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Bilbao

$251+ Cheap flights from Dulles Intl (IAD) 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 11/8. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — BIO
Aug 21 — Aug 281
Thu 8/21
Thu 8/28
1 adult, Economy
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Cheap flight deals from Dulles Intl to Bilbao

Discover tips and strategies to find the most affordable flight options for your journey from Dulles Intl (IAD) 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 August 16, 2025.

Round-trip from

$440
(lol.travel)

One-way from

$251
(oojo)

Popular in

December

Cheapest in

September

Average price

$756
From Washington, D.C. Dulles Intl to Bilbao
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One-way flight from Washington, D.C. Dulles Intl to Bilbao
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Highest demand for flights based on searches. 19% potential increase in price ($184 potential increase over avg. RT price).
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Cheapest flight prices on average. 5% potential price decrease ($41 potential savings vs. average RT price).
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Average for round-trip flights in August 2025
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Find flight deals from Dulles Intl to Bilbao

Cheapest flights from Dulles Intl to Bilbao
Explore the most affordable flight options available from Dulles Intl to Bilbao. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 16, 2025.

This lol.travel deal was found by Cheapflights users on 8/15. 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 lol.travel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/55:45 pmIAD - BIO
1 stop11h 55mTAP AIR PORTUGAL
Tue 10/216:50 pmBIO - IAD
1 stop26h 30mTAP AIR PORTUGAL
Deal found 8/15$440
This Mytrip deal was found by Cheapflights users on 8/15. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/59:35 amIAD - BIO
2 stops24h 30mAir Canada
Tue 10/216:45 amBIO - IAD
2 stops20h 20mAir Canada
Deal found 8/15$467
This Mytrip deal was found by Cheapflights users on 8/15. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/59:35 amIAD - BIO
2 stops24h 30mMultiple Airlines
Tue 10/216:45 amBIO - IAD
1 stop12h 45mMultiple Airlines
Deal found 8/15$470
This Cheapflightsfares deal was found by Cheapflights users on 8/14. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/14:35 pmIAD - BIO
1 stop9h 55mIberia
Wed 10/229:15 amBIO - IAD
1 stop11h 45mIberia
Deal found 8/14$486
This Mytrip deal was found by Cheapflights users on 8/15. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/3010:20 pmIAD - BIO
1 stop19h 05mLufthansa
Tue 10/76:45 amBIO - IAD
1 stop15h 05mLufthansa
Deal found 8/15$487
This Cheapflightsfares deal was found by Cheapflights users on 8/15. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/110:20 pmIAD - BIO
1 stop19h 05mLufthansa
Wed 10/226:45 amBIO - IAD
1 stop15h 05mLufthansa
Deal found 8/15$490
This United Airlines deal was found by Cheapflights users on 8/15. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/2110:20 pmIAD - BIO
1 stop19h 05mUnited Airlines
Tue 9/306:45 amBIO - IAD
1 stop12h 45mUnited Airlines
Deal found 8/15$492
This Iberia deal was found by Cheapflights users on 8/14. 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.
Sun 10/54:35 pmIAD - BIO
1 stop9h 55mIberia
Tue 10/216:45 amBIO - IAD
1 stop14h 15mIberia
Deal found 8/14$493
This Air Canada deal was found by Cheapflights users on 8/14. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/11:00 pmIAD - BIO
2 stops18h 25mAir Canada
Wed 10/226:45 amBIO - IAD
2 stops20h 20mAir Canada
Deal found 8/14$496
This United deal was found by Cheapflights users on 8/15. 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 United is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/2210:32 pmIAD - BIO
1 stop30h 13mMultiple Airlines
Mon 9/292:10 pmBIO - IAD
1 stop31h 40mMultiple Airlines
Deal found 8/15$499
This United Airlines deal was found by Cheapflights users on 8/14. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/510:20 pmIAD - BIO
1 stop13h 30mUnited Airlines
Tue 10/216:45 amBIO - IAD
2 stops20h 26mUnited Airlines
Deal found 8/14$500

Cheapflights Fare Finder

 
Customize your flight search to find flights from Dulles Intl 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 August 16, 2025.
Use the filters below to find and compare flights from Washington, D.C. Dulles Intl Airport to Bilbao that are best for you.

Fly from

Dulles Intl

Fly to

Bilbao

Route

Depart

Return

Price

Washington, D.C.Bilbao

IAD - BIO

IADBIO

Washington, D.C. Dulles Intl

Sun 10/5

5:45 pm-11:40 am

1 stop11h 55m

Bilbao

Tue 10/21

6:50 pm-3:20 pm

1 stop26h 30m

$440

Washington, D.C.Bilbao

IAD - BIO

IADBIO

Washington, D.C. Dulles Intl

Sun 10/5

9:35 am-4:05 pm

2 stops24h 30m

Bilbao

Tue 10/21

6:45 am-9:05 pm

2 stops20h 20m

$467

Washington, D.C.Bilbao

IAD - BIO

IADBIO

Washington, D.C. Dulles Intl

Sun 10/5

9:35 am-4:05 pm

2 stops24h 30m

Bilbao

Tue 10/21

6:45 am-1:30 pm

1 stop12h 45m

$470

Washington, D.C.Bilbao

IAD - BIO

IADBIO

Washington, D.C. Dulles Intl

Wed 10/1

4:35 pm-8:30 am

1 stop9h 55m

Bilbao

Wed 10/22

9:15 am-3:00 pm

1 stop11h 45m

$486

Washington, D.C.Bilbao

IAD - BIO

IADBIO

Washington, D.C. Dulles Intl

Tue 9/30

10:20 pm-11:25 pm

1 stop19h 05m

Bilbao

Tue 10/7

6:45 am-3:50 pm

1 stop15h 05m

$487

Washington, D.C.Bilbao

IAD - BIO

IADBIO

Washington, D.C. Dulles Intl

Wed 10/1

10:20 pm-11:25 pm

1 stop19h 05m

Bilbao

Wed 10/22

6:45 am-3:50 pm

1 stop15h 05m

$490

Washington, D.C.Bilbao

IAD - BIO

IADBIO

Washington, D.C. Dulles Intl

Mon 9/22

10:20 pm-11:25 pm

1 stop19h 05m

Bilbao

Tue 9/30

6:45 am-1:30 pm

1 stop12h 45m

$492

Washington, D.C.Bilbao

IAD - BIO

IADBIO

Washington, D.C. Dulles Intl

Sun 9/21

10:20 pm-11:25 pm

1 stop19h 05m

Bilbao

Tue 9/30

6:45 am-1:30 pm

1 stop12h 45m

$492

Washington, D.C.Bilbao

IAD - BIO

IADBIO

Washington, D.C. Dulles Intl

Sun 10/5

4:35 pm-8:30 am

1 stop9h 55m

Bilbao

Tue 10/21

6:45 am-3:00 pm

1 stop14h 15m

$493

Washington, D.C.Bilbao

IAD - BIO

IADBIO

Washington, D.C. Dulles Intl

Wed 10/1

1:00 pm-1:25 pm

2 stops18h 25m

Bilbao

Wed 10/22

6:45 am-9:05 pm

2 stops20h 20m

$496

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/14

Showing 1-10 of 20 results
1
2

Best time to book a flight from Dulles Intl to Bilbao

Have a flexible travel schedule? Discover the best time to fly to Bilbao from Dulles Intl 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 Washington, D.C. Dulles Intl Airport to Bilbao

What is the cheapest time of day to fly from IAD to BIO?

Find hourly flight availability from Dulles Intl 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 August 16, 2025.

It’s typically best to fly out from Washington, D.C. Dulles Intl Airport to Bilbao in the morning. Doing so could potentially save you 1% on the flight price compared to flying at noon, which is usually more expensive.

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 August 16, 2025.
Get a feel of what it's like to fly with KLM, United Airlines, and TAP AIR PORTUGAL from Washington, D.C. Dulles Intl Airport to Bilbao by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
KLM
7.8
Good
1,384 reviews

Comfort

7.7

Entertainment

7.1

Crew

8.4

Food

7.3

Boarding

7.8

Overall

7.8

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.
KLM
7.8
Good
1,384 reviews
KLM
7.8
Good
1,384 reviews

Comfort

7.7

Entertainment

7.1

Crew

8.4

Food

7.3

Boarding

7.8

Overall

7.8

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.
United Airlines
7.4
Good
8,916 reviews
KLM
7.8
Good
1,384 reviews

Comfort

7.7

Entertainment

7.1

Crew

8.4

Food

7.3

Boarding

7.8

Overall

7.8

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.
TAP AIR PORTUGAL
7.1
Good
1,951 reviews
KLM
7.8
Good
1,384 reviews

Comfort

7.7

Entertainment

7.1

Crew

8.4

Food

7.3

Boarding

7.8

Overall

7.8

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.
Iberia
7.0
Good
2,884 reviews
KLM
7.8
Good
1,384 reviews

Comfort

7.7

Entertainment

7.1

Crew

8.4

Food

7.3

Boarding

7.8

Overall

7.8

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.
Lufthansa
6.8
Okay
7,322 reviews
KLM
7.8
Good
1,384 reviews

Comfort

7.7

Entertainment

7.1

Crew

8.4

Food

7.3

Boarding

7.8

Overall

7.8

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.

Related info for your journey

Find useful and relevant information for your journey from Dulles Intl to Bilbao. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to Bilbao from Washington, D.C. Dulles Intl?

    Most people fly into Bilbao (BIO) if they book a flight to Bilbao from Washington, D.C. Dulles Intl. On average, Bilbao has 0 inbound flights from Washington, D.C. Dulles Intl per day from 5 airlines. Bilbao is conveniently located just 3.0 mi from Bilbao’s city center.

  • What are the cheapest airlines flying from Washington, D.C. Dulles Intl Airport to Bilbao round-trip?

    Our cheapest airline available from Washington, D.C. Dulles Intl Airport to Bilbao is TAP AIR PORTUGAL. Our recent data shows that you can find tickets from as low as $449 on this airline. Additional options worth looking into are KLM and Iberia, starting at $503 and $509 round-trip. These flights start at 41% lower than the current average price 3 months from now.

  • Can I find deals for flights from Dulles Intl to Bilbao that include hotel bookings?

    Yes. In addition to deals on Dulles Intl to Bilbao flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Dulles Intl to Bilbao?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Dulles Intl to Bilbao.

  • Can I find deals for business class flights from Dulles Intl to Bilbao?

    Yes. Cheapflights offers flight deals from Dulles Intl 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 Washington, D.C. Dulles Intl Airport to Bilbao?

    Currently, January is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Bilbao (average of $541). Flying from Washington, D.C. Dulles Intl Airport to Bilbao in June is currently the most expensive (average of $1,139). 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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Alternative routes for Dulles Intl to Bilbao

See prices for flight routes from nearby airports that may be better suited for you.
Reagan-National to Bilbao flights
Baltimore to Bilbao flights
Dulles Intl to San Sebastian flights
Reagan-National to San Sebastian flights
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Top 5 airlines flying from Dulles Intl to Bilbao

Discover the top 5 airlines that operate flights from Dulles Intl 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 August 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
TAP AIR PORTUGALCheapest$449Average$834FlexibilityNo cancel feeOn-timeN/A
KLMCheapest$503Average$637FlexibilityNo cancel feeOn-time75%
IberiaCheapest$509Average$695FlexibilityNo cancel feeOn-time77%
United AirlinesCheapest$514Average$758FlexibilityNo cancel feeOn-time69%
LufthansaCheapest$605Average$780FlexibilityNo cancel feeOn-time76%

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