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$477+ Cheap flights from Philadelphia (PHL) 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 8/22. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — BIO
Jul 8 — Jul 151
Tue 7/8
Tue 7/15
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 July 3, 2025.

Round-trip from

$591
(Iberia)

One-way from

$477
(Kiwi.com)

Popular in

November

Cheapest in

January

Average price

$947
From Philadelphia to Bilbao
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One-way flight from Philadelphia to Bilbao
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Highest demand for flights based on searches. 11% potential increase in price ($111 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($34 potential savings vs. average RT price).
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Average for round-trip flights in July 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 July 3, 2025.

This Iberia deal was found by Cheapflights users on 7/3. 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 Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/38:00 pmPHL - BIO
1 stop14h 55mIberia
Wed 11/129:15 amBIO - PHL
1 stop12h 20mIberia
Deal found 7/3$491

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 July 3, 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 9/11

8:25 pm-4:55 pm

1 stop14h 30m

Bilbao

Mon 9/22

9:35 pm-3:55 pm

1 stop24h 20m

$591

PhiladelphiaBilbao

PHL - BIO

PHLBIO

Philadelphia

Fri 9/19

10:15 pm-8:30 am

2 stops28h 15m

Bilbao

Sat 9/27

5:35 pm-1:05 pm

2 stops25h 30m

$632

PhiladelphiaBilbao

PHL - BIO

PHLBIO

Philadelphia

Thu 9/11

1:50 pm-8:30 am

2 stops12h 40m

Bilbao

Sun 9/21

9:15 am-9:45 pm

2 stops18h 30m

$645

PhiladelphiaBilbao

PHL - BIO

PHLBIO

Philadelphia

Mon 9/22

5:35 pm-1:20 pm

1 stop13h 45m

Bilbao

Sun 9/28

2:10 pm-4:00 pm

1 stop31h 50m

$665

PhiladelphiaBilbao

PHL - BIO

PHLBIO

Philadelphia

Thu 9/11

5:35 pm-6:20 pm

1 stop18h 45m

Bilbao

Mon 9/22

7:10 pm-4:00 pm

1 stop26h 50m

$765

PhiladelphiaBilbao

PHL - BIO

PHLBIO

Philadelphia

Fri 9/19

6:50 pm-5:30 pm

1 stop16h 40m

Bilbao

Sat 9/27

6:10 pm-11:45 am

1 stop23h 35m

$803

PhiladelphiaBilbao

PHL - BIO

PHLBIO

Philadelphia

Mon 9/22

6:30 pm-11:15 pm

2 stops22h 45m

Bilbao

Sun 9/28

9:15 am-9:24 pm

2 stops18h 09m

$1,128

PhiladelphiaBilbao

PHL - BIO

PHLBIO

Philadelphia

Fri 9/19

5:35 pm-1:00 pm

2 stops37h 25m

Bilbao

Sat 9/27

12:10 pm-6:57 pm

3 stops36h 47m

$2,084

PhiladelphiaBilbao

PHL - BIO

PHLBIO

Philadelphia

Fri 8/22

10:47 am-5:30 pm

3 stops24h 43m

$477

PhiladelphiaBilbao

PHL - BIO

PHLBIO

Philadelphia

Fri 8/22

8:30 pm-5:30 pm

1 stop15h 00m

$539

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/2

Showing 1-10 of 14 results
1
2

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 $1,142). 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 July 3, 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 July 3, 2025.
See what other customers who have flown with United Airlines, Brussels Airlines, and American Airlines 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
8,861 reviews

Entertainment

7.0

Crew

8.1

Food

6.6

Comfort

7.3

Boarding

7.7

Overall

7.4

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
8,861 reviews
United Airlines
7.4
Good
8,861 reviews

Entertainment

7.0

Crew

8.1

Food

6.6

Comfort

7.3

Boarding

7.7

Overall

7.4

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??
Brussels Airlines
7.3
Good
352 reviews
United Airlines
7.4
Good
8,861 reviews

Entertainment

7.0

Crew

8.1

Food

6.6

Comfort

7.3

Boarding

7.7

Overall

7.4

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??
American Airlines
7.2
Good
10,000 reviews
United Airlines
7.4
Good
8,861 reviews

Entertainment

7.0

Crew

8.1

Food

6.6

Comfort

7.3

Boarding

7.7

Overall

7.4

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??
Aer Lingus
7.1
Good
1,144 reviews
United Airlines
7.4
Good
8,861 reviews

Entertainment

7.0

Crew

8.1

Food

6.6

Comfort

7.3

Boarding

7.7

Overall

7.4

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??
TAP AIR PORTUGAL
7.1
Good
1,908 reviews
United Airlines
7.4
Good
8,861 reviews

Entertainment

7.0

Crew

8.1

Food

6.6

Comfort

7.3

Boarding

7.7

Overall

7.4

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 $591, 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 American Airlines and United Airlines - these airlines can fly you to your destination from $645 and $665, respectively. Iberia is priced at 34% lower than the current average price of a flight leaving 3 months from now.

  • What are the cheapest airlines to fly from Philadelphia to Bilbao one-way?

    To fly one-way, consider booking your trip with Aer Lingus, which is currently one of the cheapest options available, starting at $539. American Airlines flights start at $559 while deals on TAP AIR PORTUGAL start at $607 one-way.

  • 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 $1,142). 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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Top 2 airlines flying from Philadelphia to Bilbao

Discover the top 2 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 July 3, 2025.
AirlineCheapestAverageFlexibilityOn-time
IberiaCheapest$496Average$1,021FlexibilityNo cancel feeOn-time77%
LufthansaCheapest$587Average$937FlexibilityNo cancel feeOn-time76%

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