There is no airport on Koh Lanta. The nearest airport to Koh Lanta is Krabi Airport (airport code: KBV). Krabi Airport is an international airport and also has numerous flights daily from Bangkok.
Krabi Airport recently expanded to accommodate more international flights arriving directly from overseas, but the majority of flights to Krabi Airport are domestic flights from Bangkok. There are numerous flights daily from Bangkok to Krabi, with the main carriers being Thai Smile – the budget airline of national airline Thai Airways – Air Asia, Bangkok Airways and Nok Air.
The fastest way from Krabi Airport to Koh Lanta is a minivan and speedboat combination transfer, which gets you onto Koh Lanta within 90 minutes. Alternatively, you can get a minivan which is a 2 to 3 hour drive due to frequent queues at two car ferry crossings. See Getting To Koh Lanta page for more details.