UA 693 then SQ 1491 at San Francisco
Kailua-Kona → San Francisco → New York JFK
Timetable, San Francisco time
22:16UA 693 from Kailua-Kona at the gate
22:56SQ 1491 to New York JFK leaves the gate
40 min apart on the timetable
The last days
UA 693 and SQ 1491 weren’t both flown 15 min to 12 h apart in the last 21 days.
Statistics from past flights, not live flight information. Always check times and your connection with your airline, and don’t base travel or booking decisions on these numbers.