BIO to ORD from $399 in economy – flightdeals.net

Home Premium Fare Deals About

American Airlines

AAAmerican Airlines

Finnair

British Airways

BABritish Airways

Iberia Airlines

IBIberia Airlines

Round Trip•Economy

Bilbao Airport

O'Hare International Airport

Chicago, United States

$903 USD

-56%$399 USD

Verified 16 days ago

September 2026

Mon

Tue

Wed

Thu

Fri

Sat

Sun

31$512 1$410 2$417 3$399 4$434 5$417 6$668 7$489 8$410 9$399 10$399 11$417 12$575 13$735 14$506 15$399 16$399 17$399 18$417 19$445 20$668 21$489 22$478 23$399 24$399 25$668 26$753 27$735 28$616 29$525 30$399 1$399 2$571 3$654 4$812

Limited Availability

10% of dates checked are available within 10% of the lowest price

Tuesday, September 22nd, 2026

3 round-trip options

Returning

Mon, Sep 28, 2026•6 Day Trip

$478 USD

Returning

Wed, Sep 30, 2026•8 Day Trip

$557 USD

Returning

Fri, Oct 2, 2026•10 Day Trip

$901 USD