Aer Lingus flies nonstop from Seattle to London (LHR) and Dublin (DUB).
Air Canada (Star Alliance) flies nonstop from Seattle to Frankfurt-am-Main (FRA) and Munich (MUC).
Air France (SkyTeam) flies nonstop from Seattle to London (LHR), Amsterdam (AMS), Rome (FCO), Barcelona (BCN), Paris (CDG), and Copenhagen (CPH).
airBaltic flies nonstop from Seattle to Reykjavik (KEF).
Alaska Airlines (Oneworld) flies nonstop from Seattle to London (LHR), Reykjavik (KEF), Frankfurt-am-Main (FRA), Rome (FCO), Paris (CDG), Helsinki (HEL), and Athens (ATH).
American Airlines (Oneworld) flies nonstop from Seattle to London (LHR), Dublin (DUB), and Helsinki (HEL).
Atlantic Airways flies nonstop from Seattle to Reykjavik (KEF).
Austrian Airlines (Star Alliance) flies nonstop from Seattle to Frankfurt-am-Main (FRA) and Munich (MUC).
British Airways (Oneworld) flies nonstop from Seattle to London (LHR), Dublin (DUB), and Helsinki (HEL).
Brussels Airlines (Star Alliance) flies nonstop from Seattle to Frankfurt-am-Main (FRA) and Munich (MUC).
Condor flies nonstop from Seattle to Frankfurt-am-Main (FRA).
Delta Air Lines (SkyTeam) flies nonstop from Seattle to London (LHR), Amsterdam (AMS), Rome (FCO), Barcelona (BCN), Paris (CDG), and Copenhagen (CPH).
Discover Airlines (Star Alliance) flies nonstop from Seattle to Frankfurt-am-Main (FRA) and Munich (MUC).
Etihad Airways flies nonstop from Seattle to Frankfurt-am-Main (FRA).
Finnair (Oneworld) flies nonstop from Seattle to London (LHR) and Helsinki (HEL).
Iberia (Oneworld) flies nonstop from Seattle to London (LHR), Dublin (DUB), and Helsinki (HEL).
Icelandair flies nonstop from Seattle to Reykjavik (KEF).
KLM (SkyTeam) flies nonstop from Seattle to London (LHR), Amsterdam (AMS), Rome (FCO), Barcelona (BCN), and Paris (CDG).
Lufthansa (Star Alliance) flies nonstop from Seattle to Frankfurt-am-Main (FRA) and Munich (MUC).
Saudia (SkyTeam) flies nonstop from Seattle to London (LHR), Amsterdam (AMS), and Paris (CDG).
Scandinavian Airlines (SkyTeam) flies nonstop from Seattle to London (LHR) and Copenhagen (CPH).
Swiss International Air Lines (Star Alliance) flies nonstop from Seattle to Frankfurt-am-Main (FRA) and Munich (MUC).
TAROM (SkyTeam) flies nonstop from Seattle to Frankfurt-am-Main (FRA).
Turkish Airlines (Star Alliance) flies nonstop from Seattle to Arnavutkoy (IST).
United Airlines (Star Alliance) flies nonstop from Seattle to Frankfurt-am-Main (FRA) and Munich (MUC).
Virgin Atlantic (SkyTeam) flies nonstop from Seattle to London (LHR), Amsterdam (AMS), and Paris (CDG).