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$64+ 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 3/3. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BWI
Feb 28 — Mar 71
Sat 2/28
Sat 3/7
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 January 29, 2026.

This Kiwi.com deal was found by Cheapflights users on 1/28. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/38:40 am
ONT
-
DCA
1 stop10h 19m
Frontier
Sat 3/76:00 pm
DCA
-
ONT
1 stop8h 59m
Frontier
Deal found 1/28$134
This Frontier deal was found by Cheapflights users on 1/28. 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.
Sat 2/216:00 am
ONT
-
DCA
1 stop7h 59m
Frontier
Wed 2/252:00 pm
DCA
-
ONT
1 stop10h 34m
Frontier
Deal found 1/28$148
This Trip.com deal was found by Cheapflights users on 1/29. 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.
Sat 2/286:00 am
ONT
-
DCA
1 stop7h 59m
Frontier
Tue 3/32:00 pm
DCA
-
ONT
1 stop10h 34m
Frontier
Deal found 1/29$153
This Frontier deal was found by Cheapflights users on 1/28. 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.
Mon 2/236:10 am
ONT
-
DCA
1 stop12h 49m
Frontier
Sat 2/282:00 pm
DCA
-
ONT
1 stop12h 59m
Frontier
Deal found 1/28$158
This Frontier deal was found by Cheapflights users on 1/27. 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.
Thu 2/192:08 pm
ONT
-
DCA
1 stop20h 07m
Frontier
Wed 2/258:00 am
DCA
-
ONT
1 stop16h 34m
Frontier
Deal found 1/27$160
This Frontier deal was found by Cheapflights users on 1/27. 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.
Sat 2/146:00 am
ONT
-
DCA
1 stop7h 59m
Frontier
Sat 2/282:00 pm
DCA
-
ONT
1 stop12h 59m
Frontier
Deal found 1/27$164
This CheapOair deal was found by Cheapflights users on 1/27. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/192:08 pm
ONT
-
DCA
1 stop20h 07m
Frontier
Tue 2/248:00 am
DCA
-
ONT
1 stop16h 34m
Frontier
Deal found 1/27$169
This Kiwi.com deal was found by Cheapflights users on 1/28. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/86:15 am
ONT
-
DCA
1 stop27h 47m
Frontier
Tue 3/108:00 am
DCA
-
ONT
1 stop18h 59m
Frontier
Deal found 1/28$173
This Mytrip deal was found by Cheapflights users on 1/27. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/192:08 pm
ONT
-
PHL
1 stop24h 47m
Frontier
Mon 2/235:47 pm
PHL
-
ONT
1 stop9h 12m
Frontier
Deal found 1/27$174
This Mytrip deal was found by Cheapflights users on 1/27. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/262:08 pm
ONT
-
DCA
1 stop19h 52m
Frontier
Mon 3/26:00 pm
DCA
-
ONT
1 stop8h 59m
Frontier
Deal found 1/27$174
This CheapOair deal was found by Cheapflights users on 1/27. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/308:26 am
ONT
-
PHL
1 stop12h 13m
Frontier
Mon 5/43:41 pm
PHL
-
ONT
1 stop10h 43m
Frontier
Deal found 1/27$180
This Trip.com deal was found by Cheapflights users on 1/27. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/192:08 pm
ONT
-
PHL
1 stop24h 47m
Frontier
Thu 2/266:00 am
PHL
-
ONT
1 stop11h 29m
Frontier
Deal found 1/27$185

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 January 29, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$134
(Kiwi.com)

One-way from

$64
(Trip.com)

Popular in

December

Cheapest in

February

Average price

$364

Good round-trip deal

$488 or less

Good one-way deal

$224 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. 14% potential increase in price ($58 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($10 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
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 January 29, 2026.
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

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Sat 3/7

6:15 am-9:59 pm

1 stop12h 44m

Washington, D.C. Reagan-National

Tue 3/10

2:00 pm-1:28 pm

2 stops26h 28m

$212

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Thu 4/30

8:26 am-11:39 pm

1 stop12h 13m

Philadelphia

Mon 5/4

3:41 pm-11:24 pm

1 stop10h 43m

$220

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Wed 3/4

8:40 am-4:37 pm

1 stop28h 57m

Philadelphia

Sun 3/8

8:25 pm-11:59 pm

1 stop30h 34m

$243

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Mon 3/9

6:15 am-5:31 am

1 stop20h 16m

Philadelphia

Thu 3/12

5:05 am-11:59 pm

2 stops21h 54m

$278

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Tue 3/17

10:25 pm-9:10 am

1 stop7h 45m

Washington, D.C. Reagan-National

Tue 3/24

3:50 pm-9:00 pm

1 stop8h 10m

$297

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Wed 4/15

10:15 pm-9:15 am

1 stop8h 00m

Washington, D.C. Dulles Intl

Wed 4/22

6:00 am-11:36 am

1 stop8h 36m

$297

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Wed 4/15

12:49 pm-11:41 pm

1 stop7h 52m

Washington, D.C. Reagan-National

Tue 4/21

8:29 am-6:33 pm

2 stops13h 04m

$302

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Wed 4/15

12:49 pm-11:41 pm

1 stop7h 52m

Washington, D.C. Reagan-National

Wed 4/22

11:00 am-6:33 pm

2 stops10h 33m

$302

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Sat 3/7

10:20 pm-8:10 am

1 stop6h 50m

Washington, D.C. Dulles Intl

Tue 3/10

5:32 pm-11:51 pm

2 stops9h 19m

$302

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Thu 2/26

2:06 pm-9:25 am

1 stop16h 19m

Washington, D.C. Dulles Intl

Thu 3/5

6:52 pm-6:14 pm

1 stop26h 22m

$317

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/28

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.

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 January 29, 2026.
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
8.0
Very good
4,267 reviews

Comfort

8.0

Entertainment

7.5

Food

7.0

Boarding

8.1

Crew

8.6

Overall

8.0

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
8.0
Very good
4,267 reviews
Southwest
8.0
Very good
4,267 reviews

Comfort

8.0

Entertainment

7.5

Food

7.0

Boarding

8.1

Crew

8.6

Overall

8.0

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
8,128 reviews
Southwest
8.0
Very good
4,267 reviews

Comfort

8.0

Entertainment

7.5

Food

7.0

Boarding

8.1

Crew

8.6

Overall

8.0

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
9,215 reviews
Southwest
8.0
Very good
4,267 reviews

Comfort

8.0

Entertainment

7.5

Food

7.0

Boarding

8.1

Crew

8.6

Overall

8.0

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
11,205 reviews
Southwest
8.0
Very good
4,267 reviews

Comfort

8.0

Entertainment

7.5

Food

7.0

Boarding

8.1

Crew

8.6

Overall

8.0

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
5.7
Fair
3,056 reviews
Southwest
8.0
Very good
4,267 reviews

Comfort

8.0

Entertainment

7.5

Food

7.0

Boarding

8.1

Crew

8.6

Overall

8.0

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 and Delta can get you from Ontario to Maryland in just under 7h 45m. Your travel time can differ by up to 4h 59m. There are 2258 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 $163 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 - Washington, D.C. Dulles Intl, Ontario - Washington, D.C. Reagan-National and Ontario - Baltimore/Washington.

  • What are the cheapest flights from Ontario to Maryland?

    The cheapest flight price from Ontario to Maryland is $201. On average you can expect to pay $428. The most popular route, (Ontario - Washington, D.C. Dulles Intl), can usually be booked for $244.

  • 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.

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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 January 29, 2026.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$72Average$224FlexibilityNo cancel feeOn-time65%
FrontierCheapest$136Average$228FlexibilityNo cancel feeOn-time62%
DeltaCheapest$208Average$400FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$276Average$441FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$311Average$544FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$337Average$472FlexibilityNo cancel feeOn-time63%

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