Yes, Royal Orchid Plus members can earn miles and redeem tickets with THAI Smile. Any THAI Smile flights that are less than 500 miles will automatically earn members 500 miles. Mileage Accrual Chart by RBD
Service Class WE Booking Class Miles Factor Fare Type
Premium Economy U, A, P 110% Smile Plus
Economy Y, B, M, H, Q, V, W, T 100% Smile Flexi
Economy (Domestic) K, S, Z, O 50% Smile Saver
Economy (International) K, S, Z, O 25% Smile Saver
Economy T, K, S, Z, O 0% Smile Promotion
However, sponsor and barter air ticket is not eligible for mileage accrual.