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$52+ 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 3/25. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BWI
Feb 4 — Feb 111
Tue 2/4
Tue 2/11
1 adult, Economy
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Cheap flight deals from Ontario to Maryland

Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to Maryland (USMD). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated January 30, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$130
(Frontier)

One-way from

$52
(Trip.com)

Popular in

December

Cheapest in

February

Average price

$348

Good round-trip deal

$773 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 ($42 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 January 2025
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Price to beat on a round-trip 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 January 30, 2025.

This Frontier deal was found by Cheapflights users on 1/28. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/1912:59 amONT - PHL
1 stop7h 40mFrontier
Wed 2/267:45 amPHL - ONT
1 stop10h 34mFrontier
Deal found 1/28$130
This Frontier deal was found by Cheapflights users on 1/29. 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.
Tue 4/812:59 amONT - BWI
1 stop12h 29mFrontier
Thu 4/1712:05 pmBWI - ONT
1 stop8h 08mFrontier
Deal found 1/29$130
This Frontier deal was found by Cheapflights users on 1/30. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/2712:59 amONT - DCA
1 stop13h 00mFrontier
Thu 3/61:03 pmDCA - ONT
1 stop14h 06mFrontier
Deal found 1/30$230
This Expedia deal was found by Cheapflights users on 1/30. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/3011:46 amONT - DCA
2 stops16h 14mMultiple Airlines
Sat 5/37:00 amDCA - ONT
1 stop7h 26mMultiple Airlines
Deal found 1/30$324
This Alaska Airlines deal was found by Cheapflights users on 1/30. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/54:20 pmONT - BWI
1 stop22h 36mAlaska Airlines
Tue 3/116:56 pmBWI - ONT
1 stop19h 06mAlaska Airlines
Deal found 1/30$326
This Alaska Airlines deal was found by Cheapflights users on 1/29. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/206:00 amONT - IAD
1 stop8h 48mAlaska Airlines
Tue 2/257:00 amIAD - ONT
1 stop17h 27mAlaska Airlines
Deal found 1/29$326
This Delta deal was found by Cheapflights users on 1/30. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/251:21 pmONT - BWI
1 stop7h 11mDelta
Tue 3/47:15 amBWI - ONT
1 stop7h 45mDelta
Deal found 1/30$327
This Delta deal was found by Cheapflights users on 1/29. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/221:05 pmONT - DCA
1 stop6h 34mDelta
Tue 2/255:10 pmDCA - ONT
1 stop9h 41mDelta
Deal found 1/29$327
This Delta deal was found by Cheapflights users on 1/30. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/281:21 pmONT - IAD
1 stop7h 13mDelta
Tue 3/47:20 amIAD - ONT
1 stop8h 04mDelta
Deal found 1/30$327
This American Airlines deal was found by Cheapflights users on 1/29. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/156:05 amONT - IAD
1 stop7h 07mAmerican Airlines
Sat 2/226:12 amIAD - ONT
1 stop10h 46mAmerican Airlines
Deal found 1/29$328
This American Airlines deal was found by Cheapflights users on 1/29. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/202:54 pmONT - DCA
1 stop6h 51mAmerican Airlines
Tue 2/2511:40 amDCA - ONT
2 stops9h 46mAmerican Airlines
Deal found 1/29$332
This American Airlines deal was found by Cheapflights users on 1/30. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/410:51 amONT - BWI
2 stops10h 27mAmerican Airlines
Thu 3/64:53 pmBWI - ONT
2 stops10h 00mAmerican Airlines
Deal found 1/30$337

Find flights from Ontario to Maryland within your budget

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 January 30, 2025.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Wed 2/19

12:59 am-11:39 am

1 stop7h 40m

Philadelphia

Wed 2/26

7:45 am-3:19 pm

1 stop10h 34m

$130

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Tue 4/8

12:59 am-4:28 pm

1 stop12h 29m

Baltimore/Washington

Thu 4/17

12:05 pm-5:13 pm

1 stop8h 08m

$130

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Thu 2/27

12:59 am-4:59 pm

1 stop13h 00m

Washington, D.C. Reagan-National

Thu 3/6

1:03 pm-12:09 am

1 stop14h 06m

$230

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Wed 4/30

11:46 am-7:00 am

2 stops16h 14m

Washington, D.C. Reagan-National

Sat 5/3

7:00 am-11:26 am

1 stop7h 26m

$324

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Wed 3/5

4:20 pm-5:56 pm

1 stop22h 36m

Baltimore/Washington

Tue 3/11

6:56 pm-11:02 am

1 stop19h 06m

$326

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Sat 2/15

6:59 am-6:46 pm

1 stop8h 47m

Washington, D.C. Reagan-National

Sat 2/22

12:57 pm-6:35 pm

1 stop8h 38m

$326

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Thu 2/20

6:00 am-5:48 pm

1 stop8h 48m

Washington, D.C. Dulles Intl

Tue 2/25

7:00 am-9:27 pm

1 stop17h 27m

$326

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Tue 2/25

1:21 pm-11:32 pm

1 stop7h 11m

Baltimore/Washington

Sat 3/8

7:15 am-12:24 pm

1 stop8h 09m

$327

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Sat 2/22

1:05 pm-10:39 pm

1 stop6h 34m

Washington, D.C. Reagan-National

Tue 2/25

5:10 pm-11:51 pm

1 stop9h 41m

$327

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Fri 2/28

1:21 pm-11:34 pm

1 stop7h 13m

Washington, D.C. Dulles Intl

Tue 3/4

7:20 am-12:24 pm

1 stop8h 04m

$327

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/30

Showing 1-10 of 47 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.

Travel insights for flights from Ontario to Maryland

Get recent, data-driven insights about flights from Ontario to Maryland including ideal travel times, pricing trends, and more.

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 January 30, 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 January 30, 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
4,585 reviews

Crew

8.7

Food

7.1

Entertainment

7.7

Boarding

8.2

Comfort

8.1

Overall

8.1

Reviews

1 / 20

6.0
Good

Lauren,Dec 2024

MCI - DCA

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Southwest
8.1
Very good
4,585 reviews
Southwest
8.1
Very good
4,585 reviews

Crew

8.7

Food

7.1

Entertainment

7.7

Boarding

8.2

Comfort

8.1

Overall

8.1

Reviews

1 / 20

6.0
Good

Lauren,Dec 2024

MCI - DCA

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Alaska Airlines
8.0
Very good
9,688 reviews
Southwest
8.1
Very good
4,585 reviews

Crew

8.7

Food

7.1

Entertainment

7.7

Boarding

8.2

Comfort

8.1

Overall

8.1

Reviews

1 / 20

6.0
Good

Lauren,Dec 2024

MCI - DCA

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Delta
8.0
Very good
8,454 reviews
Southwest
8.1
Very good
4,585 reviews

Crew

8.7

Food

7.1

Entertainment

7.7

Boarding

8.2

Comfort

8.1

Overall

8.1

Reviews

1 / 20

6.0
Good

Lauren,Dec 2024

MCI - DCA

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

United Airlines
7.4
Good
8,913 reviews
Southwest
8.1
Very good
4,585 reviews

Crew

8.7

Food

7.1

Entertainment

7.7

Boarding

8.2

Comfort

8.1

Overall

8.1

Reviews

1 / 20

6.0
Good

Lauren,Dec 2024

MCI - DCA

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

American Airlines
7.2
Good
10,000 reviews
Southwest
8.1
Very good
4,585 reviews

Crew

8.7

Food

7.1

Entertainment

7.7

Boarding

8.2

Comfort

8.1

Overall

8.1

Reviews

1 / 20

6.0
Good

Lauren,Dec 2024

MCI - DCA

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

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 $52. Users have also found prices from $161 and $164 on Alaska 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 - Washington, D.C. Reagan-National.

  • What are the cheapest flights from Ontario to Maryland?

    The cheapest flight price from Ontario to Maryland is $649. On average you can expect to pay $773. The most popular route, (Ontario - Washington, D.C. Dulles Intl), can usually be booked for $327.

  • 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

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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 January 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$148Average$273FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$151Average$251FlexibilityNo cancel feeOn-time65%
United AirlinesCheapest$256Average$540FlexibilityNo cancel feeOn-time69%
DeltaCheapest$296Average$511FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$301Average$461FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$332Average$567FlexibilityNo cancel feeOn-time71%
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