Only allowing 2 hrs 30 mins to connect between 2 flights at Changi Airport Singapore is cutting it fine?

Only allowing 2 hrs 30 mins to connect between 2 flights at Changi Airport Singapore is cutting it fine? Flying in with Firefly (terminal 2) and flying out with Qantas (terminal 1). Most likely need to collect luggage and clear customs before transferring to the next terminal.

Cutting it quite fine. I strongly recommend you get more padding. You will probably have to go landside anyway, because you should be required to submit for a document check at the QF check-in even if you have OLCI.

2hrs 30 is plenty if your inbound is on time, but with separate itineraries I wouldn't be comfortable without a plan 'B'.

Fairly sure you won't be able to interline your baggage.

Thanks. Would purchasing this ticket marketed by MH (MH code share) boost the chances of interlining my luggage? Since they are part of the Oneworld family.    

Make sure you have travel insurance,cause if your first flight is late you will miss your Qantas flight .

You would make it if you forward your luggage on befor you and only take a carry on bag,this means you would not have any bags to check in.there are a lot off companies that provide the service .

Agree with the above - two airlines, two terminals and possibly no interlining of bags? A bit too much room for something to go wrong. Might also be worth using FlightAware to check the historical on-time performance of the Firefly flight. I'd rather have an extra hour up my sleeve and spend that in the Qantas Singapore Lounge if the planets align and things do run smoothly, then be rushing like a madman between terminals and be super-stressed (and super-sweaty!) due to something going awry.

enojet  are you doing SZB/SIN?

IPH/SIN which is operated twice daily, the alternative flight with earlier arrival would mean that I'll be stuck in Changi for 7hrs. Hoping to spend a bit more time in IPH if possible. 

Damn, IPH is a tough one. Is there any reason you're not using PEN?

PEN was one of the options too, but friends have planned to work their way south. Since I need to return to Aus early, IPH seems to be the best option location-wise. 

Not sure why everybody is thinking 2.5 hours would not suffice. Singapore is the most efficient airport in the world, if you cannot do it there, you can't do it anywhere in the world. . You will have plenty of time to transfer, even to re-check bags , clear immigration and change terminals.

It's about the risk. S/he needs to arrive bang on time, clear immigration, collect baggage, change terminal and then check in again. It's not impossible at SIN, but it's pushing it.

If I was the OP I would endeavour to find some way to fly out of PEN, or take the additional layover in the Terminal 2 food centre.

Is IPH/SIN on firefly significantly cheaper than IPH/KUL/SIN or IPH/PEN/SIN on MH?

At least you have the convenience of interline check-in for your luggage.

MH flies IPH-SIN direct as well. When flying from PEN you can take JQ, MH, SQ and MI direct.

I think transitting in KUL on any airline would be worse than going direct on Firefly. I have a feeling that posters here think that Firefly is not reliable? Being low cost airline does not mean they are always late or cancel flights jst like that, it can happen on any airline and actually looking at on time performance stats you can see they are on par with MH, no difference.