IAD - BIO

$290 Find Cheap Flights from Washington Dulles Airport to Bilbao - Compare and Save

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 7/28. 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, 0 bags

Save 20% or more on flights. Compare deals from all over the web.

Never overpay with our price tracking tools.

Filter searches by price, airline and more to find your best flights.

Everything you should know

Cheapest round-trip
$575
Typical prices: $719-$811
TAP AIR PORTUGAL
Wed 10/14Sun 11/1
IAD - BIO • 1 stop
Cheapest one-way
$290
Multiple Airlines
Tue 7/28
IAD - BIO • 2 stops
Top airlines
Cheapest • from $570 (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 $636 (round-trip)
Shortest trip • 11h 17m (one-way)
Insights
Insights
Insights
Insights
When to travel
Cheapest • 100% 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

Wed, Oct 14 - Sun, Nov 1
TAP AIR PORTUGAL Logo
10:35 pm - 11:30 am
IAD
-
BIO
30h 55m
1 stop
TAP AIR PORTUGAL Logo
6:40 pm - 3:15 pm
BIO
-
IAD
26h 35m
1 stop
$575TAP AIR PORTUGAL
Mon, Aug 17 - Tue, Sep 1
TAP AIR PORTUGAL Logo
10:35 pm - 6:00 pm
IAD
-
BIO
13h 25m
1 stop
TAP AIR PORTUGAL Logo
6:50 pm - 3:10 pm
BIO
-
IAD
26h 20m
1 stop
$649TAP AIR PORTUGAL
Wed, Nov 25 - Tue, Dec 8
TAP AIR PORTUGAL Logo
10:30 pm - 5:55 pm
IAD
-
BIO
37h 25m
1 stop
TAP AIR PORTUGAL Logo
6:40 pm - 8:35 pm
BIO
-
IAD
31h 55m
1 stop
$652TAP AIR PORTUGAL
Sun, Aug 16 - Tue, Sep 1
TAP AIR PORTUGAL Logo
5:40 pm - 11:40 am
IAD
-
BIO
12h 00m
1 stop
TAP AIR PORTUGAL Logo
6:50 pm - 3:10 pm
BIO
-
IAD
26h 20m
1 stop
$670TAP AIR PORTUGAL
Mon, Aug 17 - Tue, Sep 1
TAP AIR PORTUGAL Logo
5:40 pm - 6:00 pm
IAD
-
BIO
18h 20m
1 stop
TAP AIR PORTUGAL Logo
6:50 pm - 3:10 pm
BIO
-
IAD
26h 20m
1 stop
$671TAP AIR PORTUGAL
Wed, Aug 19 - Thu, Sep 3
TAP AIR PORTUGAL Logo
10:35 pm - 11:30 am
IAD
-
BIO
30h 55m
1 stop
TAP AIR PORTUGAL Logo
12:15 pm - 8:35 pm
BIO
-
IAD
14h 20m
1 stop
$674TAP AIR PORTUGAL
Wed, Aug 19 - Wed, Aug 26
TAP AIR PORTUGAL Logo
5:45 pm - 11:30 am
IAD
-
BIO
11h 45m
1 stop
TAP AIR PORTUGAL Logo
12:25 pm - 3:10 pm
BIO
-
IAD
32h 45m
1 stop
$677TAP AIR PORTUGAL
Fri, Oct 9 - Sat, Oct 17
Royal Air Maroc Logo
9:00 pm - 7:35 pm
IAD
-
BIO
16h 35m
1 stop
Royal Air Maroc Logo
8:35 pm - 7:00 pm
BIO
-
IAD
28h 25m
1 stop
$679Royal Air Maroc
Mon, Aug 10 - Thu, Sep 3
TAP AIR PORTUGAL Logo
10:35 pm - 11:40 am
IAD
-
BIO
31h 05m
1 stop
TAP AIR PORTUGAL Logo
12:15 pm - 3:10 pm
BIO
-
IAD
32h 55m
1 stop
$681TAP AIR PORTUGAL
Sun, Aug 16 - Tue, Sep 1
TAP AIR PORTUGAL Logo
5:40 pm - 11:40 am
IAD
-
BIO
12h 00m
1 stop
TAP AIR PORTUGAL Logo
6:50 pm - 8:35 pm
BIO
-
IAD
31h 45m
1 stop
$686TAP 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 October.

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 February, where tickets cost $0 (return) on average. On the other hand, the most expensive months are June and May, where the average cost of round-trip tickets is $1,048 and $976 respectively.

Good to know

Cheapest flight$290
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 5 days, the lowest price for a flight from Washington, D.C. Dulles Intl Airport to Bilbao was $290 for a one-way ticket and $570 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 $816 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 9947 reviews
7.3Comfort
8.1Crew
7.1Entertainment
7.7Boarding
6.7Food
Airline reviews

Staff could’ve been a little more cordial. The men were much more friendlier than the women. My daughter and I also missed the 2nd to last meal as we were sleeping but that is on us.

8.0 ExcellentAmit, Jun 2026
IAD - CPT
Read more United Airlines reviews

Staff could’ve been a little more cordial. The men were much more friendlier than the women. My daughter and I also missed the 2nd to last meal as we were sleeping but that is on us.

Like: departed and arrived on time. Unlike: Food options for purchase allways bad, 1 of 2 of the crew members not very friendly at all. Seats and leg room aweful. At this point I am thinking on switching to AA.

Our flight was canceled same day and we were never informed. Had to pay more and worse seating on another airline.

Did not like that we couldn't complete check in on-line without providing pictures of our passports. Worry about identity theft. We had no delays and boarding was handled In an efficient manner.

Excellent! I got to Munich and was transferred to my Lufthansa flight quickly, in 15 to 20 minutes, so I did not miss my flight. However, I had checked my overhead bag at the boarding gate in Tampa. That got to Tunis the next day. That is to be expected.

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.

I flew Delta last week and United Airlines is a poor substitute mechanical problems with the plane and shitty food among other things made my travel experience what’s become to be expected from United no way is it ever worth the money they make us pay

No in flight entertainment, gate employees were very quick and impatient, plane was uncomfortable

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

Poor. Our flight was delayed and they told me I would be fine to make my connection in Lisbon, I missed it. Then they told me my bag would be automatically loaded onto my new flight to rome. It wasn’t. It’s been 4 days and I still don’t have it.

Plane was delayed, reading the gates on their screens was horrible. They posted it a half an hour before the plane boarded. By the time I got there with my premier boarding they have filled the plane because it was over booked. Gate closed at 12:03 I was there at 11:54 plane took over around 12:20. I was told they would put me on the next flight. I had to go to TAP information desk. They didn’t give me a voucher they just said they would put me on the next flight. At the desk I was told I had to punches a ticket. The woman said buy it online because it’s cheaper. It in fact was not cheaper. But I had gotten out of the long line that formed so I paid 200$ for a new ticket. At a later flight, not the next flight. I had checked my bag and was told it would be on my new flight. I was then bumped to an earlier flight and was told my bag would also be on my flight. After landing in Madrid loosing a day in my hotel i landed without my bag. They didn’t load it on any flight that day. It arrived in madrid the next day. Essentially ruining the first two days of my vacation. I’m now seeking compensation.

The person at the checkin was very helpful. We couldn’t check in through the keyosk, but the agent was very helpful.

The seats were not designed to comfortably see people in coach for more than 10 minutes

Checked bG chstgr was extremely high. Over $120. It was s bsit and switch knowing an international passenger would have t9 check a bag.

On time, politeness, food okay but entertneiment mediocre with only old movie and the so called new we’re 2 or 3…

Everything went very well. I would like to acknowledge the politeness and professionalism of the staff—they are superb. No complaints.

No legroom, have to pay for everything including water?!? Water is more expensive than beer?

We liked the crew. They were competent, professional and friendly. The only big negative was our departure was delayed several times and the airport staff did not communicate what the problems were and what we should expect.

The flight was operated by level, who had a sister’s check in procedure (2 hours) due to understaffing and a computer malfunction. While 3 agents stood at the business check in, with a total of maybe one actual customer there at a time, a huge line formed at economy check in with only 1 agent staffing the check in. Then, my luggage was lost - a guitar case with contents inside valued at 3,000 USD. The computer system of LEVEL could not locate my bag and had no record of it, and IBERIA (with whom I purchased my ticket and the checked bag) refused to help. It was a disastrous experience and I will never book Iberia again

Not bad but they lost 2 of my bags when I got to Florence

Couldn’t get boarding passes online, delayed an hour, and smallest amount of space on board I’ve ever encountered for such a long flight.

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.

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

online check-in was horrible and didn't work either way

I called prior to flying to confirm our baggage allowance which was 5 bags. On our outbound flight thee were no problems. On the return flight we were charged for each bag totaling $400! We are working with customer service to resolve the issue.

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

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€

It was good although we could not land in Munich due to weather and we had to go to Stuttgart. Missed our second flight. They did get us on another flight but the seats where not the ones I paid for in the flight that we missed.

In this flight was no good it was delay, change of door

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

Information on your arrival and departure airports