Most travelers passing through Hanoi's Noi Bai or Saigon's Tan Son Nhat on a connecting flight don't need any visa paperwork at all. The confusion usually comes from mixing up three different situations: airside transit, landside transit, and what happens when your layover stretches past 24 hours.
The Short Answer: Airside Transit Requires Nothing
If you are connecting between two international flights and you never cross into the immigration hall — meaning you stay in the international departure zone — you do not need a Vietnamese transit visa. This applies at both Noi Bai International Airport (Hanoi) and Tan Son Nhat International Airport (Saigon (사이공 / 西贡 / サイゴン)). You clear security, find your gate, and you're done. No stamp, no form, no fee.
This is the situation for the vast majority of layover passengers. Vietnam (베트남 / 越南 / ベトナム) does not have a list of nationalities that must apply for an airside transit visa the way some countries do (the UK's DATV system, for example). As long as you are not entering Vietnamese territory, no visa of any kind is required.
When You Do Need Documentation: Leaving the Airport
If your layover is long enough that you want to step outside — grab a bowl of "pho" in the Old Quarter, drink an "egg coffee" somewhere in Hanoi, or eat "com tam" near District 1 in Saigon — then you are entering Vietnam, and you need a valid visa or visa exemption to do so.
For most passport holders, the easiest route is the standard e-visa, which covers single-entry stays up to 90 days and costs USD 25. You apply at the official Immigration Department portal (xuatnhapcanh.gov.vn) and typically receive approval within three working days. The e-visa is valid at both Noi Bai and Tan Son Nhat, so it covers both main hub airports.
If your country has a bilateral visa-exemption agreement with Vietnam — citizens of Thailand, Singapore, Germany, France, Italy, Spain, the UK, and several others qualify — you can enter without any visa for stays ranging from 14 to 45 days depending on nationality. Check the current exemption list before you travel, as agreements do get updated.
The 24-Hour Landside Transit Rule
Here is where things get slightly more specific. Vietnam does have a provision for what immigration officials call "transit without visa" — a short landside entry permitted for passengers transiting onward to a third country. Under this rule, eligible passengers can enter Vietnam for up to 24 hours without a standard tourist visa, provided:
- You hold a confirmed onward ticket to a third country (not back to your origin).
- You entered Vietnam at an international border checkpoint (airport, seaport, or land crossing).
- You intend to depart within 24 hours.
In practice, this rule is inconsistently applied and not universally understood at immigration counters. Some officers will wave you through on a connecting ticket; others will ask for a visa. The safest approach: if you plan to exit the airport for any reason on a layover under 24 hours, carry your e-visa or check your visa exemption status. Relying on the transit provision without documentation is a gamble.
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Hanoi vs. Saigon: Any Practical Difference?
For transit purposes, the two airports operate under the same national immigration rules. That said, they feel quite different in practice.
Noi Bai (Hanoi) is larger and more spread out. International connections happen in Terminal 2; domestic flights use Terminal 1, which is a separate building connected by a free shuttle bus. If your onward flight is domestic — say, continuing to Da Nang, Hue, or Da Lat — you will need to clear immigration and re-check in. That means you need a visa or exemption regardless of your total time in the country.
Tan Son Nhat (Saigon) has international and domestic terminals in closer proximity, but the same rule applies: any domestic connection requires an immigration stamp, which requires valid entry authorization.
Connecting to Domestic Destinations
This catches people off guard more than anything else. You fly into Hanoi from overseas, then catch a connecting domestic flight to Phu Quoc or Ninh Binh for the next leg of your trip. Even if your total time in Vietnam is just two hours on the ground, you have entered the country. You need a visa or an exemption. There is no workaround here.
Plan accordingly: apply for the e-visa before you leave home. It is cheap, it is fast, and it removes all ambiguity.
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What About Visa on Arrival?
Visa on arrival through a pre-approved letter from an agency still exists but is largely redundant now that the e-visa covers most nationalities and is issued directly by the government. Avoid third-party sites charging inflated fees for e-visa "assistance" — the official portal is straightforward and the USD 25 government fee is the only cost you should pay.
Bottom Line
If you are staying airside on an international-to-international connection at Hanoi or Saigon, you need nothing. If you are exiting the airport for any reason — even for a few hours — get your e-visa sorted before you fly. And if your Vietnam stop connects to a domestic flight, treat it as a full entry regardless of how brief it feels on the itinerary.
Last updated · May 30, 2026 · independently researched, never sponsored.
