Hanoi airport to the Old Quarter: the $1.75 decision

You land at Noi Bai, jet-lagged, holding a backpack and no Vietnamese dong, and the trip's first budget decision is already in front of you: how do you cover the 25-ish kilometers into the Old Quarter?

Option one: bus #86, about $1.75

The #86 is the official express bus between Noi Bai and the city center. It costs around 45,000 VND (about $1.75), it's air-conditioned, it has luggage space, and it drops you within walking distance of most Old Quarter guesthouses. It is not a hack or a hardship option; it's a normal bus that normal people take.

Option two: a taxi, $15 to $20

A taxi or ride-hail car from the airport runs $15 to $20. Sometimes that's the right call: you're landing after midnight, you're two people splitting it, or you've been in transit for 30 hours and your soul has left your body. No judgment. But make it a decision, not a default.

The math that makes it interesting

The difference is roughly $18. In Hanoi, $18 is not "$18 back home." It's more than three full days of street food (a complete eating day runs $4.90, priced item by item), or a night and a half in a private guesthouse room. That's the exchange you're actually weighing at the taxi rank.

Data: sort it before the bus, not at the hotel

A Viettel tourist SIM or eSIM with a monthlong data plan runs 60,000 to 200,000 VND ($2.00 to $6.50) locally. Convenience eSIMs bought online before you fly run $10 to $15: you're paying a few dollars extra to skip a counter queue, which is a legitimate trade, just a knowing one. Spread over a month, local data works out to about fifty cents a day.

Getting around once you're in

Short GrabBike hops of 2 to 3 kilometers cost around 25,000 VND (about $1.00), with the first 2 km metered at 12,000 to 15,000 VND. Three hops a day is $3.00 on the standard $30/day receipt. The Old Quarter itself is best on foot anyway, which brings the price of Hanoi's best activity to zero.

Your first evening costs nothing

Hoan Kiem Lake at sunset (come back at 6am, it's even better), St. Joseph's Cathedral, and getting properly lost in the Old Quarter grid are all free. The famous train street is free too if you go early, before the tour groups. Save the ticketed sights (Temple of Literature at 70,000 VND, Hoa Lo Prison at 50,000) for a full day.

Where this goes wrong

• Unmetered taxi quotes at arrivals. Use the official queue or a ride-hail app so the price exists before the car moves.
• Changing a pile of cash at the worst possible counter. Airport rates are airport rates everywhere on earth; change or withdraw enough to get to town, do the rest in the city.
• Booking a hotel on the tourist strip and pricing your whole trip off that block. The strips run 20 to 30% above street prices for everything. One block off fixes it.