Pangaklan Bun (PKN) in Central Kalimantan (Indonesian Borneo) is the closest airport to Kumai, the gateway to Tanjung Puting National Park (Kaliman Borneo, Indonesia).
If you are flying directly to Indonesia, try Jakarta (CGK), Surabaya (SUB), and Denpasar, Bali (DPS).
If you are arriving from outside Indonesia, check fares to neighboring countries such as Singapore (SIN), Kuala Lumpur, Malaysia (KUL), and Bangkok, Thailand (BKK).
You can check regional flight options and who flies when/where is www.skyscanner.com; Skyscanner shows what airlines fly to your destination, then connects you to the online booking site.
Thirty day Visas on Arrival (VOAs) are available at the Denpasar (DPS), Jakarta (CGK), and Surabaya (SUB) airport. Note that Denpasar (DPS), Jakarta (CGK), and Surabaya (SUB) airports have separate domestic airports, so be sure to allow extra time for customs and VOA.
When traveling to Pangkalan Bun, please make sure you allow enough time between flights in Surabaya and Jakarta, as there are sometimes flight delays due to inclement weather. Flights to and from Kalimantan typically leave and arrive on the same day, even if there are weather delays.
It is best to arrive the day before the tour, just in case of weather delays