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$244+ Cheap flights from Washington, D.C. (WAS) 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 10/4. Fares are subject to change and may not be available on all flights or dates of travel.
WAS — BIO
Oct 17 — Oct 241
Fri 10/17
Fri 10/24
1 adult, Economy
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Cheapflights Tip: The best prices from Washington, D.C. to Bilbao are usually found in February or October, booked 34 days in advance, depart on a Monday or Tuesday and return on a Monday

Cheap flight deals from Washington, D.C. to Bilbao

Discover tips and strategies to find the most affordable flight options for your journey from Washington, D.C. (WAS) 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 17, 2025.

Round-trip from

$393
(United Airlines)

One-way from

$244
(Kiwi.com)

Popular in

December

Cheapest in

February

Average price

$644
From Washington, D.C. (WAS) to Bilbao
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One-way flight from Washington, D.C. (WAS) to Bilbao
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Highest demand for flights based on searches. 14% potential increase in price ($123 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 Washington, D.C. to Bilbao

Cheapest flights from Washington, D.C. to Bilbao
Explore the most affordable flight options available from Washington, D.C. to Bilbao. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 17, 2025.

This lol.travel deal was found by Cheapflights users on 9/15. 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 10/195:45 pmIAD - BIO
1 stop11h 55mTAP AIR PORTUGAL
Mon 11/37:20 pmBIO - IAD
1 stop25h 15mTAP AIR PORTUGAL
Deal found 9/15$410
This Kiwi.com deal was found by Cheapflights users on 9/16. 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.
Wed 10/1510:20 pmIAD - BIO
1 stop13h 30mLufthansa
Wed 10/2211:50 amBIO - IAD
1 stop13h 35mLufthansa
Deal found 9/16$414
This Kiwi.com deal was found by Cheapflights users on 9/17. 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.
Wed 12/310:55 pmIAD - BIO
1 stop13h 10mLufthansa
Wed 12/1011:35 amBIO - IAD
1 stop14h 30mLufthansa
Deal found 9/17$425
This Mytrip deal was found by Cheapflights users on 9/16. 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.
Wed 11/194:10 pmDCA - BIO
2 stops18h 00mMultiple Airlines
Wed 11/267:25 amBIO - DCA
2 stops20h 31mMultiple Airlines
Deal found 9/16$437
This Mytrip deal was found by Cheapflights users on 9/16. 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.
Wed 11/199:45 amIAD - BIO
2 stops24h 25mMultiple Airlines
Wed 11/2611:35 amBIO - IAD
1 stop14h 30mMultiple Airlines
Deal found 9/16$444
This Air Canada deal was found by Cheapflights users on 9/17. 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 12/34:10 pmDCA - BIO
2 stops19h 55mAir Canada
Wed 12/1011:35 amBIO - DCA
2 stops16h 21mAir Canada
Deal found 9/17$453
This Lufthansa deal was found by Cheapflights users on 9/16. 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 Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/1910:55 pmIAD - BIO
1 stop18h 10mLufthansa
Wed 11/267:25 amBIO - IAD
1 stop18h 40mLufthansa
Deal found 9/16$453
This KLM deal was found by Cheapflights users on 9/15. 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 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 9/15$457
This Air France deal was found by Cheapflights users on 9/16. 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 France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/19:20 pmIAD - BIO
1 stop31h 05mAir France
Wed 10/227:10 amBIO - IAD
1 stop18h 05mAir France
Deal found 9/16$458
This KLM deal was found by Cheapflights users on 9/15. 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 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 9/15$459
This FlightHub deal was found by Cheapflights users on 9/16. 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.
Wed 10/154:35 pmIAD - BIO
2 stops14h 35mIberia
Wed 10/226:45 amBIO - IAD
1 stop14h 15mIberia
Deal found 9/16$460
This Mytrip deal was found by Cheapflights users on 9/16. 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.
Wed 10/158:45 pmIAD - BIO
2 stops15h 05mMultiple Airlines
Wed 10/226:45 amBIO - IAD
2 stops20h 20mMultiple Airlines
Deal found 9/16$463

Cheapflights Fare Finder

 
Customize your flight search to find flights from Washington, D.C. 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 17, 2025.
Use the filters below to find and compare flights from Washington, D.C. to Bilbao that are best for you.

Fly from

Washington, D.C.

Fly to

Bilbao

Route

Depart

Return

Price

Washington, D.C.Bilbao

IAD - BIO

IADBIO

Washington, D.C. Dulles Intl

Wed 10/15

10:20 pm-5:50 pm

1 stop13h 30m

Bilbao

Wed 10/22

11:50 am-7:25 pm

1 stop13h 35m

$414

Washington, D.C.Bilbao

DCA - BIO

DCABIO

Washington, D.C. Reagan-National

Wed 11/19

4:10 pm-4:10 pm

2 stops18h 00m

Bilbao

Wed 11/26

7:25 am-9:56 pm

2 stops20h 31m

$437

Washington, D.C.Bilbao

IAD - BIO

IADBIO

Washington, D.C. Dulles Intl

Wed 11/19

9:45 am-4:10 pm

2 stops24h 25m

Bilbao

Wed 11/26

11:35 am-8:05 pm

1 stop14h 30m

$444

Washington, D.C.Bilbao

IAD - BIO

IADBIO

Washington, D.C. Dulles Intl

Wed 11/19

10:55 pm-11:05 pm

1 stop18h 10m

Bilbao

Wed 11/26

7:25 am-8:05 pm

1 stop18h 40m

$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 2/9

6:50 pm-5:20 pm

1 stop16h 30m

Bilbao

Mon 2/16

5:20 pm-4:05 pm

1 stop28h 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

Washington, D.C.Bilbao

IAD - BIO

IADBIO

Washington, D.C. Dulles Intl

Wed 12/3

4:30 pm-11:05 pm

2 stops24h 35m

Bilbao

Wed 12/10

7:25 am-8:05 pm

1 stop18h 40m

$460

Washington, D.C.Bilbao

IAD - BIO

IADBIO

Washington, D.C. Dulles Intl

Wed 10/15

4:35 pm-1:10 pm

2 stops14h 35m

Bilbao

Wed 10/22

6:45 am-3:00 pm

1 stop14h 15m

$460

Washington, D.C.Bilbao

IAD - BIO

IADBIO

Washington, D.C. Dulles Intl

Wed 10/15

8:45 pm-5:50 pm

2 stops15h 05m

Bilbao

Wed 10/22

6:45 am-9:05 pm

2 stops20h 20m

$463

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/15

Showing 1-10 of 58 results
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Best time to book a flight from Washington, D.C. to Bilbao

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

How far ahead should I book a flight from Washington, D.C. to Bilbao?

Use this chart to determine the optimal time to book a round-trip flight from Washington, D.C. to Bilbao. Price data was last updated on September 12, 2025.

The best time to book flights from Washington, D.C. to Bilbao is 34 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

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

Find hourly flight availability from Washington, D.C. 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 17, 2025.

It’s typically best to fly out from Washington, D.C. to Bilbao in the evening. Doing so could potentially save you 15% 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. 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 17, 2025.
See what other customers who have flown with Delta, United Airlines, and TAP AIR PORTUGAL from Washington, D.C. to Bilbao have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,961 reviews

Comfort

7.9

Crew

8.5

Food

7.3

Overall

8.0

Entertainment

7.9

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Delta
8.0
Very good
7,961 reviews
Delta
8.0
Very good
7,961 reviews

Comfort

7.9

Crew

8.5

Food

7.3

Overall

8.0

Entertainment

7.9

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
United Airlines
7.4
Good
8,926 reviews
Delta
8.0
Very good
7,961 reviews

Comfort

7.9

Crew

8.5

Food

7.3

Overall

8.0

Entertainment

7.9

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
TAP AIR PORTUGAL
7.1
Good
1,977 reviews
Delta
8.0
Very good
7,961 reviews

Comfort

7.9

Crew

8.5

Food

7.3

Overall

8.0

Entertainment

7.9

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Iberia
7.0
Good
2,925 reviews
Delta
8.0
Very good
7,961 reviews

Comfort

7.9

Crew

8.5

Food

7.3

Overall

8.0

Entertainment

7.9

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Lufthansa
6.8
Okay
7,409 reviews
Delta
8.0
Very good
7,961 reviews

Comfort

7.9

Crew

8.5

Food

7.3

Overall

8.0

Entertainment

7.9

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Related info for your journey

Find useful and relevant information for your journey from Washington, D.C. 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.?

    If you book a flight to Bilbao from Washington, D.C., you will be flying to Bilbao, which is the city’s only airport. Bilbao (BIO) is located 3.0 mi from the center of Bilbao. There are 0 flights from Washington, D.C. to Bilbao per day from 5 different airlines.

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

    A quick flight from Washington, D.C. to Bilbao can take about 13h 30m. Lufthansa provides one of the quickest options available for as low as $414. The distance from Washington, D.C. to Bilbao is about 3757 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

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

    Currently priced at $447, TAP AIR PORTUGAL will fly you from Washington, D.C. to Bilbao and back. In addition to TAP AIR PORTUGAL, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from KLM and Iberia - these airlines can fly you to your destination from $503 and $509, respectively. TAP AIR PORTUGAL is currently priced 39% below the average price you’ll pay for this route.

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

    The cheapest airline one-way is TAP AIR PORTUGAL, with whom users have recently found tickets for as low as $249. However, be on the lookout for offers from Air Canada and Delta, as they are both options that can get you from Washington, D.C. to Bilbao for a low price.

  • What are the most popular routes from Washington, D.C. to Bilbao?

    While some choose either Washington, D.C. Reagan-National - Bilbao or Baltimore/Washington - Bilbao, Washington, D.C. Dulles Intl - Bilbao is the most popular route from Washington, D.C. to Bilbao.

  • Can I find deals for flights from Washington, D.C. to Bilbao that include hotel bookings?

    Yes. In addition to deals on Washington, D.C. to Bilbao flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Washington, D.C. to Bilbao?

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

  • Can I find deals for business class flights from Washington, D.C. to Bilbao?

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

    Currently, January is the cheapest month in which you can book a flight from Washington, D.C. to Bilbao (average of $541). Flying from Washington, D.C. 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 Washington, D.C. to Bilbao

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

Top 5 airlines flying from Washington, D.C. to Bilbao

Discover the top 5 airlines that operate flights from Washington, D.C. 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 17, 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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