Chicago (ORD) to Bilbao (BIO) flight deal in economy from $735
$969 USD
-24%$735 USD
Verified 1 day agoSeptember 2026
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Fair Availability
29% of dates checked are available within 10% of the lowest price
Thursday, September 10th, 2026
1 round-trip options
Returning
Fri, Sep 18, 2026•8 Day Trip
$890 USD