$343+ Cheap flights from Illinois to San Sebastian (EAS)
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 1/28. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — EAS
Jan 17 — Jan 241
1 adult, Economy
We work with more than 300 partners to bring you better travel deals
Find cheap flights from Illinois to San Sebastian 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 Illinois to San Sebastian
Best flights from Illinois to San SebastianDiscover carefully curated flight deals from Illinois to San Sebastian that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated December 18, 2025.
Discover carefully curated flight deals from Illinois to San Sebastian that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated December 18, 2025.
This Expedia deal was found by Cheapflights users on 12/16. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 1/302:54 pmSTL - EAS
2 stops22h 56mIberia
Fri 2/69:20 amEAS - STL
2 stops15h 54mIberia
Deal found 12/16![Iberia logo]()
$582
This American Airlines deal was found by Cheapflights users on 12/18. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 1/288:12 amORD - EAS
2 stops17h 28mAmerican Airlines
Sun 2/19:20 amEAS - ORD
2 stops17h 50mAmerican Airlines
Deal found 12/18![American Airlines logo]()
$781
This Expedia deal was found by Cheapflights users on 12/16. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 1/305:40 pmORD - EAS
1 stop20h 10mIberia
Fri 2/69:20 amEAS - ORD
1 stop12h 35mIberia
Deal found 12/16![Iberia logo]()
$767
This American Airlines deal was found by Cheapflights users on 12/16. 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 1/303:55 pmORD - EAS
2 stops21h 55mAmerican Airlines
Fri 2/69:20 amEAS - ORD
2 stops17h 02mAmerican Airlines
Deal found 12/16![American Airlines logo]()
$781
This Iberia deal was found by Cheapflights users on 12/16. 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 Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 1/2811:38 amORD - EAS
2 stops18h 22mIberia
Sun 2/19:20 amEAS - ORD
1 stop12h 35mIberia
Deal found 12/16![Iberia logo]()
$771
This American Airlines deal was found by Cheapflights users on 12/16. 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.
Thu 1/158:16 amORD - EAS
2 stops17h 24mAmerican Airlines
Mon 1/199:30 pmEAS - ORD
2 stops23h 20mAmerican Airlines
Deal found 12/16![American Airlines logo]()
$816
This Expedia deal was found by Cheapflights users on 12/17. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 1/315:50 pmORD - EAS
2 stops31h 50mIberia
Sat 2/79:30 pmEAS - ORD
1 stop24h 25mIberia
Deal found 12/17![Iberia logo]()
$794
This Iberia deal was found by Cheapflights users on 12/17. 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 Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/49:33 amSTL - EAS
2 stops28h 17mIberia
Sun 2/81:40 pmEAS - STL
2 stops26h 23mIberia
Deal found 12/17![Iberia logo]()
$810
This American Airlines deal was found by Cheapflights users on 12/16. 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 5/183:20 pmORD - EAS
2 stops14h 40mAmerican Airlines
Tue 6/29:20 amEAS - ORD
1 stop11h 55mAmerican Airlines
Deal found 12/16![American Airlines logo]()
$931
Find flight deals from Illinois to San Sebastian
Keep the following information in mind while searching for Illinois to San Sebastian flight deals. Data was last updated December 18, 2025.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | Expedia 3 stars |
Round-trip from | $582 (Expedia) |
One-way from | $343 (Kiwi.com) |
Cheapflights Fare Finder
Customize your flight search to find flights from Illinois to San Sebastian 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 December 18, 2025.
Use the filters below to find and compare flights from Illinois to San Sebastian that are best for you.
Fly from
Illinois
Fly to
San Sebastian
Route
Depart
Return
Price
St. LouisSan Sebastian
STL - EAS
STLEAS
Lambert-St Louis
Fri 1/30
2:54 pm-8:50 pm
2 stops22h 56m
San Sebastián
Fri 2/6
9:20 am-6:14 pm
2 stops15h 54m
$582
ChicagoSan Sebastian
ORD - EAS
ORDEAS
Chicago O'Hare Intl
Fri 1/30
5:40 pm-8:50 pm
1 stop20h 10m
San Sebastián
Fri 2/6
9:20 am-2:55 pm
1 stop12h 35m
$767
ChicagoSan Sebastian
ORD - EAS
ORDEAS
Chicago O'Hare Intl
Wed 1/28
11:38 am-1:00 pm
2 stops18h 22m
San Sebastián
Sun 2/1
9:20 am-2:55 pm
1 stop12h 35m
$771
ChicagoSan Sebastian
ORD - EAS
ORDEAS
Chicago O'Hare Intl
Wed 1/28
8:12 am-8:40 am
2 stops17h 28m
San Sebastián
Sun 2/1
9:20 am-8:10 pm
2 stops17h 50m
$781
ChicagoSan Sebastian
ORD - EAS
ORDEAS
Chicago O'Hare Intl
Fri 1/30
3:55 pm-8:50 pm
2 stops21h 55m
San Sebastián
Fri 2/6
9:20 am-7:22 pm
2 stops17h 02m
$781
ChicagoSan Sebastian
ORD - EAS
ORDEAS
Chicago O'Hare Intl
Sat 1/31
5:50 pm-8:40 am
2 stops31h 50m
San Sebastián
Sat 2/7
9:30 pm-2:55 pm
1 stop24h 25m
$794
St. LouisSan Sebastian
STL - EAS
STLEAS
Lambert-St Louis
Wed 2/4
9:33 am-8:50 pm
2 stops28h 17m
San Sebastián
Sun 2/8
1:40 pm-9:03 am
2 stops26h 23m
$810
ChicagoSan Sebastian
ORD - EAS
ORDEAS
Chicago O'Hare Intl
Thu 1/15
8:16 am-8:40 am
2 stops17h 24m
San Sebastián
Mon 1/19
9:30 pm-1:50 pm
2 stops23h 20m
$816
ChicagoSan Sebastian
ORD - EAS
ORDEAS
Chicago O'Hare Intl
Mon 5/18
3:20 pm-1:00 pm
2 stops14h 40m
San Sebastián
Tue 6/2
9:20 am-2:15 pm
1 stop11h 55m
$931
ChicagoSan Sebastian
ORD - EAS
ORDEAS
Chicago O'Hare Intl
Wed 1/28
6:30 pm-1:00 pm
3 stops35h 30m
$343
Best time to book a flight from Illinois to San Sebastian
Have a flexible travel schedule? Discover the best time to fly to San Sebastian 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 San Sebastian
What is the cheapest month to book a flight from Illinois to San Sebastian?
Currently, August is the cheapest month in which you can book a flight from Illinois to San Sebastian (average of $547). Flying from Illinois to San Sebastian in December is currently the most expensive (average of $866). 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 EAS?
Find hourly flight availability from Illinois to San Sebastian. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated December 18, 2025.
It’s typically best to fly out from Illinois to San Sebastian in the afternoon. Doing so could potentially save you 43% on the flight price compared to flying at noon, which is usually more expensive.
Related info for your journey
Find useful and relevant information for your journey from Illinois to San Sebastian. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
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 Illinois to San Sebastian
See prices for flight routes from nearby airports that may be better suited for you.
Top airline flying from Illinois to San Sebastian
Discover the top airline that operate flights from Illinois to San Sebastian. 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 December 18, 2025.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$694 | Average$1,754 | FlexibilityNo cancel fee | On-time71% |