Ten international airlines have restarted scheduled flights to Kathmandu after nearly six months, and although there is high passenger demand, the flight capacity is limited because of the government’s threshold of only 800 passengers allowed disembark per day.

The first week of flights saw airlines operating with limited frequency and restricted number of passengers per flight. For the moment, only Nepali nationals, diplomats and employees of aid agencies and their families are allowed in.
 
All passengers need to have a RT PCR negative test done 72 hours before departure, and that requirement has now been extended to passengers also on charter flights from the Gulf bringing Nepali workers home. Those with PCR negative reports are allowed to go home for a 7-day self-quarantine.

https://www.nepalitimes.com/latest/flights-to-nepal-limited-by-airport-capacity/