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Costa Rica

$141+ Cheap flights from Illinois 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 8/18. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SJO
Jul 5 — Jul 121
Sat 7/5
Sat 7/12
1 adult, Economy
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Cheap flight deals from Illinois to Costa Rica

Keep the following information in mind while searching for Illinois to Costa Rica flight deals. Data was last updated June 30, 2025.

Round-trip from

$286
(United Airlines)

One-way from

$141
(FlightHub)

Popular in

December

Cheapest in

July

Average price

$557

Good round-trip deal

$511 or less

Good one-way deal

$207 or less
From Illinois to Costa Rica
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One-way flight from Illinois to Costa Rica
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Highest demand for flights based on searches. 9% potential increase in price ($61 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($13 potential savings vs. average RT price).
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Average for round-trip flights in June 2025
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Price to beat on a round-trip flight from Illinois to Costa Rica.
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Price to beat on a one-way flight from Illinois to Costa Rica.
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Find flight deals from Illinois to Costa Rica

Cheapest flights from Illinois to Costa Rica
Explore the most affordable flight options available from Illinois to Costa Rica. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 30, 2025.

This United Airlines deal was found by Cheapflights users on 6/29. 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 9/156:15 amSTL - SJO
1 stop7h 11mUnited Airlines
Tue 9/237:55 amSJO - STL
1 stop10h 03mUnited Airlines
Deal found 6/29$286
This American Airlines deal was found by Cheapflights users on 6/29. 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 9/155:28 amSTL - SJO
1 stop15h 14mAmerican Airlines
Tue 9/237:27 amSJO - STL
2 stops13h 26mAmerican Airlines
Deal found 6/29$290
This Cheapflightsfares deal was found by Cheapflights users on 6/29. 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.
Tue 7/295:05 amORD - SJO
1 stop7h 06mSpirit Airlines
Tue 8/512:16 pmSJO - ORD
1 stop9h 57mSpirit Airlines
Deal found 6/29$291
This American Airlines deal was found by Cheapflights users on 6/28. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/113:53 pmSTL - LIR
2 stops20h 52mAmerican Airlines
Fri 8/1512:45 pmLIR - STL
2 stops19h 15mAmerican Airlines
Deal found 6/28$299
This American Airlines deal was found by Cheapflights users on 6/30. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/112:50 pmORD - SJO
Nonstop5h 12mAmerican Airlines
Fri 11/147:00 amSJO - ORD
Nonstop5h 38mAmerican Airlines
Deal found 6/30$307
This Copa Airlines deal was found by Cheapflights users on 6/30. 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 Copa Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/93:07 pmORD - SJO
1 stop18h 13mCopa Airlines
Tue 10/144:10 amSJO - ORD
1 stop8h 32mCopa Airlines
Deal found 6/30$310
This United Airlines deal was found by Cheapflights users on 6/29. 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 9/176:15 amSTL - LIR
1 stop6h 55mUnited Airlines
Tue 9/301:20 pmLIR - STL
1 stop7h 39mUnited Airlines
Deal found 6/29$314
This Delta deal was found by Cheapflights users on 6/29. 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.
Wed 9/106:00 amSTL - LIR
1 stop7h 00mDelta
Mon 9/151:25 pmLIR - STL
1 stop8h 59mDelta
Deal found 6/29$315
This Southwest deal was found by Cheapflights users on 6/28. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/109:10 amMDW - SJO
1 stop10h 45mSouthwest
Tue 9/301:40 pmSJO - MDW
1 stop8h 40mSouthwest
Deal found 6/28$322
This CheapOair deal was found by Cheapflights users on 6/30. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/135:05 amORD - SJO
1 stop7h 07mMultiple Airlines
Sat 8/304:48 pmSJO - ORD
1 stop11h 54mMultiple Airlines
Deal found 6/30$325
This Delta deal was found by Cheapflights users on 6/28. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/256:00 amSTL - SJO
1 stop7h 10mDelta
Sun 9/71:35 pmSJO - STL
1 stop7h 27mDelta
Deal found 6/28$333
This Southwest deal was found by Cheapflights users on 6/29. 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.
Sun 11/25:00 amSTL - SJO
1 stop8h 15mSouthwest
Fri 11/72:10 pmSJO - STL
2 stops10h 10mSouthwest
Deal found 6/29$341

Cheapflights Fare Finder

Customize your flight search to find flights from Illinois 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 June 30, 2025.
Use the filters below to find and compare flights from Illinois to Costa Rica that are best for you.

Fly from

Illinois

Fly to

Costa Rica

Route

Depart

Return

Price

St. LouisSan José

STL - SJO

STLSJO

Lambert-St Louis

Mon 9/15

6:15 am-12:26 pm

1 stop7h 11m

San José Juan Santamaria Intl

Tue 9/23

7:55 am-6:58 pm

1 stop10h 03m

$286

St. LouisSan José

STL - SJO

STLSJO

Lambert-St Louis

Mon 9/15

5:28 am-7:42 pm

1 stop15h 14m

San José Juan Santamaria Intl

Tue 9/23

7:27 am-9:53 pm

2 stops13h 26m

$290

ChicagoSan José

ORD - SJO

ORDSJO

Chicago O'Hare Intl

Tue 7/29

5:05 am-11:11 am

1 stop7h 06m

San José Juan Santamaria Intl

Tue 8/5

12:16 pm-11:13 pm

1 stop9h 57m

$291

St. LouisLiberia

STL - LIR

STLLIR

Lambert-St Louis

Mon 8/11

3:53 pm-11:45 am

2 stops20h 52m

Liberia

Fri 8/15

12:45 pm-9:00 am

2 stops19h 15m

$299

St. LouisLiberia

STL - LIR

STLLIR

Lambert-St Louis

Wed 9/17

6:15 am-12:10 pm

1 stop6h 55m

Liberia

Tue 9/30

1:20 pm-9:59 pm

1 stop7h 39m

$314

St. LouisLiberia

STL - LIR

STLLIR

Lambert-St Louis

Wed 9/10

6:00 am-12:00 pm

1 stop7h 00m

Liberia

Mon 9/15

1:25 pm-11:24 pm

1 stop8h 59m

$315

ChicagoSan José

MDW - SJO

MDWSJO

Chicago Midway

Wed 9/10

9:10 am-6:55 pm

1 stop10h 45m

San José Juan Santamaria Intl

Tue 9/30

1:40 pm-11:20 pm

1 stop8h 40m

$322

ChicagoSan José

ORD - SJO

ORDSJO

Chicago O'Hare Intl

Mon 9/15

6:00 am-12:45 pm

1 stop7h 45m

San José Juan Santamaria Intl

Wed 9/24

8:50 am-5:55 pm

1 stop8h 05m

$322

ChicagoSan José

ORD - SJO

ORDSJO

Chicago O'Hare Intl

Wed 8/13

5:05 am-11:12 am

1 stop7h 07m

San José Juan Santamaria Intl

Sat 8/30

4:48 pm-5:42 am

1 stop11h 54m

$325

ChicagoSan José

ORD - SJO

ORDSJO

Chicago O'Hare Intl

Wed 9/3

8:10 am-5:57 pm

2 stops10h 47m

San José Juan Santamaria Intl

Mon 9/8

7:21 am-8:56 pm

1 stop12h 35m

$326

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/29

Showing 1-10 of 56 results
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Best time to book a flight from Illinois to Costa Rica

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

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

Currently, September is the cheapest month in which you can book a flight from Illinois to Costa Rica (average of $398). Flying from Illinois 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 IL to CR?

Find hourly flight availability from Illinois 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 June 30, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Illinois to Costa Rica as you normally would.

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 June 30, 2025.
Get a feel of what it's like to fly with Alaska Airlines, Southwest, and Delta from Illinois to Costa Rica by reading reviews from past customers. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Food

7.1

Comfort

7.8

Entertainment

7.1

Boarding

8.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Surinder,May 2025

SEA - YYZ

My wife wanted the aile seat and I always prefer window seat. Luckily we both got the best seats we wanted. The plane was very nice and we enjoyed the best take off and the smooth landing at Toronto. All the services by the staff inside the aeroplane were very nice well appreciated. Thanks again and hope to see you soon.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Food

7.1

Comfort

7.8

Entertainment

7.1

Boarding

8.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Surinder,May 2025

SEA - YYZ

My wife wanted the aile seat and I always prefer window seat. Luckily we both got the best seats we wanted. The plane was very nice and we enjoyed the best take off and the smooth landing at Toronto. All the services by the staff inside the aeroplane were very nice well appreciated. Thanks again and hope to see you soon.
Southwest
8.0
Very good
4,278 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Food

7.1

Comfort

7.8

Entertainment

7.1

Boarding

8.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Surinder,May 2025

SEA - YYZ

My wife wanted the aile seat and I always prefer window seat. Luckily we both got the best seats we wanted. The plane was very nice and we enjoyed the best take off and the smooth landing at Toronto. All the services by the staff inside the aeroplane were very nice well appreciated. Thanks again and hope to see you soon.
Delta
8.0
Very good
7,969 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Food

7.1

Comfort

7.8

Entertainment

7.1

Boarding

8.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Surinder,May 2025

SEA - YYZ

My wife wanted the aile seat and I always prefer window seat. Luckily we both got the best seats we wanted. The plane was very nice and we enjoyed the best take off and the smooth landing at Toronto. All the services by the staff inside the aeroplane were very nice well appreciated. Thanks again and hope to see you soon.
Copa Airlines
7.5
Good
1,465 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Food

7.1

Comfort

7.8

Entertainment

7.1

Boarding

8.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Surinder,May 2025

SEA - YYZ

My wife wanted the aile seat and I always prefer window seat. Luckily we both got the best seats we wanted. The plane was very nice and we enjoyed the best take off and the smooth landing at Toronto. All the services by the staff inside the aeroplane were very nice well appreciated. Thanks again and hope to see you soon.
United Airlines
7.4
Good
8,852 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Food

7.1

Comfort

7.8

Entertainment

7.1

Boarding

8.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Surinder,May 2025

SEA - YYZ

My wife wanted the aile seat and I always prefer window seat. Luckily we both got the best seats we wanted. The plane was very nice and we enjoyed the best take off and the smooth landing at Toronto. All the services by the staff inside the aeroplane were very nice well appreciated. Thanks again and hope to see you soon.

Related info for your journey

Find useful and relevant information for your journey from Illinois 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 are the cheapest airlines to fly from Illinois to Costa Rica one-way?

    For one-way options, check prices for Spirit Airlines. According to our data, you can fly for as low as $141. Users have also found prices from $145 and $154 on Southwest and American Airlines, respectively.

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

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

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

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

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

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

    Currently, September is the cheapest month in which you can book a flight from Illinois to Costa Rica (average of $398). Flying from Illinois 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 Illinois to Costa Rica

See prices for flight routes from nearby airports that may be better suited for you.
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Top 8 airlines flying from Illinois to Costa Rica

Discover the top 8 airlines that operate flights from Illinois 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 June 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$274Average$449FlexibilityNo cancel feeOn-time65%
AviancaCheapest$317Average$459FlexibilityNo cancel feeOn-time71%
JetBlueCheapest$345Average$635FlexibilityNo cancel feeOn-time62%
Copa AirlinesCheapest$367Average$608FlexibilityNo cancel feeOn-time70%
DeltaCheapest$408Average$724FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$444Average$723FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$477Average$661FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$480Average$808FlexibilityNo cancel feeOn-time69%

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