IAD - BIO

$342 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 8/11. 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
Travelers love KAYAK
41,299,237 searches in the past 7 days on KAYAK

Save 24% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

Bundle and saveSave money when you bundle your flight + hotel.

Filter your dealsChoose cabin class, free Wi-Fi and more.

Everything you should know

Cheapest round-trip
$701
Typical prices: $528-$516
Turkish Airlines
Sun 9/13Thu 9/24
IAD - BIO • 1 stop
Cheapest one-way
$342
Finnair
Tue 8/11
IAD - BIO • 1 stop
Top airlines
Cheapest • from $701 (round-trip)
Best reviews • 7.4 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Nonstop flights
Not available
There are currently no direct flights between Dulles Intl and Bilbao. You'll need at least 1 connection.
Insights
Insights
Insights
Insights
Top layover airports
Cheapest • Avg $647 (round-trip)
Shortest trip • 11h 05m (one-way)
Insights
Insights
Insights
Insights
When to travel
Cheapest • 50% price drop
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Start a new search
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

Sun, Sep 13 - Thu, Sep 24
Turkish Airlines Logo
9:45 pm - 11:10 am
IAD
-
BIO
31h 25m
1 stop
Turkish Airlines Logo
6:20 pm - 7:50 pm
BIO
-
IAD
31h 30m
1 stop
$701Turkish Airlines
Sun, Sep 13 - Thu, Sep 24
Turkish Airlines Logo
1:20 pm - 11:10 am
IAD
-
BIO
15h 50m
1 stop
Turkish Airlines Logo
6:20 pm - 11:35 am
BIO
-
IAD
23h 15m
1 stop
$705Turkish Airlines
Wed, Sep 9 - Fri, Sep 18
Turkish Airlines Logo
9:45 pm - 11:10 am
IAD
-
BIO
31h 25m
1 stop
Turkish Airlines Logo
12:10 pm - 11:35 am
BIO
-
IAD
29h 25m
1 stop
$716Turkish Airlines
Mon, Sep 7 - Mon, Sep 14
TAP AIR PORTUGAL Logo
10:35 pm - 6:00 pm
IAD
-
BIO
13h 25m
1 stop
TAP AIR PORTUGAL Logo
12:25 pm - 3:10 pm
BIO
-
IAD
32h 45m
1 stop
$717TAP AIR PORTUGAL
Mon, Sep 7 - Sun, Sep 13
TAP AIR PORTUGAL Logo
10:35 pm - 6:00 pm
IAD
-
BIO
13h 25m
1 stop
TAP AIR PORTUGAL Logo
7:45 pm - 3:10 pm
BIO
-
IAD
25h 25m
1 stop
$718TAP AIR PORTUGAL
Sun, Sep 6 - Tue, Sep 15
Turkish Airlines Logo
1:20 pm - 11:10 am
IAD
-
BIO
15h 50m
1 stop
Turkish Airlines Logo
12:10 pm - 11:35 am
BIO
-
IAD
29h 25m
1 stop
$720Turkish Airlines
Tue, Sep 8 - Sun, Sep 13
TAP AIR PORTUGAL Logo
10:35 pm - 11:30 am
IAD
-
BIO
30h 55m
1 stop
TAP AIR PORTUGAL Logo
7:45 pm - 3:10 pm
BIO
-
IAD
25h 25m
1 stop
$722TAP AIR PORTUGAL
Tue, Sep 8 - Tue, Sep 15
TAP AIR PORTUGAL Logo
10:35 pm - 11:30 am
IAD
-
BIO
30h 55m
1 stop
TAP AIR PORTUGAL Logo
6:50 pm - 3:10 pm
BIO
-
IAD
26h 20m
1 stop
$732TAP AIR PORTUGAL
Wed, Sep 9 - Wed, Sep 16
Turkish Airlines Logo
9:45 pm - 11:10 am
IAD
-
BIO
31h 25m
1 stop
Turkish Airlines Logo
6:20 pm - 11:35 am
BIO
-
IAD
23h 15m
1 stop
$733Turkish Airlines
Tue, Sep 8 - Wed, Sep 16
TAP AIR PORTUGAL Logo
10:35 pm - 11:30 am
IAD
-
BIO
30h 55m
1 stop
TAP AIR PORTUGAL Logo
12:25 pm - 8:35 pm
BIO
-
IAD
14h 10m
1 stop
$737TAP AIR PORTUGAL
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.

How much is a round-trip flight from Washington, D.C. Dulles Intl Airport to Bilbao?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Washington, D.C. Dulles Intl Airport to Bilbao departing in September.

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Washington, D.C. Dulles Intl Airport to Bilbao, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Washington, D.C. Dulles Intl Airport to Bilbao is January, where tickets cost $364 (return) on average. On the other hand, the most expensive months are June and May, where the average cost of round-trip tickets is $1,026 and $976 respectively.

Good to know

Low seasonJanuary
Cheapest flight$342
Best time to beat the crowds with an average 50% drop in price.
Most popular time to fly with an average 6% 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 $342 for a one-way ticket and $701 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?

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

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

    The two airlines most popular with KAYAK users for flights from Washington, D.C. to Bilbao are United Airlines and TAP AIR PORTUGAL. With an average price for the route of $681 and an overall rating of 7.4, United Airlines is the most popular choice. TAP AIR PORTUGAL is also a great choice for the route, with an average price of $815 and an overall rating of 7.2.

  • 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.
7.4
United AirlinesOverall score based on 9701 reviews
7.3Comfort
8.1Crew
7.7Boarding
6.6Food
7.1Entertainment
Airline reviews

WiFi didn’t exist , seats were super cramped, lights stayed on near my seat for a long time while others were dimmed, the food/trash/drink cart hit my shoulder at least a couple of times while moving, food options were down to just one option by the time it got to my row, the utensils were garbage (knife bent at a couple of places by the time I was done eating) the spoon was very flimsy plastic

4.0 OkayManoj, May 2026
IAD - BRU
Read more United Airlines reviews

WiFi didn’t exist , seats were super cramped, lights stayed on near my seat for a long time while others were dimmed, the food/trash/drink cart hit my shoulder at least a couple of times while moving, food options were down to just one option by the time it got to my row, the utensils were garbage (knife bent at a couple of places by the time I was done eating) the spoon was very flimsy plastic

Vegetarian selection could be better. Bread was too hard to chew.

Crew was friendly and competent. Food, wine, and entertainment were excellent except the raw tuna on the flight to Split. Recommend against serving that - at least as the only option. Many medical conditions do not allow people to eat raw fish.

United didn’t even try to hold the flight for me. They knew I had a tight connection and when I arrived at the gate less than 10 mins after final boarding the flight had already gone. The gate agent wasn’t even notified that I was on my way. She was told I wasn’t at the airport

Good quick flight on a small but comfortable plane. I'm 6'3 and had plenty of space.

The flight was delayed so we were dead tired, and after that the turbulence was horrible. I was very scared.

Wifi took a while to kick in and we had a maintenance issue that took over 40 mins at the gate in Washington before pulling back

Very good. Because of the delays with my previous flight, I missed my connection, but I was able to book another flight through the United app easily.

Was happy we finally got upgraded in 1st class. The seat getting old. The cushiness need some improvement.

Ineffective communication with United resulted in lost baggage. Their Baggage Tracing counter at MUC was shut down from 11:00-14:15 on my arrival. Undertrained, underinformed staff had me Running all over MUC to find someone to help me to no avail. Staff was rude, unhelpful, and unable to effectively use the systems they did have operational. They refused to contact United in any way or provide any accommodation or other resources while I waited for my luggage. This has destroyed my downstream itinerary. If they had even the slightest visibility I may have been able to reschedule/plan, but again, their staff provided nothing, and did nothing more than their website, which doesn’t even work on a standard phone browser. Miserable failure at all levels that weren’t associated with the operation of the aircraft.

Flight attendants in business class were rather indifferent While in second leg operated by Portugalia TAP subsidiary were outstanfy

The chicken was so dry it was impossible to eat. No substitute was offered. The port to charge my phone was broken and all I got was a shrug from the crew. The entertainment system was glitchy and subtitles didn’t load. Crew seemed fully uninterested and unfriendly.

The flight crew were absolute rock stars. When they came to the gate they looked like royalty, so chic. They also were extremely kind. Food was good and I loved the lack of plastic waste. The flight was lovely and smooth.

We were unable to check in due to technical problems on TAP’s end. The flight was delayed forty minutes with no reason given. We received timely notice of the flight delay. We were also notified of a gate change. The new gate was at a different terminal. When we got to the new terminal, we learned that we had to go back to the old terminal first to check in. This information should have been included along with the gate change notification. Also unexplained, the steward skipped us when offering breakfast.

Horrible experience at tbe check in ladie she was very racist ,she doesn't speak portuguese too and forced me to check in my carrion bag and I saw everyone with carrion bag inside anda lot of space ,she was rude unprofessional

Absolutely unacceptable level of service for a Business class: lousy drink and food options, disgusting food (inedible meat, watery rice, etc...), pathetic level of attentiveness from staff, Business class restrooms were not accessible for long periods because blocked of by staff...overall extremely disappointing, will NEVER fly Business on TAP again.

First time flying Business with Tap, I think it was a very good experience. It beats many domestic US carriers, the food options were really great, authentic Portuguese food, wines & deserts. Next time will do the free 24-48 hour stopover in Lisbon or Porto for sure.

this flight was awful from pre-boarding to on the plane. There needs to be more coordination between TAP and My Way. We were in first class and I am handicapped. BY the time we got on the plane there was no place for our baggage and the crew did not handle the situation well. They gave us an argument and said that we'd have to have it checked. Then, after I complained they moved some people's bags to put our small carry ons several seats back of our seats which were in Row 4.

Late. Lack of updates. Rude hostesses. Terrible food. Lack of headphones.

Negative. Food was awful, seat broken, flight was late, baggage lost and damaged

I’m an Iberia fan but this time They dropped the ball. I went from ALC to MAD to LHR. Boarding in ALC was by group… to get you in a bus. Then we sat for almost an hour when most people had connections. When we landed in Madrid we did so and they put us in another bus almost like if they wanted to make people lose their connection. We made ours by the skin of our teeth but our luggage did not. And on top of this we had to listen to the pilot bragging about Iberia being punctual. To be true we made it on time to LHR but we are Still waiting for our luggage

I have to compare it to the AA flight back home. AA was a little better. Perhaps it was that American English is my native tongue. My seat on AA was newer and more comfortable. The food was a little better. The entertainment was much better, more movies worth watching. The sound was lousy on both.

Excellent liked business class except wife’s luggage was lost on 10 Hours connecting flight to Miami and we were priority! 1:20 layover! Expect better From American Airlines partner

Service was good , communication and emails were in Spanish though I booked in English , end up figuring it out but also flight was partnered with air maroc and I had to call them to check on not Iberea doesn’t make sense

In general, I've had excellent experiences with Iberia flights and will continue to use them. In this last flight there were two things that didn't go right. I didn't get the kosher meal I had pre-requested when I had checked in on-line. Things worked out OK as we ended up eating the fish and vegetarian choices, which were really good. The other issue was that some movies for me and my wife started fine but after 8-12 minutes the content just switched to something else. The flight attendant reset our entertainment systems, but the problem persisted. We ended up choosing other movies/TV shows that did work fine.

Awful. They didn't even show concern that her connecting flight( Dallas to Mardrid) was gone/missing. I don't understand how that is even possible. Rudest answer from one of the crew was that American Airlines sold the tickets to somebody else. My daughter was not in the list.

The flight was canceled on a Thursday last minute. I lost thousands of dollars in hotels and car rental

Excellent lie flat seat for premium economy! Great staff. Bad food . Not so great entertainment. My bag didn’t make it either.

Really like the idea experience on this airline I will use again

The pilot was professional and very good. The flight crew, very young and often looked flustered and overwhelmed. The seats were among the most uncomfortable in the air. The boarding somewhat chaotic. The price reasonable. Overall it was an average budget airline experience...although Iberia is not a budget airline. I fear if Iberia doesn't up it's game customers like us will go elsewhere.

Definitely get premium economy on a flight this long if you can. Your legs and while body will thank you.

Flight was delayed by several hours and then cancelled due to weather. But Staff was very helpful getting me on a different flight. United should offer food coupons and tooth brush and paste for stranded passengers

Catastrophic experience the gate selected customers were picked up to.pay 70 eur for overweight 1-2 kg. While some others were let to board without chcking their carry on bags. Unecessaey drama by Lufthansa that brings nothing just hating them by customers.

Missed it by a couple minutes and couldn’t find an alternative flight so had to spend the night in DC and after much shuffling from 1 airline to another managed to get a United to Frankfurt.

There were only 2 toilets and one of them did not work in business class. We are not allowed to cross classes so had to wait in line to use the toilets!! The entertainment touch display was finicky and did not work all the time.

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

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

Information on your arrival and departure airports