They have been bailed until 9 November, pending further inquiries the NCA said.
Officers also found electronic trackers with the drugs in some cases, believed to have been placed by organised criminals to follow the loads.
More than half of all those arrested in 2023 had flown in from US airports, 24 from Thailand and 24 from Canada.
The same locations are prominent again this year, with about half of all arrests (184) relating to cannabis originating in Thailand.
More than 70 arrests were on flights from Canada, and 47 from the US.
The maximum sentence for cannabis importation in the UK is up to 14 years in prison, the NCA has warned.
