HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
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 4/6. Fares are subject to change and may not be available on all flights or dates of travel.
BWI — ONT
Apr 18 — Apr 251
Sat 4/18
Sat 4/25
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Maryland to Ontario with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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 March 19, 2026.

This Trip.com deal was found by Cheapflights users on 3/14. 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 4/146:00 am
PHL
-
ONT
1 stop7h 44m
Frontier
Mon 4/2712:59 am
ONT
-
PHL
1 stop25h 35m
Frontier
Deal found 3/14$208
This Mytrip deal was found by Cheapflights users on 3/17. 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.
Wed 5/65:17 pm
BWI
-
ONT
1 stop17h 18m
Frontier
Wed 5/138:06 pm
ONT
-
BWI
1 stop21h 17m
Frontier
Deal found 3/17$210
This Frontier deal was found by Cheapflights users on 3/17. 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 4/228:41 pm
PHL
-
ONT
1 stop13h 50m
Frontier
Tue 4/287:44 pm
ONT
-
PHL
1 stop8h 06m
Frontier
Deal found 3/17$210
This Frontier deal was found by Cheapflights users on 3/17. 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 4/211:59 pm
DCA
-
ONT
1 stop12h 56m
Frontier
Mon 4/2712:59 am
ONT
-
DCA
1 stop9h 01m
Frontier
Deal found 3/17$210
This Booking.com deal was found by Cheapflights users on 3/18. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/288:36 pm
PHL
-
ONT
1 stop30h 19m
Frontier
Tue 5/510:50 am
ONT
-
PHL
1 stop15h 47m
Frontier
Deal found 3/18$212
This Trip.com deal was found by Cheapflights users on 3/14. 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 4/218:00 am
PHL
-
ONT
1 stop29h 44m
Frontier
Mon 4/2712:59 am
ONT
-
PHL
1 stop25h 35m
Frontier
Deal found 3/14$214
This Frontier deal was found by Cheapflights users on 3/14. 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 5/26:00 pm
DCA
-
ONT
1 stop8h 55m
Frontier
Tue 5/126:00 am
ONT
-
DCA
1 stop12h 58m
Frontier
Deal found 3/14$214
This Frontier deal was found by Cheapflights users on 3/18. 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 4/143:06 pm
BWI
-
ONT
1 stop8h 33m
Frontier
Fri 4/178:26 am
ONT
-
BWI
1 stop8h 49m
Frontier
Deal found 3/18$215
This Frontier deal was found by Cheapflights users on 3/16. 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 5/510:40 am
PHL
-
ONT
1 stop8h 04m
Frontier
Fri 5/88:30 am
ONT
-
PHL
1 stop10h 44m
Frontier
Deal found 3/16$215
This Frontier deal was found by Cheapflights users on 3/17. 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 4/141:59 pm
DCA
-
ONT
1 stop12h 56m
Frontier
Fri 4/1712:59 am
ONT
-
DCA
1 stop9h 01m
Frontier
Deal found 3/17$215
This Mytrip deal was found by Cheapflights users on 3/17. 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.
Wed 4/158:41 pm
PHL
-
ONT
1 stop13h 50m
Frontier
Tue 4/217:44 pm
ONT
-
PHL
1 stop8h 06m
Frontier
Deal found 3/17$216
This Mytrip deal was found by Cheapflights users on 3/16. 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.
Wed 4/296:00 pm
DCA
-
ONT
1 stop8h 55m
Frontier
Wed 5/610:50 am
ONT
-
DCA
1 stop23h 09m
Frontier
Deal found 3/16$216

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 March 19, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$208
(Trip.com)

One-way from

$94
(Trip.com)

Popular in

December

Cheapest in

September

Average price

$477

Good round-trip deal

$398 or less

Good one-way deal

$250 or less
Provider with most accurate pricing for Washington, D.C. (WAS)-Los Angeles Los Angeles flight deals.
Search Deals
Provider most trusted by Cheapflights users for Washington, D.C. (WAS)-Los Angeles 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. 8% potential increase in price ($34 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($11 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 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 March 19, 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

Thu 4/16

8:41 pm-7:31 am

1 stop13h 50m

Ontario

Sun 4/19

5:12 pm-5:34 am

1 stop9h 22m

$290

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Wed 6/3

2:23 pm-9:48 pm

1 stop10h 25m

Ontario

Wed 6/10

5:05 pm-5:43 am

1 stop9h 38m

$337

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Mon 4/13

5:00 pm-11:05 pm

2 stops9h 05m

Ontario

Tue 4/21

11:55 pm-11:05 am

1 stop8h 10m

$364

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Mon 4/13

4:30 pm-9:15 pm

1 stop7h 45m

Ontario

Tue 4/21

10:30 am-11:40 pm

2 stops10h 10m

$364

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Wed 5/6

7:10 am-2:30 pm

1 stop10h 20m

Ontario

Sun 5/10

3:26 pm-5:50 am

1 stop11h 24m

$375

BaltimoreOntario

BWI - ONT

BWIONT

Baltimore/Washington

Mon 4/13

12:45 pm-3:15 pm

Nonstop5h 30m

Ontario

Tue 4/21

11:55 pm-11:50 am

2 stops8h 55m

$378

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Tue 4/28

7:10 am-10:32 pm

1 stop18h 22m

Ontario

Sat 5/2

10:39 am-12:09 am

1 stop10h 30m

$386

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Thu 4/23

7:10 am-11:59 pm

1 stop19h 49m

Ontario

Mon 4/27

7:59 pm-6:20 pm

1 stop19h 21m

$415

BaltimoreOntario

BWI - ONT

BWIONT

Baltimore/Washington

Wed 6/3

6:10 am-12:19 pm

2 stops9h 09m

Ontario

Wed 6/10

10:59 pm-9:15 am

1 stop7h 16m

$417

BaltimoreOntario

BWI - ONT

BWIONT

Baltimore/Washington

Fri 5/15

4:20 pm-10:40 pm

2 stops9h 20m

Ontario

Mon 5/18

11:55 pm-11:50 am

2 stops8h 55m

$444

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/15

Showing 1-10 of 60 resultsSorted by cheapest first
1
2
3
...
6

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 $77). Flying from Maryland to Ontario in March is currently the most expensive (average of $188). 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 March 19, 2026.

Unlike at noon, when flights are generally more expensive, you can save up to 24% on flights from Maryland to Ontario by exploring options for tickets in the evening.

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 9h 05m. Fly via Frontier, Delta, or Southwest to get the fastest option. There are 2258 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), Southwest ($168), and United Airlines ($172).

  • 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 $199. On average you can expect to pay $356. The most popular route, (Washington, D.C. Dulles Intl - Ontario), can usually be booked for $250.

  • 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 $77). Flying from Maryland to Ontario in March is currently the most expensive (average of $188). 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Maryland to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
Newark to San Francisco flights
John F Kennedy Intl to San Francisco flights
LaGuardia to San Francisco flights
John F Kennedy Intl to Los Angeles flights
John F Kennedy Intl to Las Vegas flights
Dallas/Fort Worth to Las Vegas flights
Seattle to Las Vegas flights
Seattle to Los Angeles flights
Newark to Los Angeles flights
Newark to Las Vegas flights
San Francisco to Las Vegas flights
O'Hare Intl to Las Vegas flights
San Francisco to Los Angeles flights
Dulles Intl to Las Vegas flights
Dallas/Fort Worth to Los Angeles flights
LaGuardia to Las Vegas flights
LaGuardia to Los Angeles flights
Los Angeles to San Francisco flights
Denver to Las Vegas flights
San Francisco to Ontario flights
Boston to Las Vegas flights
O'Hare Intl to Los Angeles flights
Los Angeles to Las Vegas flights
Dulles Intl to Los Angeles flights
Ontario to San Francisco flights
Seattle to Ontario flights
Reagan-National to Los Angeles flights
San Francisco to Santa Ana flights
Atlanta to Las Vegas flights
Baltimore to Los Angeles flights
Dallas/Fort Worth to San Francisco flights
Boston to Los Angeles flights
Santa Ana to San Francisco flights
Baltimore to Las Vegas flights
Boston to San Francisco flights
Atlanta to Los Angeles flights
Reagan-National to Las Vegas flights
O'Hare Intl to San Francisco flights
Denver to Los Angeles flights
Burbank to Las Vegas flights
Minneapolis to Las Vegas flights
Seattle to San Francisco flights
Seattle to San Diego flights
Dallas/Fort Worth to Ontario flights
Philadelphia to Las Vegas flights
San Francisco to San Diego flights
Santa Ana to Las Vegas flights
Detroit to Las Vegas flights
Orlando to Las Vegas flights
Hobby to Las Vegas flights

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 March 19, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$195Average$265FlexibilityNo cancel feeOn-time62%
DeltaCheapest$266Average$410FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$336Average$472FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$344Average$392FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$346Average$442FlexibilityNo cancel feeOn-time63%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.