get quotes from all the Travel Agencies listed here at Sajha. There are many different Travel Agencies that are listed here; so call them ad you'll get an idea to what range they belong to. And, like somebody has suggested above, it also depends on the Airline and travel routes--fewer transit hours, faster routes, probable hasle free routes etc.

Also, visit www.eknazar.com this site contains a bunch of Travel Agencies.

Good Luck.