London Bus 423 Timetable
First bus, last bus and departure times at every stop
This is the full timetable for the number 423 bus in London, which runs between School Road and Heathrow Terminal 5. The table shows the first bus, the last bus and how often the 423 runs from each of the 32 stops in each direction. Times below are for buses towards Heathrow Terminal 5 (Mon-Fri). Use the toggles to switch direction or day, and tap any stop for its full hour by hour departure list.
This page shows TfL's scheduled times for the 423. Waiting at a stop right now? See live arrivals and the route map for bus 423 instead.
Tap any stop to see every scheduled departure, hour by hour, plus a link to its live arrivals.
Full 423 timetable from School Road (Mon-Fri)
Every scheduled 423 bus departure from School Road towards Heathrow Terminal 5, Mon-Fri. For other days, use the day buttons above or tap any stop in the table.
Full 423 timetable from Heathrow Terminal 5 (Mon-Fri)
Every scheduled 423 bus departure from Heathrow Terminal 5 towards Hounslow Bus Station, Mon-Fri. For other days, use the day buttons above or tap any stop in the table.
First and Last are the earliest and latest scheduled departures from each stop in the chosen direction. Every is the typical daytime interval between buses from 07:00 to 19:00; buses may be more frequent at peak times and less frequent early and late. Times at the final stop are arrivals. Times at stops along the route are TfL's scheduled running times from the start of the route, so on busy days buses can run a few minutes later. Tap a stop row for its full list of departures. All times come from Transport for London's timetable data.
Source: TfL Timetable API
Bus 423 timetable FAQs
What time is the first 423 bus?
The first 423 bus leaves School Road at 03:20 towards Heathrow Terminal 5 (Mon-Fri). From Heathrow Terminal 5 the first bus is at 04:05. Use the table above for the first bus from any stop on the route.
What time is the last 423 bus?
The last 423 bus leaves School Road at 00:10 towards Heathrow Terminal 5 (Mon-Fri). From Heathrow Terminal 5 the last bus is at 00:50. Tap any stop in the table above to see its exact last departure.
How often does the 423 bus run?
During the day the 423 typically runs about every 20 minutes. Buses can be more frequent at peak times and less frequent early in the morning and late in the evening.
Does the 423 bus run on Sundays?
Yes. On Sundays the 423 runs from 03:20 until 00:10 from School Road. Use the Sun button above to see full Sunday times.