First 423 Bus: Start of Service
The first 423 of the day from every stop on the route
Up early for a flight or an early shift? The first 423 bus of the day leaves School Road at 03:20 towards Heathrow Terminal 5 (Mon-Fri). The tables below show the scheduled first 423 departure from every stop, in each direction, for each day of the week. Stop names link to the full 423 timetable with every departure of the day.
To Heathrow Terminal 5
| Stop | Mon-Fri | Sat | Sun |
|---|---|---|---|
| School Road C | 03:20 | 03:20 | 03:20 |
| Fair Street H | 03:21 | 03:21 | 03:21 |
| Douglas Road HH | 03:22 | 03:22 | 03:22 |
| Treaty Centre S | 03:24 | 03:24 | 03:24 |
| The Bell W | 03:26 | 03:26 | 03:26 |
| Hibernia Road | 03:27 | 03:27 | 03:27 |
| Wellington Road South M | 03:29 | 03:29 | 03:29 |
| Staines Road / Martindale Road N | 03:30 | 03:30 | 03:30 |
| Barrack Road | 03:32 | 03:32 | 03:32 |
| Cardington Square JJ | 03:32 | 03:32 | 03:32 |
| Dukes Avenue | 03:33 | 03:33 | 03:33 |
| Cavalry Barracks | 03:34 | 03:34 | 03:34 |
| Beavers Crescent | 03:35 | 03:35 | 03:35 |
| Basildene Road | 03:36 | 03:36 | 03:36 |
| Beavers Community School | 03:37 | 03:37 | 03:37 |
| Lichfield Road | 03:38 | 03:38 | 03:38 |
| Green Lane | 03:38 | 03:38 | 03:38 |
| Girling Way | 03:42 | 03:42 | 03:42 |
| Great South West Road J | 03:44 | 03:44 | 03:44 |
| Hatton Cross Station E | 03:46 | 03:46 | 03:46 |
| Envoy Avenue K | 03:46 | 03:46 | 03:46 |
| Cranford Lane | 03:50 | 03:50 | 03:50 |
| Hatton Road North M | 03:53 | 03:53 | 03:53 |
| Harlington Corner J | 03:53 | 03:53 | 03:53 |
| Mondial Way BL | 03:55 | 03:55 | 03:55 |
| Sipson Road BP | 03:56 | 03:56 | 03:56 |
| Bath Road / Newport Road BT | 03:57 | 03:57 | 03:57 |
| Compass Centre BW | 03:58 | 03:58 | 03:58 |
| Pinglestone Close H | 03:59 | 03:59 | 03:59 |
| Heathrow Park Thistle Hotel J | 04:00 | 04:00 | 04:00 |
| Heathrow Close K | 04:02 | 04:02 | 04:02 |
| Heathrow Terminal 5 1 | 04:05 | 04:05 | 04:05 |
To Hounslow Bus Station
| Stop | Mon-Fri | Sat | Sun |
|---|---|---|---|
| Heathrow Terminal 5 6 | 04:05 | 04:05 | 04:05 |
| The Square E | 04:10 | 04:10 | 04:10 |
| Heathrow Park Thistle Hotel F | 04:11 | 04:11 | 04:11 |
| Pinglestone Close G | 04:14 | 04:14 | 04:14 |
| Compass Centre BA | 04:15 | 04:15 | 04:15 |
| Newport Road BB | 04:16 | 04:16 | 04:16 |
| Sipson Way / Blunts Avenue BC | 04:17 | 04:17 | 04:17 |
| Nene Road BJ | 04:18 | 04:18 | 04:18 |
| Bolton's Lane BK | 04:20 | 04:20 | 04:20 |
| New Road D | 04:21 | 04:21 | 04:21 |
| Hatton Road North K | 04:22 | 04:22 | 04:22 |
| Eastchurch Road | 04:24 | 04:24 | 04:24 |
| Envoy Avenue M | 04:28 | 04:28 | 04:28 |
| Hatton Cross Station B | 04:29 | 04:29 | 04:29 |
| Girling Way | 04:32 | 04:32 | 04:32 |
| Green Lane | 04:35 | 04:35 | 04:35 |
| Lichfield Road | 04:36 | 04:36 | 04:36 |
| Beavers Community School | 04:37 | 04:37 | 04:37 |
| Basildene Road | 04:38 | 04:38 | 04:38 |
| Beavers Crescent | 04:39 | 04:39 | 04:39 |
| Cavalry Barracks | 04:40 | 04:40 | 04:40 |
| Dukes Avenue | 04:41 | 04:41 | 04:41 |
| Barrack Road | 04:42 | 04:42 | 04:42 |
| Frampton Road C | 04:43 | 04:43 | 04:43 |
| Martindale Road D | 04:44 | 04:44 | 04:44 |
| Cranbrook Road E | 04:45 | 04:45 | 04:45 |
| Wellington Road South F | 04:46 | 04:46 | 04:46 |
| Hibernia Road | 04:48 | 04:48 | 04:48 |
| The Bell V | 04:50 | 04:50 | 04:50 |
| Treaty Centre P | 04:50 | 04:50 | 04:50 |
| Hounslow High Street K | 04:52 | 04:52 | 04:52 |
| Hounslow Bus Station Z1 | 04:54 | 04:54 | 04:54 |
Times are TfL's scheduled first departures from each stop in the given direction; the final stop's time is an arrival. Columns cover the days shown in their heading, and the highlighted column is today. On busy mornings buses can run a few minutes later than scheduled, so allow a small buffer if the first bus matters for a connection.
First 423 bus 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 tables above for the first bus from any stop on the route.
What time is the first 423 bus on a Sunday?
On Sundays the first 423 bus leaves School Road at 03:20. Sunday service usually starts later than on weekdays, so check the Sun column above for your stop.
Where does the first 423 bus start from?
The 423 starts from School Road and runs to Heathrow Terminal 5, and in the other direction from Heathrow Terminal 5. Buses reach stops along the route a few minutes after leaving the start, and the tables above show the scheduled first departure at every stop.
Planning the other end of the day?
See every 423 departure and the last bus from your stop, or check live arrivals while you wait.
Full 423 timetable → Live 423 arrivals →