Singapore is a major transport hub in South-East Asia, and many flights to and from Asia and Australia connect in Singapore's award-winning Changi Airport. Do note that there are no more scheduled passenger flights from Seletar Airport.
It is easy to get to Changi Airport from the city. Depending on how far you travel, taxis from and to Changi Airport cost about S$20 (15 minutes). MRT trains can bring you there for $1.70 (30 minutes).
Flights during peak periods such as Christmas and Lunar New Year (usually in February) can be full and expensive. It is better to avoid these travel periods.
Singapore Airlines (SIA) is the main airline company in Singapore, with a focus on luxurious flight services. Its regional partner, SilkAir, is a close second. Budget carriers in Singapore include AirAsia, JetStar and TigerAirways.
Singapore also has frequent bus connections to all major cities in Malaysia. Unfortunately, there are three different bus terminals, plus a number of unofficial designated spots to catch buses depending on the bus companies. Suffice to say that you should make sure you know exactly which terminal you are departing from!
The Tanjong Pagar Railway Station offers a few limited train connections to Malaysia, but buses are usually cheaper, faster, and more punctual. However, the train is more comfortable if you get a sleeper berth. A number of ferry connections are available to Bintan, Batam and other islands in Indonesia.
Tourists leaving Singapore are eligible to a Goods and Service Tax (GST) refund for items bought in Singapore.