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AF
Air France
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Delta Air Lines
KL
KLM
One Way
•
Economy
IAD
Washington Dulles International Airport
Washington, United States
BIO
Bilbao Airport
Bilbao, Spain
$507 USD
-25%
$378
USD
Verified Nov 29, 2025 at 5:33 AM
February 2026
Today
Mon
Tue
Wed
Thu
Fri
Sat
Sun
26
$378
27
$378
28
$378
29
$428
30
$428
31
$428
1
$378
2
$378
3
$378
4
$378
5
$428
6
$428
7
$428
8
$378
9
$378
10
$378
11
$378
12
$532
13
$430
14
$428
15
$378
16
$378
17
$378
18
$378
19
$428
20
$428
21
$428
22
$378
23
$378
24
$378
25
$378
26
$428
27
$428
28
$423
1
Fair Availability
26% of dates checked are available within 10% of the lowest price
Monday, February 2nd, 2026
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