I would strongly recommend NOT using Omni Trek Nepal! We recently went on a trek organised by them. They booked our return flights from Lukla on the wrong day, consequently we were stuck there for 3 days (had to pay our own way and there are no working ATM's in Lukla)! Omni assumed no responsibility for there error. Our guides advised us that it could have been a 6/7 day wait as they desperately tried to get us on another flight! 6 of us had to pay $3,300AUD to charter a helicopter (which was no easy task to organise, no thanks to Omni) as we would have missed our international flights home! We met the owner of Omni back in Kathmandu, he just sat there with a cheesy grin on his face and assumed no responsibility for his error for something which we had booked almost 5 months in advance! It was a very sad way to end our Trek as we had such a great time... but I would strongly recommend NOT using Omni Trek Nepal!