Aer Lingus links Chicago nonstop with London (LHR), Dublin (DUB), and Madrid (MAD).
Aero4M links Chicago nonstop with Bucharest (OTP).
Air Canada (Star Alliance) links Chicago nonstop with London (LHR), Frankfurt-am-Main (FRA), Dublin (DUB), Paris (CDG), Reykjavik (KEF), Rome (FCO), Zurich (ZRH), Munich (MUC), Amsterdam (AMS), Barcelona (BCN), Brussels (BRU), Milan (MXP), Athens (ATH), Edinburgh (EDI), and Shannon (SNN).
Air France (SkyTeam) links Chicago nonstop with Paris (CDG), Amsterdam (AMS), and Copenhagen (CPH).
Air Serbia links Chicago nonstop with Belgrad (BEG).
airBaltic links Chicago nonstop with Reykjavik (KEF) and Lisbon (LIS).
Alaska Airlines (Oneworld) links Chicago nonstop with London (LHR), Frankfurt-am-Main (FRA), Paris (CDG), Madrid (MAD), Rome (FCO), Barcelona (BCN), Athens (ATH), and Helsinki (HEL).
Alitalia (Star Alliance) links Chicago nonstop with Rome (FCO).
American Airlines (Oneworld) links Chicago nonstop with London (LHR), Dublin (DUB), Paris (CDG), Madrid (MAD), Rome (FCO), Barcelona (BCN), Athens (ATH), Helsinki (HEL), and Napoli (NAP).
Atlantic Airways links Chicago nonstop with Reykjavik (KEF).
Austrian Airlines (Star Alliance) links Chicago nonstop with London (LHR), Dublin (DUB), Reykjavik (KEF), Rome (FCO), Zurich (ZRH), Brussels (BRU), Milan (MXP), and Vienna (VIE).
British Airways (Oneworld) links Chicago nonstop with London (LHR), Dublin (DUB), Paris (CDG), Madrid (MAD), Rome (FCO), Barcelona (BCN), Athens (ATH), Helsinki (HEL), and Napoli (NAP).
Brussels Airlines (Star Alliance) links Chicago nonstop with London (LHR), Dublin (DUB), Paris (CDG), Reykjavik (KEF), Rome (FCO), Zurich (ZRH), Brussels (BRU), and Milan (MXP).
Condor links Chicago nonstop with Frankfurt-am-Main (FRA).
Delta Air Lines (SkyTeam) links Chicago nonstop with Paris (CDG), Amsterdam (AMS), and Copenhagen (CPH).
Etihad Airways links Chicago nonstop with Rome (FCO).
Finnair (Oneworld) links Chicago nonstop with London (LHR), Dublin (DUB), Paris (CDG), Madrid (MAD), Rome (FCO), Barcelona (BCN), Athens (ATH), Helsinki (HEL), and Napoli (NAP).
Gulf Air links Chicago nonstop with London (LHR) and Paris (CDG).
Iberia (Oneworld) links Chicago nonstop with London (LHR), Dublin (DUB), Paris (CDG), Madrid (MAD), Rome (FCO), Barcelona (BCN), Athens (ATH), Helsinki (HEL), and Napoli (NAP).
Icelandair links Chicago nonstop with Reykjavik (KEF).
IndiGo links Chicago nonstop with Arnavutkoy (IST).
JetBlue links Chicago nonstop with Warsaw (WAW), Lisbon (LIS), Krakow (KRK), and Belgrad (BEG).
KLM (SkyTeam) links Chicago nonstop with Paris (CDG) and Amsterdam (AMS).
Kuwait Airways links Chicago nonstop with Rome (FCO).
LOT Polish Airlines (Star Alliance) links Chicago nonstop with Warsaw (WAW) and Krakow (KRK).
Lufthansa (Star Alliance) links Chicago nonstop with London (LHR), Frankfurt-am-Main (FRA), Dublin (DUB), Paris (CDG), Reykjavik (KEF), Rome (FCO), Zurich (ZRH), Munich (MUC), Amsterdam (AMS), Barcelona (BCN), Brussels (BRU), Milan (MXP), Athens (ATH), Edinburgh (EDI), and Shannon (SNN).
Malaysia Airlines (Oneworld) links Chicago nonstop with London (LHR).
Miat Mongolian Airlines links Chicago nonstop with Arnavutkoy (IST).
Pakistan International Airlines (PIA) links Chicago nonstop with Arnavutkoy (IST).
Royal Jordanian (Oneworld) links Chicago nonstop with London (LHR) and Paris (CDG).
Rwandair links Chicago nonstop with Arnavutkoy (IST).
Scandinavian Airlines (SkyTeam) links Chicago nonstop with Copenhagen (CPH).
SriLankan Airlines (Oneworld) links Chicago nonstop with London (LHR).
Swiss International Air Lines (Star Alliance) links Chicago nonstop with London (LHR), Dublin (DUB), Rome (FCO), Zurich (ZRH), Amsterdam (AMS), Brussels (BRU), and Milan (MXP).
TAP Portugal (Star Alliance) links Chicago nonstop with Lisbon (LIS).
TAROM (SkyTeam) links Chicago nonstop with Frankfurt-am-Main (FRA).
Thai Airways (Star Alliance) links Chicago nonstop with Frankfurt-am-Main (FRA).
Turkish Airlines (Star Alliance) links Chicago nonstop with Arnavutkoy (IST).
United Airlines (Star Alliance) links Chicago nonstop with London (LHR), Frankfurt-am-Main (FRA), Dublin (DUB), Paris (CDG), Reykjavik (KEF), Rome (FCO), Zurich (ZRH), Munich (MUC), Amsterdam (AMS), Barcelona (BCN), Brussels (BRU), Milan (MXP), Athens (ATH), Vienna (VIE), Edinburgh (EDI), and Shannon (SNN).
Uzbekistan Airways links Chicago nonstop with Arnavutkoy (IST).
Virgin Atlantic (SkyTeam) links Chicago nonstop with Paris (CDG) and Amsterdam (AMS).