The short answer.

Hanoi (4 nights) → Bai Tu Long Bay overnight (1 night) → sleeper train south to Hue (1 night) → Hue (2 nights) → Hoi An (4 nights) → flight to Saigon (3 nights, including a Mekong day or overnight). The arc is north-to-south, and it is correct. Hanoi is the harder city to read; you give it your best attention first. Hue is the imperial pause. Hoi An is the slowdown. Saigon is the loud, honest ending — the city you can leave from without regret. Reverse the order only if your flights demand it; the experience favors the canonical direction.

Hanoi. Four nights, not three.

Hanoi takes more than two days to read. The Old Quarter is dense, narrow, smoke-and-noise; the French Quarter is wide, slower, with cafes that survived the war and the colonial reorganization both. The lakes — Hoan Kiem in the center, West Lake to the north — are where the city walks at six in the morning, and a slow lap of one of them is the right opening to any day here. The food in Hanoi is not Saigon's food. Bun cha at lunch, a small charcoal-grilled pork meal in a noodle broth. Pho for breakfast, not dinner. Egg coffee at a particular café that has been making it since the 1940s.

Four nights gives you three full days. One for the Old Quarter and the lakes. One for a slower walk through the French Quarter, the Temple of Literature, and an early dinner. One for Bai Tu Long Bay, the quieter neighbor of Ha Long, on an overnight cruise — but only if the season is right. May through August the bay smogs over and the photographs you came for do not exist. October through March the cruise is the trip's best single day.

The sleeper train. Soft sleeper, lower berth, quietly.

The sleeper train south is part of the trip, not a way to get past it. Book a soft sleeper — four-berth cabin, two upper, two lower. Lower berths if there are two of you. The hard sleeper is six berths, slightly cheaper, and you do not actually sleep. The two-berth VIP cabin exists but the price-to-experience ratio is poor. Soft sleeper is the answer.

Departure from Hanoi station at around 7pm. The cabin is small, the sheets are clean, the windows open. You pass through northern Vietnam in the dark, wake somewhere in the middle of the country at first light, and arrive in Hue around 8am. The dining car is functional, not romantic; bring snacks, a bottle of water, a book. The train is not a luxury experience. It is a transit experience that is itself worth having, which is a different thing.

Hue. Tombs along the Perfume River.

Hue is a one-and-a-half-day stop. The Imperial Citadel — the old Nguyen capital — takes a morning. The royal tombs along the Perfume River take an afternoon; hire a small boat or a car and visit Tu Duc, Khai Dinh, and Minh Mang in sequence. The food in Hue is regional and sharp: bun bo Hue, a beef noodle soup with lemongrass and chili that is meaningfully different from any other Vietnamese soup; nem lui, grilled pork on lemongrass skewers wrapped at the table.

Two nights is the floor. A third night is correct only if the rain has set in and you want to read for a day. Otherwise, continue south.

Hai Van Pass. Three hours of cinema.

The Hai Van Pass between Hue and Da Nang is the most cinematic coastal drive in mainland Southeast Asia. Three hours by car. Take a private car with a driver if budget allows; the train also makes the trip but the views are oblique. The pass climbs through cloud, drops onto the South China Sea, and delivers you onto the long beach approach to Da Nang. Skip Da Nang itself — it is a working coastal city without the texture of its neighbors. Continue thirty minutes south to Hoi An.

Hoi An. Four nights, and slow them down.

Hoi An is small. Four nights is correct. The lantern district at dusk is the photograph; the morning market on the river is the meal; the day in between is yours. The instinct on the second day is to add activity — a tailor appointment, a cooking class, a motorbike to the beach, a temple visit, a basket-boat ride. Do one of these per day, no more. The town rewards the traveler who walks the same three streets four times across four evenings until the streets begin to feel familiar.

The day trip to My Son ruins is worth a half-day. Less than Angkor Wat in scale, quieter than Borobudur in atmosphere. Go early — by eight in the morning — to avoid both the heat and the bus groups.

The flight south. Da Nang to Saigon.

From Da Nang or Hoi An, the train south to Saigon is 17 hours. By this point in the trip, the sleeper train has had its romance, and the seventeen-hour ride is no longer a journey but an obligation. A one-hour flight is the right answer for most travelers. The cost is roughly the same. The honesty of admitting that the trip's transit budget has been spent is part of being a good traveler.

Saigon. Three nights, the loud ending.

Saigon — Ho Chi Minh City to its government, Saigon to itself — is the loud, fast counterpoint to Hanoi. Three nights. One day for the War Remnants Museum and the Independence Palace; one day for the food, the markets, and a long walk through District 1; one day for a Mekong Delta day trip or, better, an overnight in Ben Tre or Can Tho. The Mekong is not the trip's main event but it is the right closing image — the river, the floating market at dawn, a long boat through coconut canals.

End the trip with a buffer day in Saigon before the international flight. The flights leave late at night. The buffer is not waste.

Six questions before you book.

North to south or south to north?

North to south. Hanoi is harder; enter it first with full attention. South to north only if flights make it cheaper.

What class on the sleeper train?

Soft sleeper, four-berth cabin. Hard sleeper is too crowded for sleep; VIP two-berth is overpriced. Lower berths if two are traveling together.

Should I skip Ha Long Bay?

In smoggy season (May–August), yes. Cooler months (October–March) the overnight cruise is the trip's best single day. Bai Tu Long is the quieter, better neighbor in any season.

How many days in Hoi An?

Three minimum, four ideal. The town is small. The third day is when you stop trying to see it and start sitting in it.

Is the Reunification Express still running?

Yes. End-to-end is around 32 hours; most travelers ride segments. The mixed itinerary of sleeper + bus + one short flight is the more honest trip.

Visa and entry?

Vietnam e-visa for most nationalities; apply a week before arrival. Multiple-entry if you plan a Cambodia day trip.

The day-by-day. A 14-day shape.

Day 1. Land Hanoi. Hotel in the Old Quarter or French Quarter. Walk Hoan Kiem at dusk. A bowl of pho for an early dinner. Sleep at nine.

Day 2. Hanoi proper. Old Quarter walk in the morning. A street-food lunch. Temple of Literature in the afternoon. An egg coffee at Cafe Giang. A bun cha dinner.

Day 3. Drive to Bai Tu Long Bay (Ha Long's quieter neighbor). Overnight cruise on a small junk-style boat. Kayak into a lagoon. Dinner on deck. Sleep on the water.

Day 4. Morning swim, return to Hanoi. Afternoon for whatever Hanoi-shape you missed — the Vietnam Museum of Ethnology if you want something serious; West Lake if you want a long walk. Soft sleeper train south at 7pm.

Day 5. Arrive Hue around 8am. Hotel near the Perfume River. Imperial Citadel in the afternoon when the morning crowds have gone. A bun bo Hue dinner.

Day 6. Royal tombs day. Tu Duc, Khai Dinh, Minh Mang in sequence by hired car. A nem lui dinner.

Day 7. Hai Van Pass to Da Nang and on to Hoi An. Three hours. Arrive in time for the lantern-lit evening.

Day 8. Hoi An old town walking. The covered bridge, the Chinese assembly halls, the textile shops if you have any interest. A cao lau lunch.

Day 9. My Son ruins. Half-day. Back to Hoi An by lunch. Slow afternoon, swim at An Bang beach if the sea is calm.

Day 10. Cooking class in the morning, slow afternoon. The third day in Hoi An is when you stop trying to see the town.

Day 11. Hoi An morning. Fly Da Nang to Saigon at midday. Saigon hotel in District 1 by late afternoon. A pho dinner near Ben Thanh.

Day 12. Saigon. War Remnants Museum in the morning. Independence Palace. A long walk through District 1. A banh mi from Banh Mi Huynh Hoa for lunch.

Day 13. Mekong Delta day or overnight. If a day trip: Ben Tre with a small boat through coconut canals. If overnight: Can Tho with the floating market at dawn.

Day 14. Saigon morning. Last meal — a banh xeo, a com tam, whatever the trip has been pointing toward. Late-night flight home from Tan Son Nhat.

The food, by city. A short atlas.

Vietnam's food is regional. The pho of Hanoi is not the pho of Saigon. The bun of Hue is not the bun of Hoi An. The traveler who orders the same dish in three cities will conclude that Vietnamese food is monotonous. The traveler who orders the regional specialty in each city will conclude that Vietnam is one of the great food countries on earth.

Hanoi: Pho bo (beef pho, the original), bun cha (charcoal-grilled pork in noodle broth, lunch only), cha ca (turmeric-fried fish with dill, dinner), banh cuon (steamed rice rolls, breakfast). Egg coffee at Cafe Giang. Beer at a bia hoi corner stool, two dollars a liter, sundown only.

Hue: Bun bo Hue (lemongrass-chili beef noodle), nem lui (lemongrass-skewered pork wrapped at the table), banh khoai (a small turmeric crepe), banh beo (steamed rice cakes with dried shrimp). Hue cuisine is sharper and more royal in lineage than the rest of Vietnam.

Hoi An: Cao lau (a thick noodle dish only made in Hoi An because the noodles use water from a particular well), white rose dumplings (banh bao banh vac), mi quang (turmeric noodles with shrimp and pork), com ga (Hoi An chicken rice). Sweet corn milk from the night market is the closing dessert.

Saigon: Pho ga (chicken pho, the southern version is sweeter), banh mi (the canonical sandwich is southern), bun thit nuong (cold rice noodles with grilled pork), com tam (broken rice with grilled pork), banh xeo (a large turmeric crepe). The southern table is sweeter, herbier, more rice-paper-and-leaf-wrapped.

Hotels by city. A short shortlist.

Hanoi. Sofitel Legend Metropole for the colonial-era anchor (Hemingway and Graham Greene both stayed); the historic wing is the only correct choice within the property. Capella Hanoi for a more contemporary, design-driven option in the Opera House district. The Chi Boutique Hotel in the Old Quarter for a mid-tier independent with character. La Siesta Premium Hang Be for a well-priced four-star in the Old Quarter.

Hue. La Residence Hue Hotel & Spa, the former French Governor's residence on the Perfume River — the right anchor in Hue, with proper covered grounds for monsoon-edge season. Pilgrimage Village Resort if you want a quieter setting outside the city center. Eldora Hotel for a cleaner mid-tier option closer to the center.

Hoi An. Anantara Hoi An Resort on the riverside, walking distance to the lantern district. Four Seasons Resort The Nam Hai for the beach-side option, 20 minutes from town (consider only if you want a mixed beach-and-old-town stay). Hotel Royal Hoi An for a smaller, more intimate four-star within walking distance. La Siesta Hoi An Resort for value-driven boutique.

Saigon. The Reverie Saigon for the over-the-top opulent answer (you may find it amusing or distressing). Park Hyatt Saigon at Lam Son Square for the calmer, more European-feeling choice. The Myst Dong Khoi for design-forward boutique at a lower price point. Hotel des Arts Saigon MGallery for old-Saigon nostalgia in the central district.

What I would skip.

Sapa, unless you have an extra five days. The trip north from Hanoi is real — a sleeper train and a long drive. The terraces are beautiful but it is its own trip, not a side excursion.

Da Nang as a destination. It is a transit city. The beach is fine but Hoi An is twenty minutes south and is the better stop.

Phu Quoc unless you are tacking on a true beach week. The flight from the mainland is real and the island is a separate trip in tone.

The full end-to-end Reunification Express. Romantic in concept, an obligation in practice. Use it for one segment. Fly the second.

The northern motorbike loop (Ha Giang, Cao Bang, Ban Gioc). It is genuinely one of the great rides in Asia, but it is a separate trip; do not try to cram it into the overland trip.

Sleeper-train operations. A short manual.

The sleeper train is the trip's structural hinge and the part most travelers handle poorly on first attempt. A short field manual.

Booking. Use Baolau, 12go, or Vietnam Railways' direct site. Book two to three weeks ahead in shoulder season; further out at Tet and during the European summer. Prices for soft sleeper Hanoi-Hue run roughly 800,000 to 1,200,000 VND ($32 to $48). The Livitrans and Lotus are the higher-tier private cars attached to the regular train; comfortable, slightly more expensive, often worth the small premium.

Cabin selection. Soft sleeper, four berths, two upper and two lower. Lower berths if there are two of you traveling together — they are more comfortable and become a couch during the evening hours when sleep is not yet possible. If you are alone, take any berth; you will share with three strangers and almost always those strangers will be Vietnamese families behaving exactly as you would hope.

What to bring. A bottle of water, snacks (instant noodles work; the train has hot water), a small towel, earplugs, an eye mask, a paperback, a phone charger, and one warm layer. The cabin air-conditioning is enthusiastic. A small bottle of hand sanitizer. Slippers if you have them; the cabin floor is fine but you will appreciate not putting your shoes back on every time you go to the bathroom.

Etiquette. Speak quietly after 9pm. Do not eat strongly aromatic food in the cabin. The Vietnamese family sharing your cabin will offer you food; accept a piece, smile, and offer something back. The shared offering is the cabin's currency.

Bathroom. The toilet at the end of the carriage is squat, basic, but clean enough at the start of the journey. Use it early. By morning the conditions will be more challenging.

Arrival. The train arrives at Hue around 8am. The station is a 10-minute walk from most riverside hotels. Walk if your luggage is light; taxi if not. Do not accept the touts at the station gate; use Grab or have your hotel send a car.

Money, SIM, transit. A short logistics block.

Currency is Vietnamese dong (VND). The notes are denominationally heavy — 500,000 VND is roughly $20 — and travelers regularly miscount zeros in the first 48 hours. Withdraw from ATMs at major banks (Vietcombank, Techcombank); avoid the Euronet ATMs at airports, which charge significant fees. Carry small bills for street food and taxis.

SIM card: pick up a Viettel or Mobifone tourist SIM at the airport on arrival. 30 days, 4G data, around $10. Vietnam has excellent rural cell coverage; the SIM works on the sleeper train, on the Hai Van Pass, on the boat in Bai Tu Long.

Grab is the local Uber and works reliably in all the major cities. Use it instead of street taxis, which sometimes meter creatively. For the rural transit (Hue to Hoi An, day trips out of Hoi An), private car with driver booked through your hotel is the right answer; budget around $70 for a half-day with driver in central Vietnam.

Tipping is not expected but increasingly accepted in tourist-facing operations. 10% at restaurants if service was good, $5-10 a day for a private driver, $5 for the houseboat staff at the end of the cruise. Round up taxi fares.

A note on traveling slowly.

Vietnam will reward the traveler who allows it to set the tempo and punish the one who tries to set the tempo themselves. The country runs on rhythms — the pho stall that sells out by ten in the morning and closes; the river that fills with morning fishing boats and empties by noon; the lantern district that comes alive only at dusk and only on certain days. The traveler who tries to see Hoi An at eleven in the morning will see a hot dusty town with closed shopfronts. The traveler who walks Hoi An at six in the evening will see something that explains why people come.

This is not a country to rush. The shape of the trip — fourteen days for five real stops — is already pushing against the country's preferred pace. Going faster is not getting more; it is getting less, in a slightly different arrangement.

Related guides.

• The Two-Cities Rule — when to stop adding stops
• A Tokyo Weekend
• Asia regional hub