From my findings, the last timetabled trip under the Eastern suburbs/pre-Airport Line bus network is the 380T departing the city at 11:45PM/2345 on the 9th October. I hope this list would be a benefit for other enthusiasts.
8th October
294
- Midland to Westfield Carousel: 3:30PM/1530 - 4:35PM/1635
- Westfield Carousel to Midland: 3:55PM/1555 - 4:56PM/1656
- Westfield Carousel to Hale Rd/Hartfield Pk: 5:55PM/1755 - 6:14PM/1814
- Midland Station to Hillview Village: 4:00PM/1600 - 4:18PM/1618
- Hillview Village to Midland Station: 4:23PM/1623 - 4:40PM/1640
36
- Midland to Perth CBD: 6:39PM/1839 - 7:16PM/1916
- Perth CBD to Midland: 7:40PM/1940 - 8:19PM/2019
- Perth Airport to Perth CBD: 10:05PM/2205 - 10:34PM/2234
- Perth CBD to Perth Airport: 11:20PM/2320 - 11:49PM/2349
- Hawtin Rd/Berkshire Rd (Forrestfield Village) to Perth CBD: 6:34PM/1834 - 7:21PM/1921
- Perth CBD to Hawtin Rd/Berkshire Rd (Forrestfield Village): 7:30PM/1930 - 8:21PM/2021
- Kalamunda Bus Station to Perth CBD: 4:05PM/1605 - 4:56PM/1656
- Perth CBD to Kalamunda Bus Station: 6:00PM/1800 - 6:56PM/1856
- Kalamunda Bus Depot to Perth CBD: 1:00PM/1300 - 1:57PM/1357
- Kalamunda Bus Station to Perth CBD: 6:12PM/1812 - 6:56PM/1856
- Perth CBD to Kalamunda Bus Depot: 7:00PM/1900 - 7:56PM/1956
- Perth Airport to Perth CBD: 11:07PM/2307 - 11:39PM/2339
- Perth CBD to Perth Airport: 11:45PM/2345 - 12:17AM/0017