Thai Airways has cancelled domestic routes on 1 and 2 October 2026, including Bangkok to Phuket, Chiang Mai, Ubon Ratchathani, Khon Kaen, Chiang Rai, Hat Yai and Udon Thani, plus several international routes such as Frankfurt, Singapore, New Delhi, Mumbai and Hanoi. Further international cancellations fall on 2 and 3 October, and the TG401 Singapore departure moves to 03.40 on 2 October. If your business ships goods, hosts travelling clients or staff, or relies on these routes, rebook flights now and arrange alternative transport or dates. The article gives no cause and no end date beyond saying the airline is working to resolve the situation.