There is a bus stop with a shelter at the end of the Promenade, on the side of the Primary School ( Scoill Phurt le Moirrey). Buses run to Castletown, the Airport and Ballsalla and Douglas via Port Erin or Shore Rd [most buses continue along the Prom in Douglas to the Electric Railway and Onchan].
Monday to Saturdays for most of the day there are two buses an hour to Douglas. One turns right and goes via Shore Rd, Gansey. The other goes via Port Erin and Colby. Both routes join just before Castletown.  Sundays are similar to the Monday to Saturdays timetable but with slightly less buses in the early morning.
A summary of buses between Port St Mary and Douglas is below.

Also the number 28 runs to the Sound and Port Erin.  This runs on Saturdays and Sundays between 17th June and 3rd September.

TT Bus Services
This year on race days a special service will operate from Port St Mary to the Grandstand and the TT course.

Service TT7 departs Port St Mary via Port Erin, Shore Road, Castletown By Pass and Ballasalla to the Grandstand. This bus then operates the TT6 journey from the Grandstand via the TT Course to Ramsey. The only stops for boarding in Port St Mary are the harbour shelter and Port St Mary school layby. The ONLY on-bus fares on this service are either a 1 day Go Saver or 1 day Go Explore ticket. Preloaded GO Saver and GO Explorer are valid.  For return use the TT6  to Douglas then standard services back South.

Saturday 3, Tuesday 6, Wednesday 7, Friday 9 and Saturday 10 June - Roads close 1000 depart Port St Mary at 07:30

Sunday 4 June - Roads close 1230 depart Port St Mary at 10:00.

For more information on all TT Bus Services please click here

Southern 100 Races

When the Billown Circuit (Southern 100) Castletown to Ballabeg is in use, buses will only run between Douglas, the Airport and the Square in Castletown (passing the Steam Railway Station). There will be some buses operating between Douglas and Port St Mary via Foxdale (not serving the Airport, Castletown or Ballasalla).

The Steam Railway will operate as normal.

Isle of Man Steam Packet Company Southern 100 Road Races: 10th, 11th, 12th and 13th July

All buses are run by Bus Vannin
Check the Bus Vannin facebook page for last minute changes to schedule

Steam Railway

The Steam Railway Station is a 10 minute walk from Mallmore in the Port Erin direction.  Trains run most days between March and October.  Generally there 4 journeys each way and on occasions 6.  During TT race week a commuter service with restaurant car runs.
More information here.

The Manx Electric Railway and Snaefell Mountain Railway

The Manx Electric Railway (MER) starts at Derby Castle at the north end of Douglas Promenade.  The MER travles through the lovely Manx countryside to Laxey and Ramsey.  At Laxey the Snaefell Mountain Railway runs to the summit of Snaefell.
Most of the Douglas buses from Port St Mary travel along Douglas Promenade to Derby Castle.  Alternatively take the Steam train to Douglas, walk along to the Promenade and catch a bus to Derby Castle.
More information here.