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Cheap flights from Illinois to San Sebastian from $592

This is the cheapest round-trip flight price found by a momondo user in the last 72 hours by searching for a flight from Illinois to San Sebastian departing on 1/12. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Find the cheapest flights from Illinois to San Sebastian

Cheap round-trip flights

Enter your travel dates to find the best prices.
Iberia Logo
2:54 pm - 1:00 pmSTL-EAS
15h 06m2 stops
Iberia Logo
9:30 pm - 10:44 pmEAS-STL
32h 14m2 stops
$592Iberia
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Mon, Jan 12 - Mon, Jan 19
Iberia Logo
1:34 pm - 1:00 pmORD-EAS
16h 26m2 stops
Iberia Logo
9:20 am - 2:55 pmEAS-ORD
12h 35m1 stop
$622Iberia
Find Deal
Wed, Jan 28 - Sun, Feb 1
Iberia Logo
11:38 am - 1:00 pmORD-EAS
18h 22m2 stops
Iberia Logo
9:30 pm - 8:10 pmEAS-ORD
29h 40m2 stops
$642Iberia
Find Deal
Wed, Jan 28 - Sun, Feb 1
American Airlines Logo
11:05 am - 8:50 pmSTL-EAS
26h 45m2 stops
American Airlines Logo
9:20 am - 9:15 pmEAS-STL
18h 55m2 stops
$757American Airlines
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Fri, Feb 6 - Tue, Feb 10
Iberia Logo
4:30 pm - 1:00 pmORD-EAS
13h 30m1 stop
Iberia Logo
9:20 am - 2:15 pmEAS-ORD
11h 55m1 stop
$808Iberia
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Mon, May 18 - Tue, Jun 2
American Airlines Logo
11:38 am - 1:00 pmORD-EAS
18h 22m2 stops
American Airlines Logo
9:20 am - 2:55 pmEAS-ORD
12h 35m1 stop
$822American Airlines
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Wed, Jan 28 - Sun, Feb 1
American Airlines Logo
4:45 pm - 1:00 pmORD-EAS
13h 15m2 stops
American Airlines Logo
9:20 am - 2:15 pmEAS-ORD
11h 55m1 stop
$831American Airlines
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Mon, May 18 - Tue, Jun 2
Iberia Logo
4:30 pm - 8:50 pmORD-EAS
21h 20m1 stop
Iberia Logo
9:20 am - 9:25 pmEAS-ORD
19h 05m2 stops
$836Iberia
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Mon, Mar 30 - Wed, Apr 8
Iberia Logo
4:30 pm - 1:00 pmORD-EAS
13h 30m1 stop
Iberia Logo
9:30 pm - 6:50 pmEAS-ORD
28h 20m1 stop
$837Iberia
Find Deal
Mon, Mar 30 - Wed, Apr 8
American Airlines Logo
10:10 am - 8:40 amORD-EAS
15h 30m2 stops
American Airlines Logo
9:20 am - 8:10 pmEAS-ORD
17h 50m2 stops
$870American Airlines
Find Deal
Wed, Jan 28 - Sun, Feb 1

Iberia flights from Illinois to San Sebastian

Our best Iberia deals on Illinois to San Sebastian flight tickets
Iberia
Jan 12
STL2:54 pmLambert-St Louis
15h 06m
2 stops
EAS1:00 pmSan Sebastián
Jan 19
EAS9:30 pmSan Sebastián
32h 14m
2 stops
STL10:44 pmLambert-St Louis
$592
Find similar
Iberia
Jan 28
ORD1:34 pmChicago O'Hare Intl
16h 26m
2 stops
EAS1:00 pmSan Sebastián
Feb 1
EAS9:20 amSan Sebastián
12h 35m
1 stop
ORD2:55 pmChicago O'Hare Intl
$622
Find similar
Iberia
Jan 28
ORD11:38 amChicago O'Hare Intl
18h 22m
2 stops
EAS1:00 pmSan Sebastián
Feb 1
EAS9:30 pmSan Sebastián
29h 40m
2 stops
ORD8:10 pmChicago O'Hare Intl
$642
Find similar

American Airlines flights from Illinois to San Sebastian

Our best American Airlines deals on Illinois to San Sebastian flight tickets
American Airlines
Jan 28
ORD9:45 pmChicago O'Hare Intl
16h 05m
2 stops
EAS8:50 pmSan Sebastián
Feb 1
EAS9:20 amSan Sebastián
12h 35m
1 stop
ORD2:55 pmChicago O'Hare Intl
$613
Find similar
American Airlines
Feb 6
STL11:05 amLambert-St Louis
26h 45m
2 stops
EAS8:50 pmSan Sebastián
Feb 10
EAS9:20 amSan Sebastián
18h 55m
2 stops
STL9:15 pmLambert-St Louis
$757
Find similar
American Airlines
Jan 28
ORD11:38 amChicago O'Hare Intl
18h 22m
2 stops
EAS1:00 pmSan Sebastián
Feb 1
EAS9:20 amSan Sebastián
12h 35m
1 stop
ORD2:55 pmChicago O'Hare Intl
$822
Find similar

momondo 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, momondo users made 832,500 searches. Data last updated November 30, 2025.
Use the filters below to find and compare flights from Illinois to San Sebastian that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisSan Sebastian

STL - EAS

STLEAS

Lambert-St Louis

Mon 1/12

2:54 pm-1:00 pm

2 stops15h 06m

San Sebastián

Mon 1/19

9:30 pm-10:44 pm

2 stops32h 14m

$592

ChicagoSan Sebastian

ORD - EAS

ORDEAS

Chicago O'Hare Intl

Wed 1/28

1:34 pm-1:00 pm

2 stops16h 26m

San Sebastián

Sun 2/1

9:20 am-2:55 pm

1 stop12h 35m

$622

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

9:30 pm-8:10 pm

2 stops29h 40m

$642

St. LouisSan Sebastian

STL - EAS

STLEAS

Lambert-St Louis

Fri 2/6

11:05 am-8:50 pm

2 stops26h 45m

San Sebastián

Tue 2/10

9:20 am-9:15 pm

2 stops18h 55m

$757

ChicagoSan Sebastian

ORD - EAS

ORDEAS

Chicago O'Hare Intl

Mon 5/18

4:30 pm-1:00 pm

1 stop13h 30m

San Sebastián

Tue 6/2

9:20 am-2:15 pm

1 stop11h 55m

$808

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

$822

ChicagoSan Sebastian

ORD - EAS

ORDEAS

Chicago O'Hare Intl

Mon 5/18

4:45 pm-1:00 pm

2 stops13h 15m

San Sebastián

Tue 6/2

9:20 am-2:15 pm

1 stop11h 55m

$831

ChicagoSan Sebastian

ORD - EAS

ORDEAS

Chicago O'Hare Intl

Mon 3/30

4:30 pm-8:50 pm

1 stop21h 20m

San Sebastián

Wed 4/8

9:20 am-9:25 pm

2 stops19h 05m

$836

ChicagoSan Sebastian

ORD - EAS

ORDEAS

Chicago O'Hare Intl

Mon 3/30

4:30 pm-1:00 pm

1 stop13h 30m

San Sebastián

Wed 4/8

9:30 pm-6:50 pm

1 stop28h 20m

$837

ChicagoSan Sebastian

ORD - EAS

ORDEAS

Chicago O'Hare Intl

Wed 1/28

10:10 am-8:40 am

2 stops15h 30m

San Sebastián

Sun 2/1

9:20 am-8:10 pm

2 stops17h 50m

$870

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to San Sebastian from

How to get the cheapest flight ticket from Illinois to San Sebastian

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 day to depart on your flight to San Sebastian?

On average, the least expensive day to fly to San Sebastian from Illinois is on a Friday. momondo users have found tickets for Friday departures for as low as $827. However, this price may fluctuate depending on the airline, the season, and holidays. When flying out on a Tuesday, the most expensive travel day of the week, you can expect to see flight prices from Illinois to San Sebastian for around $1,488.

What is the cheapest time of day to depart on your flight to San Sebastian?

Flying to San Sebastian from Illinois in the morning is the least expensive time of day to depart. momondo users have found prices as low as $962 when looking at flights departing in the morning. Flights to San Sebastian are more costly in the afternoon, with an average ticket price of $1,256. Departure times in the afternoon fall within the peak daily travel times, which is why tickets can be more expensive.

Cheap Illinois to San Sebastian flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Illinois to San Sebastian

Fastest flight time

13h 30m

Direct flights

None
The fastest flight from Illinois to San Sebastian takes 13h 30m
There are no direct flights from Illinois to San Sebastian. There are no popular flight routes from Illinois to San Sebastian.
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  • When did momondo last update prices for flights from Illinois to San Sebastián Airport?

    Prices for flights from Illinois to San Sebastián Airport were last updated today.

  • How many operators does momondo search for flights from Illinois to San Sebastián Airport?

  • How old do you have to be to fly from Illinois to San Sebastián Airport?

    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 San Sebastián Airport.

  • What documentation or ID do you need to fly to San Sebastián Airport?

    The required travel and health documents for your San Sebastián Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at San Sebastián Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

Best airlines flying from Illinois to San Sebastian

Compare and see reviews for airlines that fly from Illinois to San Sebastian with momondo
Airline
Rating
Free Cancellation
Price
American AirlinesPriceFrom $694Free CancellationRating
7.2
11,042 reviews
Search American Airlines flights

Traveling to a place near San Sebastian?

Book flights to San Sebastian if you plan to visit one of these locations
Irun
Hondarribia

Why use momondo?

Why should I use momondo to find a flight deal from Illinois to San Sebastian?

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Illinois to San Sebastian for you.

Can I find flights from Illinois to San Sebastian with flexible booking policies on momondo?

Yes. momondo enables you to select and highlight flights to San Sebastian from Illinois with this policy.

How can momondo help me find flights from Illinois to San Sebastian?

momondo provides multiple filters to help you find the best flight to San Sebastian from Illinois. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

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

Of course. momondo tracks the price of Illinois to San Sebastian flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

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