You can reach Thrissur by bus from select locations such as Bangalore, Trivandrum, Mumbai, Coimbatore, Kannur, Kozhikode, Kochi etc. There are various private and Government buses that provide these services. This might prove to be more expensive and may not make for a comfortable journey.
Head west on Joithe Ram Linghm St toward Dasathapuram/Rutland Gate 6th St
Turn left at Chaitanya State Emporium onto Nungambakkam High Rd
At the roundabout, take the 3rd exit
Slight left onto Anna Salai
At church, continue onto Taluk Office Rd
Keep right to stay on Taluk Office Rd
Continue onto Sardar Patel Rd
Continue onto Anna Salai
Continue onto Grand Southern Trunk Rd
At Tambaram Junction, continue onto Nagapattinam-Chennai Hwy/NH 45/Tiruchi-Chennai Hwy
Slight right onto Tiruchi-Chennai Hwy/NH 132/NH 45
Turn right onto Salem-Ulundurpettai Hwy/NH 68
Sharp left onto NH 68
Take the 1st left to stay on NH 68
Turn left onto Salem-Ulundurpettai Hwy/NH 68
Turn right to stay on Salem-Ulundurpettai Hwy/NH 68
Slight right to stay on Salem-Ulundurpettai Hwy/NH 68
Slight left onto Sankari Main Rd
Slight left onto Service Road
Slight left onto Salem-Ernakulam Hwy
Turn right to stay on Salem-Ernakulam Hwy
Turn left onto Coimbatore Rd/Trichy Rd/NH 67
Sharp right at Sre Saravana Bhavan to stay on Coimbatore Rd/Trichy Rd/NH 67
Take the 1st left onto Salem-Ernakulam Hwy
Turn left to stay on Salem-Ernakulam Hwy
Turn right onto Trichur-Palghat Rd
Turn left at ACTS onto Swaraj Round E
Turn left at Bini Tourist Home onto Shoranur - Thrissur Rd