On average, Apia (APW) is the cheapest airport for flying into Samoa, so consider starting your trip from there. 27 flights land in the country from the UK every week so, if you can’t find what you’re looking for, try searching by month to see a broader range of flights. Searching by month will also show you the cheapest day to fly.
You might like to know that, out of all four airlines that fly to Samoa, Singapore Airlines usually has the lowest prices. What are you waiting for?