Vietnam runs a proper e-visa system now, open to most nationalities, and that's exactly where a lot of travelers assume the onward-ticket question disappears. It doesn't. A dummy ticket, also called an onward ticket, a real PNR booked for visa or border-check purposes without paying for the flight, is still part of the picture for a bunch of entry routes into Vietnam, and it's worth knowing which ones before you're standing at the counter with a one-way flight and no plan.

Does Vietnam actually ask for an onward ticket?

Officially, yes, it can. Vietnamese immigration rules list proof of onward or return travel among the entry conditions, and airlines checking passengers in for a flight to Vietnam are told the same thing by their government-liaison desks. Whether you actually get asked is a different story, it depends a lot on the route, the airline, and honestly a bit of luck. But "usually doesn't get asked" and "isn't a real requirement" aren't the same thing, and only one of those keeps you off a plane back the way you came.

I've got an e-visa, doesn't that cover it?

Not quite. An e-visa gets you past the "do I need a visa" question, but it doesn't automatically answer "when are you leaving." Those are two separate checks that happen to overlap at the same counter. Some travelers get through with an e-visa and a one-way ticket with zero issue. Others get pulled aside specifically because the ticket is one-way and the officer wants a departure date to match against the visa's validity window. There's no way to predict which day you'll get the second question, so it's worth just having the answer ready.

What if I'm genuinely backpacking with no fixed plan?

This is the honest tension for anyone doing Southeast Asia loosely. You don't know if you're leaving via Cambodia, flying to Bangkok, or staying an extra month. A dummy ticket solves this better than committing to a real flight you might not take: book a real, checkable reservation dated somewhere inside your visa window, and if your plans change, you deal with that later. It's not a lie, it's a placeholder that happens to be true right up until you decide otherwise.

Does the airline check before immigration even gets involved?

Usually, yes, and this is the part backpackers forget about. Airlines flying into Vietnam carry liability if they land someone who then gets refused entry, so check-in staff have their own incentive to ask before you even board, not after you land. If you're going to get asked at all, there's a decent chance it happens at your departure airport, not in Vietnam.

What happens if I get flagged at the counter?

Best case, you show a valid onward booking and it's a non-event, ten seconds and you move on. Worst case, without one, you're looking at a longer conversation, possibly a request to book something on the spot at whatever price is available at that exact moment, which is never the price you'd have gotten a week earlier. Neither outcome is likely if your paperwork is in order. That's the whole point of sorting it out in advance instead of at the desk.

Does it change if I'm crossing overland instead of flying in?

A bit. Land border crossings from Cambodia or Laos into Vietnam get checked less consistently for onward proof than an airport arrival does, mostly because there's no airline in the middle carrying liability for the decision. That's not a guarantee you'll never be asked, immigration officers at land crossings can still ask, it's just less routine than the check-in-desk version of this. If you're flying out of Vietnam later regardless of how you got in, the airline will still want to see something at that point.

Is there a cheaper way to handle this than booking a real return flight?

Yes, and it's the entire reason dummy tickets exist as a category. If you know you're flying home or onward eventually but don't want to lock in a full-price ticket months in advance, a dummy ticket gets you a real, checkable reservation without the upfront cost of a ticket you might change anyway. It's not a loophole, it's just matching what you pay for to what you actually know about your trip right now.

What should I actually book?

Something with a real PNR that resolves if anyone looks it up, dated inside your e-visa's validity window, not just vaguely "sometime before it expires." A round-trip you'll actually use is fine if you know your dates. A separate onward ticket is fine if you don't. What doesn't work is a screenshot of a flight that was never actually reserved, because that falls apart the moment anyone checks.

Entry route Onward proof typically expected? Where it usually gets checked
E-visa Yes Check-in and occasionally immigration
Visa exemption (where applicable) Yes Check-in mostly
Visa on arrival with pre-approval letter Yes Check-in and arrival

Not sure where to start? Our what is a dummy ticket explainer covers the basics, and if you want the officer's-side view, how border officers actually check an onward ticket walks through what they're looking for. When you're ready, book a real, verifiable onward ticket and stop thinking about it.

Sources: gov.uk Foreign travel advice: Vietnam, IATA Timatic.