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Cheap flights from Chicago to San Sebastian from $402

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Chicago to San Sebastian departing on 9/23. 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 Chicago to San Sebastian

Cheap round-trip flights

Enter your travel dates to find the best prices.
Iberia Logo
6:35 pm - 8:50 pm
ORD
-
EAS
19h 15m
2 stops
Iberia Logo
9:20 am - 2:25 pm
EAS
-
ORD
12h 05m
1 stop
$830Iberia
Sun, Oct 4 - Wed, Oct 14
Iberia Logo
10:20 pm - 8:40 am
ORD
-
EAS
27h 20m
1 stop
Iberia Logo
9:20 am - 2:25 pm
EAS
-
ORD
12h 05m
1 stop
$834Iberia
Sun, Oct 4 - Wed, Oct 14
Iberia Logo
4:55 pm - 8:50 pm
ORD
-
EAS
20h 55m
1 stop
Iberia Logo
9:30 pm - 4:00 pm
EAS
-
ORD
25h 30m
1 stop
$836Iberia
Mon, Sep 28 - Mon, Oct 5
Iberia Logo
4:45 pm - 1:00 pm
ORD
-
EAS
13h 15m
2 stops
Iberia Logo
9:30 pm - 4:00 pm
EAS
-
ORD
25h 30m
1 stop
$841Iberia
Mon, Sep 28 - Mon, Oct 5
Iberia Logo
9:27 am - 8:40 am
ORD
-
EAS
16h 13m
2 stops
Iberia Logo
9:30 pm - 3:10 pm
EAS
-
ORD
24h 40m
2 stops
$849Iberia
Mon, Sep 28 - Mon, Oct 5
Iberia Logo
10:15 pm - 8:40 am
ORD
-
EAS
27h 25m
1 stop
Iberia Logo
1:40 pm - 7:45 pm
EAS
-
ORD
37h 05m
2 stops
$857Iberia
Wed, Sep 30 - Wed, Oct 7
Iberia Logo
6:35 pm - 8:40 am
ORD
-
EAS
31h 05m
2 stops
Iberia Logo
1:40 pm - 7:45 pm
EAS
-
ORD
37h 05m
2 stops
$861Iberia
Wed, Sep 30 - Wed, Oct 7
Iberia Logo
4:55 pm - 8:50 pm
ORD
-
EAS
20h 55m
1 stop
Iberia Logo
9:30 pm - 4:00 pm
EAS
-
ORD
25h 30m
1 stop
$867Iberia
Mon, Sep 28 - Mon, Oct 5
Iberia Logo
9:27 am - 8:40 am
ORD
-
EAS
16h 13m
2 stops
Iberia Logo
9:30 pm - 4:00 pm
EAS
-
ORD
25h 30m
1 stop
$872Iberia
Mon, Sep 28 - Mon, Oct 5
Iberia Logo
10:15 pm - 8:40 am
ORD
-
EAS
27h 25m
1 stop
Iberia Logo
9:30 pm - 5:20 pm
EAS
-
ORD
26h 50m
2 stops
$874Iberia
Tue, Sep 8 - Tue, Sep 15

Iberia flights from Chicago to San Sebastian

Our best Iberia deals on Chicago to San Sebastian flight tickets
Iberia
Oct 4
ORD6:35 pmChicago O'Hare Intl
19h 15m
2 stops
EAS8:50 pmSan Sebastián
Oct 14
EAS9:20 amSan Sebastián
12h 05m
1 stop
ORD2:25 pmChicago O'Hare Intl
$830
Iberia
Oct 4
ORD10:20 pmChicago O'Hare Intl
27h 20m
1 stop
EAS8:40 amSan Sebastián
Oct 14
EAS9:20 amSan Sebastián
12h 05m
1 stop
ORD2:25 pmChicago O'Hare Intl
$834
Iberia
Sep 28
ORD4:55 pmChicago O'Hare Intl
20h 55m
1 stop
EAS8:50 pmSan Sebastián
Oct 5
EAS9:30 pmSan Sebastián
25h 30m
1 stop
ORD4:00 pmChicago O'Hare Intl
$836

American Airlines flights from Chicago to San Sebastian

Our best American Airlines deals on Chicago to San Sebastian flight tickets
American Airlines
Sep 30
ORD9:27 amChicago O'Hare Intl
16h 13m
2 stops
EAS8:40 amSan Sebastián
Oct 7
EAS9:20 amSan Sebastián
17h 15m
2 stops
ORD7:35 pmChicago O'Hare Intl
$920
American Airlines
Aug 11
ORD8:54 amChicago O'Hare Intl
16h 46m
2 stops
EAS8:40 amSan Sebastián
Aug 22
EAS9:20 amSan Sebastián
12h 05m
1 stop
ORD2:25 pmChicago O'Hare Intl
$951
American Airlines
Sep 8
ORD7:30 amChicago O'Hare Intl
18h 10m
2 stops
EAS8:40 amSan Sebastián
Sep 15
EAS9:20 amSan Sebastián
19h 05m
2 stops
ORD9:25 pmChicago O'Hare Intl
$957

momondo Fare Finder

 
Customize your flight search to find flights from Chicago 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 May 3, 2026.
Use the filters below to find and compare flights from Chicago to San Sebastian that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip
Quickest round-trip

ChicagoSan Sebastian

ORD - EAS

ORDEAS

Chicago O'Hare Intl

Sun 10/4

6:35 pm-8:50 pm

2 stops19h 15m

San Sebastián

Wed 10/14

9:20 am-2:25 pm

1 stop12h 05m

$830

ChicagoSan Sebastian

ORD - EAS

ORDEAS

Chicago O'Hare Intl

Sun 10/4

10:20 pm-8:40 am

1 stop27h 20m

San Sebastián

Wed 10/14

9:20 am-2:25 pm

1 stop12h 05m

$834

ChicagoSan Sebastian

ORD - EAS

ORDEAS

Chicago O'Hare Intl

Mon 9/28

4:55 pm-8:50 pm

1 stop20h 55m

San Sebastián

Mon 10/5

9:30 pm-4:00 pm

1 stop25h 30m

$836

ChicagoSan Sebastian

ORD - EAS

ORDEAS

Chicago O'Hare Intl

Mon 9/28

4:45 pm-1:00 pm

2 stops13h 15m

San Sebastián

Mon 10/5

9:30 pm-4:00 pm

1 stop25h 30m

$841

ChicagoSan Sebastian

ORD - EAS

ORDEAS

Chicago O'Hare Intl

Mon 9/28

9:27 am-8:40 am

2 stops16h 13m

San Sebastián

Mon 10/5

9:30 pm-3:10 pm

2 stops24h 40m

$849

ChicagoSan Sebastian

ORD - EAS

ORDEAS

Chicago O'Hare Intl

Wed 9/30

10:15 pm-8:40 am

1 stop27h 25m

San Sebastián

Wed 10/7

1:40 pm-7:45 pm

2 stops37h 05m

$857

ChicagoSan Sebastian

ORD - EAS

ORDEAS

Chicago O'Hare Intl

Wed 9/30

6:35 pm-8:40 am

2 stops31h 05m

San Sebastián

Wed 10/7

1:40 pm-7:45 pm

2 stops37h 05m

$861

ChicagoSan Sebastian

ORD - EAS

ORDEAS

Chicago O'Hare Intl

Mon 9/28

4:55 pm-8:50 pm

1 stop20h 55m

San Sebastián

Mon 10/5

9:30 pm-4:00 pm

1 stop25h 30m

$867

ChicagoSan Sebastian

ORD - EAS

ORDEAS

Chicago O'Hare Intl

Mon 9/28

9:27 am-8:40 am

2 stops16h 13m

San Sebastián

Mon 10/5

9:30 pm-4:00 pm

1 stop25h 30m

$872

ChicagoSan Sebastian

ORD - EAS

ORDEAS

Chicago O'Hare Intl

Tue 9/8

10:15 pm-8:40 am

1 stop27h 25m

San Sebastián

Tue 9/15

9:30 pm-5:20 pm

2 stops26h 50m

$874

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 Chicago 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 airline that flies from Chicago to San Sebastián?

American Airlines and Iberia are the most popular carriers operating from Chicago to San Sebastián

What airlines fly to San Sebastian?

Lufthansa, United Airlines and American Airlines are the top three most popular airlines that fly to San Sebastian from Chicago according to our data. Lufthansa is the first choice among our users, with 43% of people opting to fly with this airline when traveling to San Sebastian. Keep in mind that there are 3 different airlines that fly to San Sebastian on a routine basis, so you have a few additional options to choose from.

When to book flights from Chicago to San Sebastian

Are you open to changing your travel dates? Check out the ideal times to fly from Chicago to San Sebastian according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Chicago to San Sebastian (CHI to EAS) flight deals and tips

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

Fastest flight time

13h 05m

Direct flights

None
The fastest flight from Chicago to San Sebastian takes 13h 05m
There are no direct flights from Chicago to San Sebastian. There are no popular flight routes from Chicago to San Sebastian.
Search flight deals

Frequently asked questions about flying from Chicago to San Sebastian

  • How far is Chicago to San Sebastián by plane?

    Chicago and San Sebastián are 4147.4 mi apart from one another. Typically, this will take 13h 05m by plane in normal conditions.

  • When did momondo last update prices for flights from Chicago to San Sebastián Airport?

    Prices for flights from Chicago to San Sebastián Airport refresh daily.

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

  • How old do you have to be to fly from Chicago 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 Chicago to San Sebastián Airport.

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

    The travel and health documents you'll need for your trip to San Sebastián Airport 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 San Sebastián Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

Best airlines flying from Chicago to San Sebastian

Compare and see reviews for airlines that fly from Chicago to San Sebastian with momondo
Airline
Rating
Free Cancellation
Price
American AirlinesPriceFrom $694Free CancellationRating
7.1
11,674 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 Chicago to San Sebastian?

It is quick and easy to find Chicago to San Sebastian flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to San Sebastian that suits you.

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

All flight searches from Chicago to San Sebastian on momondo can be filtered to show those which offer flexible booking policies.

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

momondo helps you find the best flight between Chicago and San Sebastian by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

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

Price alerts on flights to San Sebastian from Chicago are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

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