During this itinerary, transportation is mainly on foot for trekking with minimal use of flights. In terms of costs, the primary expenses will be for the flight from Kathmandu to Lukla.
If you have more time, consider extending the trek and visit Tengboche or one of the nearby villages. If time is limited, shortened hikes to fewer destinations, but ensure you cross off your list of must-visit locations. Make sure to have the right gear for the trek and stay hydrated at all times.