AS 464 then WN 257 at Atlanta
Seattle → Atlanta → Washington National
Timetable, Atlanta time
07:30AS 464 from Seattle at the gate
17:40WN 257 to Washington National leaves the gate
10 h 10 apart on the timetable
The last days
AS 464 and WN 257 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.