About 45% Starlink odds, weighted to recent UA1857 flights. A firm answer comes about 2 days before departure, once the aircraft is assigned.
Based on 62 recent flights; Starlink found in 6 of 8 Wi-Fi checks since Jan 9, 2026 (last N27239, Oct 7, 2026).
Aircraft seen on UA1857: Boeing 737-800, Boeing 737-900ER, Boeing 737 MAX 9.