Please login to the online KSRTC portal
For an example, Select source as Trivandrum and Destination as Bangalore.
click on Find Buses
scheduled details will show down
Click on the link ( Today Or Next 21 Days ) to get the seat availability page
Select the date and click on View Bus
Now Select your seat by clicking the check boxes
Select Journey from option and To option
click the book ticket button.
Confirm the schedule details and charges.
Click on go to payment button and enter the card details and click submit.
Now you can take the printout of the ticket you have booked.
Kerala State Road Transport Corporation
KSRTC TICKET ONLINE