Train
Kannapuram (KPQ)Kayankulam Jn (KYJ)
12432 Delhi H Nizamuddin–Trivandrum Rajdhani Express · 3A · 412 km
₹930–₹1,090
6.9h
Train
Kayankulam Jn (KYJ)Nalhati Jn (NHT)
12508 Guwahati–Trivandrum SF Express · 3A · 2520 km
₹4,300–₹4,990
20.9h
Shared jeep
Nalhati JnKrishnapur
Shared Sumo/Bolero · 59 km
Shared jeeps leave the stand between 05:00 and 07:00 and then stop for the day. Be early or lose a day.
₹170–₹300
2.6h
Total for 1 traveller: ₹5,450–₹6,490 one way
Does this look right?

