Yes! The adventurous Everest Base Camp trek always relies on the weather conditions. Sometimes a flight gets postponed or even canceled due to unpredictable weather changes at frequent intervals. Kathmandu to Lukla is a 25-minute flight that lands at 2800m / 9,186 feet airstrip at Tenzing Hillary Airport. Please be prepared accordingly with a few contingency days in case of cancelation of the domestic flights to and from Lukla.