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$109+ 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 5/5. Fares are subject to change and may not be available on all flights or dates of travel.
BWI — ONT
Apr 2 — Apr 91
Mi 4/2
Mi 4/9
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 März 28, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$223
(Trip.com)

One-way from

$109
(Trip.com)

Popular in

December

Cheapest in

September

Average price

$406

Good round-trip deal

$488 or less
Provider with most accurate pricing for Washington, D.C. (WAS)-Los Angeles flight deals.
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Provider most trusted by Cheapflights users for Washington, D.C. (WAS)-Los Angeles flights.
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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 ($30 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 March 2025
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Price to beat on a round-trip 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 März 28, 2025.

This Trip.com deal was found by Cheapflights users on 3/27. 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.
Mi 4/98:00 amPHL - ONT
1 stop10h 04mFrontier
Di 4/2910:44 amONT - PHL
1 stop17h 03mFrontier
Deal found 3/27$223
This Cheapflightsfares deal was found by Cheapflights users on 3/27. 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.
Mi 4/237:00 amDCA - ONT
1 stop7h 20mFrontier
Fr 4/2512:11 pmONT - DCA
1 stop6h 48mFrontier
Deal found 3/27$236
This Frontier deal was found by Cheapflights users on 3/27. 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.
Fr 5/28:01 amIAD - ONT
1 stop8h 15mFrontier
Fr 5/92:28 pmONT - IAD
1 stop13h 03mFrontier
Deal found 3/27$238
This CheapOair deal was found by Cheapflights users on 3/27. 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.
Fr 4/255:58 pmBWI - ONT
1 stop20h 22mFrontier
So 4/2712:59 amONT - BWI
1 stop12h 59mFrontier
Deal found 3/27$240
This Delta deal was found by Cheapflights users on 3/27. 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.
Mo 4/217:05 amBWI - ONT
1 stop8h 11mDelta
Mi 4/305:15 pmONT - BWI
1 stop9h 35mDelta
Deal found 3/27$267
This American Airlines deal was found by Cheapflights users on 3/27. 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.
Mo 4/217:08 pmBWI - ONT
1 stop7h 42mAmerican Airlines
Mi 4/3012:50 pmONT - BWI
2 stops8h 34mAmerican Airlines
Deal found 3/27$272
This Alaska Airlines deal was found by Cheapflights users on 3/27. 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.
Sa 4/267:06 amBWI - ONT
1 stop11h 26mAlaska Airlines
Sa 5/34:29 pmONT - BWI
1 stop10h 17mAlaska Airlines
Deal found 3/27$277
This Alaska Airlines deal was found by Cheapflights users on 3/27. 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.
Mi 4/236:30 amIAD - ONT
1 stop12h 02mAlaska Airlines
Sa 4/266:00 amONT - IAD
1 stop11h 43mAlaska Airlines
Deal found 3/27$295
This Kiwi.com deal was found by Cheapflights users on 3/27. 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.
Sa 4/266:30 amIAD - ONT
1 stop12h 02mHawaiian Airlines
Sa 5/36:00 amONT - IAD
1 stop11h 43mHawaiian Airlines
Deal found 3/27$315
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sa 4/266:00 amDCA - ONT
1 stop7h 57mDelta
Sa 5/312:07 pmONT - DCA
1 stop7h 31mDelta
Deal found 3/26$316
This Delta deal was found by Cheapflights users on 3/27. 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.
Sa 4/266:00 amIAD - ONT
1 stop7h 57mDelta
Sa 5/310:15 pmONT - IAD
1 stop8h 05mDelta
Deal found 3/27$317
This Hawaiian 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 Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Do 5/87:06 amBWI - ONT
1 stop11h 26mHawaiian Airlines
Mo 5/124:29 pmONT - BWI
1 stop10h 17mHawaiian Airlines
Deal found 3/26$321

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 März 28, 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

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Mi 4/9

8:00 am-3:04 pm

1 stop10h 04m

Ontario

Di 4/29

10:44 am-6:47 am

1 stop17h 03m

$223

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Mi 4/23

7:00 am-11:20 am

1 stop7h 20m

Ontario

Fr 4/25

12:11 pm-9:59 pm

1 stop6h 48m

$236

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Fr 5/2

8:01 am-1:16 pm

1 stop8h 15m

Ontario

Fr 5/9

2:28 pm-6:31 am

1 stop13h 03m

$238

BaltimoreOntario

BWI - ONT

BWIONT

Baltimore/Washington

Fr 4/25

5:58 pm-11:20 am

1 stop20h 22m

Ontario

So 4/27

12:59 am-4:58 pm

1 stop12h 59m

$240

BaltimoreOntario

BWI - ONT

BWIONT

Baltimore/Washington

Mo 4/21

7:05 am-12:16 pm

1 stop8h 11m

Ontario

Mi 4/30

5:15 pm-5:50 am

1 stop9h 35m

$267

BaltimoreOntario

BWI - ONT

BWIONT

Baltimore/Washington

Mo 4/21

7:08 pm-11:50 pm

1 stop7h 42m

Ontario

Mi 4/30

12:50 pm-12:24 am

2 stops8h 34m

$272

BaltimoreOntario

BWI - ONT

BWIONT

Baltimore/Washington

Sa 4/26

7:06 am-3:32 pm

1 stop11h 26m

Ontario

Sa 5/3

4:29 pm-5:46 am

1 stop10h 17m

$277

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Mi 4/23

6:30 am-3:32 pm

1 stop12h 02m

Ontario

Sa 4/26

6:00 am-8:43 pm

1 stop11h 43m

$295

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Sa 4/26

6:30 am-3:32 pm

1 stop12h 02m

Ontario

Sa 5/3

6:00 am-8:43 pm

1 stop11h 43m

$315

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Sa 4/26

6:00 am-10:57 am

1 stop7h 57m

Ontario

Sa 5/3

12:07 pm-10:38 pm

1 stop7h 31m

$316

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/27

Showing 1-10 of 58 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 $326). 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 März 28, 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 März 28, 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
4,274 reviews

Overall

8.1

Boarding

8.2

Crew

8.7

Entertainment

7.6

Comfort

8.1

Food

7.1

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

Overall

8.1

Boarding

8.2

Crew

8.7

Entertainment

7.6

Comfort

8.1

Food

7.1

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
9,798 reviews
Southwest
8.1
Very good
4,274 reviews

Overall

8.1

Boarding

8.2

Crew

8.7

Entertainment

7.6

Comfort

8.1

Food

7.1

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
7,897 reviews
Southwest
8.1
Very good
4,274 reviews

Overall

8.1

Boarding

8.2

Crew

8.7

Entertainment

7.6

Comfort

8.1

Food

7.1

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
2,336 reviews
Southwest
8.1
Very good
4,274 reviews

Overall

8.1

Boarding

8.2

Crew

8.7

Entertainment

7.6

Comfort

8.1

Food

7.1

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
8,603 reviews
Southwest
8.1
Very good
4,274 reviews

Overall

8.1

Boarding

8.2

Crew

8.7

Entertainment

7.6

Comfort

8.1

Food

7.1

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 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 ($109), Alaska Airlines ($134), and Delta ($139).

  • 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 Philadelphia - 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 $357. On average you can expect to pay $513. The most popular route, (Washington, D.C. Dulles Intl - Ontario), can usually be booked for $254.

  • 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 $326). 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 März 28, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$154Average$245FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$286Average$520FlexibilityNo cancel feeOn-time69%
DeltaCheapest$306Average$458FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$321Average$541FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$326Average$490FlexibilityNo cancel feeOn-time63%
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