AS 506 then UA 599 at Dulles
San Diego → Washington → Denver
Timetable, Washington time
17:40AS 506 from San Diego at the gate
17:20UA 599 to Denver leaves the gate
23 h 40 apart on the timetable, overnight
UA 599 leaves 23 h 40 after AS 506 arrives on the timetable: more than half a day, so not a connection we count.