This route serves:
- Luton Airport
- Luton
- Dunstable
- Tilsworth
- Stanbridge
- Heath and Reach (school journey only - route X15)
- Leighton Buzzard
- Wing
- Kingsbrook
- Aylesbury
Traveline timetable
View the timetable for Arriva route X4 (valid from 6 July 2026 while Stanbridge Road is closed)
View the timetable for Arriva school days route X15
Changes to this service
Route X4 serves Leighton Buzzard High Street all day on Monday, Wednesday to Friday and Sunday, and after 7pm on Tuesday and Saturday. Until 7pm on Tuesday and Saturday, buses serve West Street.
From 6 July 2026, route X4 is on diversion due to a road closure on Stanbridge Road. Buses will not serve stops on Leighton Road, Stanbridge Road or at Lake Street / Morrisons, and will divert via Fraserfields Way and Hockliffe Road.
The diversion is expected to remain in place until early September.