Book a real onward flight now, even a cheap short-hop one, if you're heading to Uruguay with no return or continuing ticket. Do that first. Read the rest while it's confirming. A dummy ticket, also called an onward ticket, is a real PNR booked for visa or border-check purposes without paying for the flight, and Uruguay's checks move fast enough that you want the document sorted before you're the one being asked about it.

If you still have a full day before you fly

Book properly, not in a panic. A one-way ticket into Uruguay with nothing booked out is the exact profile that gets a second look, so decide now whether a return flight home or a separate onward ticket to your next country makes more financial sense, then book whichever one you'll actually need anyway. A ticket booked a day ahead, with time to check the dates and the name against your passport, is worth more than the same document rushed together at the gate.

If you're at the check-in counter right now

Don't argue the visa-exemption point. Uruguay lets many nationalities in without a visa for tourism, and that fact has nothing to do with whether the airline wants to see proof you're leaving. Pull up a booking app, buy the cheapest genuinely ticketed flight out of Montevideo within your planned stay, and show the confirmation screen. A held, unpaid reservation won't help here. It needs to actually be ticketed.

If you have 45 to 60 minutes before boarding

You have time to be a bit more careful. Check three things on whatever you book: the departure date sits inside the stay you're planning to declare, the name matches your passport exactly, and the PNR resolves when you search it on the airline's own site, not just in your inbox. The U.S. State Department's country information for Uruguay notes that travellers may be asked to show evidence of return or onward travel, so treat the request as normal rather than unusual.

If you already checked in and they've flagged it

This usually means the agent searched your onward booking and it came back empty, expired, or unticketed. Fix it the same way as at the counter: book something real, right there, and bring the confirmation back to the desk. Airlines verify this kind of document through IATA's Timatic system, so a booking that looks fine on paper but doesn't resolve in that check will get caught either way.

If they've already refused boarding

Ask, calmly, exactly what document would resolve it: a specific onward flight, or general proof you won't overstay. Officers and gate staff aren't being difficult for its own sake. They need something concrete to point to before they can say yes. Book that specific thing if you can do it from where you're standing, and ask whether you can still make a later flight the same day once it's sorted. A refusal at check-in is rarely the end of the trip. It's usually one missing document away from a fix, and the fastest way through it is giving the agent exactly what they asked for instead of arguing the broader point.

What Uruguay actually checks, once you're sorted

Once the onward ticket exists and resolves, the rest of entry is routine: passport validity, a plausible stated purpose, and for most visa-exempt tourist stays, not much else. The onward ticket isn't a special Uruguay-specific hurdle. It's the same document most Southern Cone countries expect, just enforced with varying consistency depending on the officer and the day.

Time left versus what to actually do

Time you have What to do
A full day or more before your flight Compare return vs onward, book properly, check dates and name calmly
At the counter, no ticket Buy a real, ticketed flight out immediately, show the confirmation
45 to 60 minutes before boarding Book carefully: dates, name match, and a PNR that resolves
Already flagged after check-in Rebook on the spot, bring the new confirmation back to the desk
Already refused boarding Ask what specific document resolves it, then book exactly that

None of this is unique to Uruguay. Argentina runs the same basic check next door, and the underlying logic is consistent everywhere a border relies on a ticket rather than a stamped visa to confirm you're not staying for good. If you want the fuller picture of what counts before you're standing at a counter, this breakdown of what proof of onward travel actually means covers it without the clock running.

Sort a properly ticketed onward ticket with Get Dummy Ticket before the counter, not during it.