Just wondering, buying a SQ ticket on the spot @ the airport, is it the same price as the normal e-ticket or is it more expensive?

I know for most other carriers, it is sometimes more expensive at the airport.

Also wondering, are you able to buy an open ticket? Eg, I be going to KL soon, and since i travel to KL often, can i buy a ReTurn Ticket from KL-SIN-KL but my ReTurn ticket date for SIN-KL is not confirmed yet. (Reason, buying a ticket from KL is cheaper than SIN ).


Thanks