At the moment, there are zero airlines flying to Cairns. Go through the results to find the right flights for you – you can adjust the filters to see find even more flights to Cairns.
If you want to broaden your search, look at flights departing from other airports.
The distance between London Gatwick to Cairns is 15174 km. You can see the various flight times in the results.
Searching by month, for instance, will show you the best time of the week to fly.