Their website sucks. [as on January 25th 2009].

And collecting information from different sources was NOT fun.

So here I am assimilating all steps at one place:

For routes:
http://www.btis.in/airport#
or

http://www.flickr.com/photos/rednivaram/2541783270/

For timings:
From airport to Bangalore, here’s the pic:

http://www.flickr.com/photos/rednivaram/2540963595/

from Bangalore to airport, there’s no website. I called up Just Dial (080 23333333) and they mailed me this info:

Building : Bangalore International Airport
Area : Devanahalli
Pin : 562110
Tel. : 22952422, 22952522, 12667
Mobile : 9480815422, 9480815799, 9480816800
Extra Info: Route Numbers With Timings** Towards Bangalore International Airport Dedicated Bus Service Vayu Vajra & Suvarna
=======================================

Bus Tariff:

A.C. Vayu Varja : Four Flat Fares Of Rs. 200/-, 150/-, 125/-, 100/- .
Non A.C. Suvarna : Three Flat Fares Of Rs. 100/-, Rs. 80/- & Rs. 50/
=======================================

Bus	From	To
bias 1	Hebbal Ring Road	Bangalore International Airport
bias 2	Mysore Road Satellite Bus Stand	Bangalore International Airport
bias 3	Jeevan Bhima Nagar	Bangalore International Airport
bias 4	Hal Old Airport	Bangalore International Airport
bias 5	J P Nagar 6Th Ph	Bangalore International Airport
bias 6	Kadugodi Bus Station	Bangalore International Airport
bias 7	Koramangala	Bangalore International Airport
bias 8	Electronic City	Bangalore International Airport
bias 9	Kempegowda Bus Station	Bangalore International Airport
bias 11	Chikkalasandra Bus Stand	Bangalore International Airport
bias 12	Kuvempu Nagar (Btm Lyt)	Bangalore International Airport

bias-1
bial To Hebbala
departure From :Bangalore International Airport

0650 0715 0740 0805 0830 0920 0945 1030
1055 1120 1125 1210 1235 1300 1325 1350
1415 1440 1505 1550 1615 1640 1705 1730
1755 1820 1845 1910 1935 2000 2025 2110
2135 2200 2225 2250 2315 2340 0005 0210
0235 0300 0350 0415 0440

hebbala To Bial
0600 0625 0650 0715 0740 0805 0830 0855
0920 1010 1035 1120 1145 1210 1235 1300
1325 1350 1415 1440 1505 1530 1555 1640
1705 1730 1755 1820 1845 1910 1935 2000
2025 2050 2135 2200 2225 2250 2315 0120
0145 0210 0300 0325 0350

bias-2
bial To Mctc Bus Stand
departure From :Bangalore International Airport

0600 0700 0800 0900 1000 1100 1200 1300
1400 1500 1600 1700 1800 1900 2000 2100
2200 2300 2400 0100 0200 0300 0400

mctc Bus Stand To Airport

0600 0700 0800 0900 1000 1100 1200 1300
1400 1500 1600 1700 1800 1900 2000 2100
2200 2300 2400 0100 0400 0500

bias-3
bial To Jeevanbhimanagara
departure From :Bangalore International Airport

0600 0615 0630 0645 0650 0715 0735 0755
0810 0825 0840 0910 0925 0940 1010 1025
1035 1105 1120 1135 1220 1235 1245 1320
1335 1335 1420 1435 1445 1515 1530 1545
1615 1630 1645 1700 1745 1800 1825 1845
1855 1925 1940 1950 2020 2035 2050 2120
2135 2145 2300 2335 2350 2400 0045 0130
0230 0300 0410 0440 0510 0525 0545

jeevanbhima Nagara To Bial

0615 0630 0645 0715 0730 0745 0830 0845
0900 0910 0925 0940 1025 1040 1055 1125
1140 1155 1205 1225 1240 1250 1320 1335
1345 1435 1450 1500 1535 1550 1605 1635
1650 1700 1730 1745 1755 1825 1840 1855
1925 1940 1950 2020 2050 2120 2135 2150
2230 2330 0045 0100 0145 0225 0255 0325
0340 0355 0410 0425 0440 0455 0510 0525
0550

bias-4
bial To Hal
route No.bias-4 Bial To Hal Old Airport departure From Bial

0500 0600 0700 0800 0900 1000 1100 1200
1300 1400 1500 1600 1700 1800 1900 2000
2100 2200 2300 2400 0100 0200 0300

hal To Bial

0500 0600 0700 0800 0900 1000 1100 1200
1300 1400 1500 1600 1700 1800 1900 2000
2100 2200 2300 2400 0100 0300 0400

bias-5
bial To J.p. Nagar 6Th Phase
departure From Bangalore International Air Port

0610 0625 0640(V) 0655 0710 0725 0740V 0820(V)
0835 0850 0905 0920(V) 0935 0950 1005 1020(V)
1035 1050 1105 1120(V) 1135 1150 1205 1220(V)
1235 1320(V) 1350 1405 1420(V) 1435 1450 1505
1520(v) 1535 1550 1605 1620(V) 1635 1650 1705
1720(v) 1815 1830 1845 1915 1930 1945 2015
2045 2115 2145 2215 2300(V) 2315 2400(V) 0015
0045 0100(V) 0015 0130 0200(V) 0230 0300(V) 0340
0410 0440(V) 0510 0540(V)

j.p. Nagar 6Th Phase To Bial

0600(v) 0615 0630 0645 0700(V) 0715 0730 0745
0800(v) 0815 0830 0845 0900(V) 0915 0930 0945
1000(v) 1100(V) 1115 1130 1145 1200(V) 1215 1230
1245 1300(V) 1315 1330 1345 1400(V) 1415 1430
1445 1500V 1515 1610 1625 1655 1710 1725
1755 1825 1855 1925 2040(V) 2055 2125 2140(V)
2155 2225 2240(V) 2255 2310 2340(V) 0005 0040(V)
0120(v) 0150 0220(V) 0250 0320(V) 0350 0405 0420(V)
0435 0450 0505 0520(V)

bias-6
bial To Kadugodi Bus Station
departure From Bial

0440 0540 0640 0740 0830 0930 1030 1130
1230 1430 1530 1630 1730 1830 1930 2030
2130 2230 2330 0045

kadugodi
0600 0700 0800 0900 1000 1100 1200 1300
1400 1500 1655 1745 1855 2000 2055 2145
2245 2400 0100

bias-6
bangalore International Air Port To Kadugodi Bus Station
departure From Bial

0440 0540 0640 0740 0830 0930 1030 1130
1230 1430 1530 1630 1730 1830 1930 2030
2130 2230 2330 0045

departure From Kadugodi
0600 0700 0800 0900 1000 1100 1200 1300
1400 1500 1655 1745 1855 2000 2055 2145
2245 2400 0100

bias-7
bangalore International Air Port To Koramangala
departure From Bangalore International Air Port

0600 0630 0700 0730 0800 0830 0900 0930
1020 1050 1120 1150 1220 1250 1320 1350
1420 1450 1520 1550 1620 1650 1720 1750
1820 1850 1920 1950 2020 2110 2120 2150
2240 2310 2400 0040 0130 0220 0345 0430

departure From Koramangala

0610 0640 0700 0735 0820 0850 0920 0950
1020 1050 1120 1150 1220 1250 1320 1350
1420 1450 1520 1550 1620 1650 B 1750
1820 1910 1920 1950 2040 2110 2140 2210
2230 2300 2330 2400 0420 0450 0525 0540

bias-8
bangalore International Airport To Electronic City
departure From :Bangalore International Airport

0310 0500 0625 0715 0800 0840 0925 1010
1055 1135 1240 1355 1445 1535 1620 1705
1745 1825 1935 2015 2100 2145 2230 2315
2355 0040

departure From :Electronic City

0110 0200 0300 0505 0550 0630 0730 0815
0855 1010 1105 1220 1305 1350 1430 1530
1630 1745 1830 1915 2015 2115 2230 2330
0040

bias-9
bangalore International Air Port To Kempegowda Bus Station
departure From Bangalore International Air Port

0615 0725 0755 0825 0925 0855 0925 0945
1015 1045 1115 1145 1215 1245 1325 1355
1425 1455 1525 1550 1615 1645 1715 1745
1815 1905 1935 2005 2035 2105 2155 2225
2255 2320 2325 2355 0020 0105 0120 0135
0205 0220 0235 0305 0330 0335 0405 0430
0435 0505 0535

departure From Kempegowda Bus Station

0600 0630 0635 0700 0730 0735 0800 0820
0825 0850 0920 925 0950 1020 1050 1115
1200 1230 1300 1330 1400 1425 1450 1520
1550 1620 1650 1740 1810 1840 1910 1940
2030 2100 2130 2200 2230 2340 1210 1240
0110 0140 0230 0300 0330 0400 0430 0440
0500 0540

bias-11
bangalore International Air Port Tochikkalasandra Bus Stand
departure From Bangalore International Air Port

0520 0635 0750 0830 0935 1030 1125 1220
1300 1425 1520 1620 1720 1830 1930 2030
2130 2210 2330 0045

departure From Chikkalasadra Bus Stand

0430 0520 0600 0705 0800 0900 1000 1050
1155 1300 1400 1500 1620 1655 1750 1850
2000 2120 2240 0330

bias-12
bangalore International Air Port Tokuvempu Nagara (Btm Layout)
departure From Bangalore International Air Port

0415 0520 0620 0720 0820 0920 1040 1240
1340 1440 1620 1720 1820 1920 2020 2140
0045 0230

departure From Kuvempu Nagara (Btm Layout)

0415 0520 0610 0720 0830 0940 1030 1140
1240 1450 1610 1710 1820 1930 2025 2130
2245 2400