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Bilbao

$266+ 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 9/23. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — BIO
Oct 11 — Oct 181
Sat 10/11
Sat 10/18
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 September 11, 2025.

Round-trip from

$421
(FlightHub)

One-way from

$266
(TAP AIR PORTUGAL)

Popular in

December

Cheapest in

September

Average price

$530
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. 20% potential increase in price ($195 potential increase over avg. RT price).
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Cheapest flight prices on average. 5% potential price decrease ($42 potential savings vs. average RT price).
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Average for round-trip flights in September 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 September 11, 2025.

This FlightHub deal was found by Cheapflights users on 9/10. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/210:30 pmIAD - BIO
1 stop14h 05mTAP AIR PORTUGAL
Mon 11/177:20 pmBIO - IAD
1 stop25h 15mTAP AIR PORTUGAL
Deal found 9/10$421
This lol.travel deal was found by Cheapflights users on 9/10. 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.
Mon 9/2210:20 pmIAD - BIO
1 stop19h 05mUnited Airlines
Wed 10/87:15 amBIO - IAD
1 stop13h 50mUnited Airlines
Deal found 9/10$427
This Kiwi.com deal was found by Cheapflights users on 9/10. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/2210:20 pmIAD - BIO
1 stop19h 05mLufthansa
Wed 10/811:50 amBIO - IAD
1 stop13h 35mLufthansa
Deal found 9/10$435
This United Airlines deal was found by Cheapflights users on 9/10. 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 11/210:55 pmIAD - BIO
1 stop13h 10mUnited Airlines
Thu 11/137:25 amBIO - IAD
1 stop14h 10mUnited Airlines
Deal found 9/10$453
This KLM deal was found by Cheapflights users on 9/11. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/19:20 pmIAD - BIO
1 stop18h 40mKLM
Wed 10/227:10 amBIO - IAD
1 stop15h 10mKLM
Deal found 9/11$457
This Delta deal was found by Cheapflights users on 9/10. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/2212:08 pmIAD - BIO
2 stops16h 17mDelta
Wed 10/86:50 amBIO - IAD
1 stop14h 45mDelta
Deal found 9/10$458
This KLM deal was found by Cheapflights users on 9/9. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/69:35 pmIAD - BIO
1 stop30h 50mKLM
Mon 10/135:15 pmBIO - IAD
1 stop28h 20mKLM
Deal found 9/9$459
This Delta deal was found by Cheapflights users on 9/9. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/112:08 pmIAD - BIO
2 stops16h 17mDelta
Wed 10/227:10 amBIO - IAD
1 stop15h 10mDelta
Deal found 9/9$461
This Air Canada deal was found by Cheapflights users on 9/10. 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 11/51:20 pmIAD - BIO
2 stops22h 45mAir Canada
Tue 11/186:45 amBIO - IAD
2 stops39h 06mAir Canada
Deal found 9/10$474
This Air Canada deal was found by Cheapflights users on 9/10. 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.
Sun 11/21:20 pmIAD - BIO
2 stops22h 45mAir Canada
Wed 11/197:25 amBIO - IAD
2 stops38h 56mAir Canada
Deal found 9/10$478
This Air Canada deal was found by Cheapflights users on 9/10. 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.
Mon 11/39:45 amIAD - BIO
2 stops21h 05mAir Canada
Tue 11/186:45 amBIO - IAD
2 stops19h 41mAir Canada
Deal found 9/10$479
This Air Canada deal was found by Cheapflights users on 9/10. 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.
Sun 11/21:20 pmIAD - BIO
2 stops22h 45mAir Canada
Thu 11/137:25 amBIO - IAD
2 stops38h 26mAir Canada
Deal found 9/10$485

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 September 11, 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

Mon 11/3

5:40 pm-10:50 am

1 stop11h 10m

Bilbao

Tue 11/18

7:25 am-3:35 pm

1 stop14h 10m

$453

Washington, D.C.Bilbao

IAD - BIO

IADBIO

Washington, D.C. Dulles Intl

Tue 11/4

5:40 pm-10:50 am

1 stop11h 10m

Bilbao

Fri 11/14

7:25 am-3:35 pm

1 stop14h 10m

$453

Washington, D.C.Bilbao

IAD - BIO

IADBIO

Washington, D.C. Dulles Intl

Mon 11/3

10:55 pm-11:05 pm

1 stop18h 10m

Bilbao

Fri 11/14

11:35 am-8:05 pm

1 stop14h 30m

$453

Washington, D.C.Bilbao

IAD - BIO

IADBIO

Washington, D.C. Dulles Intl

Sun 11/2

10:55 pm-6:05 pm

1 stop13h 10m

Bilbao

Thu 11/13

7:25 am-3:35 pm

1 stop14h 10m

$453

Washington, D.C.Bilbao

IAD - BIO

IADBIO

Washington, D.C. Dulles Intl

Mon 11/3

10:55 pm-11:05 pm

1 stop18h 10m

Bilbao

Wed 11/19

11:35 am-8:05 pm

1 stop14h 30m

$453

Washington, D.C.Bilbao

IAD - BIO

IADBIO

Washington, D.C. Dulles Intl

Wed 11/5

10:55 pm-6:05 pm

1 stop13h 10m

Bilbao

Wed 11/19

11:35 am-8:05 pm

1 stop14h 30m

$453

Washington, D.C.Bilbao

IAD - BIO

IADBIO

Washington, D.C. Dulles Intl

Tue 11/4

5:40 pm-10:50 am

1 stop11h 10m

Bilbao

Tue 11/18

7:25 am-3:35 pm

1 stop14h 10m

$453

Washington, D.C.Bilbao

IAD - BIO

IADBIO

Washington, D.C. Dulles Intl

Wed 10/1

9:20 pm-10:00 pm

1 stop18h 40m

Bilbao

Wed 10/22

7:10 am-4:20 pm

1 stop15h 10m

$457

Washington, D.C.Bilbao

IAD - BIO

IADBIO

Washington, D.C. Dulles Intl

Mon 9/22

12:08 pm-10:25 am

2 stops16h 17m

Bilbao

Wed 10/8

6:50 am-3:35 pm

1 stop14h 45m

$458

Washington, D.C.Bilbao

IAD - BIO

IADBIO

Washington, D.C. Dulles Intl

Mon 10/6

9:35 pm-10:25 am

1 stop30h 50m

Bilbao

Mon 10/13

5:15 pm-3:35 pm

1 stop28h 20m

$459

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/9

Showing 1-10 of 16 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 September 11, 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.

How much does it cost to fly round-trip from Washington, D.C. Dulles Intl Airport to Bilbao?

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 September 11, 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
1,385 reviews

Boarding

7.8

Entertainment

7.2

Comfort

7.7

Food

7.3

Crew

8.4

Overall

7.8

Reviews

1 / 20
4.0
Okay

Mark,Sep 2025

AMS - BHX

Crew and snacks were good, boarding wasn't great as busses were used rather than boarding tunnels. Also endured a one hour delay.
KLM
7.8
Good
1,385 reviews
KLM
7.8
Good
1,385 reviews

Boarding

7.8

Entertainment

7.2

Comfort

7.7

Food

7.3

Crew

8.4

Overall

7.8

Reviews

1 / 20
4.0
Okay

Mark,Sep 2025

AMS - BHX

Crew and snacks were good, boarding wasn't great as busses were used rather than boarding tunnels. Also endured a one hour delay.
United Airlines
7.4
Good
8,937 reviews
KLM
7.8
Good
1,385 reviews

Boarding

7.8

Entertainment

7.2

Comfort

7.7

Food

7.3

Crew

8.4

Overall

7.8

Reviews

1 / 20
4.0
Okay

Mark,Sep 2025

AMS - BHX

Crew and snacks were good, boarding wasn't great as busses were used rather than boarding tunnels. Also endured a one hour delay.
TAP AIR PORTUGAL
7.1
Good
1,977 reviews
KLM
7.8
Good
1,385 reviews

Boarding

7.8

Entertainment

7.2

Comfort

7.7

Food

7.3

Crew

8.4

Overall

7.8

Reviews

1 / 20
4.0
Okay

Mark,Sep 2025

AMS - BHX

Crew and snacks were good, boarding wasn't great as busses were used rather than boarding tunnels. Also endured a one hour delay.
Iberia
7.0
Good
2,929 reviews
KLM
7.8
Good
1,385 reviews

Boarding

7.8

Entertainment

7.2

Comfort

7.7

Food

7.3

Crew

8.4

Overall

7.8

Reviews

1 / 20
4.0
Okay

Mark,Sep 2025

AMS - BHX

Crew and snacks were good, boarding wasn't great as busses were used rather than boarding tunnels. Also endured a one hour delay.
Lufthansa
6.8
Okay
7,409 reviews
KLM
7.8
Good
1,385 reviews

Boarding

7.8

Entertainment

7.2

Comfort

7.7

Food

7.3

Crew

8.4

Overall

7.8

Reviews

1 / 20
4.0
Okay

Mark,Sep 2025

AMS - BHX

Crew and snacks were good, boarding wasn't great as busses were used rather than boarding tunnels. Also endured a one hour delay.

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.

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

    For as low as $453, United Airlines can have you in Bilbao from Washington, D.C. Dulles Intl Airport in 11h 10m. The distance between Washington, D.C. Dulles Intl Airport and Bilbao is about 3757 mi.

  • 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 $447 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.

  • What are the cheapest airlines to fly from Washington, D.C. Dulles Intl Airport to Bilbao one-way?

    The cheapest airline one-way is TAP AIR PORTUGAL, with whom users have recently found tickets for as low as $266. However, be on the lookout for offers from Delta and Air Canada, as they are both options that can get you from Washington, D.C. Dulles Intl Airport to Bilbao for a low price.

  • 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 $1,136). 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
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Dulles Intl to San Sebastian flights
Baltimore to San Sebastian flights

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 September 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
TAP AIR PORTUGALCheapest$447Average$833FlexibilityNo cancel feeOn-timeN/A
KLMCheapest$503Average$750FlexibilityNo cancel feeOn-time75%
IberiaCheapest$509Average$695FlexibilityNo cancel feeOn-time77%
United AirlinesCheapest$514Average$758FlexibilityNo cancel feeOn-time69%
LufthansaCheapest$530Average$780FlexibilityNo cancel feeOn-time76%

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