Getting There Silk Air ( silkair.com) flies between Kathmandu and Singapore five times weekly; Cathay Dragon ( cathaypacific.com) has a similar frequency from Hong Hong. When to Go Except for the winter months, Mustang is a year-round trekking destination, with mild summers and clear if windy weather in autumn. In May, Lo Manthang holds its colorful Tiji festival, a three-day celebration of Tibetan-Buddhist rituals aimed at chasing away demons ahead of the harvest season. Trip Notes The author traveled with Kathmandu-based Himalayan Dream Team ( himalayandreamteam.com), which offers individual trips to Upper Mustang starting from US$2,350 per person for a 10-day program. Asia-focused luxury travel designer Remote Lands (remotelands .com), with offices in Bangkok and New York, has even more exclusive itineraries, such as an 11-day Mustang adventure priced at US$12,900 per person, including a private helicopter ride back to Kathmandu.