Maryland

$80+ Cheap flights from Ontario (ONT) to Maryland

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 5/24. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BWI
Jun 3 — Jun 101
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Cheap flight deals from Ontario to Maryland

Cheapest flights from Ontario to Maryland
Explore the most affordable flight options available from Ontario to Maryland. Find the lowest fares from popular airlines and budget airlines, with prices last updated on May 4, 2026.

This Trip.com deal was found by Cheapflights users on 5/2. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/276:00 am
ONT
-
PHL
1 stop20h 37m
Frontier
Wed 6/1011:00 am
PHL
-
ONT
1 stop11h 51m
Frontier
Deal found 5/2$179
This Frontier deal was found by Cheapflights users on 4/29. 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.
Sun 5/246:00 am
ONT
-
DCA
1 stop12h 58m
Frontier
Wed 5/271:59 pm
DCA
-
ONT
1 stop12h 50m
Frontier
Deal found 4/29$185
This Frontier deal was found by Cheapflights users on 5/3. 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 5/264:39 pm
ONT
-
PHL
1 stop10h 42m
Frontier
Mon 6/110:40 am
PHL
-
ONT
1 stop11h 52m
Frontier
Deal found 5/3$190
This Booking.com deal was found by Cheapflights users on 5/2. 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.
Wed 5/206:00 am
ONT
-
PHL
1 stop20h 37m
Frontier
Sat 5/238:35 pm
PHL
-
ONT
1 stop16h 30m
Frontier
Deal found 5/2$193
This Trip.com deal was found by Cheapflights users on 4/29. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/204:39 pm
ONT
-
IAD
1 stop12h 33m
Frontier
Wed 5/279:12 am
IAD
-
ONT
1 stop9h 32m
Frontier
Deal found 4/29$197
This Expedia deal was found by Cheapflights users on 4/29. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/2310:50 am
ONT
-
PHL
1 stop15h 47m
Frontier
Tue 5/268:35 pm
PHL
-
ONT
1 stop30h 14m
Frontier
Deal found 4/29$205
This Frontier deal was found by Cheapflights users on 4/29. 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.
Sun 5/2410:50 am
ONT
-
DCA
1 stop8h 08m
Frontier
Fri 5/291:59 pm
DCA
-
ONT
1 stop12h 50m
Frontier
Deal found 4/29$205
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.
Wed 5/276:00 am
ONT
-
PHL
1 stop20h 37m
Frontier
Thu 5/288:35 pm
PHL
-
ONT
1 stop16h 30m
Frontier
Deal found 4/30$206
This Trip.com deal was found by Cheapflights users on 4/29. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/204:39 pm
ONT
-
IAD
1 stop12h 33m
Frontier
Sun 5/249:12 am
IAD
-
ONT
1 stop25h 52m
Frontier
Deal found 4/29$207
This Mytrip deal was found by Cheapflights users on 4/29. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/96:00 am
ONT
-
PHL
1 stop26h 47m
Frontier
Tue 6/2312:42 pm
PHL
-
ONT
1 stop14h 07m
Frontier
Deal found 4/29$210
This CheapOair deal was found by Cheapflights users on 4/29. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/268:06 pm
ONT
-
BWI
1 stop21h 12m
Frontier
Tue 6/24:29 pm
BWI
-
ONT
1 stop18h 06m
Frontier
Deal found 4/29$210
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/46:00 am
ONT
-
DCA
1 stop7h 59m
Frontier
Tue 8/186:00 pm
DCA
-
ONT
1 stop8h 49m
Frontier
Deal found 4/30$210

Find flight deals from Ontario to Maryland

Keep the following information in mind while searching for Ontario to Maryland flight deals. Data was last updated May 4, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$179
(Trip.com)

One-way from

$80
(Gotogate)

Popular in

March

Cheapest in

August

Average price

$360

Good round-trip deal

$462 or less

Good one-way deal

$224 or less
Provider with most accurate pricing for Los Angeles-Washington, D.C. (WAS) flight deals.
Provider most trusted by Cheapflights users for Los Angeles-Washington, D.C. (WAS) flights.
From Ontario to Maryland
One-way flight from Ontario to Maryland
Highest demand for flights based on searches. 9% potential increase in price ($41 potential increase over avg. RT price).
Cheapest flight prices on average. 2% potential price decrease ($12 potential savings vs. average RT price).
Average for round-trip flights in May 2026
Price to beat on a round-trip flight from Ontario to Maryland.
Price to beat on a one-way flight from Ontario to Maryland.

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ontario to Maryland 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 4, 2026.
Use the filters below to find and compare flights from Ontario to Maryland that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Mon 8/17

10:00 pm-9:19 am

1 stop8h 19m

Washington, D.C. Dulles Intl

Thu 8/20

12:30 pm-6:29 pm

1 stop8h 59m

$321

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Wed 9/16

12:00 pm-11:24 pm

1 stop8h 24m

Washington, D.C. Reagan-National

Tue 9/29

6:00 am-6:01 pm

2 stops15h 01m

$326

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Mon 9/28

9:39 am-9:15 pm

1 stop8h 36m

Philadelphia

Thu 10/1

3:48 pm-8:52 pm

1 stop8h 04m

$327

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Wed 9/23

1:50 pm-11:50 pm

1 stop7h 00m

Philadelphia

Mon 9/28

10:20 am-4:10 pm

1 stop8h 50m

$343

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Tue 7/14

2:50 pm-1:00 am

1 stop7h 10m

Philadelphia

Tue 7/21

4:35 pm-10:45 pm

2 stops9h 10m

$354

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Mon 8/17

10:59 pm-9:38 am

1 stop7h 39m

Philadelphia

Thu 8/27

6:45 am-11:04 am

1 stop7h 19m

$357

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Fri 8/14

10:59 pm-9:50 am

1 stop7h 51m

Washington, D.C. Dulles Intl

Tue 8/18

6:00 am-11:04 am

1 stop8h 04m

$359

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Tue 6/2

4:03 pm-5:35 am

1 stop10h 32m

Philadelphia

Wed 6/3

4:45 pm-11:56 pm

1 stop10h 11m

$361

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Mon 9/28

5:15 am-5:55 pm

2 stops9h 40m

Philadelphia

Thu 10/1

4:40 pm-10:35 pm

1 stop8h 55m

$366

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Wed 9/30

3:12 pm-5:40 am

1 stop11h 28m

Washington, D.C. Dulles Intl

Sun 10/4

7:00 am-2:47 pm

1 stop10h 47m

$371

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/2

Showing 1-10 of 60 resultsSorted by cheapest first
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6

Best time to book a flight from Ontario to Maryland

Have a flexible travel schedule? Discover the best time to fly to Maryland from Ontario 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 Ontario to Maryland

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

The best time to book flights from Ontario to Maryland is 46 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

What is the cheapest month to book a flight from Ontario to Maryland?

Currently, June is the cheapest month in which you can book a flight from Ontario to Maryland (average of $72). Flying from Ontario to Maryland in November is currently the most expensive (average of $326). 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 ONT to MD?

Find hourly flight availability from Ontario to Maryland. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated May 4, 2026.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Ontario to Maryland as you normally would.

Weekly flight availability from Ontario to Maryland

Explore weekly flight availability from Ontario to Maryland. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated May 4, 2026.

The most flights from ONT to USMD are scheduled on a Monday (1 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (1 on average).

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

Reviews of airlines servicing Maryland

Get insights into the airlines that provide service to Maryland. 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 Maryland. Reviews last updated May 4, 2026.
Read reviews from past customers who have flown Southwest,Delta, andUnited Airlines from Ontario to Maryland. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

Entertainment

7.5

Comfort

8.0

Crew

8.6

Overall

7.9

Food

7.0

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.

Entertainment

7.5

Comfort

8.0

Crew

8.6

Overall

7.9

Food

7.0

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.

Entertainment

7.5

Comfort

8.0

Crew

8.6

Overall

7.9

Food

7.0

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.

Entertainment

7.5

Comfort

8.0

Crew

8.6

Overall

7.9

Food

7.0

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.

Entertainment

7.5

Comfort

8.0

Crew

8.6

Overall

7.9

Food

7.0

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.

Entertainment

7.5

Comfort

8.0

Crew

8.6

Overall

7.9

Food

7.0

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.

Related info for your journey

Find useful and relevant information for your journey from Ontario to Maryland. 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 from for flights from Ontario to Maryland?

    Located just 3.1 mi from the city center, Ontario (ONT) is the airport most travelers will use when flying to Maryland from Ontario.

  • How popular is this Ontario to Maryland flight route?

  • How long is the flight from Ontario to Maryland?

    Frontier, Delta, and United Airlines can get you from Ontario to Maryland in just under 8h 19m. Your travel time can differ by up to 4h 39m. There are 2236 mi between Ontario and Maryland. This flight may include one or multiple stops.

  • What are the cheapest airlines to fly from Ontario to Maryland one-way?

    For one-way options, check prices for American Airlines. According to our data, you can fly for as low as $138. Users have also found prices from $138 and $163 on Delta and Southwest, respectively.

  • What are the most popular routes from Ontario to Maryland?

  • What are the cheapest flights from Ontario to Maryland?

    The cheapest flight price from Ontario to Maryland is $188. On average you can expect to pay $428. The most popular route, (Ontario - Washington, D.C. Dulles Intl), can usually be booked for $216.

  • Can I find deals for flights from Ontario to Maryland that include hotel bookings?

    Yes. In addition to deals on Ontario to Maryland flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Ontario to Maryland?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ontario to Maryland.

  • Can I find deals for business class flights from Ontario to Maryland?

    Yes. Cheapflights offers flight deals from Ontario to Maryland 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 Ontario to Maryland?

    Currently, June is the cheapest month in which you can book a flight from Ontario to Maryland (average of $72). Flying from Ontario to Maryland in November is currently the most expensive (average of $326). 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 Ontario to Maryland

See prices for flight routes from nearby airports that may be better suited for you.

Top 5 airlines flying from Ontario to Maryland

Discover the top 5 airlines that operate flights from Ontario to Maryland. 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 4, 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$128Average$356FlexibilityNo cancel feeOn-timeN/A
FrontierCheapest$136Average$252FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$256Average$393FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$339Average$486FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$351Average$544FlexibilityNo cancel feeOn-time71%

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