The flight from the Tribhuvan International Airport to Lukla airport are being diverted to the Manthali Airport starting from April 1, 2019, to July 30, 2019. The officials have stated that the runway at the Tribhuvan International Airport is going to be maintained during the mentioned interval.
You will be required to drive to the Manthali Airport which lies in Manthali, the headquarters of the Ramechhap District. You need to spend a night before flying to Lukla here and then get on a flight to Lukla. Returning to Kathmandu will also retrace the exact route back but you don't have to spend a night here when you return. Manthali Airport is 132 kilometres away from east of Kathmandu and requires around 4 hours’ of a drive.
You can fly to Lukla by Chartered Heli Flight from Kathmandu. It is advised that you should contact your travel partner to book a Heli flight to Lukla if necessary. You should also bear in mind that these helicopter flights cost you more than a typical aeroplane flight.