From Changi Airport by:
Train SMRT (CG & East West Green):$2-$5 - http://www.smrt.com.sg/ Trains run every 10 minutes from 5:30 AM - 11:20PM.
Airport Shuttle (WTS Travel):$7-https://www.wtstravel.com.sg/index.php/singapore-airport-transfer Runs every 15 minutes daily.
Bus (SBS Transit line 36):$1-$4 - https://www.sbstransit.com.sg/ Runs every minutes daily.
Taxi: $17-$21 - https://www.smrt.com.sg/Journey-with-Us/Taxis/ Book-a-TaxiAvailable 24/7.
From Seletar Airport by:
Bus: (SBS Transit line 103) $1-$5 - https://www.sbstransit.com.sg/ Runs every 5 minutes daily.
Taxi: $12 - $15 -http://www.publiccab.com/ Available 24/7.
But Private taxes are cheaper than Airport taxis, here to Book at