HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Costa Rica

$155+ 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 5/10. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SJO
May 3 — May 101
Sat 5/3
Sat 5/10
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Ontario to Costa Rica with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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 28, 2025.

Most accurate provider

AranGrant
3 stars

Most trusted provider

AranGrant
3 stars

Round-trip from

$316
(CheapOair)

One-way from

$155
(Priceline)

Popular in

December

Cheapest in

September

Average price

$488
Provider with most accurate pricing for Los Angeles-San José Juan Santamaria Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for Los Angeles-San José Juan Santamaria Intl flights.
Search Deals
From Ontario to Costa Rica
Search Deals
One-way flight from Ontario to Costa Rica
Search Deals
Highest demand for flights based on searches. 16% potential increase in price ($93 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($23 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 2025
Search Deals

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 28, 2025.

This CheapOair deal was found by Cheapflights users on 4/27. 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 5/261:09 amONT - SJO
1 stop21h 05mMultiple Airlines
Tue 6/33:31 pmSJO - ONT
1 stop8h 42mMultiple Airlines
Deal found 4/27$316
This Avianca deal was found by Cheapflights users on 4/27. 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 5/2711:25 pmONT - SJO
1 stop10h 50mAvianca
Thu 5/293:05 pmSJO - ONT
1 stop7h 50mAvianca
Deal found 4/27$347
This American Airlines deal was found by Cheapflights users on 4/27. 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.
Fri 5/212:50 pmONT - SJO
1 stop8h 14mAmerican Airlines
Thu 5/81:50 pmSJO - ONT
1 stop9h 08mAmerican Airlines
Deal found 4/27$349
This United Airlines deal was found by Cheapflights users on 4/26. 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 8/296:38 pmONT - SJO
2 stops16h 48mUnited Airlines
Thu 9/48:37 amSJO - ONT
1 stop12h 56mUnited Airlines
Deal found 4/26$366
This American Airlines deal was found by Cheapflights users on 4/26. 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 9/111:59 pmONT - LIR
2 stops12h 06mAmerican Airlines
Wed 9/102:05 pmLIR - ONT
1 stop8h 51mAmerican Airlines
Deal found 4/26$528
This Delta deal was found by Cheapflights users on 4/26. 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 9/110:59 pmONT - LIR
1 stop12h 01mDelta
Wed 9/101:25 pmLIR - ONT
1 stop10h 16mDelta
Deal found 4/26$551
This United Airlines deal was found by Cheapflights users on 4/27. 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 4/27$619
This Mytrip deal was found by Cheapflights users on 4/27. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/1311:25 pmONT - LIR
2 stops15h 15mMultiple Airlines
Fri 5/2312:00 pmLIR - ONT
2 stops34h 55mMultiple Airlines
Deal found 4/27$751
This Alaska Airlines deal was found by Cheapflights users on 4/28. 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 24mAlaska Airlines
Deal found 4/28$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 28, 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 5/26

1:09 am-11:14 pm

1 stop21h 05m

San José Juan Santamaria Intl

Tue 6/3

3:31 pm-11:13 pm

1 stop8h 42m

$316

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Tue 5/27

11:25 pm-11:15 am

1 stop10h 50m

San José Juan Santamaria Intl

Thu 5/29

3:05 pm-9:55 pm

1 stop7h 50m

$347

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Sat 8/30

11:59 pm-8:14 pm

2 stops19h 15m

San José Juan Santamaria Intl

Sat 9/6

11:35 am-8:41 am

2 stops22h 06m

$356

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Fri 8/29

6:38 pm-12:26 pm

2 stops16h 48m

San José Juan Santamaria Intl

Thu 9/4

8:37 am-8:33 pm

1 stop12h 56m

$366

OntarioLiberia

ONT - LIR

ONTLIR

Ontario

Mon 9/1

11:59 pm-1:05 pm

2 stops12h 06m

Liberia

Wed 9/10

2:05 pm-9:56 pm

1 stop8h 51m

$528

OntarioLiberia

ONT - LIR

ONTLIR

Ontario

Mon 9/1

10:59 pm-12:00 pm

1 stop12h 01m

Liberia

Wed 9/10

1:25 pm-10:41 pm

1 stop10h 16m

$551

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

Tue 5/13

11:25 pm-3:40 pm

2 stops15h 15m

Liberia

Fri 5/23

12:00 pm-9:55 pm

2 stops34h 55m

$751

OntarioLiberia

ONT - LIR

ONTLIR

Ontario

Sat 8/16

7:30 am-6:20 am

2 stops21h 50m

Liberia

Sat 8/23

11:20 am-10:44 am

3 stops24h 24m

$981

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Sat 5/10

11:25 pm-11:15 am

1 stop10h 50m

$155

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/28

Showing 1-10 of 21 results
1
2
3

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 28, 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 28, 2025.
Read reviews from past customers who have flown Alaska Airlines, Delta and Copa 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
9,949 reviews

Comfort

7.9

Crew

8.5

Food

7.1

Entertainment

7.1

Overall

8.0

Boarding

8.2

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
9,949 reviews
Alaska Airlines
8.0
Very good
9,949 reviews

Comfort

7.9

Crew

8.5

Food

7.1

Entertainment

7.1

Overall

8.0

Boarding

8.2

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
7,927 reviews
Alaska Airlines
8.0
Very good
9,949 reviews

Comfort

7.9

Crew

8.5

Food

7.1

Entertainment

7.1

Overall

8.0

Boarding

8.2

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
Copa Airlines
7.5
Good
1,410 reviews
Alaska Airlines
8.0
Very good
9,949 reviews

Comfort

7.9

Crew

8.5

Food

7.1

Entertainment

7.1

Overall

8.0

Boarding

8.2

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
8,694 reviews
Alaska Airlines
8.0
Very good
9,949 reviews

Comfort

7.9

Crew

8.5

Food

7.1

Entertainment

7.1

Overall

8.0

Boarding

8.2

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
9,949 reviews

Comfort

7.9

Crew

8.5

Food

7.1

Entertainment

7.1

Overall

8.0

Boarding

8.2

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 $155. American Airlines flights start at $188 while deals on United Airlines start at $203 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

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Ontario to Costa Rica

See prices for flight routes from nearby airports that may be better suited for you.
Los Angeles to San Salvador flights
Los Angeles to Guatemala City flights
Los Angeles to San José flights
San Francisco to San José flights
Los Angeles to Panama City flights
Los Angeles to Liberia flights
Los Angeles to Philip S.W.Goldson flights
Ontario to Guatemala City flights
San Francisco to Panama City flights
Ontario to San José flights
San Francisco to Guatemala City flights
Burbank to Guatemala City flights
Los Angeles to Managua flights
San Francisco to Liberia flights
San Francisco to San Salvador flights
Ontario to San Salvador flights
San Francisco to Managua flights
San Francisco to Philip S.W.Goldson flights
Ontario to Panama City flights
Burbank to San José flights
Oakland to San José flights
Los Angeles to San Pedro Sula flights
Ontario to Liberia flights
Ontario to Philip S.W.Goldson flights
San Diego to San José flights
Las Vegas to San José flights
Burbank to San Salvador flights
San Jose to San José flights
Ontario to Managua flights
Oakland to San Salvador flights
Reno to San José flights
Las Vegas to Panama City flights
Las Vegas to San Salvador flights
San Jose to Guatemala City flights
Santa Ana to Guatemala City flights
Ontario to San Pedro Sula flights
Oakland to Guatemala City flights
San Diego to Panama City flights
Santa Ana to San José flights
San Diego to Philip S.W.Goldson flights
Sacramento to San José flights
Las Vegas to Liberia flights
Burbank to San Pedro Sula flights
Las Vegas to Philip S.W.Goldson flights
Sacramento to Liberia flights
San Francisco to San Pedro Sula flights
San Diego to Liberia flights
San Jose to Panama City flights
Los Angeles to Coxen Hole flights
Sacramento to Philip S.W.Goldson flights

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 28, 2025.
AirlineCheapestAverageFlexibilityOn-time
AviancaCheapest$326Average$480FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$378Average$690FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$419Average$584FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$616Average$698FlexibilityNo cancel feeOn-time63%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.