Members of THAI Airways Royal Orchid Plus program can enjoy a 25% discount on mileage based upgrades. The offer is applicable to all classes that are eligible for upgrades and range from as a low as 9,000 Royal Orchid miles one way to upgrade from Economy to Premium Economy for shorter haul flights to as high as 51,750 miles one way to upgrade from Royal Silk Class to Royal First Class on the Bangkok-Los Angeles route. This offer runs until the end of September
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