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$309+ Cheap flights from Chicago (CHI) to Bilbao (BIO)

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 11/7. Fares are subject to change and may not be available on all flights or dates of travel.
CHI — BIO
Nov 19 — Nov 261
Wed 11/19
Wed 11/26
1 adult, Economy
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Cheap flight deals from Chicago to Bilbao

Discover tips and strategies to find the most affordable flight options for your journey from Chicago (CHI) to Bilbao (BIO). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated October 20, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$515
(Booking.com)

One-way from

$309
(Kiwi.com)

Popular in

April

Cheapest in

February

Average price

$613
Provider with most accurate pricing for Chicago (CHI)-Bilbao flight deals.
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Provider most trusted by Cheapflights users for Chicago (CHI)-Bilbao flights.
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From Chicago (CHI) to Bilbao
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One-way flight from Chicago (CHI) to Bilbao
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Highest demand for flights based on searches. 28% potential increase in price ($387 potential increase over avg. RT price).
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Cheapest flight prices on average. 18% potential price decrease ($151 potential savings vs. average RT price).
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Average for round-trip flights in October 2025
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Find flight deals from Chicago to Bilbao

Cheapest flights from Chicago to Bilbao
Explore the most affordable flight options available from Chicago to Bilbao. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 20, 2025.

This United Airlines deal was found by Cheapflights users on 10/19. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/42:39 pmORD - BIO
2 stops20h 26mUnited Airlines
Thu 12/116:45 amBIO - ORD
1 stop13h 25mUnited Airlines
Deal found 10/19$522
This Delta deal was found by Cheapflights users on 10/18. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/310:36 amORD - BIO
2 stops17h 54mDelta
Wed 12/106:50 amBIO - ORD
1 stop14h 30mDelta
Deal found 10/18$524
This Booking.com deal was found by Cheapflights users on 10/18. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/310:35 pmORD - BIO
1 stop17h 45mLufthansa
Wed 12/1012:50 pmBIO - ORD
1 stop14h 15mLufthansa
Deal found 10/18$526
This Delta deal was found by Cheapflights users on 10/19. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/49:34 amMDW - BIO
2 stops18h 46mDelta
Thu 12/116:50 amBIO - MDW
2 stops18h 10mDelta
Deal found 10/19$540
This FlightHub deal was found by Cheapflights users on 10/20. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/411:50 amORD - BIO
1 stop21h 20mTurkish Airlines
Thu 11/205:10 pmBIO - ORD
1 stop23h 55mTurkish Airlines
Deal found 10/20$551
This Mytrip deal was found by Cheapflights users on 10/18. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/310:00 amORD - BIO
3 stops29h 20mMultiple Airlines
Wed 12/1011:25 amBIO - ORD
3 stops32h 45mMultiple Airlines
Deal found 10/18$569
This Ovago deal was found by Cheapflights users on 10/18. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/167:10 amORD - BIO
2 stops28h 30mScandinavian Airlines
Fri 11/217:30 pmBIO - ORD
1 stop28h 15mScandinavian Airlines
Deal found 10/18$643
This Mytrip deal was found by Cheapflights users on 10/20. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/126:50 pmORD - BIO
3 stops29h 50mMultiple Airlines
Tue 11/259:00 amBIO - ORD
3 stops35h 10mMultiple Airlines
Deal found 10/20$655
This Cheapflightsfares deal was found by Cheapflights users on 10/20. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/129:50 pmORD - BIO
1 stop13h 15mLufthansa
Tue 11/256:45 amBIO - ORD
1 stop13h 25mLufthansa
Deal found 10/20$667
This Mytrip deal was found by Cheapflights users on 10/19. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/46:30 pmORD - BIO
3 stops21h 00mMultiple Airlines
Thu 12/117:45 amBIO - ORD
2 stops16h 35mMultiple Airlines
Deal found 10/19$671
This Delta deal was found by Cheapflights users on 10/19. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/1212:47 pmMDW - BIO
2 stops15h 43mDelta
Sun 11/1611:55 amBIO - MDW
2 stops37h 23mDelta
Deal found 10/19$714
This KLM deal was found by Cheapflights users on 10/18. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/161:47 pmMDW - BIO
2 stops14h 43mKLM
Fri 11/216:50 amBIO - MDW
2 stops16h 48mKLM
Deal found 10/18$1,524

Cheapflights Fare Finder

 
Customize your flight search to find flights from Chicago to Bilbao 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 October 20, 2025.
Use the filters below to find and compare flights from Chicago to Bilbao that are best for you.

Fly from

Chicago

Fly to

Bilbao

Route

Depart

Return

Price

ChicagoBilbao

ORD - BIO

ORDBIO

Chicago O'Hare Intl

Tue 2/10

8:15 pm-12:05 pm

2 stops32h 50m

Bilbao

Mon 2/23

12:50 pm-8:05 pm

1 stop14h 15m

$515

ChicagoBilbao

ORD - BIO

ORDBIO

Chicago O'Hare Intl

Wed 1/28

5:55 pm-4:10 pm

1 stop15h 15m

Bilbao

Sun 2/1

6:45 am-3:20 pm

1 stop15h 35m

$520

ChicagoBilbao

ORD - BIO

ORDBIO

Chicago O'Hare Intl

Thu 12/4

2:39 pm-6:05 pm

2 stops20h 26m

Bilbao

Thu 12/11

6:45 am-1:10 pm

1 stop13h 25m

$522

ChicagoBilbao

ORD - BIO

ORDBIO

Chicago O'Hare Intl

Wed 12/3

10:36 am-11:30 am

2 stops17h 54m

Bilbao

Wed 12/10

6:50 am-2:20 pm

1 stop14h 30m

$524

ChicagoBilbao

ORD - BIO

ORDBIO

Chicago O'Hare Intl

Wed 12/3

10:35 pm-11:20 pm

1 stop17h 45m

Bilbao

Wed 12/10

12:50 pm-8:05 pm

1 stop14h 15m

$526

ChicagoBilbao

ORD - BIO

ORDBIO

Chicago O'Hare Intl

Thu 12/4

10:35 pm-10:50 pm

1 stop17h 15m

Bilbao

Thu 12/11

12:50 pm-8:05 pm

1 stop14h 15m

$526

ChicagoBilbao

ORD - BIO

ORDBIO

Chicago O'Hare Intl

Fri 2/13

5:20 pm-5:20 pm

1 stop17h 00m

Bilbao

Fri 2/20

6:50 am-6:57 pm

2 stops19h 07m

$530

ChicagoBilbao

MDW - BIO

MDWBIO

Chicago Midway

Thu 12/4

9:34 am-11:20 am

2 stops18h 46m

Bilbao

Thu 12/11

6:50 am-6:00 pm

2 stops18h 10m

$540

ChicagoBilbao

MDW - BIO

MDWBIO

Chicago Midway

Tue 2/10

1:00 pm-11:30 am

2 stops15h 30m

Bilbao

Fri 2/20

6:50 am-4:25 pm

2 stops16h 35m

$614

ChicagoBilbao

MDW - BIO

MDWBIO

Chicago Midway

Wed 11/12

6:00 am-5:20 pm

2 stops28h 20m

Bilbao

Sun 11/16

11:55 am-6:18 pm

2 stops37h 23m

$714

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/19

Showing 1-10 of 29 results
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Compare providers for flights from Chicago to Bilbao

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Chicago to Bilbao in October.
ProviderPrice AccuracyTrust Score*
FlightHubPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Chicago-Bilbao flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Chicago-Bilbao flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Chicago-Bilbao flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Chicago-Bilbao flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Chicago-Bilbao flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Chicago to Bilbao

Have a flexible travel schedule? Discover the best time to fly to Bilbao from Chicago 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 Chicago to Bilbao

What is the cheapest month to book a flight from Chicago to Bilbao?

Currently, August is the cheapest month in which you can book a flight from Chicago to Bilbao (average of $547). Flying from Chicago to Bilbao in July is currently the most expensive (average of $871). 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 CHI to BIO?

Find hourly flight availability from Chicago to Bilbao. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated October 20, 2025.

Unlike in the afternoon, when flights are generally more expensive, you can save up to 57% on flights from Chicago to Bilbao by exploring options for tickets in the morning.

Reviews of airlines servicing Bilbao

Get insights into the airlines that provide service to Bilbao. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Bilbao. Reviews last updated October 20, 2025.
See what other customers who have flown with United Airlines, Turkish Airlines, and Iberia from Chicago to Bilbao have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
8,991 reviews

Comfort

7.3

Boarding

7.7

Crew

8.1

Entertainment

7.1

Food

6.6

Overall

7.4

Reviews

1 / 20
4.0
Okay

Tim,Sep 2025

IAD - GSP

This was pretty bad. It’s chaos at the Dulles boarding gates for the small regional jets because they use one gate to board 3-4 flights at a time. So, it’s difficult knowing where and when to go. There is little space for any size of carrry-on, so most had to gate check their bags. However, the worst of it was that our single flight attendant fell asleep before we took off and the pilot couldn’t do so until she responded to his messages. My wife had to wake her up! So we were a little late leaving. Not to be thwarted, the flight attendant fell asleep right after take off and there was no sight of her during the flight. When the aircraft touched down, a tray of unsecured canned drinks came crashing onto the aisle up front. I can only assume someone didn’t do what they were supposed to. The pilot was great, but I’m sure he must not be happy with this crew member.
United Airlines
7.4
Good
8,991 reviews
United Airlines
7.4
Good
8,991 reviews

Comfort

7.3

Boarding

7.7

Crew

8.1

Entertainment

7.1

Food

6.6

Overall

7.4

Reviews

1 / 20
4.0
Okay

Tim,Sep 2025

IAD - GSP

This was pretty bad. It’s chaos at the Dulles boarding gates for the small regional jets because they use one gate to board 3-4 flights at a time. So, it’s difficult knowing where and when to go. There is little space for any size of carrry-on, so most had to gate check their bags. However, the worst of it was that our single flight attendant fell asleep before we took off and the pilot couldn’t do so until she responded to his messages. My wife had to wake her up! So we were a little late leaving. Not to be thwarted, the flight attendant fell asleep right after take off and there was no sight of her during the flight. When the aircraft touched down, a tray of unsecured canned drinks came crashing onto the aisle up front. I can only assume someone didn’t do what they were supposed to. The pilot was great, but I’m sure he must not be happy with this crew member.
Turkish Airlines
7.3
Good
4,022 reviews
United Airlines
7.4
Good
8,991 reviews

Comfort

7.3

Boarding

7.7

Crew

8.1

Entertainment

7.1

Food

6.6

Overall

7.4

Reviews

1 / 20
4.0
Okay

Tim,Sep 2025

IAD - GSP

This was pretty bad. It’s chaos at the Dulles boarding gates for the small regional jets because they use one gate to board 3-4 flights at a time. So, it’s difficult knowing where and when to go. There is little space for any size of carrry-on, so most had to gate check their bags. However, the worst of it was that our single flight attendant fell asleep before we took off and the pilot couldn’t do so until she responded to his messages. My wife had to wake her up! So we were a little late leaving. Not to be thwarted, the flight attendant fell asleep right after take off and there was no sight of her during the flight. When the aircraft touched down, a tray of unsecured canned drinks came crashing onto the aisle up front. I can only assume someone didn’t do what they were supposed to. The pilot was great, but I’m sure he must not be happy with this crew member.
Iberia
7.0
Good
2,996 reviews
United Airlines
7.4
Good
8,991 reviews

Comfort

7.3

Boarding

7.7

Crew

8.1

Entertainment

7.1

Food

6.6

Overall

7.4

Reviews

1 / 20
4.0
Okay

Tim,Sep 2025

IAD - GSP

This was pretty bad. It’s chaos at the Dulles boarding gates for the small regional jets because they use one gate to board 3-4 flights at a time. So, it’s difficult knowing where and when to go. There is little space for any size of carrry-on, so most had to gate check their bags. However, the worst of it was that our single flight attendant fell asleep before we took off and the pilot couldn’t do so until she responded to his messages. My wife had to wake her up! So we were a little late leaving. Not to be thwarted, the flight attendant fell asleep right after take off and there was no sight of her during the flight. When the aircraft touched down, a tray of unsecured canned drinks came crashing onto the aisle up front. I can only assume someone didn’t do what they were supposed to. The pilot was great, but I’m sure he must not be happy with this crew member.
Lufthansa
6.8
Okay
7,508 reviews
United Airlines
7.4
Good
8,991 reviews

Comfort

7.3

Boarding

7.7

Crew

8.1

Entertainment

7.1

Food

6.6

Overall

7.4

Reviews

1 / 20
4.0
Okay

Tim,Sep 2025

IAD - GSP

This was pretty bad. It’s chaos at the Dulles boarding gates for the small regional jets because they use one gate to board 3-4 flights at a time. So, it’s difficult knowing where and when to go. There is little space for any size of carrry-on, so most had to gate check their bags. However, the worst of it was that our single flight attendant fell asleep before we took off and the pilot couldn’t do so until she responded to his messages. My wife had to wake her up! So we were a little late leaving. Not to be thwarted, the flight attendant fell asleep right after take off and there was no sight of her during the flight. When the aircraft touched down, a tray of unsecured canned drinks came crashing onto the aisle up front. I can only assume someone didn’t do what they were supposed to. The pilot was great, but I’m sure he must not be happy with this crew member.

Related info for your journey

Find useful and relevant information for your journey from Chicago to Bilbao. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to Bilbao from Chicago?

    Bilbao (BIO) is the airport you will fly into if you book a flight from Chicago to Bilbao. You should not have trouble finding flights to Bilbao from Chicago; the airport handles an average of 0 inbound flights from Chicago per day. You should also have plenty of airline options to choose from since 3 airlines have flights to the Bilbao airport from Chicago. It is only a 3.0 mi journey from Bilbao (BIO) to Bilbao’s city center.

  • How long is the flight from Chicago to Bilbao?

    Airlines like United Airlines, Delta, and KLM fly from Chicago to Bilbao in about 15h 15m. The time it takes to get you to your destination can typically vary by up to 2h 39m. Chicago and Bilbao are separated by a distance of 4116 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • What are the cheapest airlines flying from Chicago to Bilbao round-trip?

    Cheapflights users have booked flights from Chicago to Bilbao round-trip from $612. Other airlines that can offer you cheap pricing are United Airlines, from $639, and Lufthansa, from $698. Iberia is 36% cheaper than the average price of flights available within the next 90 days to this destination.

  • Can I find deals for flights from Chicago to Bilbao that include hotel bookings?

    Yes. In addition to deals on Chicago to Bilbao flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Chicago to Bilbao?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Chicago to Bilbao.

  • Can I find deals for business class flights from Chicago to Bilbao?

    Yes. Cheapflights offers flight deals from Chicago to Bilbao by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Chicago to Bilbao?

    Currently, August is the cheapest month in which you can book a flight from Chicago to Bilbao (average of $547). Flying from Chicago to Bilbao in July is currently the most expensive (average of $871). 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.

See more FAQs

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Alternative routes for Chicago to Bilbao

See prices for flight routes from nearby airports that may be better suited for you.
O'Hare Intl to Bilbao flights
O'Hare Intl to San Sebastian flights
Midway to Bilbao flights
St. Louis to Bilbao flights
St. Louis to San Sebastian flights

Top 3 airlines flying from Chicago to Bilbao

Discover the top 3 airlines that operate flights from Chicago to Bilbao. 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 October 20, 2025.
AirlineCheapestAverageFlexibilityOn-time
IberiaCheapest$612Average$864FlexibilityNo cancel feeOn-time77%
United AirlinesCheapest$639Average$887FlexibilityNo cancel feeOn-time69%
LufthansaCheapest$698Average$881FlexibilityNo cancel feeOn-time76%

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