The ferry journey is approximately 2 Hours.  The timetable is complicated, and changes in winter. Check which port on Islay you are heading for/from as this can vary. A summary is as follows, with highlighted  times being:

Basic Timetable

Monday to Saturday, except  Wednesday/Sunday

 To Islay:

From Kennacraig  07.15, 12.50, 18.00

From Islay

04.30 (Saturday)  09.55,  15.30, 20.15 (Monday/Thursday)

Sunday only

From  Islay 09.55 15.35

From Kennacraig 12.50

Wednesday only

10.40    Port Askaig to Oban, Via Colonsay, Summer only

Oban 15.15 to Port Askaig, via Colonsay Summer only

From  Kennacraig 08.15

From  Islay 05.30,  19.45

Car Ferry Reservations Tel: +44 (0)8705 650000

Islay Tourist Office Tel: +44 (0) 1496 810254