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Ontario

$110+ 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 8/20. Fares are subject to change and may not be available on all flights or dates of travel.
BWI — ONT
Sep 1 — Sep 81
Tue 9/1
Tue 9/8
1 adult, Economy
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Cheap 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 August 2, 2026.

This Frontier deal was found by Cheapflights users on 7/30. 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.
Mon 8/248:00 am
PHL
-
ONT
1 stop11h 22m
Frontier
Sat 8/293:40 pm
ONT
-
PHL
1 stop11h 50m
Frontier
Deal found 7/30$212
This Frontier deal was found by Cheapflights users on 7/30. 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.
Sat 8/298:00 am
PHL
-
ONT
1 stop10h 54m
Frontier
Sat 9/53:40 pm
ONT
-
PHL
1 stop11h 50m
Frontier
Deal found 7/30$214
This CheapOair deal was found by Cheapflights users on 7/30. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/37:00 am
PHL
-
ONT
1 stop12h 22m
Frontier
Mon 9/710:17 pm
ONT
-
PHL
1 stop29h 13m
Frontier
Deal found 7/30$222
This Expedia deal was found by Cheapflights users on 7/31. 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.
Sat 8/228:37 pm
PHL
-
ONT
1 stop16h 27m
Frontier
Mon 8/2410:17 pm
ONT
-
PHL
1 stop29h 13m
Frontier
Deal found 7/31$228
This Kiwi.com deal was found by Cheapflights users on 7/30. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/238:59 am
IAD
-
ONT
1 stop26h 04m
Frontier
Mon 8/243:40 pm
ONT
-
IAD
1 stop13h 24m
Frontier
Deal found 7/30$230
This Frontier deal was found by Cheapflights users on 7/29. 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.
Fri 8/288:00 am
PHL
-
ONT
1 stop11h 22m
Frontier
Tue 9/13:40 pm
ONT
-
PHL
1 stop11h 50m
Frontier
Deal found 7/29$231
This Frontier deal was found by Cheapflights users on 7/30. 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.
Tue 9/11:24 pm
BWI
-
ONT
1 stop8h 37m
Frontier
Wed 9/97:11 pm
ONT
-
BWI
1 stop13h 29m
Frontier
Deal found 7/30$232
This Frontier deal was found by Cheapflights users on 7/30. 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.
Wed 9/91:00 pm
DCA
-
ONT
1 stop13h 47m
Frontier
Sat 9/126:15 am
ONT
-
DCA
1 stop7h 44m
Frontier
Deal found 7/30$232
This Frontier deal was found by Cheapflights users on 7/30. 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.
Tue 9/88:59 am
IAD
-
ONT
1 stop9h 50m
Frontier
Mon 9/142:30 pm
ONT
-
IAD
1 stop12h 50m
Frontier
Deal found 7/30$232
This Kiwi.com deal was found by Cheapflights users on 7/28. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/208:59 am
IAD
-
ONT
1 stop26h 04m
Frontier
Thu 8/278:48 am
ONT
-
IAD
2 stops20h 16m
Frontier
Deal found 7/28$233
This Frontier deal was found by Cheapflights users on 7/30. 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 8/201:24 pm
BWI
-
ONT
1 stop21h 08m
Frontier
Wed 8/2610:59 am
ONT
-
BWI
1 stop30h 38m
Frontier
Deal found 7/30$234
This Frontier deal was found by Cheapflights users on 7/30. 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 8/206:00 pm
DCA
-
ONT
1 stop8h 50m
Frontier
Wed 8/266:00 am
ONT
-
DCA
1 stop12h 59m
Frontier
Deal found 7/30$234

Find flight deals from Maryland to Ontario

Keep the following information in mind while searching for Maryland to Ontario flight deals. Data was last updated August 2, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$212
(Frontier)

One-way from

$110
(Super.com)

Popular in

June

Cheapest in

September

Average price

$357

Good round-trip deal

$435 or less

Good one-way deal

$181 or less
Provider with most accurate pricing for Washington, D.C. (WAS)-Los Angeles flight deals.
Search Deals
Provider most trusted by Cheapflights users for Washington, D.C. (WAS)-Los Angeles flights.
Search Deals
From Maryland to Ontario
Search Deals
One-way flight from Maryland to Ontario
Search Deals
Highest demand for flights based on searches. 11% potential increase in price ($53 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($10 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in August 2026
Search Deals
Price to beat on a round-trip flight from Maryland to Ontario.
Search Deals
Price to beat on a one-way flight from Maryland to Ontario.
Search Deals

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 August 2, 2026.
Use the filters below to find and compare flights from Maryland to Ontario that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Sat 8/29

8:55 am-4:25 pm

2 stops10h 30m

Ontario

Sat 9/5

10:15 am-10:55 pm

2 stops9h 40m

$321

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Wed 10/21

6:35 am-11:06 am

1 stop7h 31m

Ontario

Tue 10/27

6:00 am-5:39 pm

1 stop8h 39m

$347

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Tue 9/15

3:05 pm-9:00 pm

2 stops8h 55m

Ontario

Tue 10/6

10:55 am-9:45 pm

2 stops7h 50m

$350

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Wed 10/7

4:02 pm-10:49 pm

1 stop9h 47m

Ontario

Wed 10/14

1:52 pm-1:06 am

1 stop8h 14m

$351

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Sat 11/7

6:00 am-11:06 am

1 stop8h 06m

Ontario

Wed 11/11

1:25 pm-11:37 pm

1 stop7h 12m

$351

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Thu 8/20

6:00 am-10:42 am

1 stop7h 42m

Ontario

Wed 8/26

12:00 pm-11:48 pm

1 stop8h 48m

$352

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Thu 8/20

6:00 am-10:42 am

1 stop7h 42m

Ontario

Wed 8/26

12:00 pm-12:34 am

1 stop9h 34m

$352

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Sat 8/22

9:25 am-4:00 pm

1 stop9h 35m

Ontario

Tue 8/25

8:30 am-8:55 pm

2 stops9h 25m

$356

BaltimoreOntario

BWI - ONT

BWIONT

Baltimore/Washington

Thu 11/5

6:10 pm-10:10 pm

1 stop7h 00m

Ontario

Mon 11/9

8:05 am-7:05 pm

2 stops8h 00m

$358

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Fri 8/21

6:20 am-12:00 pm

2 stops8h 40m

Ontario

Mon 8/24

11:55 pm-11:35 am

1 stop8h 40m

$366

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/29

Showing 1-10 of 60 resultsSorted by cheapest first
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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, November is the cheapest month in which you can book a flight from Maryland to Ontario (average of $352). Flying from Maryland to Ontario in July is currently the most expensive (average of $553). 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 August 2, 2026.

Unlike in the afternoon, when flights are generally more expensive, you can save up to 19% on flights from Maryland to Ontario by exploring options for tickets in the morning.

How much does it cost to fly round-trip from Maryland to Ontario?

Airfare is below average for this route at the moment.
Maryland to Ontario flights typically cost between $358 and $549 in August.
The cheapest round-trip price found within the last 5 days was $232 on Frontier (Aug 25-Aug 31).

How far ahead should I book a flight from Maryland to Ontario?

Booking 48 days in advance of your planned departure date is, on average, the best time to get cheap flights from Maryland to Ontario. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

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.

  • How long is the flight from Maryland to Ontario?

    There are many flights that can get you from Maryland to Ontario in 7h 31m. Fly via Frontier, Southwest, or Delta to get the fastest option. There are 2349 mi between Maryland and Ontario. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • 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 ($96), United Airlines ($172), and Southwest ($180).

  • 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, Philadelphia - 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 $181. On average you can expect to pay $688. The most popular route, (Washington, D.C. Dulles Intl - Ontario), can usually be booked for $232.

  • 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, November is the cheapest month in which you can book a flight from Maryland to Ontario (average of $352). Flying from Maryland to Ontario in July is currently the most expensive (average of $553). 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 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 August 2, 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$192Average$450FlexibilityNo cancel feeOn-timeN/A
FrontierCheapest$211Average$277FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$344Average$477FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$346Average$471FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$460Average$546FlexibilityNo cancel feeOn-time71%

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