Maryland

$83+ 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 4/21. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BWI
Apr 15 — Apr 221
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Ontario to Maryland 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 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 March 16, 2026.

This Trip.com deal was found by Cheapflights users on 3/11. 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.
Mon 4/2012:59 am
ONT
-
PHL
1 stop25h 35m
Frontier
Tue 5/128:35 pm
PHL
-
ONT
1 stop30h 14m
Frontier
Deal found 3/11$191
This Trip.com deal was found by Cheapflights users on 3/12. 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 4/1412:59 am
ONT
-
PHL
1 stop25h 35m
Frontier
Sun 4/193:27 pm
PHL
-
ONT
1 stop11h 29m
Frontier
Deal found 3/12$196
This Kiwi.com deal was found by Cheapflights users on 3/13. 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.
Mon 4/2012:59 am
ONT
-
PHL
1 stop25h 35m
Frontier
Fri 5/18:41 pm
PHL
-
ONT
1 stop30h 14m
Frontier
Deal found 3/13$200
This Kiwi.com deal was found by Cheapflights users on 3/13. 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.
Tue 4/2112:59 am
ONT
-
PHL
1 stop25h 35m
Frontier
Sat 5/28:41 pm
PHL
-
ONT
1 stop13h 45m
Frontier
Deal found 3/13$204
This Kiwi.com deal was found by Cheapflights users on 3/12. 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.
Fri 4/2412:59 am
ONT
-
DCA
1 stop9h 01m
Frontier
Sat 5/96:00 pm
DCA
-
ONT
1 stop8h 49m
Frontier
Deal found 3/12$206
This Kiwi.com deal was found by Cheapflights users on 3/13. 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.
Mon 4/2012:59 am
ONT
-
PHL
1 stop25h 35m
Frontier
Sun 5/38:36 pm
PHL
-
ONT
1 stop13h 55m
Frontier
Deal found 3/13$207
This Trip.com deal was found by Cheapflights users on 3/11. 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.
Mon 4/2012:59 am
ONT
-
PHL
1 stop25h 35m
Frontier
Fri 5/88:35 pm
PHL
-
ONT
1 stop30h 14m
Frontier
Deal found 3/11$208
This Vliegwinkel deal was found by Cheapflights users on 3/12. 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 Vliegwinkel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/112:59 am
ONT
-
DCA
1 stop9h 01m
Frontier
Sat 5/96:00 pm
DCA
-
ONT
1 stop8h 49m
Frontier
Deal found 3/12$208
This Trip.com deal was found by Cheapflights users on 3/12. 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.
Mon 4/1312:59 am
ONT
-
PHL
1 stop25h 35m
Frontier
Tue 4/218:36 pm
PHL
-
ONT
1 stop30h 19m
Frontier
Deal found 3/12$209
This Frontier deal was found by Cheapflights users on 3/15. 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 4/217:44 pm
ONT
-
PHL
1 stop8h 06m
Frontier
Wed 5/610:40 am
PHL
-
ONT
1 stop8h 04m
Frontier
Deal found 3/15$210
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.
Wed 4/85:18 pm
ONT
-
BWI
1 stop13h 16m
Frontier
Tue 4/143:06 pm
BWI
-
ONT
1 stop8h 33m
Frontier
Deal found 3/16$210
This Expedia 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/2012:59 am
ONT
-
DCA
1 stop9h 01m
Frontier
Tue 4/281:59 pm
DCA
-
ONT
1 stop12h 56m
Frontier
Deal found 3/16$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 March 16, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$191
(Trip.com)

One-way from

$83
(Trip.com)

Popular in

December

Cheapest in

August

Average price

$452

Good round-trip deal

$375 or less

Good one-way deal

$191 or less
Provider with most accurate pricing for Los Angeles Los Angeles-Washington, D.C. (WAS) flight deals.
Provider most trusted by Cheapflights users for Los Angeles 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. 13% potential increase in price ($56 potential increase over avg. RT price).
Cheapest flight prices on average. 2% potential price decrease ($8 potential savings vs. average RT price).
Average for round-trip flights in March 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 March 16, 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

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Wed 4/22

3:26 pm-5:44 am

1 stop11h 18m

Baltimore/Washington

Wed 5/6

7:04 am-2:30 pm

1 stop10h 26m

$337

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Thu 4/16

11:53 am-11:55 pm

1 stop9h 02m

Washington, D.C. Dulles Intl

Mon 4/20

6:00 am-11:36 am

1 stop8h 36m

$373
Quickest round-trip

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Wed 5/13

9:55 pm-5:40 am

Nonstop4h 45m

Baltimore/Washington

Sat 5/16

7:20 pm-10:00 pm

Nonstop5h 40m

$381

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Thu 6/4

10:50 am-5:37 am

1 stop15h 47m

Philadelphia

Sun 6/7

8:35 pm-11:49 pm

1 stop30h 14m

$390

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Wed 4/29

6:00 am-6:02 am

1 stop21h 02m

Philadelphia

Sat 5/2

6:58 pm-9:45 am

1 stop17h 47m

$405

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Thu 5/28

6:25 am-6:35 pm

2 stops9h 10m

Baltimore/Washington

Mon 6/1

4:20 pm-10:40 pm

2 stops9h 20m

$411

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Wed 4/15

1:27 pm-1:25 am

1 stop8h 58m

Washington, D.C. Dulles Intl

Sat 4/18

5:26 pm-10:31 pm

1 stop8h 05m

$437

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Wed 4/22

6:49 pm-8:15 am

1 stop10h 26m

Philadelphia

Sat 4/25

8:00 am-5:47 pm

2 stops12h 47m

$442

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Fri 4/17

10:15 pm-9:09 am

1 stop7h 54m

Washington, D.C. Reagan-National

Sat 4/25

12:00 pm-9:00 pm

2 stops12h 00m

$442

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Wed 4/29

6:49 pm-8:15 am

1 stop10h 26m

Philadelphia

Sat 5/2

10:00 am-8:36 pm

2 stops13h 36m

$442

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/16

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

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

Currently, August is the cheapest month in which you can book a flight from Ontario to Maryland (average of $93). Flying from Ontario to Maryland in March is currently the most expensive (average of $198). 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 March 16, 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 March 16, 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).

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 March 16, 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.

Comfort

8.0

Entertainment

7.5

Crew

8.6

Food

7.0

Overall

8.0

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.

Comfort

8.0

Entertainment

7.5

Crew

8.6

Food

7.0

Overall

8.0

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.

Comfort

8.0

Entertainment

7.5

Crew

8.6

Food

7.0

Overall

8.0

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.

Comfort

8.0

Entertainment

7.5

Crew

8.6

Food

7.0

Overall

8.0

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.

Comfort

8.0

Entertainment

7.5

Crew

8.6

Food

7.0

Overall

8.0

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.

Comfort

8.0

Entertainment

7.5

Crew

8.6

Food

7.0

Overall

8.0

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?

    Alaska Airlines, Delta, and Southwest can get you from Ontario to Maryland in just under 9h 02m. Your travel time can differ by up to 2h 16m. 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 Frontier. According to our data, you can fly for as low as $80. Users have also found prices from $138 and $149 on Delta and American Airlines, 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 $184. On average you can expect to pay $322. The most popular route, (Ontario - Washington, D.C. Dulles Intl), can usually be booked for $255.

  • 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, August is the cheapest month in which you can book a flight from Ontario to Maryland (average of $93). Flying from Ontario to Maryland in March is currently the most expensive (average of $198). 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 Ontario to Maryland

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

Top 6 airlines flying from Ontario to Maryland

Discover the top 6 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 March 16, 2026.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$72Average$234FlexibilityNo cancel feeOn-time65%
FrontierCheapest$136Average$252FlexibilityNo cancel feeOn-time62%
DeltaCheapest$183Average$427FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$256Average$388FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$311Average$544FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$339Average$475FlexibilityNo 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.