Zone	Mileage Upgrades One way One sector	Economy Class (Y, B, M) to Royal Silk Class	Economy Class (H, Q, S, T, K) to Royal Silk Class	Economy Class (G, V, W) to Royal Silk Class	Economy Class (Y, B, M, H, Q, S, T, K) to Premium Economy Class	Economy Class (G, V, W) to Premium Economy Class	Premium Economy Class (U) to Royal Silk Class	Royal Silk Class (C, D, J) to Royal First Class
1	Destinations up to 1,000 miles: Between Bangkok and: Chittagong, Dhaka, Hanoi, Ho Chi Minh City,Kuala Lampur, Kunming, Penang, Phnom Penh, Singapore, Vientiane, Yangon	16,000 UYI1	20,000 UEI1	22,000 UGI1	12,000 UEL1	14,000 UGL1	15,000 UUI1	N / A
2	Destinations from 1,001 - 2,000 miles: Between Bangkok and: Bandar Seri Begawan, Bangalore, Chennai, Chengdu, Colombo, Denpasar, Guangzhou, Hong Kong, Hyderabad, Jakarta, Kathmandu, Kolkata, Manila, Mumbai, New Delhi, Shanghai, Taipei, Xiamen	20,000 UYI2	25,000 UEI2	27,000 UGI2	17,000 UEL2	22,000 UGL2	19,000 UUI2	35,000 UCO2
3	Destinations from 2,001 - 3,600 miles: Between Bangkok and: Beijing, Busan, Dubai, Fukuoka, Islamabad, Karachi, Kuwait, Lahore, Muscat, Nagoya, Osaka,Perth, Seoul, Tokyo	24,000 UYI3	30,000 UEI3	35,000 UGI3	20,000 UEL3	28,000 UGL3	22,000 UUI3	40,000 UCO3
4	Destinations from 3,601 - 4,800 miles: Brisbane, Melbourne, Moscow, Sydney	28,000 UYI4	35,000 UEI4	40,000 UGI4	23,000 UEL4	32,000 UGL4	25,000 UUI4	45,000 UCO4
5	Destinations from 4,801 - 8,000 miles: Between Bangkok and: Athens, Auckland, Copenhagen, Frankfurt, Johannesburg, London, Madrid, Milan, Munich, Paris, Rome, Stockholm, Zurich	32,000 UYI5	40,000 UEI5	50,000 UGI5	25,000 UEL5	42,000 UGL5	28,000 UUI5	50,000 UCO5
6	Destinations from 8,001 - 12,500 miles: Between Bangkok and: Los Angeles	40,000 UYI6	50,000 UEI6	65,000 UGI6	30,000 UEL6	52,000 UGL6	35,000 UUI6	60,000 UCO6