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$48+ Cheap flights from Maryland to Ontario (ONT)

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 3/26. Fares are subject to change and may not be available on all flights or dates of travel.
BWI — ONT
Feb 25 — Mar 41
Tue 2/25
Tue 3/4
1 adult, Economy
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Cheap flight deals from Maryland to Ontario

Keep the following information in mind while searching for Maryland to Ontario flight deals. Data was last updated February 20, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$127
(Cheapflightsfares)

One-way from

$48
(Trip.com)

Popular in

December

Cheapest in

September

Average price

$327
Provider with most accurate pricing for Washington, D.C. (WAS)-Los Angeles flight deals.
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From Maryland to Ontario
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One-way flight from Maryland to Ontario
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Highest demand for flights based on searches. 7% potential increase in price ($31 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($11 potential savings vs. average RT price).
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Average for round-trip flights in February 2025
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Find flight deals from Maryland to Ontario

Cheapest flights from Maryland to Ontario
Explore the most affordable flight options available from Maryland to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 20, 2025.

This Cheapflightsfares deal was found by Cheapflights users on 2/20. 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.
Thu 4/312:05 pmBWI - ONT
1 stop8h 08mFrontier
Sun 4/612:59 amONT - BWI
1 stop7h 28mFrontier
Deal found 2/20$128
This Frontier deal was found by Cheapflights users on 2/20. 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 4/18:31 amPHL - ONT
1 stop12h 25mFrontier
Tue 4/82:43 pmONT - PHL
1 stop13h 04mFrontier
Deal found 2/20$130
This Mytrip deal was found by Cheapflights users on 2/20. 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.
Thu 3/131:03 pmDCA - ONT
1 stop14h 06mFrontier
Fri 3/2112:59 amONT - DCA
1 stop18h 00mFrontier
Deal found 2/20$177
This Frontier deal was found by Cheapflights users on 2/19. 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 5/58:01 amIAD - ONT
1 stop8h 15mFrontier
Thu 5/86:35 pmONT - IAD
1 stop8h 56mFrontier
Deal found 2/19$180
This Alaska Airlines deal was found by Cheapflights users on 2/20. 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 3/207:00 amIAD - ONT
1 stop19h 59mAlaska Airlines
Tue 3/256:00 amONT - IAD
1 stop20h 34mAlaska Airlines
Deal found 2/20$302
This Delta deal was found by Cheapflights users on 2/19. 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 4/227:25 amIAD - ONT
1 stop9h 30mDelta
Sat 4/265:30 pmONT - IAD
1 stop9h 51mDelta
Deal found 2/19$303
This Delta deal was found by Cheapflights users on 2/20. 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 3/1812:28 pmBWI - ONT
2 stops12h 54mDelta
Mon 3/245:30 pmONT - BWI
2 stops15h 03mDelta
Deal found 2/20$304
This Southwest deal was found by Cheapflights users on 2/20. 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.
Wed 3/123:55 pmBWI - ONT
1 stop10h 00mSouthwest
Mon 3/246:05 pmONT - BWI
1 stop8h 45mSouthwest
Deal found 2/20$327
This Delta deal was found by Cheapflights users on 2/19. 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.
Mon 3/176:00 amDCA - ONT
1 stop8h 36mDelta
Wed 3/1912:46 pmONT - DCA
1 stop6h 48mDelta
Deal found 2/19$327
This United Airlines deal was found by Cheapflights users on 2/19. 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.
Wed 3/122:15 pmIAD - ONT
1 stop11h 30mUnited Airlines
Tue 3/256:00 amONT - IAD
1 stop7h 29mUnited Airlines
Deal found 2/19$328
This American Airlines deal was found by Cheapflights users on 2/19. 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.
Wed 3/129:28 amDCA - ONT
2 stops9h 04mAmerican Airlines
Sun 3/169:30 pmONT - DCA
1 stop6h 30mAmerican Airlines
Deal found 2/19$332
This American Airlines deal was found by Cheapflights users on 2/19. 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 3/186:18 amIAD - ONT
1 stop10h 42mAmerican Airlines
Mon 3/247:35 pmONT - IAD
2 stops10h 15mAmerican Airlines
Deal found 2/19$332

Find flights from Maryland to Ontario within your budget

Customize your flight search to find flights from Maryland to Ontario 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 February 20, 2025.

Fly from

Maryland

Fly to

Ontario

Route

Depart

Return

Price

BaltimoreOntario

BWI - ONT

BWIONT

Baltimore/Washington

Thu 4/3

12:05 pm-5:13 pm

1 stop8h 08m

Ontario

Sun 4/6

12:59 am-11:27 am

1 stop7h 28m

$128

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Tue 4/1

7:00 am-3:04 pm

1 stop11h 04m

Ontario

Tue 4/8

2:43 pm-6:47 am

1 stop13h 04m

$130

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Thu 3/13

1:03 pm-12:09 am

1 stop14h 06m

Ontario

Fri 3/21

12:59 am-9:59 pm

1 stop18h 00m

$177

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Mon 5/5

8:01 am-1:16 pm

1 stop8h 15m

Ontario

Thu 5/8

6:35 pm-6:31 am

1 stop8h 56m

$180

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Wed 3/5

6:00 pm-12:06 am

1 stop9h 06m

Ontario

Wed 3/12

6:00 am-9:59 pm

1 stop12h 59m

$292

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Thu 3/20

7:00 am-11:59 pm

1 stop19h 59m

Ontario

Wed 3/26

6:00 am-5:59 pm

1 stop8h 59m

$302

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Tue 4/22

7:25 am-1:55 pm

1 stop9h 30m

Ontario

Sat 4/26

5:30 pm-6:21 am

1 stop9h 51m

$303

BaltimoreOntario

BWI - ONT

BWIONT

Baltimore/Washington

Tue 3/18

12:28 pm-10:22 pm

2 stops12h 54m

Ontario

Mon 3/24

5:30 pm-11:33 am

2 stops15h 03m

$304

BaltimoreOntario

BWI - ONT

BWIONT

Baltimore/Washington

Wed 3/12

3:55 pm-10:55 pm

1 stop10h 00m

Ontario

Mon 3/24

6:05 pm-5:50 am

1 stop8h 45m

$327

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Mon 3/17

6:00 am-11:36 am

1 stop8h 36m

Ontario

Wed 3/19

12:46 pm-10:34 pm

1 stop6h 48m

$327

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/20

Showing 1-10 of 52 results
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Best time to book a flight from Maryland to Ontario

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

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

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

Currently, August is the cheapest month in which you can book a flight from Maryland to Ontario (average of $246). Flying from Maryland to Ontario in March is currently the most expensive (average of $315). 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 MD to ONT?

Find hourly flight availability from Maryland to Ontario. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated February 20, 2025.

When flying from Maryland to Ontario, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Rainfall in Ontario by month

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

In terms of precipitation, rainfall in Ontario ranges from 0.1 - 3.4 inches per month. February is typically the wettest month, when rainfall can reach 3.4 in. June is typically the driest time to visit Ontario when rainfall is around 0.1 in.

Temperature in Ontario by month

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

If weather is an important factor for your trip to Ontario, use this chart to help with planning. For those seeking warmer temperatures, August is the ideal time of year to visit, when temperatures reach an average of 78.8 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 53.6 F).

Reviews of airlines servicing Ontario

Get insights into the airlines that provide service to Ontario. 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 Ontario. Reviews last updated February 20, 2025.
Get a feel of what it's like to fly with Southwest, Alaska Airlines and Delta from Maryland to Ontario by reading reviews from past customers. 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
4,411 reviews

Food

7.1

Boarding

8.2

Comfort

8.1

Overall

8.1

Crew

8.7

Entertainment

7.6

Reviews

1 / 20

8.0
Excellent

Christine,Aug 2024

DEN - LGB

No issues. I needed pre boarding and I was able to get it without issue

Southwest
8.1
Very good
4,411 reviews
Southwest
8.1
Very good
4,411 reviews

Food

7.1

Boarding

8.2

Comfort

8.1

Overall

8.1

Crew

8.7

Entertainment

7.6

Reviews

1 / 20

8.0
Excellent

Christine,Aug 2024

DEN - LGB

No issues. I needed pre boarding and I was able to get it without issue

Alaska Airlines
8.0
Very good
9,697 reviews
Southwest
8.1
Very good
4,411 reviews

Food

7.1

Boarding

8.2

Comfort

8.1

Overall

8.1

Crew

8.7

Entertainment

7.6

Reviews

1 / 20

8.0
Excellent

Christine,Aug 2024

DEN - LGB

No issues. I needed pre boarding and I was able to get it without issue

Delta
8.0
Very good
8,219 reviews
Southwest
8.1
Very good
4,411 reviews

Food

7.1

Boarding

8.2

Comfort

8.1

Overall

8.1

Crew

8.7

Entertainment

7.6

Reviews

1 / 20

8.0
Excellent

Christine,Aug 2024

DEN - LGB

No issues. I needed pre boarding and I was able to get it without issue

Hawaiian Airlines
7.9
Good
2,317 reviews
Southwest
8.1
Very good
4,411 reviews

Food

7.1

Boarding

8.2

Comfort

8.1

Overall

8.1

Crew

8.7

Entertainment

7.6

Reviews

1 / 20

8.0
Excellent

Christine,Aug 2024

DEN - LGB

No issues. I needed pre boarding and I was able to get it without issue

United Airlines
7.4
Good
8,765 reviews
Southwest
8.1
Very good
4,411 reviews

Food

7.1

Boarding

8.2

Comfort

8.1

Overall

8.1

Crew

8.7

Entertainment

7.6

Reviews

1 / 20

8.0
Excellent

Christine,Aug 2024

DEN - LGB

No issues. I needed pre boarding and I was able to get it without issue

Related info for your journey

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

    Most people fly into Ontario (ONT) if they book a flight to Ontario from Maryland. Ontario is conveniently located just 3.1 mi from Ontario’s city center.

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

    The cheapest airlines for a one-way flight from Maryland to Ontario are Frontier ($48), Hawaiian Airlines ($151), and Delta ($152).

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

    When deciding which route to take from Maryland to Ontario consider Washington, D.C. Dulles Intl - Ontario, Baltimore/Washington - Ontario or Washington, D.C. Reagan-National - Ontario as they are the most popular.

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

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

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

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

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

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

    Currently, August is the cheapest month in which you can book a flight from Maryland to Ontario (average of $246). Flying from Maryland to Ontario in March is currently the most expensive (average of $315). 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 Maryland to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
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Top 5 airlines flying from Maryland to Ontario

Discover the top 5 airlines that operate flights from Maryland to Ontario. 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 February 20, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$154Average$248FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$286Average$526FlexibilityNo cancel feeOn-time69%
DeltaCheapest$306Average$458FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$321Average$538FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$326Average$468FlexibilityNo cancel feeOn-time63%
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