United MileagePlus members can earn up to 15,000 bonus miles for roundtrip nonstop travel between San Francisco and Chengdu from June 9, 2014 through Aug. 31, 2014.

United MileagePlus members must first register for the promotion HERE, and registration must be completed by Aug. 31, 2014. The promotion is valid for travel from June 9, 2014 through Aug. 31, 2014.

The promotion is valid for roundtrip nonstop flights operated by United or United Express, and the amount of bonus you will receive is based on fare class. There is no limit to the number of bonuses you can earn during the promotion period. Members can earn:

– 5,000 bonus miles for discounted economy (E, U, H, Q, V, W, S, T, L, K, G, N fare classes)
– 10,000 bonus miles for economy (Y, B, M fare classes)
– 15,000 bonus miles for BusinessFirst (J, C, D, Z, P fare classes)

INSIDE|Point: MileagePlus members will earn half the amount of bonus miles if only flying one-way.