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$151+ 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 5/30. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SJO
Apr 6 — Apr 131
Sun 4/6
Sun 4/13
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 April 1, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$290
(CheapOair)

One-way from

$151
(CheapOair)

Popular in

December

Cheapest in

September

Average price

$446
Provider with most accurate pricing for Los Angeles-San José Juan Santamaria Intl flight deals.
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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 ($96 potential increase over avg. RT price).
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Cheapest flight prices on average. 5% potential price decrease ($23 potential savings vs. average RT price).
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Average for round-trip flights in April 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 April 1, 2025.

This CheapOair deal was found by Cheapflights users on 3/31. 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.
Mon 5/121:09 amONT - SJO
1 stop21h 05mMultiple Airlines
Sat 5/173:31 pmSJO - ONT
1 stop8h 42mMultiple Airlines
Deal found 3/31$290
This Priceline deal was found by Cheapflights users on 3/31. 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 5/1311:25 pmONT - SJO
1 stop10h 50mAvianca
Tue 5/203:05 pmSJO - ONT
1 stop7h 50mAvianca
Deal found 3/31$439
This American Airlines deal was found by Cheapflights users on 3/31. 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 5/1712:45 pmONT - SJO
1 stop8h 39mAmerican Airlines
Sat 5/2411:59 pmSJO - ONT
1 stop12h 51mAmerican Airlines
Deal found 3/31$451
This United Airlines deal was found by Cheapflights users on 3/31. 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.
Mon 6/96:41 pmONT - SJO
1 stop11h 34mUnited Airlines
Sat 6/147:55 amSJO - ONT
1 stop14h 15mUnited Airlines
Deal found 3/31$487
This American Airlines deal was found by Cheapflights users on 4/1. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/711:59 pmONT - LIR
1 stop13h 41mAmerican Airlines
Tue 6/173:40 pmLIR - ONT
1 stop9h 19mAmerican Airlines
Deal found 4/1$537
This Delta deal was found by Cheapflights users on 3/31. 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 8/1810:59 pmONT - SJO
1 stop11h 49mDelta
Thu 9/41:08 pmSJO - ONT
1 stop10h 21mDelta
Deal found 3/31$576
This United Airlines deal was found by Cheapflights users on 3/31. 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.
Mon 5/56:08 amONT - LIR
1 stop7h 15mUnited Airlines
Sun 5/258:45 amLIR - ONT
1 stop15h 00mUnited Airlines
Deal found 3/31$587
This Delta deal was found by Cheapflights users on 3/30. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/510:59 pmONT - LIR
1 stop11h 48mDelta
Thu 10/301:12 pmLIR - ONT
1 stop10h 29mDelta
Deal found 3/30$608
This Alaska Airlines deal was found by Cheapflights users on 4/1. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/77:30 amONT - LIR
3 stops21h 50mAlaska Airlines
Tue 6/174:58 pmLIR - ONT
2 stops32h 01mAlaska Airlines
Deal found 4/1$926
This Air Canada deal was found by Cheapflights users on 3/31. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/271:57 pmONT - LIR
2 stops21h 58mMultiple Airlines
Fri 1/22:40 pmLIR - ONT
2 stops28h 38mMultiple Airlines
Deal found 3/31$4,410

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 April 1, 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

Mon 5/12

1:09 am-11:14 pm

1 stop21h 05m

San José Juan Santamaria Intl

Sat 5/17

3:31 pm-11:13 pm

1 stop8h 42m

$290

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Tue 5/13

11:25 pm-11:15 am

1 stop10h 50m

San José Juan Santamaria Intl

Tue 5/20

3:05 pm-9:55 pm

1 stop7h 50m

$439

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Sat 5/17

12:45 pm-10:24 pm

1 stop8h 39m

San José Juan Santamaria Intl

Sat 5/24

11:59 pm-11:50 am

1 stop12h 51m

$451

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Mon 6/9

6:41 pm-7:15 am

1 stop11h 34m

San José Juan Santamaria Intl

Sat 6/14

7:55 am-9:10 pm

1 stop14h 15m

$487

OntarioLiberia

ONT - LIR

ONTLIR

Ontario

Sat 6/7

11:59 pm-2:40 pm

1 stop13h 41m

Liberia

Tue 6/17

3:40 pm-11:59 pm

1 stop9h 19m

$537

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Mon 8/18

10:59 pm-11:48 am

1 stop11h 49m

San José Juan Santamaria Intl

Thu 9/4

1:08 pm-10:29 pm

1 stop10h 21m

$576

OntarioLiberia

ONT - LIR

ONTLIR

Ontario

Mon 5/5

6:08 am-2:23 pm

1 stop7h 15m

Liberia

Sun 5/25

8:45 am-10:45 pm

1 stop15h 00m

$587

OntarioLiberia

ONT - LIR

ONTLIR

Ontario

Mon 7/28

5:53 pm-11:40 am

2 stops16h 47m

Liberia

Wed 8/6

1:04 pm-10:29 pm

1 stop10h 25m

$612

OntarioLiberia

ONT - LIR

ONTLIR

Ontario

Sat 6/7

7:30 am-6:20 am

3 stops21h 50m

Liberia

Tue 6/17

4:58 pm-11:59 pm

2 stops32h 01m

$926

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Fri 5/30

1:09 am-11:14 pm

1 stop21h 05m

$151

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/31

Showing 1-10 of 18 results
1
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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 April 1, 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.

Rainfall in Costa Rica by month

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

In terms of precipitation, rainfall in Costa Rica ranges from 0.0 - 11.8 inches per month. September is typically the wettest month, when rainfall can reach 11.8 in. February is typically the driest time to visit Costa Rica when rainfall is around 0.0 in.

Temperature in Costa Rica by month

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

If weather is an important factor for your trip to Costa Rica, use this chart to help with planning. For those seeking warmer temperatures, April is the ideal time of year to visit, when temperatures reach an average of 69.8 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 64.4 F).

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 April 1, 2025.
Read reviews from past customers who have flown Alaska Airlines, Delta and United Airlines from Ontario to Costa Rica. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
9,823 reviews

Overall

8.0

Entertainment

7.1

Food

7.1

Crew

8.5

Boarding

8.2

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Alaska Airlines
8.0
Very good
9,823 reviews
Alaska Airlines
8.0
Very good
9,823 reviews

Overall

8.0

Entertainment

7.1

Food

7.1

Crew

8.5

Boarding

8.2

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Delta
8.0
Very good
7,899 reviews
Alaska Airlines
8.0
Very good
9,823 reviews

Overall

8.0

Entertainment

7.1

Food

7.1

Crew

8.5

Boarding

8.2

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
United Airlines
7.4
Good
8,615 reviews
Alaska Airlines
8.0
Very good
9,823 reviews

Overall

8.0

Entertainment

7.1

Food

7.1

Crew

8.5

Boarding

8.2

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
JetBlue
7.3
Good
2,924 reviews
Alaska Airlines
8.0
Very good
9,823 reviews

Overall

8.0

Entertainment

7.1

Food

7.1

Crew

8.5

Boarding

8.2

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
9,823 reviews

Overall

8.0

Entertainment

7.1

Food

7.1

Crew

8.5

Boarding

8.2

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them

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 Avianca, which is currently one of the cheapest options available, starting at $202. American Airlines flights start at $225 while deals on Alaska Airlines start at $233 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

Browse thousands of different options on Cheapflights for your next trip

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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 April 1, 2025.
AirlineCheapestAverageFlexibilityOn-time
AviancaCheapest$314Average$449FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$436Average$704FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$442Average$585FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$616Average$698FlexibilityNo cancel feeOn-time63%

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