How to avoid Lukla Flight for EBC?

Lukla Town, which houses the Tenzing-Hillary Airport, is the principal gateway for hikers traveling to Everest Base Camp (EBC). Lukla flights are operated from two airports of Nepal, Kathmandu and Manthali (Ramechhap). During peak trekking seasons ( Autumn- Sep-Nov) and Spring-Mar-May), flights from Kathmandu to Lukla are routed via Manthali due to jam in air traffic. But, in off-trekking seasons( Winter and Rainy- Dec-Feb and June-Aug) Lukla flights are highly weather-dependent, leading to cancellations and delays. It is important to know about flight operations, seasonal changes, costing according to the seasons and associated risks for a smooth Everest Base Camp trekking experience. Below is a detailed FAQ covering all the facets of Lukla flights, fares, operations, and possible disruptions.