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Ontario

$94+ 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 5/7. Fares are subject to change and may not be available on all flights or dates of travel.
BWI — ONT
May 6 — May 131
Tue 5/6
Tue 5/13
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 May 1, 2025.

Most accurate provider

Mytrip
3 stars

Most trusted provider

Mytrip
3 stars

Round-trip from

$198
(Frontier)

One-way from

$94
(Cheapflightsfares)

Popular in

December

Cheapest in

September

Average price

$327

Good round-trip deal

$469 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. 8% potential increase in price ($31 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 May 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 May 1, 2025.

This Frontier deal was found by Cheapflights users on 5/1. 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 5/317:10 amPHL - ONT
1 stop12h 10mFrontier
Sat 6/75:21 pmONT - PHL
1 stop8h 49mFrontier
Deal found 5/1$198
This Frontier deal was found by Cheapflights users on 5/1. 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 6/25:20 pmBWI - ONT
1 stop9h 30mFrontier
Fri 6/612:59 amONT - BWI
1 stop12h 36mFrontier
Deal found 5/1$208
This Trip.com deal was found by Cheapflights users on 4/30. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/67:00 amDCA - ONT
1 stop19h 59mFrontier
Mon 6/212:59 amONT - DCA
1 stop8h 01mFrontier
Deal found 4/30$214
This Gotogate deal was found by Cheapflights users on 4/30. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/37:45 amIAD - ONT
1 stop26h 39mFrontier
Mon 5/510:52 amONT - IAD
1 stop16h 39mFrontier
Deal found 4/30$216
This Alaska Airlines deal was found by Cheapflights users on 4/30. 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 6/49:00 amIAD - ONT
1 stop9h 50mAlaska Airlines
Tue 6/107:20 pmONT - IAD
1 stop9h 16mAlaska Airlines
Deal found 4/30$292
This Alaska Airlines deal was found by Cheapflights users on 4/30. 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 9/107:20 amPHL - ONT
1 stop9h 49mAlaska Airlines
Tue 9/163:04 pmONT - PHL
1 stop11h 56mAlaska Airlines
Deal found 4/30$306
This Delta deal was found by Cheapflights users on 4/30. 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 8/265:55 amPHL - ONT
1 stop8h 12mDelta
Sat 8/307:00 amONT - PHL
1 stop8h 26mDelta
Deal found 4/30$307
This Expedia deal was found by Cheapflights users on 4/30. 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.
Mon 6/25:20 pmBWI - ONT
1 stop9h 30mMultiple Airlines
Sat 6/74:45 pmONT - BWI
1 stop10h 44mMultiple Airlines
Deal found 4/30$318
This American Airlines deal was found by Cheapflights users on 4/30. 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.
Wed 5/217:18 pmBWI - ONT
1 stop7h 25mAmerican Airlines
Wed 5/2810:40 pmONT - BWI
1 stop8h 16mAmerican Airlines
Deal found 4/30$319
This Hawaiian Airlines deal was found by Cheapflights users on 4/30. 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 Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/39:00 amIAD - ONT
1 stop9h 50mHawaiian Airlines
Tue 6/107:20 pmONT - IAD
1 stop9h 16mHawaiian Airlines
Deal found 4/30$326
This Delta deal was found by Cheapflights users on 5/1. 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.
Wed 6/45:15 pmDCA - ONT
1 stop9h 27mDelta
Tue 6/1011:49 amONT - DCA
1 stop6h 57mDelta
Deal found 5/1$327
This Delta deal was found by Cheapflights users on 4/30. 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.
Wed 6/47:45 amIAD - ONT
1 stop9h 30mDelta
Sat 6/712:18 pmONT - IAD
1 stop8h 17mDelta
Deal found 4/30$327

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 May 1, 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

Sat 5/31

7:10 am-4:20 pm

1 stop12h 10m

Ontario

Tue 6/3

6:42 pm-5:10 am

1 stop7h 28m

$198

BaltimoreOntario

BWI - ONT

BWIONT

Baltimore/Washington

Mon 6/2

5:20 pm-11:50 pm

1 stop9h 30m

Ontario

Fri 6/6

12:59 am-4:35 pm

1 stop12h 36m

$208

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Mon 5/12

7:00 am-11:15 am

1 stop7h 15m

Ontario

Fri 5/16

12:16 pm-9:59 pm

1 stop6h 43m

$215

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Thu 5/15

7:31 am-5:45 pm

1 stop13h 14m

Ontario

Tue 5/20

1:08 pm-6:31 am

1 stop14h 23m

$216

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Wed 6/4

9:00 am-3:50 pm

1 stop9h 50m

Ontario

Tue 6/10

7:20 pm-7:36 am

1 stop9h 16m

$292

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Wed 9/10

7:20 am-2:09 pm

1 stop9h 49m

Ontario

Tue 9/16

3:04 pm-6:00 am

1 stop11h 56m

$306

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Tue 8/26

5:55 am-11:07 am

1 stop8h 12m

Ontario

Sat 8/30

7:00 am-6:26 pm

1 stop8h 26m

$307

BaltimoreOntario

BWI - ONT

BWIONT

Baltimore/Washington

Mon 6/2

5:20 pm-11:50 pm

1 stop9h 30m

Ontario

Sat 6/7

4:45 pm-6:29 am

1 stop10h 44m

$318

BaltimoreOntario

BWI - ONT

BWIONT

Baltimore/Washington

Wed 5/21

7:18 pm-11:43 pm

1 stop7h 25m

Ontario

Wed 5/28

10:40 pm-9:56 am

1 stop8h 16m

$319

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Tue 6/3

9:00 am-3:50 pm

1 stop9h 50m

Ontario

Tue 6/10

7:20 pm-7:36 am

1 stop9h 16m

$326

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/1

Showing 1-10 of 56 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 May 1, 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 May 1, 2025.
Get a feel of what it's like to fly with Alaska Airlines, Southwest 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.
Alaska Airlines
8.0
Very good
9,972 reviews

Boarding

8.1

Comfort

7.9

Overall

8.0

Entertainment

7.1

Food

7.1

Crew

8.5

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
9,972 reviews
Alaska Airlines
8.0
Very good
9,972 reviews

Boarding

8.1

Comfort

7.9

Overall

8.0

Entertainment

7.1

Food

7.1

Crew

8.5

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
4,293 reviews
Alaska Airlines
8.0
Very good
9,972 reviews

Boarding

8.1

Comfort

7.9

Overall

8.0

Entertainment

7.1

Food

7.1

Crew

8.5

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
7,934 reviews
Alaska Airlines
8.0
Very good
9,972 reviews

Boarding

8.1

Comfort

7.9

Overall

8.0

Entertainment

7.1

Food

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Hawaiian Airlines
7.9
Good
2,409 reviews
Alaska Airlines
8.0
Very good
9,972 reviews

Boarding

8.1

Comfort

7.9

Overall

8.0

Entertainment

7.1

Food

7.1

Crew

8.5

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
8,696 reviews
Alaska Airlines
8.0
Very good
9,972 reviews

Boarding

8.1

Comfort

7.9

Overall

8.0

Entertainment

7.1

Food

7.1

Crew

8.5

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.

  • 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 ($94), Alaska Airlines ($138), and Delta ($154).

  • 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 $414. On average you can expect to pay $513. The most popular route, (Washington, D.C. Dulles Intl - Ontario), can usually be booked for $208.

  • 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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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 May 1, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$180Average$252FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$222Average$515FlexibilityNo cancel feeOn-time69%
DeltaCheapest$306Average$458FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$321Average$550FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$336Average$471FlexibilityNo cancel feeOn-time63%

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