IAD - BIO

$324 Find Cheap Flights from Washington Dulles Airport 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 Dulles Intl to Bilbao departing on 12/12. 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, 0 bags

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 Washington, D.C. 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 Washington, D.C. to Bilbao, as well as popular online travel agencies
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Everything you should know

Cheapest round-trip
$467
TAP AIR PORTUGAL
Tue 12/9Wed 1/14
IAD - BIO • 1 stop
Cheapest one-way
$324
Multiple Airlines
Fri 12/12
IAD - BIO • 3 stops
Top airlines
Delta
Cheapest • from $491 (round-trip)
KLM
Best reviews • 7.7 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
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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!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Dulles Intl to Bilbao (IAD-BIO)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Dulles Intl 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 Dulles Intl to Bilbao

Tue, Dec 9 - Wed, Jan 14
TAP AIR PORTUGAL Logo
5:30 pm - 11:25 amIAD-BIO
11h 55m1 stop
TAP AIR PORTUGAL Logo
12:10 pm - 9:00 pmBIO-IAD
14h 50m1 stop
$467TAP AIR PORTUGAL
Find Deal
Tue, Dec 9 - Thu, Jan 15
Delta Logo
10:08 am - 11:20 amIAD-BIO
19h 12m2 stops
Delta Logo
6:50 am - 4:05 pmBIO-IAD
15h 15m1 stop
$481Delta
Find Deal
Tue, Dec 9 - Tue, Jan 13
Delta Logo
10:08 am - 11:20 amIAD-BIO
19h 12m2 stops
Delta Logo
7:25 am - 4:35 pmBIO-IAD
15h 10m1 stop
$487Delta
Find Deal
Tue, Dec 9 - Thu, Jan 15
Delta Logo
10:08 am - 11:20 amIAD-BIO
19h 12m2 stops
Delta Logo
6:50 am - 8:37 pmBIO-IAD
19h 47m2 stops
$491Delta
Find Deal
Tue, Dec 9 - Tue, Jan 13
Delta Logo
10:08 am - 11:20 amIAD-BIO
19h 12m2 stops
Delta Logo
7:25 am - 7:09 pmBIO-IAD
17h 44m2 stops
$497Delta
Find Deal
Tue, Dec 9 - Wed, Jan 14
Delta Logo
10:08 am - 11:20 amIAD-BIO
19h 12m2 stops
Delta Logo
12:15 pm - 4:35 pmBIO-IAD
34h 20m1 stop
$500Delta
Find Deal
Mon, Dec 8 - Fri, Jan 16
Lufthansa Logo
10:55 pm - 12:05 pmIAD-BIO
31h 10m2 stops
Lufthansa Logo
6:45 am - 3:50 pmBIO-IAD
15h 05m1 stop
$515Lufthansa
Find Deal
Tue, Dec 9 - Fri, Jan 16
TAP AIR PORTUGAL Logo
5:30 pm - 11:25 amIAD-BIO
11h 55m1 stop
TAP AIR PORTUGAL Logo
6:40 pm - 3:15 pmBIO-IAD
26h 35m1 stop
$517TAP AIR PORTUGAL
Find Deal
Tue, Dec 9 - Mon, Jan 12
TAP AIR PORTUGAL Logo
5:30 pm - 11:25 amIAD-BIO
11h 55m1 stop
TAP AIR PORTUGAL Logo
7:20 pm - 2:35 pmBIO-IAD
25h 15m1 stop
$521TAP AIR PORTUGAL
Find Deal
Mon, May 4 - Thu, May 21
Lufthansa Logo
10:20 pm - 5:50 pmIAD-BIO
13h 30m1 stop
Lufthansa Logo
6:45 am - 3:15 pmBIO-IAD
14h 30m1 stop
$522Lufthansa
Find Deal
Booking Insights

KAYAK's insights & trends for Dulles Intl to Bilbao flights

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

What’s the cheapest day of the week to fly from Washington Dulles Airport to Bilbao?

The average price of all round-trip flights from Washington, D.C. Dulles Intl Airport to Bilbao clicked on KAYAK for each day over the last 12 months.

For Washington Dulles Airport to Bilbao, Monday is the cheapest day to fly on average and Saturday is the most expensive. Flying from Bilbao back to Washington Dulles Airport, the best deals are generally found on Saturday, with Friday being the most expensive.

Good to know

Low seasonSeptember
Cheapest flight$324
Best time to beat the crowds with an average 26% drop in price.
Most popular time to fly with an average 25% increase in price.
Flight from Washington Dulles Airport to Bilbao

When to book flights from Dulles Intl to Bilbao

Are your dates flexible? Find out the best times to travel from Dulles Intl 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 Washington Dulles Airport to Bilbao flights

  • What is the cheapest flight from Washington, D.C. Dulles Intl Airport to Bilbao?

    In the last 3 days, the lowest price for a flight from Washington, D.C. Dulles Intl Airport to Bilbao was $324 for a one-way ticket and $467 for a round-trip.

  • Do I need a passport to fly between Washington Dulles Airport and Bilbao?

    Yes, you’ll need a passport to travel to Bilbao from Washington Dulles Airport.

  • Which aircraft models fly most regularly from Washington Dulles Airport to Bilbao?

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

  • Which airline alliances offer flights from Washington Dulles Airport to Bilbao?

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

  • Which is the best airline for flights from Washington, D.C. to Bilbao, KLM or United Airlines?

    The two airlines most popular with KAYAK users for flights from Washington, D.C. to Bilbao are KLM and United Airlines. With an average price for the route of $750 and an overall rating of 7.7, KLM is the most popular choice. United Airlines is also a great choice for the route, with an average price of $688 and an overall rating of 7.4.

  • How does KAYAK find such low prices on flights from Washington Dulles Airport 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 Washington Dulles Airport to Bilbao.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Bilbao from Washington Dulles Airport 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 Washington Dulles Airport 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 Washington Dulles Airport with another airline. Booking your flights between Washington Dulles Airport 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 Washington Dulles Airport 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 Washington Dulles Airport up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top 4 airlines serving from Dulles Intl to Bilbao

 
See real verified KAYAK customer reviews for airlines flying from Washington, D.C. 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 Dulles Intl 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.
7.7
KLMOverall score based on 1411 reviews
7.7Comfort
7.1Entertainment
7.8Boarding
8.4Crew
7.3Food
Airline reviews

They forgot to serve food and the crew was very unfriendly. Never experienced such a bad KLM flight. Usually fly from Toronto. New York was different.

4.0 OkayMarcel, Oct 2025JFK - AMS
Read more KLM reviews

They forgot to serve food and the crew was very unfriendly. Never experienced such a bad KLM flight. Usually fly from Toronto. New York was different.

The immigration hall in Amsterdam was understaffed, so passport checking was slower than it should be for a major airport. They need to get the automatic readers up and running for non EU passport holders. Waiting in line after a long flight feels a bit abusive.

Over 1 Hr delay. No APU so no AC on ground. Plane was hot during boarding and then they closed the doors over 20 minutes before engine start so interior of plane was steamy hot and stuffy. Could have been helped by opening doors until ready to depart.

Ad experience - been flying many years with them but they are losing out to other carriers with their service and bagage / seating policy. My 2 12-yo kids were not placed with the parent. Absurdity.

Short flight so it was okay. Nice crew, all very pleasant and professional. We were near the back in row 27 so just as we got our drinks, we started our descent so had to drink very quickly!

KLM remains a quality flag carrier airline which maintains its standards whilst all their competitors are lowering theirs.

The baggage drop-off in Stuttgart is bad: after online check-in you cannot use the automated baggage drop off as indicated on the website. You can use the terminals but have to cue to 1 of three open and slowly working counters to drop the bags. took about 45 minutes wait time.

My flight was delayed by 6 hours then I missed BOTH of my connecting flights, I then had to stay in the AIRPORT at JFK because soooooo many people also suffered from missing flights and there was no hotels available. I would like to be compensated for this experience! I had to stay in the airport for over 16 hours!

Klm start boarding while somw air issue in the plan

I appreciate that KLM was proactive in informing me of the 2 hour delay which enabled me to replan my travel. It was a bit stressful not knowing whether my connection from Montreal to Ottawa was happening. But the ground and air crew did a good job at comforting and assuring me.

Starlink wifi on the Embraer E175 is an excellent experience. I was able to connect and work from IAD all the way to approach into BTV.

7 hours delayed due to operational issues on United’s end. Basically laziness.

Short flight but an "eager to help" crew made the journey more enjoyable!

During booking, I kept trying submitting my payment from the Mexican website and it didn't work. After I had the idea to change it to the Canadian website, it worked but I had to be charged the equivalent of 50 CAD more. I received the clear instruction that I would only be able to check-in at the airport and that it was impossible to select a seat 24 hours before departure, that I had to pay 144 CAD to do so, although not only was I able to check-in 24 hours before departure, but I could have selected my seats for free then. All in all, I almost threw $200 out the window due to misleading information. Besides, the app kept crashing, the information to get to the gate on the app was inaccurate, my gate was switched and I was only informed once in the air (luckily I had noticed the departure pannel), I was not addressed in my language beforehand and even if I tried I was immediately answered in English (which meant the crew understood but didn't want to answer accordingly), there was only one snack & beverage service on my medium haul flight and no beverage service on my short haul flight. To be fair, the planes were comfortable, the crew apart from the language issue was helpful, dynamic and engaging, the plane was clean and the directions were clear and direct. United has a lot of potential to be one of my favourite airlines, but the devil is in the details and a lot of them missed the target.

Better WiFi. I cannot understand that in 2025, United is so behind on a technology that is now a necessity and still painfully unreliable, slow and keeps disconnecting.

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

Very small cramped plane for an international flight. Everything else was good, but it was maybe the smallest comfort-wise I've ever been on for longer than 3-4 hours and the trip was 7.5

Flight was delayed 3 hours. No food and drink vouchers was provided. They offered a mini pretzel bag and water .

Staff was rude. Didn’t give water for 2 hours. Worst service

Was on time until within 1 hour of flight-how does that happen? Staff very friendly.

The staff was very nice and helpful. Some of the best crew I have met.

Bad experience. The seat room are very tight. The food is not good and the breakfast has no hot drink.

Suddenly, I don't find my flight back on the app Help Ticket 0757345716866 Hoeflich Flight back Sunday ib5333 Ib2629 Ib4268

Great : The crew was awesome ♥️ To improve : - The rice in the "Rice with chicken" was rather s kind of rice pudding, not good at all - No power outlet to charge your phone. 😒

It was a good flight overall. Nothing to add. Keep it up!

Excellent. Thanks to United Star Alliance, since economy was overbooked, I’m grateful to have been upgraded to Business Class.

Good plane, excellent food, crew and entertainment. Seats in business could use an upgrade

Delayed. Mismanagement of gate lines. Passengers arguing with eachother as a result of lack of organization by airline. Avoid this airline.

Disaster. Downgraded. Zero apology. No effort or coordination between gate and crew. Awful seat blocked by door emergency slide box. Iberia is a mess. App never works. Avoid this airline.

We departed late but made up most of the time in flight. Our ticket was pure economy, so it wasn’t anything fancy; however, I heard that we arrived in Madrid at the exact same time that First Class passengers arrived! Overall, our experience was similar to what we had on other American Airlines transatlantic flights - good value at a reasonable price. We were even able to get our carry-on baggage onto the plane without needing to gate check it.

Trip was smooth, good drew, average meal, almost cold coffee. Excellent landing. Did not enjoy going down the stairs, walking to the gate, walking up the stairs, going a long walk to the exchange gate, and going down the stairs again to be bussed all the way where we originally landed to take our next flight! Over all an average experience. Thank you.

I booked extra leg room, due to seat neighbor i now consider extra shoulder and arm room as well. Seems like the seats shrink in width now The crew was very friendly and professional ( 100%). Food was good not great, breakfast was bad, a dry slice of bread would have been better. Facilities clean.

Luggage transfer in Chicago was not performed in time. I received my luggage at my destination two days later.

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.

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!

Our flight was delayed for over an hour due to weather, and it had already been a long travel day. However, the crew was calm and compassionate, listening to every complaint with genuine concern. They got us home safely without incident, in spite of all of the obstacles. I’m grateful.

Bad! Disaster!! The LH419 was cancelled after 4 hrs on board with no AC and no toilets

We had almost a 6 hr delay, primarily due to weather, the e problem was that they communicated this delay and its length very poorly. The boarding was chaotic - even though they had hours to figure it out! The plane was an old 747 whose touch screens barely worked and there was a faulty USB port under my seat rest (something that wasn't labeled as being there) They organized my delayed luggage well. And I could get updates on the Lufthansa website. My shirt connecting flight charged for everything except water. Coffee was over 3€

We were charged for luggage, and our ticket was with Lufthansa and was supposed to include luggage fees. So our experience was a bit bad. Also, the flight was about 45 minutes late arriving.

Everything you need to know for your flight from Dulles Intl to Bilbao

Information on your arrival and departure airports