Jetstar has an offer on at the moment to Pay to go and return for free on flights out of Singapore. You still have to pay for taxes/fees but for longer flights this could be a good saving. The offer is available from now until the 14th of February, with the travel dates mixed, but many up until the end of July 2014. This is the same as the promotion in November last year if it looks familiar!
Update 16/07/14 – New Promotion here.
When you go through and book your flights using the offer page the return flight should come out as $S0, but you’ll still pay the fees and taxes and on my dummy booking to Melbourne they were $S90, but the saving compared to a straight booking was around $S400. There are plenty of short and long haul destinations.
The offer isn’t as good for shorthaul flights, like Singapore to Kuala Lumpur as the fees and taxes make up a greater proportion of the fare, but for medium to long haul they could offer a saving. Note all the other usual extra charges are not changed by the offer – the discount applies to the airfare only.
Here is the link again: http://www.jetstar.com/sg/en/special-offers/return-for-free