Thiruvananthapuram, Cochin, Kannur, Kozhikode are connected with Bengaluru
Four airports from north to south of Kerala is directly connected with Bangalore
Next best frequent connection is with Trivandrum ( Thiruvananthapuram) . There are 5 direct flights from Bangalore to Trivandrum (90 minutes flight time).
There are also regular connections between Kannur, Kozhikode and Bangalore.
Check with booking portals like Makemytrip, Goibibo or Cleartrip to find the latest connection options. Major operators like AirAsia, Vistara, GoAir etc operate daily flights.