Try to find a cheap flight online before reaching a travel agent. On the Internet you will find many providers for cheap flights, but especially for Sri Lanka we recommend to take following providers as we found the cheapest deals on their sites.
Book the flight 2 – 4 months in advance to keep the costs down. We found low-cost flights from europe ranging from €500 to €700. Even if you book a little too late for a flight you can get cheap flights with a longer transfer time (6 – 12 hours) most likely in Doha if you fly with Qatar or in Dubai if you fly with Emirates.
Search for cheap flights on the Internet at all times throughout the day!
Uncomfortable flight times are cheaper!
Check the allowed weight of the specific airline for your backpack on the Internet as overweight can make your journey really expensive!
When searching for flight to Sri Lanka destination code is CMB (Colombo international airport)