United Airlines is a founding member of the Star Alliance, which remains the largest and most comprehensive global airline network in 2026. Being part of Star Alliance means that United travelers can earn and redeem MileagePlus miles on over 25 different partner airlines, including Lufthansa, Air Canada, ANA (All Nippon Airways), Singapore Airlines, and Turkish Airlines. This partnership provides United passengers with seamless connectivity to over 1,200 destinations in 190 countries on a single ticket. For frequent flyers, the alliance is particularly valuable because United "Premier" status translates into Star Alliance Silver or Gold status. A Star Alliance Gold member flying United can access over 1,000 airport lounges worldwide, even when flying in economy on a partner carrier. In 2026, the alliance has also expanded its "intermodal" partnerships, allowing United passengers to book connecting high-speed rail journeys in Europe (like Deutsche Bahn) directly through the United app, all while earning airline miles. This makes United part of the most powerful loyalty ecosystem in the aviation industry, far outpacing the reach of SkyTeam (Delta) or Oneworld (American).