据我所知道：
你买的机票是最不利的情况，因为是廉价航空跟正常航空公司的转机。
正常情况下来讲如果是两程都是正常航空公司的机票，你只需要呆在中转区，不需要入境提行李再出境，不需要签证。因为你的行李可以自动（同一航空公司）或者被要求tag（不同航空公司）到最终目的地，并且中转区不需要过境签。
如果你的两程都是同一航空廉价航空公司的机票（虎航和酷航合作，可以互相中转），你需要提前在网上购买他们公司的免签中转服务或者在到达机场购买就能免签中转。如果你懂英文的话，可以看一下他们公司关于免签中转的详细说明。
Tigerconnect comes with an airport transfer feature that makes your transit in Singapore Changi Airport a hassle-free experience. The feature offers greater ease for your onward journey without the need to clear arrival immigration and retrieve luggage. A travel visa for Singapore is not needed.
For flight connections under 8 hours, airport transfer has been incorporated in the flight purchase for hassle-free transfer.
For flight connections more than 8 hours, passengers can purchase the airport transfer feature online for SGD 22 or at Singapore Changi Airport Transfer E for SGD 40. With the airport transfer feature, Tigerconnect passengers can, upon arrival at Singapore Changi Airport, simply collect boarding passes for their onward flights at the transfer counters located at the transit area, Transfer E.
Luggage checked-in will then be sent to the onward flight while they enjoy a wonderful shopping and dining experience at Singapore Changi Airport transit area. Tigerconnect passengers can also opt to explore Singapore via the free city shuttle.
Tigerconnect service for passenger transit in Singapore Changi Airport is only available for Tigerair Singapore flights and its partner airline, Scoot.
大概就是说（1）免签中转网上提前购买22新币，在到达机场购买40新币。中转时间不超过八小时，免签中转已经包含在机票价格内，无需额外购买。中转超过8小时，需额外购买。（2）中转服务仅限于虎航/酷航转虎航/酷航。（3）拥有此服务后，不需要入境提手提行李再入境，也就是不需要签证。直接像正常航空公司一样中转。
你现在的情况是廉价航空转正常航空。廉价航空减少成本的运作方式之一就是在机场比较偏远的地方接机，租费比较便宜。所以一般不会直接连到中转区。这也是为什么廉价航空要自己入境提行李（即使没有行李）再出境进入中转区的原因。因为你的既不符合正常航空的转机，也没法使用廉价航空自己的免签过境，所以对于持有中国护照的你来说，需要有效签证才能转机。
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