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Bilbao

$635+ Cheap flights from Philadelphia (PHL) to Bilbao (BIO)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 9/18. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — BIO
Aug 23 — Aug 301
Sat 8/23
Sat 8/30
1 adult, Economy
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Cheap flight deals from Philadelphia to Bilbao

Discover tips and strategies to find the most affordable flight options for your journey from Philadelphia (PHL) 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 August 18, 2025.

Round-trip from

$635
(Cheapflightsfares)

Popular in

October

Cheapest in

January

Average price

$1,025
From Philadelphia to Bilbao
Search Deals
Highest demand for flights based on searches. 9% potential increase in price ($98 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($33 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in August 2025
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Find flight deals from Philadelphia to Bilbao

Cheapest flights from Philadelphia to Bilbao
Explore the most affordable flight options available from Philadelphia to Bilbao. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 18, 2025.

This Cheapflightsfares deal was found by Cheapflights users on 8/17. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/185:35 pmPHL - BIO
1 stop18h 45mLufthansa
Tue 9/236:45 amBIO - PHL
1 stop15h 15mLufthansa
Deal found 8/17$635
This United Airlines deal was found by Cheapflights users on 8/17. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/175:35 pmPHL - BIO
1 stop18h 45mUnited Airlines
Sun 9/216:45 amBIO - PHL
1 stop15h 15mUnited Airlines
Deal found 8/17$645
This Air Canada deal was found by Cheapflights users on 8/17. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/187:30 amPHL - BIO
2 stops23h 50mMultiple Airlines
Tue 9/236:45 amBIO - PHL
2 stops20h 53mMultiple Airlines
Deal found 8/17$651
This United deal was found by Cheapflights users on 8/17. 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 United is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/166:30 amPHL - BIO
2 stops22h 15mMultiple Airlines
Tue 9/236:45 amBIO - PHL
1 stop15h 15mMultiple Airlines
Deal found 8/17$663
This Cheapflightsfares deal was found by Cheapflights users on 8/17. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/165:35 pmPHL - BIO
1 stop13h 45mLufthansa
Tue 9/236:45 amBIO - PHL
1 stop15h 15mLufthansa
Deal found 8/17$664
This Kiwi.com deal was found by Cheapflights users on 8/16. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/155:35 pmPHL - BIO
1 stop13h 45mLufthansa
Sun 9/216:45 amBIO - PHL
1 stop15h 15mLufthansa
Deal found 8/16$694
This United deal was found by Cheapflights users on 8/16. 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 United is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/156:27 pmPHL - BIO
2 stops34h 18mMultiple Airlines
Sun 9/216:45 amBIO - PHL
1 stop15h 15mMultiple Airlines
Deal found 8/16$713
This United Airlines deal was found by Cheapflights users on 8/16. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/156:27 pmPHL - BIO
2 stops18h 18mUnited Airlines
Sun 9/2112:30 pmBIO - PHL
2 stops17h 51mUnited Airlines
Deal found 8/16$734
This United Airlines deal was found by Cheapflights users on 8/17. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/227:58 pmPHL - BIO
2 stops32h 47mUnited Airlines
Sun 9/282:10 pmBIO - PHL
1 stop31h 50mUnited Airlines
Deal found 8/17$748

Cheapflights Fare Finder

 
Customize your flight search to find flights from Philadelphia 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 August 18, 2025.
Use the filters below to find and compare flights from Philadelphia to Bilbao that are best for you.

Fly from

Philadelphia

Fly to

Bilbao

Route

Depart

Return

Price

PhiladelphiaBilbao

PHL - BIO

PHLBIO

Philadelphia

Thu 9/18

5:35 pm-6:20 pm

1 stop18h 45m

Bilbao

Tue 9/23

6:45 am-4:00 pm

1 stop15h 15m

$635

PhiladelphiaBilbao

PHL - BIO

PHLBIO

Philadelphia

Wed 9/17

5:35 pm-6:20 pm

1 stop18h 45m

Bilbao

Sun 9/21

6:45 am-4:00 pm

1 stop15h 15m

$645

PhiladelphiaBilbao

PHL - BIO

PHLBIO

Philadelphia

Thu 9/18

7:30 am-1:20 pm

2 stops23h 50m

Bilbao

Tue 9/23

6:45 am-9:38 pm

2 stops20h 53m

$651

PhiladelphiaBilbao

PHL - BIO

PHLBIO

Philadelphia

Thu 9/18

7:30 am-1:20 pm

2 stops23h 50m

Bilbao

Tue 9/23

6:45 am-9:38 pm

2 stops20h 53m

$651

PhiladelphiaBilbao

PHL - BIO

PHLBIO

Philadelphia

Tue 9/16

6:30 am-10:45 am

2 stops22h 15m

Bilbao

Tue 9/23

6:45 am-4:00 pm

1 stop15h 15m

$663

PhiladelphiaBilbao

PHL - BIO

PHLBIO

Philadelphia

Tue 9/16

5:35 pm-1:20 pm

1 stop13h 45m

Bilbao

Tue 9/23

6:45 am-4:00 pm

1 stop15h 15m

$664

PhiladelphiaBilbao

PHL - BIO

PHLBIO

Philadelphia

Mon 9/15

5:35 pm-1:20 pm

1 stop13h 45m

Bilbao

Sun 9/21

6:45 am-4:00 pm

1 stop15h 15m

$694

PhiladelphiaBilbao

PHL - BIO

PHLBIO

Philadelphia

Mon 9/15

6:27 pm-10:45 am

2 stops34h 18m

Bilbao

Sun 9/21

6:45 am-4:00 pm

1 stop15h 15m

$713

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/17

Best time to book a flight from Philadelphia to Bilbao

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

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

Currently, January is the cheapest month in which you can book a flight from Philadelphia to Bilbao (average of $541). Flying from Philadelphia to Bilbao in June is currently the most expensive (average of $1,139). 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 PHL to BIO?

Find hourly flight availability from Philadelphia 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 August 18, 2025.

Unlike in the morning, when flights are generally more expensive, you can save up to 29% on flights from Philadelphia to Bilbao by exploring options for tickets in the afternoon.

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 August 18, 2025.
See what other customers who have flown with United Airlines, Iberia, and Lufthansa from Philadelphia 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
8,925 reviews

Boarding

7.7

Food

6.6

Crew

8.1

Overall

7.4

Comfort

7.3

Entertainment

7.1

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
United Airlines
7.4
Good
8,925 reviews
United Airlines
7.4
Good
8,925 reviews

Boarding

7.7

Food

6.6

Crew

8.1

Overall

7.4

Comfort

7.3

Entertainment

7.1

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
Iberia
7.0
Good
2,884 reviews
United Airlines
7.4
Good
8,925 reviews

Boarding

7.7

Food

6.6

Crew

8.1

Overall

7.4

Comfort

7.3

Entertainment

7.1

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
Lufthansa
6.8
Okay
7,330 reviews
United Airlines
7.4
Good
8,925 reviews

Boarding

7.7

Food

6.6

Crew

8.1

Overall

7.4

Comfort

7.3

Entertainment

7.1

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??

Related info for your journey

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

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

    Currently priced at $580, Iberia will fly you from Philadelphia to Bilbao and back. In addition to Iberia, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Lufthansa and United Airlines - these airlines can fly you to your destination from $587 and $685, respectively. Iberia is priced at 35% lower than the current average price of a flight leaving 3 months from now.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Philadelphia 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 Philadelphia to Bilbao?

    Currently, January is the cheapest month in which you can book a flight from Philadelphia to Bilbao (average of $541). Flying from Philadelphia to Bilbao in June is currently the most expensive (average of $1,139). 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

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.

Top 3 airlines flying from Philadelphia to Bilbao

Discover the top 3 airlines that operate flights from Philadelphia 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 August 18, 2025.
AirlineCheapestAverageFlexibilityOn-time
IberiaCheapest$580Average$1,009FlexibilityNo cancel feeOn-time77%
LufthansaCheapest$587Average$930FlexibilityNo cancel feeOn-time76%
United AirlinesCheapest$685Average$1,065FlexibilityNo cancel feeOn-time69%

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