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[#bar]  For northern parts of Kerala (Kannur, Kasargod, Kozhikode, Malappuram , Wayanad etc) , travel via Mysore. First travel to Mysore from Bangalore on NH275. From Mysore there are a few popular routes to Kerala.  Two popular ones are either via Gundlupet for Kozhikode or Wayanad. And via Virajpet for Kannur.

[#bar]  For Kottayam , Munnar , Kollam etc travel on NH44 till Dindigul or Madurai and take the diversion towards Kerala

[#bar]  Thiruvananthapuram, the southernmost city in Kera can be reached via Tirunelveli on NH44.

See the major road trip routes to Kerala from Bangalore  .

Also road routes from Bangalore to Munnar | Bangalore to Guruvayur |Bangalore to Sabarimala  | Bangalore to Ernakulam |  Bangalore to Kannur | Bangalore to Wayanad

[#train]

Bangalore to Kerala Trains :

Train No.6527 Yeshwantpur-Cannanore Express on Monday, Wednesday and Saturday from Bangalore. This train goes to the north part of Kerala via Tamilnadu. If you are traveling to south of Kerala , like Cochin, change train at Palakkad or Shornur .

Route of Train No.6527 : Yesvantpur Jn - Hosur -Dharmapuri - Salem Jn - Erode Jn - Palakkad - Shoranur Jn - Tirur - Kozhikkode - Vadakara - Thalassery - Kannur

There are seven trains from Bangalore that run southward in Kerala. Out of it two are daily trains, that is the Bangalore-Ernakulam Express (Train No: 2677 ) and Bangalore-Kanyakumari Express ( Train No: 6526).

Route of Train No: 6526 : Bangalore city - Bangalore Cant - Krishnarajapurm - Whitefield - Malur - Bangarapet - Kuppam - Tirupattur Jn - Salem Jn - Erode Jn - Tiruppur - Coimbatore Jn - Palakkad - Ottappalam - Wadakancheri - Thrisur - Pudukad - Irinjalakuda - Chalakudi - Angamali - Aluva - Ernakulam Town - Piravam Road - Kottayam - Changanaseri - Tiruvalla - Chengannur - Mavelikara - Kayankulam Jn - Karunagapalli - Kollam Jn - Paravur - Varkala - Kadakavur - Chirayinkil - Trivandrum Pett - Trivandrum Cntl - Neyyattinkara - Dhanuvachapuram - Parashshala - Kulitturai West - Kulitthurai - Palliyadi - Eraniel - Nagercoil Jn - Kanyakumari

[#flight]
Bangalore to Kerala flights :

Ernakulam (Kochi/Cochin) is the best connected city with Bangalore.

About 10-12  pairs of flights are operated daily between Cochin and Bangalore .

There are 3 direct flights from Bangalore to Trivandrum (1 hour 30 minutes).

Also there are a few flights daily to Kannur & Kozhikode.

Flight time is typically just over an hour for any cities in Kerala, Thiruvananthapuram is the longest (1hr 30min)