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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
$532 USD
-21%
$418
USD
Verified Nov 25, 2025 at 5:01 AM
December 2025
Today
Mon
Tue
Wed
Thu
Fri
Sat
Sun
1
$493
2
$493
3
$493
4
$543
5
$548
6
$549
7
$499
8
$424
9
$418
10
$418
11
$468
12
$707
13
$549
14
$483
15
$483
16
$673
17
$993
18
$1,191
19
$1,677
20
$1,288
21
$1,121
22
$872
23
$843
24
$537
25
$527
26
$693
27
$890
28
$537
29
$537
30
$524
31
$418
1
2
3
4
Fair Availability
28% of dates checked are available within 10% of the lowest price
Saturday, December 20th, 2025
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