The 34-year-old rapper and five other men were arrested on charges of violent disorder and starting a brawl, and spent the night in jail, after trouble flared when some of Snoop's party were denied entry to British Airways' first-class lounge.
The group had been en route to Johannesburg, South Africa, where Snoop, whose real name is Calvin Broadus, was due to perform. They clashed with officials after some were told they didn't have the correct tickets to enter the lounge.
Police released the six, all U.S. citizens in their 30s, saying they had not been charged with any offenses. The men were told they had to return after further investigations had been carried out.
Snoop was to meet officers at Heathrow police station to see whether any action would be brought against him. Police said seven officers were injured in the brawl.
A spokesman for British Airways said Snoop has been banned from future travel on the airline.