You can find cheap flights from 500eu to Sri Lanka with Quatar or Emirates, but
there are many other options also. We chose Quatar Airways because of their baggage allowance. We didn’t
need to pay extra for sport luggage and each bag can be up to 30 kg. The trip
was around 12-14 hours including one stop at Doha.
From Colombo Airport we had a bus organised by our host, Surfpoint Sri Lanka, with foldable seats so we could continue sleeping as the trip was 3-4h to Kapitiya. Probably this is the best and cheapest option for airport shuttle. Some of the guys, who arrived later got a ride with online apps but it costed the same and it was less comfortable for them.