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Cheap flights from Illinois to San Sebastian from $621

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 11/27. 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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Cheap round-trip flights

Enter your travel dates to find the best prices.
American Airlines Logo
11:50 am - 1:00 pmORD-EAS
18h 10m2 stops
American Airlines Logo
9:20 am - 2:30 pmEAS-ORD
12h 10m1 stop
$621American Airlines
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Thu, Nov 27 - Thu, Dec 4
American Airlines Logo
10:05 am - 8:40 amORD-EAS
15h 35m2 stops
American Airlines Logo
9:20 am - 8:24 pmEAS-ORD
18h 04m2 stops
$631American Airlines
Find Deal
Wed, Jan 28 - Sun, Feb 1
Multiple Airlines Logo
10:40 am - 8:40 amORD-EAS
15h 00m2 stops
Multiple Airlines Logo
9:30 pm - 2:30 pmEAS-ORD
24h 00m1 stop
$661Multiple Airlines
Find Deal
Sat, Feb 14 - Fri, Feb 20
Multiple Airlines Logo
10:40 am - 8:40 amORD-EAS
15h 00m2 stops
Multiple Airlines Logo
9:30 pm - 2:01 pmEAS-ORD
23h 31m2 stops
$664Multiple Airlines
Find Deal
Sat, Feb 14 - Fri, Feb 20
Multiple Airlines Logo
4:45 pm - 8:40 amORD-EAS
32h 55m1 stop
Multiple Airlines Logo
9:30 pm - 2:30 pmEAS-ORD
24h 00m1 stop
$665Multiple Airlines
Find Deal
Sat, Feb 14 - Fri, Feb 20
Iberia Logo
9:00 am - 1:00 pmORD-EAS
21h 00m2 stops
Iberia Logo
9:20 am - 2:30 pmEAS-ORD
12h 10m1 stop
$721Iberia
Find Deal
Wed, Jan 28 - Sun, Feb 1
American Airlines Logo
11:50 am - 1:00 pmORD-EAS
18h 10m2 stops
American Airlines Logo
9:20 am - 7:39 pmEAS-ORD
17h 19m2 stops
$728American Airlines
Find Deal
Thu, Nov 27 - Thu, Dec 4
Multiple Airlines Logo
8:25 pm - 8:40 amORD-EAS
29h 15m3 stops
Multiple Airlines Logo
2:05 pm - 3:25 pmEAS-ORD
32h 20m2 stops
$780Multiple Airlines
Find Deal
Sun, Feb 15 - Thu, Feb 19
Iberia Logo
4:45 pm - 1:00 pmORD-EAS
13h 15m1 stop
Iberia Logo
9:20 am - 2:30 pmEAS-ORD
12h 10m1 stop
$816Iberia
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Thu, Nov 27 - Thu, Dec 4
Iberia Logo
4:45 pm - 1:00 pmORD-EAS
13h 15m1 stop
Iberia Logo
9:30 pm - 2:30 pmEAS-ORD
24h 00m1 stop
$1,035Iberia
Find Deal
Fri, Nov 7 - Tue, Nov 11

American Airlines flights from Illinois to San Sebastian

Our best American Airlines deals on Illinois to San Sebastian flight tickets
American Airlines
Nov 27
ORD11:50 amChicago O'Hare Intl
18h 10m
2 stops
EAS1:00 pmSan Sebastián
Dec 4
EAS9:20 amSan Sebastián
12h 10m
1 stop
ORD2:30 pmChicago O'Hare Intl
$621
Find similar
American Airlines
Jan 28
ORD10:05 amChicago O'Hare Intl
15h 35m
2 stops
EAS8:40 amSan Sebastián
Feb 1
EAS9:20 amSan Sebastián
18h 04m
2 stops
ORD8:24 pmChicago O'Hare Intl
$631
Find similar
American Airlines
Nov 27
ORD11:50 amChicago O'Hare Intl
18h 10m
2 stops
EAS1:00 pmSan Sebastián
Dec 4
EAS9:20 amSan Sebastián
17h 19m
2 stops
ORD7:39 pmChicago O'Hare Intl
$728
Find similar

Iberia flights from Illinois to San Sebastian

Our best Iberia deals on Illinois to San Sebastian flight tickets
Iberia
Jan 28
ORD9:00 amChicago O'Hare Intl
21h 00m
2 stops
EAS1:00 pmSan Sebastián
Feb 1
EAS9:20 amSan Sebastián
12h 10m
1 stop
ORD2:30 pmChicago O'Hare Intl
$721
Find similar
Iberia
Nov 27
ORD4:45 pmChicago O'Hare Intl
13h 15m
1 stop
EAS1:00 pmSan Sebastián
Dec 4
EAS9:20 amSan Sebastián
12h 10m
1 stop
ORD2:30 pmChicago O'Hare Intl
$816
Find similar
Iberia
Nov 7
ORD4:45 pmChicago O'Hare Intl
13h 15m
1 stop
EAS1:00 pmSan Sebastián
Nov 11
EAS9:30 pmSan Sebastián
24h 00m
1 stop
ORD2:30 pmChicago O'Hare Intl
$1,035
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 October 14, 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

ChicagoSan Sebastian

ORD - EAS

ORDEAS

Chicago O'Hare Intl

Thu 11/27

11:50 am-1:00 pm

2 stops18h 10m

San Sebastián

Thu 12/4

9:20 am-2:30 pm

1 stop12h 10m

$621

ChicagoSan Sebastian

ORD - EAS

ORDEAS

Chicago O'Hare Intl

Wed 1/28

10:05 am-8:40 am

2 stops15h 35m

San Sebastián

Sun 2/1

9:20 am-8:24 pm

2 stops18h 04m

$631

ChicagoSan Sebastian

ORD - EAS

ORDEAS

Chicago O'Hare Intl

Sat 2/14

10:40 am-8:40 am

2 stops15h 00m

San Sebastián

Fri 2/20

9:30 pm-2:30 pm

1 stop24h 00m

$661

ChicagoSan Sebastian

ORD - EAS

ORDEAS

Chicago O'Hare Intl

Sat 2/14

10:40 am-8:40 am

2 stops15h 00m

San Sebastián

Fri 2/20

9:30 pm-2:01 pm

2 stops23h 31m

$664

ChicagoSan Sebastian

ORD - EAS

ORDEAS

Chicago O'Hare Intl

Sat 2/14

4:45 pm-8:40 am

1 stop32h 55m

San Sebastián

Fri 2/20

9:30 pm-2:30 pm

1 stop24h 00m

$665

ChicagoSan Sebastian

ORD - EAS

ORDEAS

Chicago O'Hare Intl

Wed 1/28

9:00 am-1:00 pm

2 stops21h 00m

San Sebastián

Sun 2/1

9:20 am-2:30 pm

1 stop12h 10m

$721

ChicagoSan Sebastian

ORD - EAS

ORDEAS

Chicago O'Hare Intl

Thu 11/27

11:50 am-1:00 pm

2 stops18h 10m

San Sebastián

Thu 12/4

9:20 am-7:39 pm

2 stops17h 19m

$728

ChicagoSan Sebastian

ORD - EAS

ORDEAS

Chicago O'Hare Intl

Sun 2/15

8:25 pm-8:40 am

3 stops29h 15m

San Sebastián

Thu 2/19

2:05 pm-3:25 pm

2 stops32h 20m

$780

ChicagoSan Sebastian

ORD - EAS

ORDEAS

Chicago O'Hare Intl

Thu 11/27

4:45 pm-1:00 pm

1 stop13h 15m

San Sebastián

Thu 12/4

9:20 am-2:30 pm

1 stop12h 10m

$816

ChicagoSan Sebastian

ORD - EAS

ORDEAS

Chicago O'Hare Intl

Fri 11/7

4:45 pm-1:00 pm

1 stop13h 15m

San Sebastián

Tue 11/11

9:30 pm-2:30 pm

1 stop24h 00m

$1,035

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

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

Direct flights

None
There are no direct flights from Illinois to San Sebastian. There are no popular flight routes from Illinois to San Sebastian.
Search flight deals

  • 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
11,045 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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