Hanoi Noi Bai Airport (HAN)

T1, T2 and the gap between them

Noi Bai divides cleanly: T1 takes domestic flights, T2 takes every international arrival and departure, and the two stand as separate buildings with open ground between them. There is no covered walkway and no airside link, so changing terminals means going outside. A free electric shuttle runs the loop through the day and much of the evening, and taxis cover the same short hop, which is what you want when the shuttle has stopped for the night.

That layout is why a domestic connection onto a long-haul departure needs more slack than the timetable implies: bag drop, the wait for the shuttle and a fresh security queue in the second building all sit between the two flights. Travelling light is a genuine advantage here, and so is knowing which building your onward flight uses before you land, because the signage assumes you already do.

Into Hanoi: no rails, one long road

Nothing runs on rails out of Noi Bai. The city's metro lines do not reach the airport, there is no airport express train, and the journey in is a road trip that crosses the Red River on a long cable-stayed bridge before threading into the northern districts. An express airport bus runs to the railway-station end of the centre and is by far the cheapest way in for anyone with a small bag; hotel cars, prebooked transfers and ride-hailing apps cover everything else.

Taxis are where this airport has earned its reputation. The rank outside arrivals is worked by established metered companies, and the sound order of preference is the app, the hotel car, then the rank. Drivers who approach you inside the hall, quote an unusually good price, or announce that your hotel is full, closed or being renovated are running a well-worn script that ends at whichever hotel pays them a commission.

Through the hall and out the door

The arrivals sequence is short: immigration, the belts, a green customs channel, then a door that opens onto a wall of name boards and waiting families. Have the documents in hand before you join the queue — an e-visa printout beside the passport, or the letter of pre-approval that a visa on arrival requires, which is presented at a counter before immigration rather than after it. What each nationality actually needs is a matter of Vietnam's entry rules, and none of it can be sorted out at the desk.

Where Noi Bai can take you directly

Noi Bai is the entry point for the whole north, and a surprising amount of the region's travel starts at the terminal rather than in the city. Operators running to the bay, the rice terraces and the mountain towns sell seats that collect at the airport, which turns a long-haul arrival straight into the first leg of a trip — worth knowing when the capital is not the reason you came. Riders heading for the Ha Giang loop still route through the city for the bus north.

Domestic flights fan out from T1 to the centre and the south of the country, and an arrival from abroad that continues on one of them counts as an entry into the country, not a transfer through it: passport control, bags off the belt, through customs and checked in again next door. It is the single strongest reason to leave more time at Noi Bai than a booking engine suggests.

Layovers, late landings and where to wait

Long-haul flights reach Noi Bai at hours when the city is asleep, and a late arrival is the case for booking a car in advance: the airport bus does not run all night and the inter-terminal shuttle stops as well, which leaves the rank and the app. Fixing the ride before you fly removes the one negotiation nobody wants at the end of a long flight.

Whether to leave the airport on a layover turns on the road, not the clock. Two runs along that road swallow most of a short break, so a stopover in the city earns its place only when you have the better part of a day; anything less is better spent landside with the bags stored, where the seating, the food and the paid lounges are.

Practical: connectivity, cash and northern seasons

A working data plan matters more here than at most airports, because the onward step is a negotiation: buy an eSIM before you fly and the car can be ordered from the baggage belt rather than hunted down at a counter afterwards. Cash machines sit landside in both buildings; take the local currency and turn down the machine's offer to bill you in your own. Small notes are worth having for the bus and for the first stop in town.

The north has weather in a way the south does not, and it shows on the departures board: a cool, grey season that brings low cloud and drizzle to morning departures, and a storm season that rearranges schedules for a day at a time. Build slack into onward domestic connections in both, and take the overland alternative seriously — the night train and the sleeper coach keep running when flights do not.