All trains on the non-stop express line which links Phaya Thai station in inner Bangkok with Suvarnabhumi airport will undergo major maintenance during the period.
The Makkasan Express Line operates as usual, SRTET chief executive Peerakan Kaewwongwattana said on Thursday.
Mr Peerakan said each train will undergo a check-up for one to two months. Throughout the maintenance period, the service frequency on the city line will increase during rush hour. It will accommodate up to 45,000 people per day, he said.
Maintenance will be completed in April next year.