Bangkok to Nong Khai Train 894 Baht: Thailand Budget Travel

A second-class berth on the overnight train from Bangkok to Nong Khai costs 894 baht, carries you more than 600 kilometres while you sleep, and cancels a night's hotel bill on the way. At 33.77 baht to the US dollar that is $26.47, and it is one of the best-value moves in Thailand budget travel — as long as you buy it at the right window and pick the right bunk.

This budget travel guide prices the run north for November 2026: every class on trains 25 and 133, what the resale sites add on top, why flying to Udon Thani is not the shortcut it looks like, and what it costs to carry on over the Mekong into Laos. Every figure below is in baht first, because that is what you will actually hand over.

Thailand budget travel on rails: every Bangkok to Nong Khai fare

Everything leaves from Krung Thep Aphiwat Central Terminal, not the old Hua Lamphong. Train 25 pulls out at 20:25 and reaches Nong Khai at 06:25. Train 133 follows at 21:25, arrives at 07:55 and is the one that continues across the river. Train 75, a diesel railcar, runs the route in daylight from 08:45 to 17:30 with seats only.

Read the units before you compare. The first four rows are one person, one seat or one bunk. The last row is a fare plus two connections.

Option	Cost (THB)	Time	Notes
3rd class fan seat, day train	about 250	8.5–11 hr	Cheapest seat north; no bed, no air-con
2nd class air-con seat	453 via a booking site	~10 hr	Reclines, does not fold flat
2nd class sleeper, upper berth	894 (898 on train 25)	10–10.5 hr	The budget pick
2nd class sleeper, lower berth	994 (998 on train 25)	10–10.5 hr	Window, and further from the air-con
1st class, berth in a shared cabin	1,350 upper / 1,550 lower	10 hr	One carriage per train; sells out first
1st class cabin, sole occupancy	2,350	10 hr	Lockable door, washbasin, hot shower
Overnight bus from Mo Chit	540–714	9–11 hr	A reclining seat is not a bed
Fly to Udon Thani, then ground transfer	from about 1,012	1 hr flight + 2–3 hr	And you still pay for a Bangkok bed

The 100-baht berth question

Lower berths cost 100 baht more on every second-class sleeper in the country, and they sell out first. You get a window, a wider mattress and distance from the air-conditioning vents. Upper berths are narrower, colder and have no view, but at 894 baht they are the cheapest flat bed moving anywhere in Thailand that night. Pack a long-sleeved layer either way: the carriages run cold, and the blanket supplied is thin.

The quiet markup: counter price against booking-site price

This is where Thailand budget travel is quietly won and lost. The State Railway fare is fixed. The resale sites are not. A second-class air-con sleeper to Nong Khai sold through a third-party booking platform lists at 958 baht against the 894 printed on the official fare table, and first class at 1,517 against 1,350. That is 64 and 167 baht of pure convenience fee for the identical bunk on the identical train.

Booked for two people in first class, the gap is 334 baht — roughly two plates of cheap food in Bangkok before you leave. It is worth paying when the train is nearly full and you want the seat guaranteed from abroad; it is not worth paying if you are already standing in Bangkok with three days of slack in your plan.

Why flying to Udon Thani costs more than it looks

Udon Thani is the nearest airport and the fare looks tempting: low-cost carriers advertise the hop from Bangkok from around 932 baht one way. The problem is everything after the wheels touch down. There is no direct public minivan from the terminal to Nong Khai. You take the airport shuttle into Udon Thani bus terminal for 20 baht, then a local bus on to Nong Khai for 40 to 60 baht over 50 to 70 minutes. Total: about 1,012 baht and three hours from gate to Mekong, on top of the trip out to the airport in Bangkok.

A taxi straight from the airport to the Friendship Bridge removes the faff and adds 500 to 800 baht, taking the real cost past 1,700. And because the flight runs in daylight, you pay for a Bangkok room the night before. Count that at a modest 700 baht and the sleeper is roughly 800 baht cheaper door to door — about $24 a person, or two days of food on an average cost per day Thailand budget.

Over the Mekong: the 20-baht shuttle and the 40-baht bus

Nong Khai is the gateway to Vientiane, and this is the stretch where Thailand budget travel pays for itself twice over. The crossing is cheap if you ignore the agents at the station. Three ways over the First Thai–Lao Friendship Bridge:

Crossing	Cost (THB)	Notes
Shuttle train, Nong Khai to Thanaleng	20	Trains 481 and 483, 07:30 and 14:45, 15 minutes
Through train to Vientiane Khamsavath	70 (3rd) / 120 (2nd)	Lands you in the city, not a field
Shuttle bus over the bridge	30–40	Every 10–20 minutes from the bus station
Tuk-tuk, Nong Khai station to the bridge	about 100	Agree the fare first
Lao visa on arrival	US$40 cash	Passport photo required; crisp notes only
Exit fee leaving Laos	40 (or 10,000 kip)	Payable at the border, cash

Thanaleng station is 13 km short of central Vientiane, so the 20-baht shuttle is only the bargain it appears if you are happy paying for a ride at the other end. The through service to Khamsavath, at 70 baht in third class, usually wins once the taxi is priced in.

Money exchange Thailand-side before you cross

Do the money before the bridge, not after. The Lao visa on arrival wants US dollars in good condition, and the booths at the border give some of the worst rates on either side of the Mekong. Buy your dollars at a licensed changer in Bangkok, where the margin on a Thai baht exchange is a fraction of a per cent rather than several, and carry them across untouched. Our Thailand money exchange finder and baht rate checker lists the branches, including the SuperRich Thailand counters, so you can compare before you hand anything over.

Cash matters on this route for a second reason: the station ticket windows, the shuttle train, the bridge bus and the Lao border are all cash-only. Withdrawing at a Thai ATM costs 220 baht a time in foreign-card charges on top of your own bank's cut, so one larger withdrawal in Bangkok beats three small ones in Nong Khai.

Bottom line: the savings summary

Done the cheap way, Bangkok to the Lao border costs 894 baht for the upper berth plus 100 for the tuk-tuk plus 40 for the bridge bus — 1,034 baht, or $30.62, with a bed included. Booked through a resale site in first class with a taxi at the far end, the same morning arrival costs 1,517 plus 800, or 2,317 baht — $68.61. Flown via Udon Thani with a Bangkok hotel night attached, it runs past 2,200 baht and takes most of a day.

Three savings worth banking: buy the berth at the station window rather than a resale site and keep 64 baht; take the upper bunk and keep 100; skip the Udon Thani flight and keep roughly 800 once the hotel night is counted. That is about 964 baht, or $28.55, for three decisions that cost nothing but ten minutes of reading — which is Thailand budget travel in a single sentence. Feed the numbers into our free Thailand trip cost calculator and you will see what the same discipline does across a two-week trip.