Domestic Air, Bus, and Rail Ticket Booking (India)

Travel Portals (Air Tickets, Tours, Weekend Gateways, and Hotels)
Air Tickets India - http://www.airticketsindia.com/
At Your Price - http://www.atyourprice.in/yourprice/
Cleartrip - http://www.cleartrip.com/ (Upto 50% cashback on base fare of Domestic Flights !)
Ezeego1 - http://www.ezeego1.co.in/  (SBI Card: 400 cash back)
Expedia (India) - http://www.expedia.co.in/
Ixigo - http://www.ixigo.com/

Kayak (India) - http://www.kayak.in/
MakemyTrip - http://www.makemytrip.com/
Travelocity (India) - http://www.travelocity.co.in/
TravelGuru - http://www.travelguru.com/flights/flights.html
Via - www.via.com 
Yatra - http://www.yatra.com/ (Upto 50% off on hotel booking)
Zoomtra - http://www.zoomtra.com/

Airlines Website

Air India - http://www.airindia.com/SBCMS/Webpages/Home.aspx
GoAir - http://www.goair.co.in/
Indigo - http://book.goindigo.in/skylights/cgi-bin/skylights.cgi
JetAirways - http://www.jetairways.com/EN/IN/home.aspx



SpiceJet - http://book.spicejet.com/

Rail Tickets India
IRCTC (Indian Railway) - http://www.irctc.co.in/
Trains Between Important Stations- http://www.indianrail.gov.in/inet_metro_trns.htmlCleartrip Trains - http://www.cleartrip.com/trains/
PNR Status Inquiry(Indian Railway) - http://www.indianrail.gov.in/pnr_stat.html
Makemytrip Rail Tours - http://www.makemytrip.co.in/makemytrip/railtours/home.jsp

Bus Tickets India
www.rajnationalexpress.in/
http://www.redbus.in/
http://ksrtc.in/
https://www.kpntravels.in/ou/frmtermsandconditions.aspx
http://www.prasannatours.com/
http://www.ticketvala.com/ticketvala/Welcome.do
http://www.ticketgoose.com/ticketgooselive/TravelSearchCriteriaAction.do?event=searchCriteria&indexreq=1