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Ontario

$80+ 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 5/26. Fares are subject to change and may not be available on all flights or dates of travel.
BWI — ONT
May 29 — Jun 51
Fri 5/29
Fri 6/5
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 April 29, 2026.

This CheapOair deal was found by Cheapflights users on 4/25. 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.
Sat 5/235:34 pm
BWI
-
ONT
1 stop16h 34m
Frontier
Tue 5/268:06 pm
ONT
-
BWI
1 stop21h 12m
Frontier
Deal found 4/25$160
This Mytrip deal was found by Cheapflights users on 4/28. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/194:31 pm
BWI
-
ONT
1 stop18h 04m
Frontier
Tue 5/268:06 pm
ONT
-
BWI
1 stop21h 12m
Frontier
Deal found 4/28$172
This CheapOair deal was found by Cheapflights users on 4/25. 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.
Sat 5/165:34 pm
BWI
-
ONT
1 stop17h 01m
Frontier
Tue 5/198:06 pm
ONT
-
BWI
1 stop21h 12m
Frontier
Deal found 4/25$185
This Frontier deal was found by Cheapflights users on 4/28. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/269:12 am
IAD
-
ONT
1 stop9h 32m
Frontier
Tue 6/24:39 pm
ONT
-
IAD
1 stop12h 33m
Frontier
Deal found 4/28$185
This Expedia deal was found by Cheapflights users on 4/28. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/269:12 am
IAD
-
ONT
1 stop9h 32m
Frontier
Mon 6/811:51 am
ONT
-
IAD
1 stop17h 34m
Frontier
Deal found 4/28$190
This Booking.com deal was found by Cheapflights users on 4/24. 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 5/269:12 am
IAD
-
ONT
1 stop9h 32m
Frontier
Tue 6/163:34 pm
ONT
-
IAD
1 stop13h 51m
Frontier
Deal found 4/24$192
This CheapOair deal was found by Cheapflights users on 4/24. 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.
Sat 5/95:34 pm
BWI
-
ONT
1 stop17h 01m
Frontier
Tue 5/128:06 pm
ONT
-
BWI
1 stop21h 12m
Frontier
Deal found 4/24$200
This Booking.com deal was found by Cheapflights users on 4/25. 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.
Sat 5/95:34 pm
BWI
-
ONT
1 stop17h 01m
Frontier
Wed 5/138:06 pm
ONT
-
BWI
1 stop21h 12m
Frontier
Deal found 4/25$202
This Gotogate deal was found by Cheapflights users on 4/27. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/124:31 pm
BWI
-
ONT
1 stop18h 04m
Frontier
Tue 5/198:06 pm
ONT
-
BWI
1 stop21h 12m
Frontier
Deal found 4/27$205
This CheapOair deal was found by Cheapflights users on 4/25. 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.
Sat 5/166:00 pm
DCA
-
ONT
1 stop8h 49m
Frontier
Tue 5/1910:50 am
ONT
-
DCA
1 stop23h 09m
Frontier
Deal found 4/25$205
This Frontier deal was found by Cheapflights users on 4/27. 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.
Tue 5/269:12 am
IAD
-
ONT
1 stop9h 32m
Frontier
Fri 5/293:30 pm
ONT
-
IAD
1 stop13h 42m
Frontier
Deal found 4/27$205
This Booking.com deal was found by Cheapflights users on 4/24. 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.
Sat 5/165:34 pm
BWI
-
ONT
1 stop17h 01m
Frontier
Sat 5/235:59 pm
ONT
-
BWI
1 stop23h 19m
Frontier
Deal found 4/24$207

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 April 29, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$160
(CheapOair)

One-way from

$80
(Frontier)

Popular in

March

Cheapest in

September

Average price

$407

Good round-trip deal

$419 or less

Good one-way deal

$239 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. 13% potential increase in price ($57 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($14 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 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 April 29, 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

Fri 7/24

5:15 am-10:38 am

1 stop8h 23m

Ontario

Mon 8/3

10:00 pm-9:31 am

1 stop8h 31m

$306

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Thu 8/6

6:00 am-10:38 am

1 stop7h 38m

Ontario

Sat 8/29

7:00 am-5:07 pm

1 stop7h 07m

$321

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Sat 8/22

6:00 am-11:04 am

1 stop8h 04m

Ontario

Sat 8/29

7:00 am-5:07 pm

1 stop7h 07m

$321

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Tue 7/28

5:15 am-10:38 am

1 stop8h 23m

Ontario

Fri 7/31

5:10 pm-6:15 am

1 stop10h 05m

$327

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Thu 5/28

3:00 pm-11:34 pm

2 stops11h 34m

Ontario

Thu 6/4

6:00 am-6:40 pm

2 stops9h 40m

$331

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Wed 6/10

1:42 pm-11:49 pm

2 stops13h 07m

Ontario

Wed 7/8

5:10 pm-8:40 am

2 stops12h 30m

$331

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Tue 7/7

5:15 am-11:30 am

2 stops9h 15m

Ontario

Tue 7/14

2:50 pm-1:00 am

1 stop7h 10m

$333

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Wed 5/20

5:38 pm-11:58 pm

1 stop9h 20m

Ontario

Fri 6/5

7:41 pm-7:34 am

1 stop8h 53m

$341

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Fri 8/21

7:00 am-11:04 am

1 stop7h 04m

Ontario

Thu 8/27

6:00 am-4:21 pm

1 stop7h 21m

$341

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Thu 5/28

7:00 am-3:09 pm

1 stop11h 09m

Ontario

Wed 6/10

5:54 pm-6:13 am

1 stop9h 19m

$356

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/25

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 April 29, 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 evening.

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 8h 23m. Fly via Frontier, Delta, or Southwest 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), 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 $189. On average you can expect to pay $409. The most popular route, (Washington, D.C. Dulles Intl - Ontario), can usually be booked for $210.

  • 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 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 April 29, 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$192Average$450FlexibilityNo cancel feeOn-timeN/A
FrontierCheapest$198Average$265FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$344Average$411FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$346Average$448FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$351Average$497FlexibilityNo cancel feeOn-time71%

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