Cost of living in Singapore can vary greatly depending on the way you choose to live. Rental costs for a condo on the east coast of Singapore ( between the city and the airport) around 1500 to 1800 sq ft expect to pay around $4000 pm. For a smaller HDB apartment the cost is much lower.
For the type of flying Tiger crew will do, you would be best advised to stay on the east coast and near proximity to the airport.
Use public transport and taxis and getting around in Singapore is not that expensive, but buy a car and your costs increase dramatically.
This web site may provide some useful info including property rental info
Singapore Expats - Expat relocation, Singapore housing rental, working & staying in Singapore. Singapore property rental, Singapore apartment for rent, Singapore condo for rent, Singapore house for rent
Hope this helps