Yes, there are multiple flights from Singapore to Gambia for under S$ 2,548. The cheapest flight booked recently is on Lufthansa for just S$ 2,420, but on average you can expect to pay S$ 2,420.
There are no direct flights from Singapore to Gambia, but Cheapflights can provide you with all the information you need to find the fastest route with the fewest stops.
For as low as S$ 2,420, Lufthansa can have you in Gambia from Singapore in 26h 30m.
Flying on Lufthansa is currently your cheapest option to Gambia, with prices starting at S$ 2,420.