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AC
Air Canada
LH
Lufthansa
LX
Swiss International Air Lines
OS
Austrian Airlines
UA
United Airlines
One Way
•
Economy
SFO
San Francisco International Airport
San Francisco, United States
BIO
Bilbao Airport
Bilbao, Spain
$582 USD
-23%
$449
USD
Verified Nov 25, 2025 at 8:18 PM
December 2025
Today
Mon
Tue
Wed
Thu
Fri
Sat
Sun
1
$597
2
$522
3
$522
4
$572
5
$572
6
$572
7
$522
8
$505
9
$460
10
$452
11
$541
12
$712
13
$818
14
$852
15
$852
16
$1,037
17
$1,575
18
$1,611
19
$3,374
20
$1,716
21
$1,680
22
$1,149
23
$715
24
$702
25
$694
26
$577
27
$497
28
$536
29
$467
30
$465
31
$450
1
$499
2
$499
3
$599
4
$536
Fair Availability
32% of dates checked are available within 10% of the lowest price
Monday, December 29th, 2025
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