TK 9588 then UA 901 at San Francisco
Portland (Oregon) → San Francisco → London
Timetable, San Francisco time
15:15TK 9588 from Portland (Oregon) at the gate
12:50UA 901 to London leaves the gatealso LX 3069, AC 5448, OS 7856, SN 9105, LH 9375, NZ 9830
21 h 35 apart on the timetable, overnight
UA 901 leaves 21 h 35 after TK 9588 arrives on the timetable: more than half a day, so not a connection we count.