Thanks to wfb for the great idea!! ^
Since this forum is for budget travelling, here's a list of info that I compiled over the years for low cost carriers, as well as "consolidators" that are based in Europe. This list is accurate, as of today (October 21st 2010) and is by no means completed (and probably never will, as it's a moving target!!
). LCC's comes and goes, so I'll need your help to try to keep this list as useful and up to date as possible. Please PM me if there is LCC's that I have forgot to include in the list and I'll include them in the list. Please also PM me if you find that a website is no longer working, or when an LCC goes under. This post is a live document and will change, as the picture of LCC's will change!
I divided the list into continents, and then into country, when appropriate.
GENERAL REFERENCE SITES
http://www.flybudget.com/ (thanks to wfb)
http://www.whichbudget.com/?lang=en (thanks to wfb)
http://www.lowcostroutes.com/ (thanks to ripago)
EUROPE
European LCC's
http://www.easyjet.com/
http://www.ryanair.com/site/EN/
http://www27.germanwings.com/
http://www.airberlin.de/
http://www.tuifly.com/en/index.html
http://www3.flybe.com/
http://www.jet2.com/cgi-bin/airkiosk...i?LS=2&LANG=EN
http://www.flyglobespan.com/
http://www.aegeanair.com/aegeanen/home/index.asp
http://www.gexx.de
https://www.flydba.com/app/fb.fly?l=...2D5029BA8A3090
http://www.virgin-express.com/
http://www.transavia.com/en
http://www.norwegian.no/sw7127.asp
http://www.maersk-air.com/en/
http://www.kullaflyg.se/Booking1.asp
http://www.flynordic.com/?lng=DC4C14...D-FCA6CB5C1C24
http://www.icelandexpress.com/
http://wizzair.com/index.shtml
http://www.helvetic.com/en/Default.aspx
http://www.flybaboo.com/
http://www.intersky.biz/
http://w3.volawindjet.it/default.aspx?lang=gb
http://www.vueling.com/EN/index.php?mode=
http://www.smartwings.net/en/
http://www.arkefly.nl/arkefly/search/searchFlight.do
http://www.atlasjet.com/en/default.asp
http://www.cityjet.com/ (thanks to ripago)
http://www.meridiana.it/ (thanks to ripago)
http://www.izair.com.tr/ (only in Turkish)
http://www.welcomeair.com/CMS_WLC/
http://www.skyexpress.gr/ (Greece and Crete)
http://www.airmalta.com (thanks to malteser)
http://www.clickair.com/view/default.aspx?lang=2 (thanks to LXboy)
http://www.atlas-blue.com/en/index.php (thanks to davidcalgary29)
http://www.airbaltic.com/public/index.html (thanks to davidcalgary29)
http://www.blueairweb.com/ (thanks to ripago)
Consolidators
http://www.openjet.com/public/index.jsp
http://www.air-europa.com/en/default.html
http://www.europebyair.com/eba/English_us/default.jsp
http://www.sterlingticket.com/en/forside_en
http://www.skyscanner.net/ (thanks to ulrich)
http://www.easylow.com/ (thanks to Luca T.)
http://www.wegolo.com/(rqvokkb3ak0rb...45)/step1.aspx (thanks to crox40)
NORTH & SOUTH AMERICA
Canada
http://www.flyporter.com/
http://c1dsp.westjet.com/guest/home.shtml?language=EN
http://www.airtransat.ca/en/0_0.asp (thanks to BJ21)
USA
http://www.southwest.com/
http://www.airtran.com/
http://www.jetblue.com/
http://www.spiritair.com/welcome.asp...campaign=promo
http://www.usa3000.com (thanks to civicmon)
http://www.frontierairlines.com/ (thanks to FRNTBOY)
MEXICO
http://www.avolar.com.mx/ (thanks to JDiver)
http://www.interjet.com.mx/
http://www.clickmx.com/
http://www.volaris.com.mx/
http://www.vivaaerobus.com.mx (thanks to johnmc)
http://www.alma.com.mx (thanks to johnmc)
http://www.aerocalifornia.com.mx (thanks to johnmc)
BRAZIL
http://www.voegol.com.br/INT/index_ie.asp (thanks to civicmon)
http://webjet.com.br
http://www.tam.com.br/b2c/jsp/default.jhtml (thanks to davidcalgary29)
ASIA, AUSTRALIA & INDIA
http://www.airasia.com (thanks to civicmon)
http://www.tigerairways.com (thanks to civicmon)
http://www.jetstarasia.com (thanks to civimon)
http://www.virginblue.com.au/ (thanks to civicmon)
http://www.nokair.com/nokconnext/asp...currlang=en-US
http://www.jetstar.com.au/
http://www.valuair.com.sg/
http://www.hongkongexpress.com
http://www.fly12go.com/en/main.shtml (thanks to davidDTW)
http://www.polynesianblue.com/
http://www.bangkokair.com
http://www.china-sss.com/ (thanks to mellowg)
http://www.jejuair.net/ (only in Korean)
http://www.garuda-indonesia.com/
http://www.cebupacificair.com/ (Philipines)
http://www.flyvivamacau.com/en/ (thanks to GibSpmuh)
INDIA (Thanks to Buck3y3nut for all the India links below!!)
http://www.airdeccan.net/
http://www.flykingfisher.com/
http://www.jetairways.com
http://www.goindigo.in
http://www.goair.in
http://www.spicejet.com
http://www.indian-airlines.nic.in/
http://www.airindia.com
http://www.airsahara.net
http://www.airindiaexpress.in
http://www.paramountairways.com
Matrix of cheap flights in India
:
http://india.makemytrip.com
AFRICA
http://www.kulula.com (thanks to roger)
http://www.flymango.com (thanks to thanks to dracularsa)
http://www.kulula.com (thanks to dracularsa)
http://www.1time.aero (thanks to dracularsa)
MIDDLE EAST
http://www.airarabia.com (thanks to jbfield)
http://www.jazeeraairways.com/
http://www.flyariana.com/ (Afghnanistan)
http://www.flydubai.com/