A dummy ticket, also called an onward ticket, is a real PNR booked for visa or border-check purposes without paying for the flight. Singapore doesn't require a visa for a long list of nationalities, and that's exactly why people show up at check-in with no onward plan at all. Changi's immigration is fast. Your airline's check-in desk is where this actually gets decided.

If you're two hours out and just realized you have no return flight

Book something now, not the cheapest option, the fastest one to confirm. A real onward or return flight, even a short domestic hop within Southeast Asia dated a few days out, resolves this in the time it takes to check out. Skip anything that promises a ticket "within 24 hours." You don't have 24 hours. You need a live PNR before you're at the counter.

If you're at check-in and they're asking for it right now

Pull up the booking on your phone, not a screenshot saved from earlier. Airlines flying into Singapore, including Singapore Airlines on long-haul routes, check this because they're liable for flying in someone who then gets refused entry, and immigration in Singapore does turn away travelers who can't show they're not staying indefinitely. Singapore Airlines' own travel document requirements spell out what check-in staff are working from, and it's worth reading before you're the one holding up the queue. Staff want something they can look up, fast. A live confirmation number does that. A photo of a confirmation email from a provider that's gone offline doesn't.

If they say the ticket "didn't verify"

This means the record locator didn't resolve on the airline's own lookup, which happens when a provider generated a mockup instead of an actual GDS booking, or when the PNR already lapsed. Ask for the confirmation number again and try the airline's own manage-booking page yourself, on the spot, before assuming it's a misunderstanding. If it genuinely doesn't come up, you need a different ticket, not a different explanation. Providers who issue through a real GDS can usually reissue or re-confirm within minutes, since the underlying reservation still exists somewhere in the system. Providers who can't do that in front of you probably never had a real booking to begin with.

If you're not sure whether you even need one

Plenty of nationalities get visa-free entry to Singapore, and it's easy to assume that means no document checks at all. It doesn't. Visa-free entry and proof-of-onward-travel are two separate questions, and airlines apply the second one regardless of your visa status. The UK government's Singapore travel advice covers entry conditions in more detail if you want the fuller picture before you book anything.

If you have a day or two before you fly

Match the ticket to a route you'd plausibly take. A flight out of Singapore to a country nearby, at a fare that reflects a real fare class rather than the absolute floor price, reads as ordinary rather than manufactured. This is also the point to check validity: a PNR that lapses before your actual return date does nothing for you once you've already landed and need to show it again on the way out, or to a hotel that asks.

If you're doing a Southeast Asia loop and Singapore is just one stop

The Bali-Singapore visa run pattern is well known, and Singapore-specific entry is a slightly different question from that loop. Even if your longer-term plan is bouncing between countries on tourist entries, the ticket that gets you through Changi check-in needs a defined, checkable next step, not just "somewhere in the region eventually." Immigration and airline staff are looking at this single flight's paperwork, not your whole itinerary.

If you already paid and it still didn't work

Ask the provider directly whether they issue through a GDS or generate a static document. That single question sorts out most disputes fast. A refund argument over a PDF that was never a real booking goes nowhere. A live PNR that failed to resolve because of a provider-side error is a fixable problem, usually with a re-issue.

Time left What to do What to skip
Under 2 hours Book the fastest confirmable route, any plausible destination 24-hour delivery promises
At the counter Pull up the live booking on your phone A saved screenshot
A day or two Match route and validity window to your actual plan The cheapest possible fare with no route logic

None of this is unique to Singapore. It's the same check that happens at most transit hubs, just faster here because Changi's own processing moves quickly and the airline desk is where the actual holdup happens.

For how each checkpoint differs, see dummy ticket vs real ticket: what each checkpoint checks, and for the basics, what a dummy ticket actually is.

Book a verifiable onward ticket that resolves on the airline's own system before you're standing at Changi finding out the hard way.