U.S. Customs clearance services are available at Tulsa International Airport. After hours clearance can be arranged as long as the Customs office knows of an arrival by 2:00 p.m. on the same day. Weekend arrivals need to be arranged by Friday at 2:00 p.m. Charter flights can be cleared with 20 or fewer people on board, including crew, as long as the carrier is bonded with Customs and Border Protection. Clearance takes place on the aircraft. To arrange for clearance, call 918-832-4130.