When flying from Ketchikan to Bangkok, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.
Ketchikan (KTN) is the airport you will fly out of if you book a flight from Ketchikan to Bangkok. You should not have trouble finding flights to Bangkok from Ketchikan; the airport handles an average of 0 outbound flights to Bangkok per day. You should also have plenty of airline options to choose from since 0 airlines have flights from the Ketchikan airport to Bangkok. It is only a 2.7 mi journey to Ketchikan (KTN) from Ketchikan’s city center.