When flying from Bangkok to Ipoh, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.
Ipoh (IPH) is the airport you will fly into if you book a flight from Bangkok to Ipoh. You should not have trouble finding flights to Ipoh from Bangkok; the airport handles an average of 0 inbound flights from Bangkok per day. You should also have plenty of airline options to choose from since 0 airlines have flights to the Ipoh airport from Bangkok. It is only a 2.1 km journey from Ipoh (IPH) to Ipoh’s city centre.