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Ontario

$91+ 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 8/23. Fares are subject to change and may not be available on all flights or dates of travel.
BWI — ONT
Jul 30 — Aug 61
Wed 7/30
Wed 8/6
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 July 25, 2025.

Round-trip from

$203
(Trip.com)

One-way from

$91
(Trip.com)

Popular in

December

Cheapest in

August

Average price

$327

Good round-trip deal

$272 or less

Good one-way deal

$168 or less
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. 9% potential increase in price ($37 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($12 potential savings vs. average RT price).
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Average for round-trip flights in July 2025
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Price to beat on a round-trip flight from Maryland to Ontario.
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Price to beat on a one-way flight from Maryland to Ontario.
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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 July 25, 2025.

This Trip.com deal was found by Cheapflights users on 7/23. 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.
Fri 8/157:30 amIAD - ONT
1 stop16h 22mFrontier
Mon 8/187:22 pmONT - IAD
1 stop8h 12mFrontier
Deal found 7/23$203
This Frontier deal was found by Cheapflights users on 7/24. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/305:26 pmBWI - ONT
1 stop9h 24mFrontier
Tue 8/512:59 amONT - BWI
1 stop12h 32mFrontier
Deal found 7/24$258
This Frontier deal was found by Cheapflights users on 7/24. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/97:19 amPHL - ONT
1 stop12h 01mFrontier
Wed 8/137:22 pmONT - PHL
1 stop7h 27mFrontier
Deal found 7/24$258
This Frontier deal was found by Cheapflights users on 7/24. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/121:00 pmDCA - ONT
1 stop13h 50mFrontier
Mon 8/1812:59 amONT - DCA
1 stop13h 00mFrontier
Deal found 7/24$258
This American Airlines deal was found by Cheapflights users on 7/22. 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 8/183:25 pmDCA - ONT
1 stop10h 23mAmerican Airlines
Mon 8/2511:59 pmONT - DCA
1 stop13h 21mAmerican Airlines
Deal found 7/22$303
This American Airlines deal was found by Cheapflights users on 7/23. 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 8/1911:51 amIAD - ONT
1 stop13h 57mAmerican Airlines
Tue 8/2611:59 pmONT - IAD
1 stop16h 01mAmerican Airlines
Deal found 7/23$303
This Alaska Airlines deal was found by Cheapflights users on 7/23. 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.
Tue 8/267:00 amBWI - ONT
1 stop10h 09mAlaska Airlines
Sat 9/63:06 pmONT - BWI
1 stop11h 33mAlaska Airlines
Deal found 7/23$306
This Alaska Airlines deal was found by Cheapflights users on 7/23. 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 10/17:22 amPHL - ONT
1 stop9h 50mAlaska Airlines
Tue 11/44:11 pmONT - PHL
1 stop10h 31mAlaska Airlines
Deal found 7/23$306
This Delta deal was found by Cheapflights users on 7/23. 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 8/145:40 amBWI - ONT
1 stop7h 55mDelta
Mon 8/251:15 pmONT - BWI
1 stop7h 41mDelta
Deal found 7/23$307
This Delta deal was found by Cheapflights users on 7/24. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/186:55 pmPHL - ONT
1 stop7h 45mDelta
Tue 8/2611:45 amONT - PHL
1 stop7h 35mDelta
Deal found 7/24$307
This Southwest deal was found by Cheapflights users on 7/22. 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.
Thu 11/136:40 amBWI - ONT
2 stops9h 55mSouthwest
Mon 11/179:55 amONT - BWI
1 stop6h 45mSouthwest
Deal found 7/22$322
This Alaska Airlines deal was found by Cheapflights users on 7/23. 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 9/117:00 amIAD - ONT
1 stop10h 12mAlaska Airlines
Mon 9/157:47 pmONT - IAD
1 stop8h 46mAlaska Airlines
Deal found 7/23$326

Cheapflights Fare Finder

 
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 July 25, 2025.
Use the filters below to find and compare flights from Maryland to Ontario that are best for you.

Fly from

Maryland

Fly to

Ontario

Route

Depart

Return

Price

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Fri 8/15

7:30 am-8:52 pm

1 stop16h 22m

Ontario

Mon 8/18

7:22 pm-6:34 am

1 stop8h 12m

$203

BaltimoreOntario

BWI - ONT

BWIONT

Baltimore/Washington

Wed 8/13

5:26 pm-11:50 pm

1 stop9h 24m

Ontario

Fri 8/15

12:59 am-4:31 pm

1 stop12h 32m

$258

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Sat 8/9

7:19 am-4:20 pm

1 stop12h 01m

Ontario

Wed 8/13

7:22 pm-5:49 am

1 stop7h 27m

$258

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Tue 8/12

1:00 pm-11:50 pm

1 stop13h 50m

Ontario

Mon 8/18

12:59 am-4:59 pm

1 stop13h 00m

$258

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Mon 8/18

3:25 pm-10:48 pm

1 stop10h 23m

Ontario

Mon 8/25

11:59 pm-4:20 pm

1 stop13h 21m

$303

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Tue 8/19

11:51 am-10:48 pm

1 stop13h 57m

Ontario

Tue 8/26

11:59 pm-7:00 pm

1 stop16h 01m

$303

BaltimoreOntario

BWI - ONT

BWIONT

Baltimore/Washington

Tue 8/26

7:00 am-2:09 pm

1 stop10h 09m

Ontario

Mon 9/8

3:06 pm-5:39 am

1 stop11h 33m

$306

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Wed 10/1

7:22 am-2:12 pm

1 stop9h 50m

Ontario

Mon 11/3

4:11 pm-5:42 am

1 stop10h 31m

$306

BaltimoreOntario

BWI - ONT

BWIONT

Baltimore/Washington

Thu 8/14

5:40 am-10:35 am

1 stop7h 55m

Ontario

Mon 8/25

1:15 pm-11:56 pm

1 stop7h 41m

$307

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Mon 8/18

6:55 pm-11:40 pm

1 stop7h 45m

Ontario

Tue 8/26

11:45 am-10:20 pm

1 stop7h 35m

$307

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/22

Showing 1-10 of 46 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.

Cheapflights Insights

Everything you need to know about your flight from Maryland to Ontario

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 $328). 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 July 25, 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.

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 July 25, 2025.
Read through reviews of airlines operating flights from Maryland to Ontario, such as Alaska Airlines, Southwest, and Delta. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Overall

8.0

Crew

8.5

Boarding

8.1

Comfort

7.8

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

Overall

8.0

Crew

8.5

Boarding

8.1

Comfort

7.8

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
4,235 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Overall

8.0

Crew

8.5

Boarding

8.1

Comfort

7.8

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
7,967 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Overall

8.0

Crew

8.5

Boarding

8.1

Comfort

7.8

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
7.8
Good
2,595 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Overall

8.0

Crew

8.5

Boarding

8.1

Comfort

7.8

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
8,876 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Overall

8.0

Crew

8.5

Boarding

8.1

Comfort

7.8

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 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.

  • How popular is this Maryland to Ontario flight route?

    This flight path from Maryland to Ontario 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 Maryland to Ontario one-way?

    The cheapest airlines for a one-way flight from Maryland to Ontario are Frontier ($95), Hawaiian Airlines ($151), and Alaska Airlines ($153).

  • 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.

  • What are the cheapest flights from Maryland to Ontario?

    The cheapest flight price from Maryland to Ontario is $102. On average you can expect to pay $295. The most popular route, (Washington, D.C. Dulles Intl - Ontario), can usually be booked for $252.

  • 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 $328). 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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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 July 25, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$175Average$248FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$222Average$524FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$276Average$446FlexibilityNo cancel feeOn-time71%
DeltaCheapest$326Average$464FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$326Average$466FlexibilityNo cancel feeOn-time63%

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