4/267:00 amDCA - ONT
1 stop7h 20mFrontier
Deal found 4/15$176
This Mytrip deal was found by Cheapflights users on 4/15. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sam. 5/101:15 pmONT - IAD
1 stop14h 16mFrontier
sam. 5/177:45 amIAD - ONT
1 stop26h 39mFrontier
Deal found 4/15$178
This CheapOair deal was found by Cheapflights users on 4/15. 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.
mer. 4/163:17 pmONT - PHL
1 stop10h 58mFrontier
mar. 4/226:45 pmPHL - ONT
1 stop18h 08mFrontier
Deal found 4/15$180
This CheapOair deal was found by Cheapflights users on 4/14. 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.
mar. 4/153:17 pmONT - BWI
1 stop22h 11mFrontier
mer. 4/168:49 pmBWI - ONT
1 stop13h 40mFrontier
Deal found 4/14$180
This Expedia deal was found by Cheapflights users on 4/14. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mer. 5/76:00 amONT - BWI
1 stop9h 05mMultiple Airlines
lun. 5/126:12 pmBWI - ONT
1 stop8h 47mMultiple Airlines
Deal found 4/14$282
This Alaska Airlines deal was found by Cheapflights users on 4/15. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 4/296:00 amONT - IAD
1 stop9h 13mAlaska Airlines
mar. 9/307:00 amIAD - ONT
1 stop10h 06mAlaska Airlines
Deal found 4/15$295
This Delta deal was found by Cheapflights users on 4/14. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mer. 5/146:00 amONT - PHL
1 stop8h 38mDelta
mar. 5/205:30 amPHL - ONT
1 stop8h 38mDelta
Deal found 4/14$307
This United Airlines deal was found by Cheapflights users on 4/15. 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.
mer. 5/287:00 amONT - DCA
1 stop8h 02mUnited Airlines
mar. 6/35:00 pmDCA - ONT
1 stop8h 26mUnited Airlines
Deal found 4/15$322
This Hawaiian Airlines deal was found by Cheapflights users on 4/14. 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 Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jeu. 5/811:46 amONT - IAD
1 stop9h 37mHawaiian Airlines
mar. 5/136:30 amIAD - ONT
1 stop12h 02mHawaiian Airlines
Deal found 4/14$326
This American Airlines deal was found by Cheapflights users on 4/15. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mer. 5/72:44 pmONT - DCA
1 stop7h 02mAmerican Airlines
jeu. 5/811:54 amDCA - ONT
1 stop9h 42mAmerican Airlines
Deal found 4/15$327
This Delta deal was found by Cheapflights users on 4/15. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sam. 5/101:10 pmONT - IAD
1 stop7h 43mDelta
mar. 6/103:31 pmIAD - ONT
1 stop9h 54mDelta
Deal found 4/15$327
This Delta deal was found by Cheapflights users on 4/15. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mer. 5/76:00 amONT - DCA
2 stops8h 59mDelta
jeu. 5/86:59 amDCA - ONT
1 stop7h 09mDelta
Deal found 4/15$332

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 avril 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

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

sam. 4/26

12:10 pm-9:59 pm

1 stop6h 49m

Washington, D.C. Reagan-National

mar. 4/29

7:00 am-11:20 am

1 stop7h 20m

$176

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

sam. 5/10

1:15 pm-6:31 am

1 stop14h 16m

Washington, D.C. Dulles Intl

sam. 5/17

7:45 am-7:24 am

1 stop26h 39m

$178

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

mer. 5/7

1:08 pm-6:52 am

1 stop14h 44m

Philadelphia

sam. 5/10

6:54 pm-1:16 pm

1 stop21h 22m

$180

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

jeu. 5/1

12:59 am-5:22 pm

1 stop13h 23m

Baltimore/Washington

lun. 5/5

6:12 pm-11:59 pm

1 stop8h 47m

$198

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

mer. 5/7

6:00 am-6:05 pm

1 stop9h 05m

Baltimore/Washington

lun. 5/12

6:12 pm-11:59 pm

1 stop8h 47m

$282

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

mar. 4/29

6:00 am-6:13 pm

1 stop9h 13m

Washington, D.C. Dulles Intl

mar. 5/6

6:30 am-3:32 pm

1 stop12h 02m

$295

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

mer. 5/14

6:00 am-5:38 pm

1 stop8h 38m

Philadelphia

mar. 5/20

5:30 am-11:08 am

1 stop8h 38m

$307

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

mer. 5/28

7:00 am-6:02 pm

1 stop8h 02m

Washington, D.C. Reagan-National

mar. 6/3

5:00 pm-10:26 pm

1 stop8h 26m

$322

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

jeu. 5/8

11:46 am-12:23 am

1 stop9h 37m

Washington, D.C. Dulles Intl

mar. 5/13

6:30 am-3:32 pm

1 stop12h 02m

$326

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

mer. 5/7

2:44 pm-12:46 am

1 stop7h 02m

Washington, D.C. Reagan-National

jeu. 5/8

11:54 am-6:36 pm

1 stop9h 42m

$327

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/15

Showing 1-10 of 58 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 avril 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.

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 avril 15, 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
9,871 reviews

Comfort

7.9

Crew

8.5

Entertainment

7.1

Food

7.1

Boarding

8.2

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Alaska Airlines
8.0
Very good
9,871 reviews
Alaska Airlines
8.0
Very good
9,871 reviews

Comfort

7.9

Crew

8.5

Entertainment

7.1

Food

7.1

Boarding

8.2

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Southwest
8.0
Very good
4,279 reviews
Alaska Airlines
8.0
Very good
9,871 reviews

Comfort

7.9

Crew

8.5

Entertainment

7.1

Food

7.1

Boarding

8.2

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Delta
8.0
Very good
7,918 reviews
Alaska Airlines
8.0
Very good
9,871 reviews

Comfort

7.9

Crew

8.5

Entertainment

7.1

Food

7.1

Boarding

8.2

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Hawaiian Airlines
7.9
Good
2,375 reviews
Alaska Airlines
8.0
Very good
9,871 reviews

Comfort

7.9

Crew

8.5

Entertainment

7.1

Food

7.1

Boarding

8.2

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
United Airlines
7.4
Good
8,658 reviews
Alaska Airlines
8.0
Very good
9,871 reviews

Comfort

7.9

Crew

8.5

Entertainment

7.1

Food

7.1

Boarding

8.2

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them

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.

  • 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 $83. Users have also found prices from $138 and $145 on Alaska Airlines and Hawaiian 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 $168. On average you can expect to pay $291. The most popular route, (Ontario - Washington, D.C. Dulles Intl), can usually be booked for $189.

  • 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 avril 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$130Average$191FlexibilityNo cancel feeOn-time65%
FrontierCheapest$148Average$254FlexibilityNo cancel feeOn-time62%
DeltaCheapest$296Average$467FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$306Average$497FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$311Average$576FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$326Average$443FlexibilityNo cancel feeOn-time63%

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