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$117+ 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 3/24. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SJO
Feb 25 — Mar 41
Tue 2/25
Tue 3/4
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 February 20, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$254
(CheapOair)

One-way from

$117
(Kiwi.com)

Popular in

December

Cheapest in

September

Average price

$403
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 ($99 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 February 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 February 20, 2025.

This CheapOair deal was found by Cheapflights users on 2/20. 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.
Mon 3/171:09 amONT - SJO
1 stop21h 02mMultiple Airlines
Tue 4/13:31 pmSJO - ONT
1 stop8h 42mMultiple Airlines
Deal found 2/20$254
This Cheapflightsfares deal was found by Cheapflights users on 2/19. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/2911:25 pmONT - SJO
1 stop10h 50mAvianca
Sun 6/83:05 pmSJO - ONT
1 stop7h 50mAvianca
Deal found 2/19$449
This American Airlines deal was found by Cheapflights users on 2/19. 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.
Mon 3/317:35 pmONT - SJO
2 stops14h 30mAmerican Airlines
Tue 4/2211:59 pmSJO - ONT
1 stop10h 55mAmerican Airlines
Deal found 2/19$477
This United Airlines deal was found by Cheapflights users on 2/20. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/256:00 amONT - SJO
1 stop10h 16mUnited Airlines
Mon 3/32:20 pmSJO - ONT
2 stops20h 55mUnited Airlines
Deal found 2/20$492
This United Airlines deal was found by Cheapflights users on 2/19. 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 3/126:00 amONT - LIR
1 stop10h 30mUnited Airlines
Sun 3/168:30 amLIR - ONT
1 stop15h 15mUnited Airlines
Deal found 2/19$607
This Kissandfly.com deal was found by Cheapflights users on 2/20. 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 Kissandfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/86:00 amONT - SJO
1 stop12h 37mLufthansa
Sat 8/98:45 amSJO - ONT
1 stop9h 58mLufthansa
Deal found 2/20$650
This Southwest deal was found by Cheapflights users on 2/19. 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.
Wed 4/29:55 amONT - SJO
1 stop8h 45mSouthwest
Sun 4/61:55 pmSJO - ONT
2 stops18h 45mSouthwest
Deal found 2/19$652
This Alaska Airlines deal was found by Cheapflights users on 2/18. 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.
Sun 3/167:00 amONT - SJO
3 stops15h 50mAlaska Airlines
Tue 5/131:12 amSJO - ONT
2 stops23h 46mAlaska Airlines
Deal found 2/18$660
This American Airlines deal was found by Cheapflights users on 2/19. 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 3/292:54 pmONT - LIR
1 stop21h 05mAmerican Airlines
Sat 4/52:07 pmLIR - ONT
2 stops19h 52mAmerican Airlines
Deal found 2/19$660
This Alaska Airlines deal was found by Cheapflights users on 2/19. 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.
Fri 5/26:24 pmONT - LIR
1 stop20h 32mAlaska Airlines
Sat 5/104:52 pmLIR - ONT
2 stops32h 07mAlaska Airlines
Deal found 2/19$733
This Air Canada deal was found by Cheapflights users on 2/19. 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.
Fri 4/43:55 pmONT - LIR
2 stops20h 15mAir Canada
Fri 4/112:30 pmLIR - ONT
2 stops23h 08mAir Canada
Deal found 2/19$1,200
This Delta deal was found by Cheapflights users on 2/19. 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.
Sat 3/2212:46 pmONT - LIR
1 stop21h 55mDelta
Sat 3/2911:37 amLIR - ONT
1 stop12h 06mDelta
Deal found 2/19$2,414

Find flights from Ontario to Costa Rica within your budget

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 February 20, 2025.

Fly from

Ontario

Fly to

Costa Rica

Route

Depart

Return

Price

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Mon 3/17

1:09 am-11:11 pm

1 stop21h 02m

San José Juan Santamaria Intl

Tue 4/1

3:31 pm-11:13 pm

1 stop8h 42m

$254

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Tue 3/11

11:30 pm-1:35 pm

1 stop13h 05m

San José Juan Santamaria Intl

Thu 3/13

9:35 am-10:00 pm

1 stop13h 25m

$449

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Mon 3/31

7:35 pm-11:05 am

2 stops14h 30m

San José Juan Santamaria Intl

Tue 4/22

11:59 pm-9:54 am

1 stop10h 55m

$477

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Thu 3/13

6:00 am-8:55 pm

1 stop13h 55m

San José Juan Santamaria Intl

Wed 3/26

5:30 am-9:59 pm

1 stop17h 29m

$546

OntarioLiberia

ONT - LIR

ONTLIR

Ontario

Wed 3/12

6:00 am-5:30 pm

1 stop10h 30m

Liberia

Sun 3/16

8:30 am-10:45 pm

1 stop15h 15m

$607

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Fri 8/8

6:00 am-7:37 pm

1 stop12h 37m

San José Juan Santamaria Intl

Sat 8/9

8:45 am-5:43 pm

1 stop9h 58m

$650

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Wed 4/2

9:55 am-7:40 pm

1 stop8h 45m

San José Juan Santamaria Intl

Sun 4/6

1:55 pm-7:40 am

2 stops18h 45m

$652

OntarioLiberia

ONT - LIR

ONTLIR

Ontario

Sat 3/29

2:54 pm-12:59 pm

1 stop21h 05m

Liberia

Sat 4/5

2:07 pm-8:59 am

2 stops19h 52m

$660

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Mon 3/31

6:00 am-12:12 am

2 stops17h 12m

San José Juan Santamaria Intl

Mon 4/21

1:12 am-8:29 pm

2 stops20h 17m

$727

OntarioLiberia

ONT - LIR

ONTLIR

Ontario

Fri 5/2

6:24 pm-3:56 pm

1 stop20h 32m

Liberia

Sat 5/10

4:52 pm-11:59 pm

2 stops32h 07m

$733

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/20

Showing 1-10 of 27 results
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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.

Travel insights for flights from Ontario to Costa Rica

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

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 February 20, 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 February 20, 2025.
Read reviews from past customers who have flown Southwest, Alaska Airlines and Delta from Ontario to Costa Rica. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.1
Very good
4,411 reviews

Entertainment

7.6

Boarding

8.2

Overall

8.1

Comfort

8.1

Food

7.1

Crew

8.7

Reviews

1 / 20

10.0
Excellent

Arlene,May 2024

SAN - OAK

My original flight was delayed so they found this flight for me so I could arrive at a reasonable time

Southwest
8.1
Very good
4,411 reviews
Southwest
8.1
Very good
4,411 reviews

Entertainment

7.6

Boarding

8.2

Overall

8.1

Comfort

8.1

Food

7.1

Crew

8.7

Reviews

1 / 20

10.0
Excellent

Arlene,May 2024

SAN - OAK

My original flight was delayed so they found this flight for me so I could arrive at a reasonable time

Alaska Airlines
8.0
Very good
9,697 reviews
Southwest
8.1
Very good
4,411 reviews

Entertainment

7.6

Boarding

8.2

Overall

8.1

Comfort

8.1

Food

7.1

Crew

8.7

Reviews

1 / 20

10.0
Excellent

Arlene,May 2024

SAN - OAK

My original flight was delayed so they found this flight for me so I could arrive at a reasonable time

Delta
8.0
Very good
8,219 reviews
Southwest
8.1
Very good
4,411 reviews

Entertainment

7.6

Boarding

8.2

Overall

8.1

Comfort

8.1

Food

7.1

Crew

8.7

Reviews

1 / 20

10.0
Excellent

Arlene,May 2024

SAN - OAK

My original flight was delayed so they found this flight for me so I could arrive at a reasonable time

JetBlue
7.4
Good
3,070 reviews
Southwest
8.1
Very good
4,411 reviews

Entertainment

7.6

Boarding

8.2

Overall

8.1

Comfort

8.1

Food

7.1

Crew

8.7

Reviews

1 / 20

10.0
Excellent

Arlene,May 2024

SAN - OAK

My original flight was delayed so they found this flight for me so I could arrive at a reasonable time

United Airlines
7.4
Good
8,765 reviews
Southwest
8.1
Very good
4,411 reviews

Entertainment

7.6

Boarding

8.2

Overall

8.1

Comfort

8.1

Food

7.1

Crew

8.7

Reviews

1 / 20

10.0
Excellent

Arlene,May 2024

SAN - OAK

My original flight was delayed so they found this flight for me so I could arrive at a reasonable time

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 $209. United Airlines flights start at $226 while deals on JetBlue start at $239 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 3 airlines flying from Ontario to Costa Rica

Discover the top 3 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 February 20, 2025.
AirlineCheapestAverageFlexibilityOn-time
AviancaCheapest$314Average$462FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$378Average$728FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$423Average$605FlexibilityNo cancel feeOn-time71%
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