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$154+ 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 4/30. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SJO
Apr 30 — May 71
Wed 4/30
Wed 5/7
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 25, 2025.

Most accurate provider

AranGrant
3 stars

Most trusted provider

AranGrant
3 stars

Round-trip from

$344
(Avianca)

One-way from

$154
(American Airlines)

Popular in

December

Cheapest in

September

Average price

$487
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. 16% potential increase in price ($91 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 25, 2025.

This Avianca deal was found by Cheapflights users on 4/25. 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 Avianca 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
Thu 5/223:05 pmSJO - ONT
1 stop7h 50mAvianca
Deal found 4/25$344
This American Airlines deal was found by Cheapflights users on 4/25. 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 6/3010:54 amONT - SJO
1 stop10h 10mAmerican Airlines
Wed 8/277:40 amSJO - ONT
1 stop10h 52mAmerican Airlines
Deal found 4/25$352
This CheapOair deal was found by Cheapflights users on 4/25. 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.
Fri 5/91:09 amONT - SJO
1 stop21h 05mMultiple Airlines
Sat 5/173:31 pmSJO - ONT
1 stop8h 42mMultiple Airlines
Deal found 4/25$390
This United Airlines deal was found by Cheapflights users on 4/25. 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.
Fri 8/16:00 amONT - SJO
1 stop12h 37mUnited Airlines
Wed 8/68:45 amSJO - ONT
1 stop9h 58mUnited Airlines
Deal found 4/25$442
This American Airlines deal was found by Cheapflights users on 4/25. 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 8/1611:02 pmONT - LIR
1 stop13h 16mAmerican Airlines
Sat 8/232:10 pmLIR - ONT
1 stop10h 19mAmerican Airlines
Deal found 4/25$537
This Southwest deal was found by Cheapflights users on 4/25. 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 6/284:35 pmONT - LIR
2 stops19h 30mSouthwest
Sat 7/52:05 pmLIR - ONT
2 stops18h 05mSouthwest
Deal found 4/25$543
This Delta deal was found by Cheapflights users on 4/25. 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 11/2410:59 pmONT - LIR
1 stop11h 44mDelta
Wed 11/262:10 pmLIR - ONT
1 stop10h 31mDelta
Deal found 4/25$551
This United Airlines deal was found by Cheapflights users on 4/25. 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 5/266:00 amONT - LIR
1 stop7h 23mUnited Airlines
Mon 6/211:05 amLIR - ONT
1 stop11h 05mUnited Airlines
Deal found 4/25$619
This Alaska Airlines deal was found by Cheapflights users on 4/25. 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 8/167:30 amONT - LIR
2 stops21h 50mAlaska Airlines
Sat 8/2311:20 amLIR - ONT
3 stops24h 25mAlaska Airlines
Deal found 4/25$981

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 25, 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

Tue 5/13

11:25 pm-11:15 am

1 stop10h 50m

San José Juan Santamaria Intl

Thu 5/22

3:05 pm-9:55 pm

1 stop7h 50m

$344

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Mon 6/30

10:54 am-10:04 pm

1 stop10h 10m

San José Juan Santamaria Intl

Wed 8/27

7:40 am-5:32 pm

1 stop10h 52m

$352

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Fri 5/9

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

$390

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Fri 8/1

6:00 am-7:37 pm

1 stop12h 37m

San José Juan Santamaria Intl

Wed 8/6

8:45 am-5:43 pm

1 stop9h 58m

$442

OntarioLiberia

ONT - LIR

ONTLIR

Ontario

Sat 8/16

11:02 pm-1:18 pm

1 stop13h 16m

Liberia

Sat 8/23

2:10 pm-11:29 pm

1 stop10h 19m

$537

OntarioLiberia

ONT - LIR

ONTLIR

Ontario

Sat 6/28

4:35 pm-1:05 pm

2 stops19h 30m

Liberia

Sat 7/5

2:05 pm-7:10 am

2 stops18h 05m

$543

OntarioLiberia

ONT - LIR

ONTLIR

Ontario

Mon 5/26

6:00 am-2:23 pm

1 stop7h 23m

Liberia

Mon 6/2

11:05 am-9:10 pm

1 stop11h 05m

$619

OntarioLiberia

ONT - LIR

ONTLIR

Ontario

Sat 8/16

7:30 am-6:20 am

2 stops21h 50m

Liberia

Sat 8/23

11:20 am-10:45 am

3 stops24h 25m

$981

OntarioLiberia

ONT - LIR

ONTLIR

Ontario

Mon 9/29

10:59 pm-12:00 pm

1 stop12h 01m

Liberia

Sun 10/5

1:25 pm-10:41 pm

1 stop10h 16m

$1,206

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Wed 4/30

6:00 am-6:24 pm

2 stops11h 24m

$154

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/25

Showing 1-10 of 22 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.

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 25, 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 25, 2025.
Read reviews from past customers who have flown Alaska Airlines, Southwest and Delta 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
9,927 reviews

Comfort

7.9

Boarding

8.2

Crew

8.5

Overall

8.0

Entertainment

7.1

Food

7.1

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
9,927 reviews
Alaska Airlines
8.0
Very good
9,927 reviews

Comfort

7.9

Boarding

8.2

Crew

8.5

Overall

8.0

Entertainment

7.1

Food

7.1

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
Southwest
8.0
Very good
4,289 reviews
Alaska Airlines
8.0
Very good
9,927 reviews

Comfort

7.9

Boarding

8.2

Crew

8.5

Overall

8.0

Entertainment

7.1

Food

7.1

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
7,920 reviews
Alaska Airlines
8.0
Very good
9,927 reviews

Comfort

7.9

Boarding

8.2

Crew

8.5

Overall

8.0

Entertainment

7.1

Food

7.1

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
8,685 reviews
Alaska Airlines
8.0
Very good
9,927 reviews

Comfort

7.9

Boarding

8.2

Crew

8.5

Overall

8.0

Entertainment

7.1

Food

7.1

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
2,922 reviews
Alaska Airlines
8.0
Very good
9,927 reviews

Comfort

7.9

Boarding

8.2

Crew

8.5

Overall

8.0

Entertainment

7.1

Food

7.1

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 American Airlines, which is currently one of the cheapest options available, starting at $154. Avianca flights start at $157 while deals on United Airlines start at $209 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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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 25, 2025.
AirlineCheapestAverageFlexibilityOn-time
AviancaCheapest$326Average$473FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$378Average$689FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$419Average$579FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$616Average$698FlexibilityNo cancel feeOn-time63%

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