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AF
Air France
DL
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
April 2026
Today
Mon
Tue
Wed
Thu
Fri
Sat
Sun
30
$445
31
$443
1
$448
2
$503
3
$548
4
$543
5
$483
6
$483
7
$483
8
$485
9
$543
10
$548
11
$543
12
$483
13
$483
14
$483
15
$448
16
$503
17
$505
18
$503
19
$443
20
$443
21
$443
22
$448
23
$503
24
$508
25
$503
26
$443
27
$445
28
$443
29
$443
30
$503
1
2
3
Fair Availability
26% of dates checked are available within 10% of the lowest price
Wednesday, April 22nd, 2026
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