Yes, there are multiple flights from Zanzibar International to Changi Intl for under S$ 1,462. The cheapest flight booked recently is on Multiple Airlines for just S$ 1,337, but on average you can expect to pay S$ 1,943.
There are no direct flights from Zanzibar International to Changi Intl, but Cheapflights can provide you with all the information you need to find the fastest route with the fewest stops.
The rainfall in Zanzibar is generally less than the rainfall in Singapore City Airport. This will continue over the next 12 days.
You can imagine temperatures to be in the 33 °C range in April. The weather in Singapore City Airport is generally hotter than Zanzibar's. As flight availability is subject to become more limited as peak season approaches it is ideal to book in a timely manner.
For as low as S$ 1,718, Qatar Airways can have you in Changi Intl from Zanzibar International in 22h 15m. Both multi-stop and direct flights can be found to your destination and back.
Cheapflights users have booked flights from Zanzibar International to Changi Intl from S$ 1,412 return. Other airlines that can offer you cheap pricing are Qatar Airways, from S$ 1,718, and Emirates, from S$ 1,823.