Latest deals
Insights
FAQs
Reviews
Price Alerts

Cheap flights from Illinois to Costa Rica from $103

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Illinois to Costa Rica departing on 1/14. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

Discover deals from 900+ travel sites with momondo.

Save money when you book flights with momondo

Big names and deals

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

Find the cheapest flights from Illinois to Costa Rica

Cheap round-trip flights

Enter your travel dates to find the best prices.
United Airlines Logo
6:30 am - 6:37 pm
STL
-
LIR
12h 07m2 stops
United Airlines Logo
7:35 am - 10:16 pm
LIR
-
STL
13h 41m1 stop
$307United Airlines
Tue, Mar 3 - Tue, Mar 10
American Airlines Logo
6:57 pm - 1:19 pm
STL
-
LIR
19h 22m2 stops
American Airlines Logo
12:21 pm - 8:35 am
LIR
-
STL
19h 14m2 stops
$311American Airlines
Sun, Mar 8 - Thu, Mar 12
Multiple Airlines Logo
11:42 am - 11:40 am
ORD
-
SJO
23h 58m2 stops
Multiple Airlines Logo
1:31 pm - 12:18 am
SJO
-
ORD
10h 47m1 stop
$314Multiple Airlines
Thu, Feb 19 - Mon, Mar 2
Multiple Airlines Logo
6:00 pm - 1:42 pm
ORD
-
SJO
19h 42m1 stop
Multiple Airlines Logo
1:31 pm - 12:18 am
SJO
-
ORD
10h 47m1 stop
$315Multiple Airlines
Fri, Feb 20 - Mon, Mar 2
Spirit Airlines Logo
10:48 am - 11:37 am
ORD
-
SJO
24h 49m1 stop
Spirit Airlines Logo
1:31 pm - 12:18 am
SJO
-
ORD
10h 47m1 stop
$316Spirit Airlines
Tue, Feb 10 - Thu, Feb 19
Spirit Airlines Logo
5:00 am - 12:25 pm
ORD
-
SJO
7h 25m1 stop
Spirit Airlines Logo
1:30 pm - 2:17 pm
SJO
-
ORD
24h 47m2 stops
$318Spirit Airlines
Mon, Jan 5 - Thu, Jan 22
Air Canada Logo
4:05 pm - 2:45 pm
STL
-
LIR
22h 40m1 stop
Air Canada Logo
3:45 pm - 3:29 pm
LIR
-
STL
23h 44m1 stop
$329Air Canada
Fri, Jan 16 - Fri, Jan 23
Delta Logo
6:00 am - 12:50 pm
STL
-
LIR
6h 50m1 stop
Delta Logo
2:05 pm - 11:39 pm
LIR
-
STL
9h 34m1 stop
$331Delta
Tue, Jan 6 - Tue, Jan 13
Delta Logo
5:51 am - 12:50 pm
MLI
-
LIR
6h 59m1 stop
Delta Logo
2:05 pm - 10:33 pm
LIR
-
MLI
8h 28m1 stop
$405Delta
Mon, Jan 19 - Thu, Jan 22
Air Canada Logo
8:40 pm - 1:45 pm
ORD
-
LIR
18h 05m1 stop
Air Canada Logo
3:15 pm - 8:03 am
LIR
-
ORD
15h 48m1 stop
$407Air Canada
Sun, Mar 22 - Mon, Mar 30

Spirit Airlines flights from Illinois to Costa Rica

Our best Spirit Airlines deals on Illinois to Costa Rica flight tickets
Spirit Airlines
Feb 10
ORD10:48 amChicago O'Hare Intl
24h 49m
1 stop
SJO11:37 amSan José Juan Santamaria Intl
Feb 19
SJO1:31 pmSan José Juan Santamaria Intl
10h 47m
1 stop
ORD12:18 amChicago O'Hare Intl
$316
Find similar
Spirit Airlines
Jan 5
ORD5:00 amChicago O'Hare Intl
7h 25m
1 stop
SJO12:25 pmSan José Juan Santamaria Intl
Jan 22
SJO1:30 pmSan José Juan Santamaria Intl
24h 47m
2 stops
ORD2:17 pmChicago O'Hare Intl
$318
Find similar
Spirit Airlines
Feb 9
ORD3:22 pmChicago O'Hare Intl
20h 15m
2 stops
SJO11:37 amSan José Juan Santamaria Intl
Feb 19
SJO12:35 pmSan José Juan Santamaria Intl
11h 43m
2 stops
ORD12:18 amChicago O'Hare Intl
$319
Find similar

Avianca flights from Illinois to Costa Rica

Our best Avianca deals on Illinois to Costa Rica flight tickets
Avianca
Jan 14
ORD2:35 pmChicago O'Hare Intl
7h 15m
1 stop
SJO9:50 pmSan José Juan Santamaria Intl
Jan 21
SJO5:45 amSan José Juan Santamaria Intl
7h 30m
1 stop
ORD1:15 pmChicago O'Hare Intl
$326
Find similar
Avianca
Jan 20
ORD4:10 pmChicago O'Hare Intl
7h 30m
1 stop
SJO11:40 pmSan José Juan Santamaria Intl
Jan 31
SJO5:00 amSan José Juan Santamaria Intl
9h 50m
1 stop
ORD2:50 pmChicago O'Hare Intl
$346
Find similar

momondo 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, momondo users made 832,500 searches. Data last updated December 4, 2025.
Use the filters below to find and compare flights from Illinois to Costa Rica that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisLiberia

STL - LIR

STLLIR

Lambert-St Louis

Tue 3/3

6:30 am-6:37 pm

2 stops12h 07m

Liberia

Tue 3/10

7:35 am-10:16 pm

1 stop13h 41m

$307

St. LouisLiberia

STL - LIR

STLLIR

Lambert-St Louis

Sun 3/8

6:57 pm-1:19 pm

2 stops19h 22m

Liberia

Thu 3/12

12:21 pm-8:35 am

2 stops19h 14m

$311

ChicagoSan José

ORD - SJO

ORDSJO

Chicago O'Hare Intl

Thu 2/19

11:42 am-11:40 am

2 stops23h 58m

San José Juan Santamaria Intl

Mon 3/2

1:31 pm-12:18 am

1 stop10h 47m

$314

ChicagoSan José

ORD - SJO

ORDSJO

Chicago O'Hare Intl

Fri 2/20

6:00 pm-1:42 pm

1 stop19h 42m

San José Juan Santamaria Intl

Mon 3/2

1:31 pm-12:18 am

1 stop10h 47m

$315

ChicagoSan José

ORD - SJO

ORDSJO

Chicago O'Hare Intl

Tue 2/10

10:48 am-11:37 am

1 stop24h 49m

San José Juan Santamaria Intl

Thu 2/19

1:31 pm-12:18 am

1 stop10h 47m

$316

ChicagoSan José

ORD - SJO

ORDSJO

Chicago O'Hare Intl

Mon 1/5

5:00 am-12:25 pm

1 stop7h 25m

San José Juan Santamaria Intl

Thu 1/22

1:30 pm-2:17 pm

2 stops24h 47m

$318

St. LouisLiberia

STL - LIR

STLLIR

Lambert-St Louis

Fri 1/16

4:05 pm-2:45 pm

1 stop22h 40m

Liberia

Fri 1/23

3:45 pm-3:29 pm

1 stop23h 44m

$329

St. LouisLiberia

STL - LIR

STLLIR

Lambert-St Louis

Tue 1/6

6:00 am-12:50 pm

1 stop6h 50m

Liberia

Tue 1/13

2:05 pm-11:39 pm

1 stop9h 34m

$331

MolineLiberia

MLI - LIR

MLILIR

Moline Quad-City

Mon 1/19

5:51 am-12:50 pm

1 stop6h 59m

Liberia

Thu 1/22

2:05 pm-10:33 pm

1 stop8h 28m

$405

ChicagoLiberia

ORD - LIR

ORDLIR

Chicago O'Hare Intl

Sun 3/22

8:40 pm-1:45 pm

1 stop18h 05m

Liberia

Mon 3/30

3:15 pm-8:03 am

1 stop15h 48m

$407

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

See travel insights to Costa Rica from

How to get the cheapest flight ticket from Illinois to Costa Rica

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to Costa Rica?

The cheapest month to fly to Costa Rica from Illinois is in September. Flight prices, which tend to average around $314, are often lower during this time because this is during the off-season. If you’re not able to fly to Costa Rica in September, then October is your next best option. Flight prices from Illinois to Costa Rica during October average around $379.

What is the cheapest day to depart on your flight to Costa Rica?

According to our data, Tuesday is the cheapest day to fly to Costa Rica from Illinois. The lowest ticket price found for a Tuesday departure recently was $542. Keep in mind that prices can always vary depending on your route and whether or not you are flying domestic or international. If your travel schedule is flexible, try to avoid departing on a Saturday because tickets tend to average around $746. These prices are subject to change though, so be sure to set up a Price Alert for flights to Costa Rica.

What is the cheapest time of day to depart on your flight to Costa Rica?

In the evening is the cheapest time of day to fly from Illinois to Costa Rica when you can find flight prices for as low as $436. Flying to Costa Rica in the evening is an ideal time because this is during off-peak travel hours. Flights to Costa Rica are more costly in the morning, with an average ticket price of $699. Departure times in the morning fall within the peak daily travel times, which is why tickets can be more expensive.

What is the cheapest Illinois to Costa Rica flight route?

Fly from Chicago O'Hare Intl to San José Juan Santamaria Intl for the best Illinois - Costa Rica flight prices

How far in advance should I book a flight to Costa Rica?

You are more likely to see cheaper flights to Costa Rica from Illinois when booking weeks ahead of your departure date. In general, you can expect to find flights to Costa Rica for around $541 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Costa Rica from Illinois for as low as $437 on momondo.

What cabin class options are available on Illinois to Costa Rica flights?

There are 3 cabin classes available to choose from on Illinois to Costa Rica flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on Illinois to Costa Rica flights?

You could potentially save up to 8% on your flight if you consider stops on a Illinois to Costa Rica flight.

Cheap Illinois to Costa Rica flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Illinois to Costa Rica

Best Price Found

$176

Fastest flight time

5h 00m

Direct flights

Every day

Airports in Costa Rica

2 airports
The best one-way flight to Costa Rica from Illinois in the past 72 hours is $176. The best round-trip flight deal from Illinois to Costa Rica found on momondo in the last 72 hours is $463.
The fastest flight from Illinois to Costa Rica takes 5h 00m
Direct flights go from Illinois to Costa Rica every day.
There are 2 airports near Costa Rica: Liberia (LIR), San José Juan Santamaria Intl (SJO)
Search flight deals

  • When did momondo last update prices for flights from Illinois to Costa Rica?

    Prices for flights from Illinois to Costa Rica are refreshed on a daily basis.

  • How many operators does momondo search for flights from Illinois to Costa Rica?

  • How old do you have to be to fly from Illinois to Costa Rica?

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Illinois to Costa Rica.

  • What documentation or ID do you need to fly to Costa Rica?

    The travel and health documents you'll need for your trip to Costa Rica may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Costa Rica. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

  • What is the most popular plane model from Illinois to Costa Rica?

Best airlines flying from Illinois to Costa Rica

Compare and see reviews for airlines that fly from Illinois to Costa Rica with momondo
Airline
Rating
Free Cancellation
Price
DeltaPriceFrom $221Free CancellationRating
7.9
8,011 reviews
Search Delta flights
Spirit AirlinesPriceFrom $259Free CancellationRating
6.3
8,157 reviews
Search Spirit Airlines flights
AviancaPriceFrom $307Free CancellationRating
6.6
2,479 reviews
Search Avianca flights
Copa AirlinesPriceFrom $309Free CancellationRating
7.6
1,554 reviews
Search Copa Airlines flights
FrontierPriceFrom $345Free CancellationRating
5.8
3,090 reviews
Search Frontier flights
American AirlinesPriceFrom $347Free CancellationRating
7.2
11,047 reviews
Search American Airlines flights
SouthwestPriceFrom $394Free CancellationRating
8.0
4,250 reviews
Search Southwest flights
United AirlinesPriceFrom $425Free CancellationRating
7.4
9,066 reviews
Search United Airlines flights

Why use momondo?

Why should I use momondo to find a flight deal from Illinois to Costa Rica?

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Costa Rica from Illinois.

Can I find flights from Illinois to Costa Rica with flexible booking policies on momondo?

Yes. All flights to Costa Rica from Illinois on momondo can be compared and filtered by various policies on offer, including flexible booking.

How can momondo help me find flights from Illinois to Costa Rica?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Costa Rica from Illinois.

I’m not ready to book a flight from Illinois to Costa Rica right now. Can momondo alert me if prices change?

Yes momondo offers price alerts on flights to Costa Rica from Illinois. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

An easier way to manage your Costa Rica trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Sat 1/3
Sat 1/10
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to Costa Rica

Popular cities in Costa Rica

Popular flights according to clicks in the last 7 days on momondo
Flights to San Joséfrom $145
Flights to Liberiafrom $176
Flights to Limon
Flights to Tamarindo
Flights to Golfito
Flights to Buenos Aires, Puntarenas
Flights to Palmar Sur