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$95+ 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 4/23. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BWI
Mar 31 — Apr 71
Mon 3/31
Mon 4/7
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 March 26, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$190
(Trip.com)

One-way from

$95
(Trip.com)

Popular in

December

Cheapest in

August

Average price

$414

Good round-trip deal

$378 or less

Good one-way deal

$191 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. 8% potential increase in price ($34 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 March 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 March 26, 2025.

This Trip.com deal was found by Cheapflights users on 3/25. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/82:43 pmONT - PHL
1 stop13h 04mFrontier
Wed 4/306:45 pmPHL - ONT
1 stop15h 39mFrontier
Deal found 3/25$190
This Expedia deal was found by Cheapflights users on 3/25. 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.
Mon 5/56:24 pmONT - BWI
1 stop8h 22mMultiple Airlines
Fri 5/96:12 pmBWI - ONT
1 stop8h 47mMultiple Airlines
Deal found 3/25$266
This Alaska Airlines deal was found by Cheapflights users on 3/25. 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 5/14:29 pmONT - BWI
1 stop10h 17mAlaska Airlines
Tue 5/67:06 amBWI - ONT
1 stop11h 26mAlaska Airlines
Deal found 3/25$273
This Kiwi.com deal was found by Cheapflights users on 3/25. 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.
Tue 4/2912:10 pmONT - DCA
1 stop6h 49mFrontier
Fri 5/27:00 amDCA - ONT
1 stop7h 26mFrontier
Deal found 3/25$276
This Delta deal was found by Cheapflights users on 3/25. 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 4/175:15 pmONT - BWI
1 stop9h 35mDelta
Mon 4/217:05 amBWI - ONT
1 stop8h 11mDelta
Deal found 3/25$277
This Frontier deal was found by Cheapflights users on 3/25. 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.
Tue 4/112:59 amONT - BWI
1 stop12h 29mFrontier
Sat 4/58:24 pmBWI - ONT
1 stop14h 05mFrontier
Deal found 3/25$278
This Frontier deal was found by Cheapflights users on 3/25. 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.
Mon 5/52:28 pmONT - IAD
1 stop13h 03mFrontier
Thu 5/88:01 amIAD - ONT
1 stop10h 38mFrontier
Deal found 3/25$278
This United Airlines deal was found by Cheapflights users on 3/25. 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.
Mon 5/55:05 amONT - BWI
2 stops13h 32mUnited Airlines
Fri 5/96:35 amBWI - ONT
1 stop8h 49mUnited Airlines
Deal found 3/25$304
This Alaska Airlines deal was found by Cheapflights users on 3/26. 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.
Sat 4/266:00 amONT - IAD
1 stop11h 43mAlaska Airlines
Sat 5/36:30 amIAD - ONT
1 stop12h 02mAlaska Airlines
Deal found 3/26$316
This Delta deal was found by Cheapflights users on 3/25. 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.
Tue 4/157:00 amONT - IAD
1 stop6h 37mDelta
Wed 4/306:00 amIAD - ONT
1 stop7h 57mDelta
Deal found 3/25$317
This Hawaiian Airlines deal was found by Cheapflights users on 3/25. 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.
Thu 4/106:00 amONT - IAD
1 stop8h 59mHawaiian Airlines
Sat 4/266:30 amIAD - ONT
1 stop12h 02mHawaiian Airlines
Deal found 3/25$321
This American Airlines deal was found by Cheapflights users on 3/24. 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.
Sun 5/1110:00 amONT - BWI
2 stops10h 53mAmerican Airlines
Sat 5/177:16 pmBWI - ONT
1 stop7h 27mAmerican Airlines
Deal found 3/24$322

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 March 26, 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

Tue 4/8

2:43 pm-6:47 am

1 stop13h 04m

Philadelphia

Wed 4/30

6:45 pm-7:24 am

1 stop15h 39m

$190

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Mon 5/5

6:24 pm-5:46 am

1 stop8h 22m

Baltimore/Washington

Fri 5/9

6:12 pm-11:59 pm

1 stop8h 47m

$266

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Thu 5/1

4:29 pm-5:46 am

1 stop10h 17m

Baltimore/Washington

Tue 5/6

7:06 am-3:32 pm

1 stop11h 26m

$273

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Tue 4/29

12:10 pm-9:59 pm

1 stop6h 49m

Washington, D.C. Reagan-National

Fri 5/2

7:00 am-11:26 am

1 stop7h 26m

$276

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Thu 4/17

5:15 pm-5:50 am

1 stop9h 35m

Baltimore/Washington

Mon 4/21

7:05 am-12:16 pm

1 stop8h 11m

$277

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Sun 4/6

12:59 am-11:27 am

1 stop7h 28m

Baltimore/Washington

Wed 4/9

8:49 pm-7:29 am

1 stop13h 40m

$278

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Mon 5/5

2:28 pm-6:31 am

1 stop13h 03m

Washington, D.C. Dulles Intl

Thu 5/8

8:01 am-3:39 pm

1 stop10h 38m

$278

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Mon 5/5

5:05 am-9:37 pm

2 stops13h 32m

Baltimore/Washington

Fri 5/9

6:35 am-12:24 pm

1 stop8h 49m

$304

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Sat 4/26

6:00 am-8:43 pm

1 stop11h 43m

Washington, D.C. Dulles Intl

Sat 5/3

6:30 am-3:32 pm

1 stop12h 02m

$316

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Tue 4/15

7:00 am-4:37 pm

1 stop6h 37m

Washington, D.C. Dulles Intl

Wed 4/30

6:00 am-10:57 am

1 stop7h 57m

$317

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/25

Showing 1-10 of 56 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 March 26, 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 March 26, 2025.
Peruse reviews from past customers who have flown with Southwest, Alaska Airlines 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.
Southwest
8.1
Very good
4,274 reviews

Crew

8.6

Entertainment

7.6

Food

7.1

Boarding

8.2

Overall

8.1

Comfort

8.1

Reviews

1 / 20
10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.
Southwest
8.1
Very good
4,274 reviews
Southwest
8.1
Very good
4,274 reviews

Crew

8.6

Entertainment

7.6

Food

7.1

Boarding

8.2

Overall

8.1

Comfort

8.1

Reviews

1 / 20
10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.
Alaska Airlines
8.0
Very good
9,789 reviews
Southwest
8.1
Very good
4,274 reviews

Crew

8.6

Entertainment

7.6

Food

7.1

Boarding

8.2

Overall

8.1

Comfort

8.1

Reviews

1 / 20
10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.
Delta
8.0
Very good
7,891 reviews
Southwest
8.1
Very good
4,274 reviews

Crew

8.6

Entertainment

7.6

Food

7.1

Boarding

8.2

Overall

8.1

Comfort

8.1

Reviews

1 / 20
10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.
Hawaiian Airlines
7.9
Good
2,330 reviews
Southwest
8.1
Very good
4,274 reviews

Crew

8.6

Entertainment

7.6

Food

7.1

Boarding

8.2

Overall

8.1

Comfort

8.1

Reviews

1 / 20
10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.
United Airlines
7.4
Good
8,608 reviews
Southwest
8.1
Very good
4,274 reviews

Crew

8.6

Entertainment

7.6

Food

7.1

Boarding

8.2

Overall

8.1

Comfort

8.1

Reviews

1 / 20
10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.

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 $95. Users have also found prices from $122 and $139 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 $188. On average you can expect to pay $308. The most popular route, (Ontario - Washington, D.C. Dulles Intl), can usually be booked for $280.

  • 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 March 26, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$130Average$212FlexibilityNo cancel feeOn-time65%
FrontierCheapest$148Average$266FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$256Average$525FlexibilityNo cancel feeOn-time69%
DeltaCheapest$296Average$456FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$321Average$455FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$332Average$570FlexibilityNo cancel feeOn-time71%
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