From Exeter, the 9A operates hourly via Sidmouth. All the bus services stop at Seaton Sea Front, which is convenient for the town centre. For Seaton Jurassic get off at Underfleet. Other links to Seaton include the 9A from Sidmouth, 20 from Honiton and Taunton and 9A from Lyme Regis.
Service 899 also serves Seaton from Sidmouth and Beer (and stops at Sidford, Branscombe, with some journeys passing Beer Quarry Caves.
Service 885 serves Seaton, Colyford, Colyton, Musbury and Axminster (calling in at Axminster Station)
If you are travelling from further afield, take the bus or train to Exeter and then catch one of the services listed above.