Direct bus services are available from Bangalore to Munnar
Other pickup points are KMF (Opposite to Christ College), St Johns Hospital (BMTC Bus Stand), Opp. Hosur Bus Stand.
The return trip starts at 5PM from Munnar are reaches Bangalore at 6.30AM
This bus to Munnar is the Rajahamsa Executive class service. Ticket costs Rs 540. You can check availability , schedule and book tickets online at www.ksrtc.in
KSRTC (Kerala RTC) operates a daily bus (Super Delux Air Bus type) between Bangalore and Munnar.
Leaves Bangalore at 4PM and reaches Munnar by 7.30AM. The return bus leaves Munnar at 3.30PM and reaches Bangalore at 7.30AM. Fare Rs755. You can book the bus ticket online at ( www.keralartc.com/html/ticketbooking.html)
There are also other private operators like Kallada Travels, KPN, SRS Travels etc operate daily bus trips to Munnar from Bangalore. Many of the private bused operate from Madiwala in Bangalore. Check out their websites for online bus booking details. Fare is a bit higher for the private operators compared to the the KSRTC services.
Aslo check with RedBus portal/app for booking tickets with private bus operators between Bangalore and Munnar.
Check out other travel options from Bangalore to Munnar, especially the road routes with driving directions.
Bangalore to Munnar via Salem-Bhavani: Distance 480km
Bangalore to Munnar via Mysore & Ooty: Distance 560km.
Dindigul-Theni Route ( Munnar from Bangalore via Dindigul: Distance 550km