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$61+ 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 1/13. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BWI
Jan 17 — Jan 241
Sat 1/17
Sat 1/24
1 adult, Economy
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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 December 18, 2025.

This CheapOair deal was found by Cheapflights users on 12/15. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/256:00 amONT - PHL
1 stop20h 40mFrontier
Sat 1/37:10 amPHL - ONT
1 stop19h 11mFrontier
Deal found 12/15$209
This CheapOair deal was found by Cheapflights users on 12/16. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/236:00 amONT - PHL
1 stop20h 40mFrontier
Thu 1/18:36 pmPHL - ONT
1 stop30h 23mFrontier
Deal found 12/16$234
This Frontier deal was found by Cheapflights users on 12/16. 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.
Thu 12/256:45 amONT - DCA
1 stop7h 14mFrontier
Wed 1/76:00 pmDCA - ONT
1 stop8h 14mFrontier
Deal found 12/16$253
This Frontier deal was found by Cheapflights users on 12/16. 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 12/246:45 amONT - DCA
1 stop12h 14mFrontier
Sat 1/106:00 pmDCA - ONT
1 stop8h 14mFrontier
Deal found 12/16$254
This CheapOair deal was found by Cheapflights users on 12/17. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/308:19 amONT - PHL
1 stop14h 05mFrontier
Sat 1/37:10 amPHL - ONT
1 stop19h 11mFrontier
Deal found 12/17$255
This CheapOair deal was found by Cheapflights users on 12/15. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/246:00 amONT - PHL
1 stop20h 40mFrontier
Fri 1/27:10 amPHL - ONT
1 stop17h 07mFrontier
Deal found 12/15$259
This Frontier deal was found by Cheapflights users on 12/15. 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.
Thu 12/256:07 pmONT - PHL
1 stop8h 33mFrontier
Fri 1/27:10 amPHL - ONT
1 stop12h 59mFrontier
Deal found 12/15$262
This Booking.com deal was found by Cheapflights users on 12/17. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/266:45 amONT - DCA
1 stop27h 16mFrontier
Wed 1/76:00 pmDCA - ONT
1 stop8h 14mFrontier
Deal found 12/17$265
This Frontier deal was found by Cheapflights users on 12/16. 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.
Sat 12/205:16 pmONT - PHL
1 stop9h 24mFrontier
Fri 1/912:51 pmPHL - ONT
1 stop14h 05mFrontier
Deal found 12/16$268
This Frontier deal was found by Cheapflights users on 12/16. 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 12/246:45 amONT - DCA
1 stop12h 14mFrontier
Fri 1/96:00 pmDCA - ONT
1 stop8h 56mFrontier
Deal found 12/16$268
This Frontier deal was found by Cheapflights users on 12/16. 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.
Thu 12/256:45 amONT - DCA
1 stop12h 14mFrontier
Sat 1/106:00 pmDCA - ONT
1 stop8h 14mFrontier
Deal found 12/16$274
This Frontier deal was found by Cheapflights users on 12/16. 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 12/246:45 amONT - DCA
1 stop12h 14mFrontier
Tue 1/62:00 pmDCA - ONT
1 stop11h 12mFrontier
Deal found 12/16$278

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 December 18, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$133
(Kiwi.com)

One-way from

$61
(Trip.com)

Popular in

December

Cheapest in

August

Average price

$477

Good round-trip deal

$533 or less

Good one-way deal

$218 or less
Provider with most accurate pricing for Los Angeles-Washington, D.C. (WAS) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Los Angeles-Washington, D.C. (WAS) flights.
Search Deals
From Ontario to Maryland
Search Deals
One-way flight from Ontario to Maryland
Search Deals
Highest demand for flights based on searches. 13% potential increase in price ($59 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($11 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals
Price to beat on a round-trip flight from Ontario to Maryland.
Search Deals
Price to beat on a one-way flight from Ontario to Maryland.
Search Deals

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 December 18, 2025.
Use the filters below to find and compare flights from Ontario to Maryland that are best for you.

Fly from

Ontario

Fly to

Maryland

Route

Depart

Return

Price

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Tue 12/30

8:19 am-1:24 am

1 stop14h 05m

Philadelphia

Sat 1/3

7:10 am-11:21 pm

1 stop19h 11m

$234

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Fri 1/9

8:31 am-12:07 pm

1 stop24h 36m

Baltimore/Washington

Sun 1/11

8:08 pm-9:23 pm

1 stop28h 15m

$245

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Fri 1/16

8:32 am-12:03 pm

1 stop24h 31m

Baltimore/Washington

Wed 1/21

8:08 pm-12:20 am

2 stops31h 12m

$272

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Thu 1/1

6:45 am-5:31 am

1 stop19h 46m

Philadelphia

Fri 1/9

12:51 pm-11:56 pm

1 stop14h 05m

$289

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Thu 2/5

7:30 am-11:44 pm

2 stops13h 14m

Baltimore/Washington

Sun 2/8

1:02 pm-10:44 pm

2 stops12h 42m

$296

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Mon 2/2

6:20 am-9:59 pm

1 stop12h 39m

Washington, D.C. Reagan-National

Fri 2/13

1:00 pm-11:59 pm

1 stop13h 59m

$301

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Thu 2/5

6:00 am-4:26 pm

1 stop31h 26m

Washington, D.C. Dulles Intl

Sun 2/8

6:04 pm-10:59 am

1 stop19h 55m

$306

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Wed 1/28

11:53 am-4:26 pm

1 stop25h 33m

Washington, D.C. Dulles Intl

Sun 2/8

6:04 pm-10:59 am

1 stop19h 55m

$306

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Fri 2/6

11:53 am-4:26 pm

1 stop25h 33m

Washington, D.C. Dulles Intl

Sun 2/8

6:04 pm-10:59 am

1 stop19h 55m

$306

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Sat 2/7

7:30 am-11:10 pm

1 stop12h 40m

Washington, D.C. Dulles Intl

Mon 2/9

7:30 am-10:44 pm

1 stop18h 14m

$307

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/16

Showing 1-10 of 60 results
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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 December is currently the most expensive (average of $179). 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 December 18, 2025.

Unlike in the evening, when flights are generally more expensive, you can save up to 38% on flights from Ontario to Maryland by exploring options for tickets at noon.

What is the cheapest day to fly from Ontario to Maryland?

Use this chart to determine the cheapest time to fly round-trip from Ontario to Maryland. Price data was last updated on December 13, 2025.

Travelers seeking maximum savings on their Ontario to Maryland flight should consider departing on Tuesday afternoons when fares are most often at their lowest. Thursday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

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 December 18, 2025.
Read reviews from past customers who have flown Southwest, Delta, and United Airlines from Ontario to Maryland. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Southwest
7.9
Good
4,250 reviews

Comfort

8.0

Crew

8.6

Food

7.0

Boarding

8.1

Overall

7.9

Entertainment

7.5

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.
Southwest
7.9
Good
4,250 reviews
Southwest
7.9
Good
4,250 reviews

Comfort

8.0

Crew

8.6

Food

7.0

Boarding

8.1

Overall

7.9

Entertainment

7.5

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.
Delta
7.9
Good
8,005 reviews
Southwest
7.9
Good
4,250 reviews

Comfort

8.0

Crew

8.6

Food

7.0

Boarding

8.1

Overall

7.9

Entertainment

7.5

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.
United Airlines
7.4
Good
9,091 reviews
Southwest
7.9
Good
4,250 reviews

Comfort

8.0

Crew

8.6

Food

7.0

Boarding

8.1

Overall

7.9

Entertainment

7.5

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.
American Airlines
7.2
Good
11,054 reviews
Southwest
7.9
Good
4,250 reviews

Comfort

8.0

Crew

8.6

Food

7.0

Boarding

8.1

Overall

7.9

Entertainment

7.5

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.
Frontier
5.8
Fair
3,081 reviews
Southwest
7.9
Good
4,250 reviews

Comfort

8.0

Crew

8.6

Food

7.0

Boarding

8.1

Overall

7.9

Entertainment

7.5

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?

    This flight path from Ontario to Maryland was viewed by 7 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 Ontario to Maryland?

    Frontier, Delta, and Alaska Airlines can get you from Ontario to Maryland in just under 13h 14m. Your travel time can differ by up to 18h 12m. There are 2276 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 $65. Users have also found prices from $144 and $159 on Delta and Southwest, respectively.

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

    The most popular flight routes from Ontario to Maryland are Ontario - Baltimore/Washington, Ontario - Washington, D.C. Dulles Intl and Ontario - Washington, D.C. Reagan-National.

  • What are the cheapest flights from Ontario to Maryland?

    The cheapest flight price from Ontario to Maryland is $196. On average you can expect to pay $445. The most popular route, (Ontario - Baltimore/Washington), can usually be booked for $217.

  • 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 December is currently the most expensive (average of $179). 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.
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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 December 18, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$98Average$224FlexibilityNo cancel feeOn-time65%
FrontierCheapest$175Average$240FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$276Average$441FlexibilityNo cancel feeOn-time69%
DeltaCheapest$276Average$441FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$337Average$470FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$346Average$508FlexibilityNo cancel feeOn-time71%

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