After MRT Circle Line, MRT East West Line will be the first transit line from west Klang Valley to east. Hopefully they can submit the proposal to cabinet after MRT2 completion.

Estimated public display: May 2021
Estimated construction start: June 2022
Estimated construction end:
- Phase 1 (Elevated) (Kota Kemuning - Puchong Hartamas) 2nd quarter 2027
- Phase 2 (Underground) (Saujana Puchong - Balakong Jaya) 2nd quarter 2028
- Phase 2 (Elevated) (Setia Balakong - Sungai Long) 2nd quarter 2028

Estimated Stations:
- Phase 1 (Elevated):
1. Kota Kemuning (Interchange with future LRT Johan Setia Line and future BRT Shah Alam Line)
2. Alam Indah
3. Taman Perindustrian HICOM
4. Pinggiran USJ
5. USJ13
6. USJ21 (Interchange with LRT Kelana Jaya Line)
7. USJ23
8. Puchong Batu 13
9. Sri Puchong
10. Puchong Intan
11. Taman Perindustrian Puchong (Interchange with LRT Sri Petaling Line)
12. Puchong Indah
13. Puchong Utama
14. Puchong Hartamas
- Phase 2 (Underground):
15. Saujana Puchong
16. Lestari Puchong
17. Lestari Perdana
18. Puncak Jalil (Interchange with future BRT OUG Line)
19. Bukit Serdang
20. Taman Jinma
21. Seri Kembangan (Interchange with MRT SSP Line)
22. Serdang Jaya
23. Serdang (Interchange with KTM Seremban Line and future BRT Alam Damai Line)
24. Sri Serdang
25. Desa Serdang
26. Balakong Jaya
- Phase 2 (Elevated):
27. Setia Balakong
28. Impian Ehsan
29. Cheras Jaya
30. Cheras Selatan
31. Cheras Perdana
32. Bandar Tun Hussien Onn (Interchange with MRT SBK Line)
33. Mahkota Cheras
34. Sungai Long