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$160+ Cheap flights from Ontario (ONT) to Costa Rica

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 9/1. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SJO
Jul 8 — Jul 151
Tue 7/8
Tue 7/15
1 adult, Economy
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Cheap flight deals from Ontario to Costa Rica

Keep the following information in mind while searching for Ontario to Costa Rica flight deals. Data was last updated July 3, 2025.

Round-trip from

$346
(United Airlines)

One-way from

$160
(United Airlines)

Popular in

December

Cheapest in

May

Average price

$510
From Ontario to Costa Rica
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One-way flight from Ontario to Costa Rica
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Highest demand for flights based on searches. 17% potential increase in price ($100 potential increase over avg. RT price).
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Cheapest flight prices on average. 5% potential price decrease ($24 potential savings vs. average RT price).
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Average for round-trip flights in July 2025
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Find flight deals from Ontario to Costa Rica

Cheapest flights from Ontario to Costa Rica
Explore the most affordable flight options available from Ontario to Costa Rica. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 3, 2025.

This United Airlines deal was found by Cheapflights users on 7/1. 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.
Sat 11/16:38 pmONT - SJO
2 stops15h 47mUnited Airlines
Sat 11/89:40 amSJO - ONT
1 stop9h 54mUnited Airlines
Deal found 7/1$346
This American Airlines deal was found by Cheapflights users on 6/30. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/166:10 amONT - SJO
1 stop11h 05mAmerican Airlines
Wed 8/277:25 amSJO - ONT
1 stop16h 23mAmerican Airlines
Deal found 6/30$352
This CheapOair deal was found by Cheapflights users on 7/1. 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.
Sun 11/231:02 amONT - SJO
1 stop20h 51mMultiple Airlines
Sun 11/304:13 pmSJO - ONT
1 stop8h 59mMultiple Airlines
Deal found 7/1$386
This Priceline deal was found by Cheapflights users on 7/3. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/1611:25 pmONT - SJO
1 stop10h 50mAvianca
Thu 9/253:05 pmSJO - ONT
1 stop7h 50mAvianca
Deal found 7/3$432
This JetBlue deal was found by Cheapflights users on 7/3. 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/1711:59 pmONT - LIR
1 stop12h 06mJetBlue
Tue 8/262:10 pmLIR - ONT
1 stop32h 49mJetBlue
Deal found 7/3$490
This American Airlines deal was found by Cheapflights users on 7/2. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/2611:59 pmONT - LIR
1 stop12h 01mAmerican Airlines
Sat 8/22:00 pmLIR - ONT
1 stop9h 34mAmerican Airlines
Deal found 7/2$547
This Delta deal was found by Cheapflights users on 7/1. 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.
Mon 12/81:00 pmONT - LIR
2 stops21h 43mDelta
Tue 12/233:55 pmLIR - ONT
1 stop20h 43mDelta
Deal found 7/1$565
This Southwest deal was found by Cheapflights users on 7/1. 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.
Sat 7/269:20 pmONT - LIR
1 stop13h 15mSouthwest
Sat 8/22:30 pmLIR - ONT
1 stop9h 30mSouthwest
Deal found 7/1$592
This United Airlines deal was found by Cheapflights users on 7/2. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/235:05 amONT - LIR
1 stop9h 20mUnited Airlines
Sun 7/2711:49 amLIR - ONT
1 stop10h 05mUnited Airlines
Deal found 7/2$647
This Alaska Airlines deal was found by Cheapflights users on 7/2. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/26:00 amONT - LIR
2 stops22h 45mAlaska Airlines
Tue 12/167:45 pmLIR - ONT
3 stops23h 08mAlaska Airlines
Deal found 7/2$764

Cheapflights Fare Finder

Customize your flight search to find flights from Ontario to Costa Rica 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 July 3, 2025.
Use the filters below to find and compare flights from Ontario to Costa Rica that are best for you.

Fly from

Ontario

Fly to

Costa Rica

Route

Depart

Return

Price

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Sat 11/1

6:38 pm-11:25 am

2 stops15h 47m

San José Juan Santamaria Intl

Sat 11/8

9:40 am-5:34 pm

1 stop9h 54m

$346

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Sat 8/16

6:10 am-6:15 pm

1 stop11h 05m

San José Juan Santamaria Intl

Wed 8/27

7:25 am-10:48 pm

1 stop16h 23m

$352

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Sun 11/23

1:02 am-11:53 pm

1 stop20h 51m

San José Juan Santamaria Intl

Sun 11/30

4:13 pm-11:12 pm

1 stop8h 59m

$386

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Tue 9/16

11:25 pm-11:15 am

1 stop10h 50m

San José Juan Santamaria Intl

Thu 9/25

3:05 pm-9:55 pm

1 stop7h 50m

$432

OntarioLiberia

ONT - LIR

ONTLIR

Ontario

Sun 8/17

11:59 pm-1:05 pm

1 stop12h 06m

Liberia

Tue 8/26

2:10 pm-9:59 pm

1 stop32h 49m

$490

OntarioLiberia

ONT - LIR

ONTLIR

Ontario

Sat 7/26

11:59 pm-1:00 pm

1 stop12h 01m

Liberia

Sat 8/2

2:00 pm-10:34 pm

1 stop9h 34m

$547

OntarioLiberia

ONT - LIR

ONTLIR

Ontario

Mon 12/8

1:00 pm-12:43 pm

2 stops21h 43m

Liberia

Tue 12/23

3:55 pm-10:38 am

1 stop20h 43m

$565

OntarioLiberia

ONT - LIR

ONTLIR

Ontario

Sat 7/26

9:20 pm-11:35 am

1 stop13h 15m

Liberia

Sat 8/2

2:30 pm-11:00 pm

1 stop9h 30m

$592

OntarioLiberia

ONT - LIR

ONTLIR

Ontario

Wed 7/23

5:05 am-3:25 pm

1 stop9h 20m

Liberia

Sun 7/27

11:49 am-8:54 pm

1 stop10h 05m

$647

OntarioLiberia

ONT - LIR

ONTLIR

Ontario

Tue 12/2

6:00 am-6:45 am

2 stops22h 45m

Liberia

Tue 12/16

7:45 pm-4:53 pm

3 stops23h 08m

$764

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/1

Showing 1-10 of 20 results
1
2

Best time to book a flight from Ontario to Costa Rica

Have a flexible travel schedule? Discover the best time to fly to Costa Rica 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 Costa Rica

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

Currently, September is the cheapest month in which you can book a flight from Ontario to Costa Rica (average of $398). Flying from Ontario to Costa Rica in March is currently the most expensive (average of $555). 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 CR?

Find hourly flight availability from Ontario to Costa Rica. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated July 3, 2025.

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

Reviews of airlines servicing Costa Rica

Get insights into the airlines that provide service to Costa Rica. 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 Costa Rica. Reviews last updated July 3, 2025.
See what other customers who have flown with Alaska Airlines, Southwest, and Delta from Ontario to Costa Rica have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Boarding

8.1

Overall

8.0

Entertainment

7.1

Crew

8.5

Food

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Boarding

8.1

Overall

8.0

Entertainment

7.1

Crew

8.5

Food

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Southwest
8.0
Very good
4,270 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Boarding

8.1

Overall

8.0

Entertainment

7.1

Crew

8.5

Food

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Delta
8.0
Very good
7,970 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Boarding

8.1

Overall

8.0

Entertainment

7.1

Crew

8.5

Food

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
United Airlines
7.4
Good
8,845 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Boarding

8.1

Overall

8.0

Entertainment

7.1

Crew

8.5

Food

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
JetBlue
7.3
Good
2,916 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Boarding

8.1

Overall

8.0

Entertainment

7.1

Crew

8.5

Food

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

Related info for your journey

Find useful and relevant information for your journey from Ontario to Costa Rica. 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 Costa Rica?

    If you book a flight to Costa Rica from Ontario, you will be flying from Ontario, which is the city’s only airport. Ontario (ONT) is located 3.1 mi from the center of Ontario.

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

    To fly one-way, consider booking your trip with United Airlines, which is currently one of the cheapest options available, starting at $160. American Airlines flights start at $174 while deals on Iberia start at $183 one-way.

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

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

  • How can I find direct flights from Ontario to Costa Rica?

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

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

    Yes. Cheapflights offers flight deals from Ontario to Costa Rica 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 Costa Rica?

    Currently, September is the cheapest month in which you can book a flight from Ontario to Costa Rica (average of $398). Flying from Ontario to Costa Rica in March is currently the most expensive (average of $555). 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 Costa Rica

See prices for flight routes from nearby airports that may be better suited for you.
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Top 4 airlines flying from Ontario to Costa Rica

Discover the top 4 airlines that operate flights from Ontario to Costa Rica. 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 July 3, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$349Average$652FlexibilityNo cancel feeOn-time69%
AviancaCheapest$384Average$492FlexibilityNo cancel feeOn-time71%
American AirlinesCheapest$419Average$652FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$616Average$698FlexibilityNo cancel feeOn-time63%

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