I will be transiting PEK from IAD (UNITED 807) to BKK (THAI 615). What are my directions?

May I know if you hold the through ticket? If so, also confirm if the United Airlines have the luggage check through service. If so, your time can be enough for transfer and all procedures can be finished within the transfer area, without need to collect and reclaim your luggage. And no China visa is needed for the transfer.

Here are the procedures: Flight Arrival - Transfer Procedures - Border Inspection - Security Check - Custom Inspection - Waiting & Boarding

Have a smooth trip!