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Ontario

$84+ 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 8/19. Fares are subject to change and may not be available on all flights or dates of travel.
BWI — ONT
Jul 6 — Jul 131
Mon 7/6
Mon 7/13
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 June 6, 2026.

This Frontier deal was found by Cheapflights users on 6/2. 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 7/212:21 pm
BWI
-
ONT
1 stop7h 27m
Frontier
Wed 7/89:32 am
ONT
-
BWI
1 stop8h 04m
Frontier
Deal found 6/2$232
This Frontier deal was found by Cheapflights users on 6/5. 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 7/212:21 pm
BWI
-
ONT
1 stop7h 27m
Frontier
Sat 7/119:32 am
ONT
-
BWI
1 stop8h 04m
Frontier
Deal found 6/5$242
This Frontier deal was found by Cheapflights users on 6/5. 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 7/274:44 pm
BWI
-
ONT
1 stop17h 48m
Frontier
Wed 8/59:36 am
ONT
-
BWI
1 stop8h 03m
Frontier
Deal found 6/5$243
This Mytrip deal was found by Cheapflights users on 6/4. 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.
Sat 7/45:36 pm
BWI
-
ONT
1 stop16h 46m
Frontier
Sat 7/119:32 am
ONT
-
BWI
1 stop8h 04m
Frontier
Deal found 6/4$244
This Flightnetwork deal was found by Cheapflights users on 6/4. 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 Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/35:32 pm
BWI
-
ONT
1 stop27h 20m
Frontier
Sat 7/119:32 am
ONT
-
BWI
1 stop8h 04m
Frontier
Deal found 6/4$251
This Frontier deal was found by Cheapflights users on 6/2. 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 7/212:21 pm
BWI
-
ONT
1 stop7h 27m
Frontier
Thu 7/99:32 am
ONT
-
BWI
1 stop8h 04m
Frontier
Deal found 6/2$252
This Booking.com deal was found by Cheapflights users on 6/4. 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.
Fri 7/244:44 pm
BWI
-
ONT
1 stop17h 48m
Frontier
Wed 7/299:32 am
ONT
-
BWI
1 stop8h 04m
Frontier
Deal found 6/4$254
This Booking.com deal was found by Cheapflights users on 6/1. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/224:44 pm
BWI
-
ONT
1 stop17h 48m
Frontier
Wed 7/299:32 am
ONT
-
BWI
1 stop8h 04m
Frontier
Deal found 6/1$259
This Gotogate deal was found by Cheapflights users on 6/2. 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 8/84:44 pm
BWI
-
ONT
1 stop17h 48m
Frontier
Sat 8/159:32 am
ONT
-
BWI
1 stop8h 04m
Frontier
Deal found 6/2$262
This Booking.com deal was found by Cheapflights users on 6/4. 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.
Wed 7/224:44 pm
BWI
-
ONT
1 stop17h 48m
Frontier
Mon 7/279:32 am
ONT
-
BWI
1 stop8h 04m
Frontier
Deal found 6/4$264
This Booking.com deal was found by Cheapflights users on 6/2. 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.
Fri 7/244:44 pm
BWI
-
ONT
1 stop17h 48m
Frontier
Mon 7/279:32 am
ONT
-
BWI
1 stop8h 04m
Frontier
Deal found 6/2$269
This Expedia deal was found by Cheapflights users on 6/4. 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.
Wed 6/2411:00 am
PHL
-
ONT
1 stop11h 51m
Frontier
Mon 6/2911:58 am
ONT
-
PHL
1 stop15h 29m
Frontier
Deal found 6/4$306

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 June 6, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$232
(Frontier)

One-way from

$84
(Trip.com)

Popular in

March

Cheapest in

September

Average price

$425

Good round-trip deal

$471 or less

Good one-way deal

$209 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 ($49 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($12 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in June 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 June 6, 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

Wed 6/24

11:00 am-7:51 pm

1 stop11h 51m

Ontario

Sun 6/28

6:47 pm-10:30 am

1 stop12h 43m

$316

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Tue 8/18

6:00 am-10:42 am

1 stop7h 42m

Ontario

Mon 8/24

10:00 pm-9:10 am

1 stop8h 10m

$331

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Tue 10/27

9:35 am-6:00 pm

1 stop11h 25m

Ontario

Mon 11/2

4:09 pm-5:51 am

1 stop10h 42m

$331
Quickest round-trip

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Sat 8/22

6:00 am-10:42 am

1 stop7h 42m

Ontario

Wed 8/26

12:00 pm-10:44 pm

1 stop7h 44m

$331

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Tue 9/22

7:00 am-2:16 pm

1 stop10h 16m

Ontario

Wed 9/30

12:12 pm-11:59 pm

1 stop8h 47m

$351

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Thu 10/29

7:00 am-1:19 pm

1 stop9h 19m

Ontario

Mon 11/2

4:09 pm-5:51 am

1 stop10h 42m

$351

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Thu 10/29

7:00 am-1:19 pm

1 stop9h 19m

Ontario

Tue 11/3

4:09 pm-5:51 am

1 stop10h 42m

$351

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Fri 8/21

6:00 am-10:42 am

1 stop7h 42m

Ontario

Mon 8/24

10:00 pm-9:10 am

1 stop8h 10m

$367

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Fri 7/10

5:00 am-11:20 am

2 stops9h 20m

Ontario

Tue 7/14

10:10 am-9:25 pm

2 stops8h 15m

$391

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Sun 9/13

6:00 am-11:04 am

1 stop8h 04m

Ontario

Fri 9/18

11:59 am-12:32 am

1 stop9h 33m

$391

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/3

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, October is the cheapest month in which you can book a flight from Maryland to Ontario (average of $43). Flying from Maryland to Ontario in September is currently the most expensive (average of $372). 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 June 6, 2026.

Unlike in the afternoon, when flights are generally more expensive, you can save up to 26% 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?

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 42m. Fly via Frontier, Delta, or Alaska Airlines 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 $151. On average you can expect to pay $425. The most popular route, (Washington, D.C. Dulles Intl - Ontario), can usually be booked for $269.

  • 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, October is the cheapest month in which you can book a flight from Maryland to Ontario (average of $43). Flying from Maryland to Ontario in September is currently the most expensive (average of $372). 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 4 airlines flying from Maryland to Ontario

Discover the top 4 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 June 6, 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$192Average$450FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$222Average$450FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$346Average$465FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$460Average$505FlexibilityNo cancel feeOn-time71%

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