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Ontario

$269+ Cheap flights from Costa Rica to Ontario (ONT)

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 8/26. Fares are subject to change and may not be available on all flights or dates of travel.
SJO — ONT
Jul 22 — Jul 291
Wed 7/22
Wed 7/29
1 adult, Economy
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Cheap flight deals from Costa Rica to Ontario

Cheapest flights from Costa Rica to Ontario
Explore the most affordable flight options available from Costa Rica to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 22, 2026.

This Southwest deal was found by Cheapflights users on 6/20. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/21:40 pm
SJO
-
ONT
1 stop9h 25m
Southwest
Sat 9/126:55 am
ONT
-
SJO
2 stops10h 05m
Southwest
Deal found 6/20$483
This Southwest deal was found by Cheapflights users on 6/17. 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.
Tue 9/11:40 pm
SJO
-
ONT
1 stop9h 25m
Southwest
Tue 9/155:45 am
ONT
-
SJO
2 stops11h 55m
Southwest
Deal found 6/17$511
This United Airlines deal was found by Cheapflights users on 6/17. 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.
Thu 10/2911:50 am
LIR
-
ONT
1 stop9h 30m
United Airlines
Tue 11/105:00 am
ONT
-
LIR
1 stop9h 08m
United Airlines
Deal found 6/17$576
This United Airlines deal was found by Cheapflights users on 6/21. 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 11/62:20 pm
LIR
-
ONT
2 stops23h 41m
United Airlines
Tue 11/109:00 am
ONT
-
LIR
2 stops29h 10m
United Airlines
Deal found 6/21$589
This Mytrip deal was found by Cheapflights users on 6/20. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/207:00 am
SJO
-
ONT
2 stops17h 05m
Multiple Airlines
Fri 8/289:36 pm
ONT
-
SJO
2 stops23h 20m
Multiple Airlines
Deal found 6/20$601
This Mytrip deal was found by Cheapflights users on 6/21. 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.
Fri 8/217:00 am
SJO
-
ONT
2 stops13h 46m
Multiple Airlines
Mon 8/249:36 pm
ONT
-
SJO
2 stops23h 20m
Multiple Airlines
Deal found 6/21$605
This Mytrip deal was found by Cheapflights users on 6/21. 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 8/187:00 am
SJO
-
ONT
2 stops13h 46m
Multiple Airlines
Wed 8/269:36 pm
ONT
-
SJO
2 stops23h 20m
Multiple Airlines
Deal found 6/21$609
This United Airlines deal was found by Cheapflights users on 6/19. 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.
Sun 9/271:20 pm
LIR
-
ONT
2 stops32h 11m
United Airlines
Fri 10/27:00 am
ONT
-
LIR
1 stop27h 53m
United Airlines
Deal found 6/19$618
This Frontier deal was found by Cheapflights users on 6/19. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/189:45 am
SJO
-
ONT
2 stops23h 52m
Frontier
Sat 7/259:32 am
ONT
-
SJO
2 stops21h 48m
Frontier
Deal found 6/19$626
This Avianca deal was found by Cheapflights users on 6/18. 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 Avianca is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/129:35 am
SJO
-
ONT
1 stop13h 20m
Avianca
Sat 2/2010:30 pm
ONT
-
SJO
1 stop18h 25m
Avianca
Deal found 6/18$638
This United Airlines deal was found by Cheapflights users on 6/22. 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 10/21:20 pm
LIR
-
ONT
1 stop9h 39m
United Airlines
Fri 10/91:52 pm
ONT
-
LIR
2 stops21h 18m
United Airlines
Deal found 6/22$644
This Mytrip deal was found by Cheapflights users on 6/22. 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 8/187:00 am
SJO
-
ONT
2 stops13h 46m
Multiple Airlines
Tue 8/1812:55 am
ONT
-
SJO
3 stops20h 05m
Multiple Airlines
Deal found 6/22$647

Find flight deals from Costa Rica to Ontario

Keep the following information in mind while searching for Costa Rica to Ontario flight deals. Data was last updated June 22, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$483
(Southwest)

One-way from

$269
(Southwest)

Popular in

June

Cheapest in

February

Average price

$566
Provider with most accurate pricing for San José Juan Santamaria Intl-Los Angeles flight deals.
Search Deals
Provider most trusted by Cheapflights users for San José Juan Santamaria Intl-Los Angeles flights.
Search Deals
From Costa Rica to Ontario
Search Deals
One-way flight from Costa Rica to Ontario
Search Deals
Highest demand for flights based on searches. 13% potential increase in price ($69 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($12 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in June 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Costa Rica to Ontario 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 June 22, 2026.
Use the filters below to find and compare flights from Costa Rica to Ontario that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip
Quickest round-trip

San JoséOntario

SJO - ONT

SJOONT

San José Juan Santamaria Intl

Tue 9/1

9:00 am-8:55 pm

2 stops12h 55m

Ontario

Tue 9/15

5:45 am-6:40 pm

2 stops11h 55m

$543

LiberiaOntario

LIR - ONT

LIRONT

Liberia

Thu 10/29

11:50 am-8:20 pm

1 stop9h 30m

Ontario

Tue 11/10

6:53 pm-1:10 pm

2 stops16h 17m

$576

LiberiaOntario

LIR - ONT

LIRONT

Liberia

Fri 9/11

1:20 pm-6:11 pm

2 stops29h 51m

Ontario

Wed 9/16

9:01 am-12:10 pm

2 stops26h 09m

$576

LiberiaOntario

LIR - ONT

LIRONT

Liberia

Fri 11/6

2:20 pm-12:01 pm

2 stops23h 41m

Ontario

Tue 11/10

9:00 am-4:10 pm

2 stops29h 10m

$589

LiberiaOntario

LIR - ONT

LIRONT

Liberia

Fri 10/2

1:20 pm-9:59 pm

1 stop9h 39m

Ontario

Fri 10/9

1:52 pm-12:10 pm

2 stops21h 18m

$644

San JoséOntario

SJO - ONT

SJOONT

San José Juan Santamaria Intl

Sun 8/30

8:45 am-12:12 pm

1 stop28h 27m

Ontario

Fri 9/4

9:01 am-7:15 am

1 stop21h 14m

$651

San JoséOntario

SJO - ONT

SJOONT

San José Juan Santamaria Intl

Wed 7/15

12:30 am-10:37 pm

2 stops23h 07m

Ontario

Mon 7/20

6:00 am-7:15 am

1 stop24h 15m

$651

San JoséOntario

SJO - ONT

SJOONT

San José Juan Santamaria Intl

Fri 6/26

7:55 am-9:55 pm

1 stop15h 00m

Ontario

Tue 6/30

6:00 am-7:15 am

1 stop24h 15m

$651

San JoséOntario

SJO - ONT

SJOONT

San José Juan Santamaria Intl

Sun 7/19

6:40 am-5:54 pm

2 stops36h 14m

Ontario

Sun 7/26

1:18 pm-10:11 am

2 stops19h 53m

$651

San JoséOntario

SJO - ONT

SJOONT

San José Juan Santamaria Intl

Tue 6/30

12:30 am-12:12 pm

2 stops12h 42m

Ontario

Sun 7/5

6:00 am-7:15 am

1 stop24h 15m

$651

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/20

Showing 1-10 of 36 resultsSorted by cheapest first
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Best time to book a flight from Costa Rica to Ontario

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

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

Currently, August is the cheapest month in which you can book a flight from Costa Rica to Ontario (average of $264). Flying from Costa Rica to Ontario in July is currently the most expensive (average of $324). 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.

How far ahead should I book a flight from Costa Rica to Ontario?

To ensure you get the cheapest price possible for a flight from Costa Rica to Ontario, you should look to book at least 8 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

Reviews of airlines servicing Ontario

Get insights into the airlines that provide service to Ontario. 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 Ontario. Reviews last updated June 22, 2026.
Read through reviews of airlines operating flights from Costa Rica to Ontario, such as United Airlines and Avianca. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
9,874 reviews

Entertainment

7.1

Boarding

7.7

Comfort

7.3

Overall

7.4

Food

6.6

Crew

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

FRA - SFO

Lufthansa was amazing, I wish United States based airlines operated like them.
United Airlines
7.4
Good
9,874 reviews
United Airlines
7.4
Good
9,874 reviews

Entertainment

7.1

Boarding

7.7

Comfort

7.3

Overall

7.4

Food

6.6

Crew

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

FRA - SFO

Lufthansa was amazing, I wish United States based airlines operated like them.
Avianca
6.5
Okay
2,533 reviews
United Airlines
7.4
Good
9,874 reviews

Entertainment

7.1

Boarding

7.7

Comfort

7.3

Overall

7.4

Food

6.6

Crew

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

FRA - SFO

Lufthansa was amazing, I wish United States based airlines operated like them.

Related info for your journey

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

    Located just 3.1 mi from the city center, Ontario (ONT) is the airport most travelers will use when flying to Ontario from Costa Rica.

  • How long is the flight from Costa Rica to Ontario?

    Departing from Costa Rica to Ontario will take you 9h 30m. Costa Rica and Ontario are separated by a distance of 2590 mi. Both multi-stop and nonstop flights can be found to your destination and back.

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

    The cheapest airline one-way is United Airlines, with whom users have recently found tickets for as low as $161. However, be on the lookout for offers from American Airlines and Avianca, as they are both options that can get you from Costa Rica to Ontario for a low price.

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

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

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

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

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

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

    Currently, August is the cheapest month in which you can book a flight from Costa Rica to Ontario (average of $264). Flying from Costa Rica to Ontario in July is currently the most expensive (average of $324). 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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Top 2 airlines flying from Costa Rica to Ontario

Discover the top 2 airlines that operate flights from Costa Rica to Ontario. 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 June 22, 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$267Average$388FlexibilityNo cancel feeOn-time69%
AviancaCheapest$361Average$430FlexibilityNo cancel feeOn-time71%

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