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$63+ 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 2/25. Fares are subject to change and may not be available on all flights or dates of travel.
BWI — ONT
ene. 26 — feb. 21
dom. 1/26
dom. 2/2
1 adult, Economy
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Cheap flight deals from Maryland to Ontario

Discover tips and strategies to find the most affordable flight options for your journey from Maryland (USMD) to Ontario (ONT). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated enero 21, 2025.

Round-trip from

$129
(Flightnetwork)

One-way from

$63
(Trip.com)
From Maryland to Ontario
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One-way flight from Maryland to Ontario
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Find 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 enero 21, 2025.

This Flightnetwork deal was found by Cheapflights users on 1/20. 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 Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 2/228:00 amPHL - ONT
1 stop14h 09mFrontier
sáb. 3/18:09 pmONT - PHL
1 stop12h 17mFrontier
Deal found 1/20$129
This CheapOair deal was found by Cheapflights users on 1/20. 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.
mié. 4/28:49 pmBWI - ONT
1 stop13h 40mFrontier
jue. 4/104:15 pmONT - BWI
1 stop16h 12mFrontier
Deal found 1/20$140
This Frontier deal was found by Cheapflights users on 1/21. 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.
jue. 1/301:01 pmDCA - ONT
1 stop13h 46mFrontier
lun. 2/310:40 amONT - DCA
1 stop8h 19mFrontier
Deal found 1/21$257
This Expedia deal was found by Cheapflights users on 1/21. 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.
vie. 4/254:56 pmBWI - ONT
1 stop10h 03mMultiple Airlines
lun. 4/286:24 pmONT - BWI
1 stop8h 22mMultiple Airlines
Deal found 1/21$304
This Delta deal was found by Cheapflights users on 1/20. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 2/34:53 pmIAD - ONT
1 stop8h 59mDelta
mar. 2/111:00 pmONT - IAD
1 stop8h 22mDelta
Deal found 1/20$324
This Delta deal was found by Cheapflights users on 1/20. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 2/35:15 pmBWI - ONT
1 stop8h 37mDelta
mar. 2/117:05 amONT - BWI
1 stop8h 07mDelta
Deal found 1/20$326
This Delta deal was found by Cheapflights users on 1/20. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 2/193:50 pmDCA - ONT
1 stop10h 02mDelta
sáb. 3/17:05 amONT - DCA
1 stop9h 33mDelta
Deal found 1/20$327
This American Airlines deal was found by Cheapflights users on 1/20. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 2/255:13 pmIAD - ONT
1 stop8h 03mAmerican Airlines
mié. 3/56:05 amONT - IAD
1 stop7h 07mAmerican Airlines
Deal found 1/20$328
This American Airlines deal was found by Cheapflights users on 1/20. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 2/66:06 amDCA - ONT
1 stop10h 45mAmerican Airlines
mar. 2/116:00 amONT - DCA
2 stops8h 59mAmerican Airlines
Deal found 1/20$332
This Delta deal was found by Cheapflights users on 1/21. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 4/146:40 pmPHL - ONT
1 stop8h 05mDelta
mar. 4/2210:59 pmONT - PHL
1 stop7h 28mDelta
Deal found 1/21$343
This Southwest deal was found by Cheapflights users on 1/20. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 2/153:00 pmBWI - ONT
1 stop10h 20mSouthwest
sáb. 2/228:20 amONT - BWI
2 stops9h 20mSouthwest
Deal found 1/20$348
This United Airlines deal was found by Cheapflights users on 1/21. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 3/103:13 pmPHL - ONT
1 stop8h 44mUnited Airlines
mar. 3/186:45 pmONT - PHL
2 stops13h 03mUnited Airlines
Deal found 1/21$348

Find flights from Maryland to Ontario within your budget

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 enero 21, 2025.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

sáb. 2/22

8:00 am-7:09 pm

1 stop14h 09m

Ontario

sáb. 3/1

8:09 pm-11:26 am

1 stop12h 17m

$129

BaltimoreOntario

BWI - ONT

BWIONT

Baltimore/Washington

mié. 4/2

8:49 pm-7:29 am

1 stop13h 40m

Ontario

jue. 4/10

4:15 pm-11:27 am

1 stop16h 12m

$140

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

dom. 2/16

6:00 pm-11:54 pm

1 stop8h 54m

Ontario

sáb. 2/22

12:59 am-12:03 pm

1 stop8h 04m

$260

BaltimoreOntario

BWI - ONT

BWIONT

Baltimore/Washington

vie. 4/25

4:56 pm-11:59 pm

1 stop10h 03m

Ontario

lun. 4/28

6:24 pm-5:46 am

1 stop8h 22m

$304

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

lun. 2/3

4:53 pm-10:52 pm

1 stop8h 59m

Ontario

mar. 2/11

1:00 pm-12:22 am

1 stop8h 22m

$324

BaltimoreOntario

BWI - ONT

BWIONT

Baltimore/Washington

lun. 2/3

5:15 pm-10:52 pm

1 stop8h 37m

Ontario

mar. 2/11

7:05 am-6:12 pm

1 stop8h 07m

$326

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

mié. 2/19

3:50 pm-10:52 pm

1 stop10h 02m

Ontario

sáb. 3/1

7:05 am-7:38 pm

1 stop9h 33m

$327

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

mar. 2/25

5:13 pm-10:16 pm

1 stop8h 03m

Ontario

mié. 3/5

6:05 am-4:12 pm

1 stop7h 07m

$328

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

jue. 2/6

6:06 am-1:51 pm

1 stop10h 45m

Ontario

mar. 2/11

6:00 am-5:59 pm

2 stops8h 59m

$332

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

lun. 4/14

6:40 pm-11:45 pm

1 stop8h 05m

Ontario

mié. 4/23

6:00 am-5:47 pm

1 stop8h 47m

$343

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/20

Showing 1-10 of 46 results
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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.

Travel insights for flights from Maryland to Ontario

Get recent, data-driven insights about flights from Maryland to Ontario including ideal travel times, pricing trends, and more.

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

Currently, August is the cheapest month in which you can book a flight from Maryland to Ontario (average of $246). Flying from Maryland to Ontario in March is currently the most expensive (average of $310). 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 enero 21, 2025.

When flying from Maryland to Ontario, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Rainfall in Ontario by month

Plan your trip to Ontario by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Ontario ranges from 0.1 - 3.4 inches per month. February is typically the wettest month, when rainfall can reach 3.4 in. June is typically the driest time to visit Ontario when rainfall is around 0.1 in.

Temperature in Ontario by month

Plan your trip to Ontario by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Ontario, use this chart to help with planning. For those seeking warmer temperatures, August is the ideal time of year to visit, when temperatures reach an average of 78.8 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 53.6 F).

Reviews of airlines servicing Ontario

Get insights into the airlines that provide service to Ontario. 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 Ontario. Reviews last updated enero 21, 2025.
Get a feel of what it's like to fly with United Airlines, Frontier and Delta from Maryland to Ontario by reading reviews from past customers. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.1
Very good
4,662 reviews

Comfort

8.1

Crew

8.7

Food

7.2

Boarding

8.2

Entertainment

7.7

Overall

8.1

Reviews

1 / 10

No issues. I needed pre boarding and I was able to get it without issue

Southwest
8.1
Very good
4,662 reviews
Southwest
8.1
Very good
4,662 reviews

Comfort

8.1

Crew

8.7

Food

7.2

Boarding

8.2

Entertainment

7.7

Overall

8.1

Reviews

1 / 10

No issues. I needed pre boarding and I was able to get it without issue

Alaska Airlines
8.0
Very good
9,706 reviews
Southwest
8.1
Very good
4,662 reviews

Comfort

8.1

Crew

8.7

Food

7.2

Boarding

8.2

Entertainment

7.7

Overall

8.1

Reviews

1 / 10

No issues. I needed pre boarding and I was able to get it without issue

Delta
8.0
Very good
8,521 reviews
Southwest
8.1
Very good
4,662 reviews

Comfort

8.1

Crew

8.7

Food

7.2

Boarding

8.2

Entertainment

7.7

Overall

8.1

Reviews

1 / 10

No issues. I needed pre boarding and I was able to get it without issue

United Airlines
7.4
Good
8,985 reviews
Southwest
8.1
Very good
4,662 reviews

Comfort

8.1

Crew

8.7

Food

7.2

Boarding

8.2

Entertainment

7.7

Overall

8.1

Reviews

1 / 10

No issues. I needed pre boarding and I was able to get it without issue

American Airlines
7.2
Good
10,000 reviews
Southwest
8.1
Very good
4,662 reviews

Comfort

8.1

Crew

8.7

Food

7.2

Boarding

8.2

Entertainment

7.7

Overall

8.1

Reviews

1 / 10

No issues. I needed pre boarding and I was able to get it without issue

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.

  • 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 ($63), Delta ($164), and American Airlines ($169).

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

    When deciding which route to take from Maryland to Ontario consider Baltimore/Washington - Ontario, Washington, D.C. Reagan-National - Ontario or Washington, D.C. Dulles Intl - Ontario as they are the most popular.

  • 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, August is the cheapest month in which you can book a flight from Maryland to Ontario (average of $246). Flying from Maryland to Ontario in March is currently the most expensive (average of $310). 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 enero 21, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$154Average$248FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$286Average$534FlexibilityNo cancel feeOn-time69%
DeltaCheapest$306Average$457FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$321Average$541FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$326Average$494FlexibilityNo cancel feeOn-time63%
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