Flight from Kathmandu Airport to Taplejung Airport twice a week or Flight to Bhadrapur (ca 45 min) and Bus/Jeep Travel (ca 8-10h) to Taplejung which would take an additional day.
POIs
Taplejung Airport (IATA: TPJ, ICAO: VNTJ), also known as Suketar Airport, is
a domestic airport located in Phungling (~20,000 people) serving Taplejung District, a
district in Koshi Province in Nepal. It is the main tourist gateway on the
Kangchenjunga mountainous area and Pathibhara Devi Temple.
Phungling Municipality is linked with roadway and airway. It is connected to
rest of the country through the Mechi Highway, a 268-km road which begins in
Kechana of Jhapa district and ends in Taplejung. Passenger buses and jeeps to
Taplejung are easily available in Birtamod. Suketar Airport has flights from
Biratnagar and Kathmandu.
One of the major attractions is the Pathibhara Devi Temple. This little-known region attracts tourists seeking spiritual fulfillment and blessings from the powerful Pathibhara Devi. Kiranti, Hindus and Buddhists reach the temple for celebrations during special occasions. The trek to pathibhara Devi (3794 m) combined with the natural and cultural experiences of the region make the visit a unique exhilarating experience. It takes a day to reach the temple on foot from Taplejung Bazaar. On the way to the temple are many species of rhododendron which are unique. wikipedia