PHL - BIO

$421 Find Cheap Flights from Philadelphia to Bilbao

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Philadelphia to Bilbao departing on 9/28. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy

KAYAK searches hundreds of travel sites at once for deals on flights to Bilbao

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Philadelphia to Bilbao, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Philadelphia to Bilbao, as well as popular online travel agencies
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Flight Deals

Cheap Flights from Philadelphia to Bilbao (PHL-BIO)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Philadelphia to Bilbao that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Philadelphia to Bilbao

Wed, Nov 26 - Mon, Dec 8
United Airlines Logo
6:31 pm - 6:05 pmPHL-BIO
17h 34m2 stops
United Airlines Logo
12:50 pm - 2:47 pmBIO-PHL
31h 57m2 stops
$516United Airlines
Find Deal
Thu, Oct 30 - Thu, Nov 6
Multiple Airlines Logo
9:00 pm - 12:50 pmPHL-BIO
10h 50m1 stop
Multiple Airlines Logo
6:45 am - 3:40 pmBIO-PHL
14h 55m1 stop
$541Multiple Airlines
Find Deal
Thu, Oct 30 - Thu, Nov 6
United Airlines Logo
8:00 pm - 6:05 pmPHL-BIO
17h 05m2 stops
United Airlines Logo
6:45 am - 4:05 pmBIO-PHL
15h 20m1 stop
$547United Airlines
Find Deal
Fri, Oct 24 - Fri, Oct 31
Multiple Airlines Logo
8:35 pm - 12:45 pmPHL-BIO
10h 10m1 stop
Multiple Airlines Logo
6:45 am - 9:50 pmBIO-PHL
20h 05m2 stops
$551Multiple Airlines
Find Deal
Thu, Oct 30 - Thu, Nov 6
United Airlines Logo
8:00 pm - 6:05 pmPHL-BIO
17h 05m2 stops
United Airlines Logo
12:50 pm - 10:56 pmBIO-PHL
16h 06m2 stops
$553United Airlines
Find Deal
Fri, Oct 24 - Fri, Oct 31
American Airlines Logo
6:08 pm - 12:45 pmPHL-BIO
12h 37m2 stops
American Airlines Logo
6:45 am - 9:50 pmBIO-PHL
20h 05m2 stops
$555American Airlines
Find Deal
Fri, Oct 24 - Fri, Oct 31
Multiple Airlines Logo
8:35 pm - 12:45 pmPHL-BIO
10h 10m1 stop
Multiple Airlines Logo
6:45 am - 4:40 pmBIO-PHL
14h 55m1 stop
$569Multiple Airlines
Find Deal
Sun, Oct 26 - Sun, Nov 2
Multiple Airlines Logo
6:08 pm - 11:15 pmPHL-BIO
24h 07m2 stops
Multiple Airlines Logo
9:35 pm - 3:40 pmBIO-PHL
24h 05m1 stop
$596Multiple Airlines
Find Deal
Thu, Oct 30 - Thu, Nov 6
Air Canada Logo
4:35 pm - 6:05 pmPHL-BIO
20h 30m2 stops
Air Canada Logo
6:45 am - 10:56 pmBIO-PHL
22h 11m3 stops
$598Air Canada
Find Deal
Wed, Nov 26 - Mon, Dec 8
United Airlines Logo
8:00 pm - 6:05 pmPHL-BIO
16h 05m2 stops
United Airlines Logo
6:45 am - 7:08 pmBIO-PHL
18h 23m3 stops
$599United Airlines
Find Deal

Everything you should know

Top airlines
United Airlines
Cheapest • from $516 (round-trip)
United Airlines
Best reviews • 7.4 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Cheapest round-trip
$516
United Airlines
Wed 11/26Mon 12/8
PHL - BIO • 2 stops
Cheapest one-way
$421
United Airlines
Sun 9/28
PHL - BIO • 1 stop
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KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Bilbao!
Booking Insights

KAYAK's insights & trends for Philadelphia to Bilbao flights

Get data-powered insights and trends into flights from Philadelphia to Bilbao to help you find the cheapest flights, the best time to fly and much more.

Which airlines provide the cheapest flights from Philadelphia to Bilbao?

The cheapest round-trip price for the route for each airline clicked by KAYAK users in the last 72 hours.

In the past 3 days, the cheapest round-trip tickets from Philadelphia to Bilbao were found on United Airlines ($516) and American Airlines ($555).

Good to know

Cheapest flight$421
Most popular time to fly with an average 5% increase in price.
Flight from Philadelphia to Bilbao

When to book flights from Philadelphia to Bilbao

Are your dates flexible? Find out the best times to travel from Philadelphia to Bilbao based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Philadelphia to Bilbao

  • What is the cheapest flight from Philadelphia to Bilbao?

    In the last 3 days, the lowest price for a flight from Philadelphia to Bilbao was $421 for a one-way ticket and $516 for a round-trip.

  • Do I need a passport to fly between Philadelphia and Bilbao?

    Yes, you’ll need a passport to travel to Bilbao from Philadelphia.

  • Which aircraft models fly most regularly from Philadelphia to Bilbao?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from Philadelphia to Bilbao?

    Star Alliance, and oneworld are the airline alliances operating flights between Philadelphia and Bilbao, with Star Alliance being the most commonly used for this route.

  • Which is the best airline for flights from Philadelphia to Bilbao, United Airlines or Iberia?

    The two airlines most popular with KAYAK users for flights from Philadelphia to Bilbao are United Airlines and Iberia. With an average price for the route of $1,065 and an overall rating of 7.4, United Airlines is the most popular choice. Iberia is also a great choice for the route, with an average price of $1,009 and an overall rating of 7.0.

  • How does KAYAK find such low prices on flights from Philadelphia to Bilbao?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Philadelphia to Bilbao.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Philadelphia to Bilbao?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Bilbao from Philadelphia is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Philadelphia to Bilbao?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Bilbao with an airline and back to Philadelphia with another airline. Booking your flights between Philadelphia and BIO can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Philadelphia to Bilbao?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Bilbao from Philadelphia up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top 3 airlines serving from Philadelphia to Bilbao

 
See real verified KAYAK customer reviews for airlines flying from Philadelphia to Bilbao. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Philadelphia to Bilbao? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.4
United AirlinesOverall score based on 8924 reviews
7.7Boarding
7.3Comfort
8.1Crew
7.1Entertainment
6.6Food
Airline reviews

We had to deboard 2 times due to maintenance issues. They changed the plane, and then we got deviated to LAX due to maibtenance issues on the other plane, had to sleep at LAX and los a full day.

2.0 MediocreAnonymous, Sep 2025SFO - MEX
Read more United Airlines reviews

We had to deboard 2 times due to maintenance issues. They changed the plane, and then we got deviated to LAX due to maibtenance issues on the other plane, had to sleep at LAX and los a full day.

Everything was good, except the seats in economy were so close together, you could barely get out when the seat in front of your was reclined. If the airlines keep jamming in more and more seats, it will become intolerable. I will look for another airline that considers customer comfort and does not keep adding more rows of seats for more profit.

The newer screen was super cool and had the option to watch many different shows or movies. Crew was polite and helpful. However again, many children screaming bloody murder and kicking my seat, and parents doing nothing about it as usual.

Flight was good and crew was super polite. However, there were around 5 kids screaming the WHOLE 2 hours. I understand kids have to come but parents need to do something to control their children. They make the experience terrible, especially after finishing 16 hour shifts at the hospital I needed some sleep, which I did not get.

IAD with the archaic people movers is just a place to be avoided.

Great service on board. Boarding a bit slow due to process. Food was pretty average.

Tastless food and too obvious lack of enthusiasm for service in the economy vesus business class

All of the United employees I interacted with were professional and courteous. The aircraft was clean, the food on the flight was good. No complaints here.

I had no checked baggage but was required to hand over carry on baggage at the door of the plane. There was a lot of overboard space in the plane and I was one of the last ones. I ran to get my carry on but it was gone. I was given back at the plane door in Toronto, so the wait was not as long as it would have been at the carousel.

Armrest controller on my seat 35D and nextbooennseat 35E did not work right. Hard to press buttons to recognize and 35D had constantnpressure either upmost down somit was nearly impossible to make selections. .

This is where i leave an airline review. Test test test!

We liked the flight but while we purchased an aisle seat, our seats had a different configuration on this flight. A fellow passenger suggested that the airplane had been changed. Too bad we were not informed and had no chance to modify our seat preferences. We were stuck in the window and middle seats with no chance to walk around and go to the bathroom without disturbing our sleeping fellow passenger.

Boarding an international flight via several sets of stairs and shuttle busses to the tarmac even when multiple jet-bridges were empty at Madrid airport (the hub for Iberia) was not pleasant. I was fine, but a lot of elderly folks and families with kids were struggling. A bad way to start a flight. Business class seats were nice, although not cleaned well from the prior flight.

This was a short flight. We sat in business class so we we were served a warm meal, which was nice. The flight attendants were very attentive, professional, and kind.

The flight was great; I don't see any area of improvement.

The crew were not very personable. The crew did not serve tea or coffee. The bathroom was not kept clean. Two out of the 5 toilets in the cabin weren't working.

Delayed first flight Geneva Madrid.. We didn’t miss our 2nd flight only because the 2nd flight Madrid Dallas was 1h delayed. However we did end up missing the 3rd leg Dallas Austin. Luggage didn’t show up in Dallas. So we re missing 2 suit cases. Customer service sent us to a hotel in Dallas. Only one room booked for 5!! Pretty bad experience overall. I won’t book a flight on Iberia in the future

Crew was excellent, great customer service, checked luggage took 1 hour and a half to come out at the baggage claim, the only negative thing about the flight.

Horrible experience airline crew was unprofessional. Flight was delayed. Suit cases did not arrive. Never flying iberia again

People point to America as the model of late stage capitalism. My friends, airlines in america at least give you WiFi, and they haven’t quite smashed people into cardboard tv dinner trays yet. Iberia has mastered the tv dinner seat and WiFi is 20 euros. Be serious yall.

I liked Quiet people around me. Crew could have helped people with overhead luggage so they aren't moving other peoples bags around and causing problems for people that had there bags there first

The flight and crew were good. The customer experience on the ground could have been better. We had to reschedule our flight because of a delay on the previous flight. The attendants working the desk in Washington DC were not helpful. They told us to scan a QR code and that would get us rebooked. Why couldn't two people standing at their computers do this? We had to chat with someone to get everything figured out. It was extremely confusing.

The plane was delayed by two hours in Chicago which led to us missing the next flight. Lufthansa rebooked the flight and booked us a hotel for the night in Frankfurt. The level of customer service and getting us taken care of was superb. The flight crew and the service on the ground was superb.

It was a short flight, everything was good with it.

Flight was delayed over one hour and I had to pay to select my seat, even though my booking supposedly had free selection (I paid extra for this at time of booking)

Stop charging for alcohol overseas flights and start taking cash again not everyone wants to pay with card if the person is bigger give him seat on the outside seats not the middle in between the people is common sense and mainly if you fly for Lufthansa provides the sam service and experience...

good entertainment package but rather small seats for business class

The male attendant has zero personality. It seemed like he was over worked or hated his job, not once did he smile or made any contact with the people on the plane. Strictly business and call it a day!

Booked Economy but it translated to economy light for Lufthansa so now we are stuck paying an extra $75 per person both ways for our checked bags. If I had known that, I would have never booked these tickets because it came out to be more than other options. The booking in the kayak side clearly says Economy and has a link to the inormation for Lufthansa which states Economy included a checked bag. Super annoyed about that.

The flight from Dulles to Munich was just okay. The seats were comfortable and extra foot room was noticeable in comfort plus. Disappointed in the booking in so much I requested an aisle seat and then was assigned a middle seat. The food was inedible. Movie choices were moderate. I usually fly Delta, but this WA flight was cheaper. Next time, I'll happily pay the extra to fly Delta.

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