Udon Thani to Ko Samui runs about 1 times a day, with the first departure around 07:30 and the last around 07:30. One passenger pays €103.74, every fee included. The fastest door to door is 7h 9m over 962 km, on services run by 2 operators across 1 mode.
What one seat costs
Every operator we hold on this corridor starts at €103.74, so there is no spread to show.
Typical fares · Priced for 13 October 2026
€103.74
- 216%Moves across the booking window
216%When it runs, leaving Udon Thani
Typical first and last departure on this corridor.
- 07:30First departure
- 07:30Last departure
- 1Services per day
- 0%Run direct
07:30
07:30
1
0%Departure times on this route
12Go lists the departures it sells between Udon Thani and Ko Samui.
Partner link. The seller pays us a commission when a booking completes, and it never changes what you pay.
Fares by date
What this journey usually costs, by departure date. It shows which days run dearer.
Typical fares
- about €303.94Thu24
- about €228.59Fri25
- about €250.59Sat26
- about €185.14Sun27
- about €136.74Mon28
- about €133.44Tue29
- about €171.94Wed30
- about €174.69Thu1
- about €115.84Fri2
- about €146.09Sat3
- about €157.64Sun4
- about €124.09Mon5
- about €108.14Tue6
- about €118.04Wed7
- about €146.64Thu8
- about €106.49Fri9
- about €129.59Sat10
- about €120.24Sun11
- about €106.49Mon12
- about €103.74Tue13
- about €110.89Wed14
Based on what this route has cost recently. The live fare is confirmed when you book.
The train gets you into Ko Samui. These two partners take it from there, and the bed is theirs to book.
A room in Ko Samui for the night the train gets in
Sort by distance from Bus Terminal and you can see which places are ten minutes on foot and which are not.
Search Ko Samui on AgodaOr compare on Booking.com
Partner links. We earn a commission when a booking completes, and it never changes what you pay.
When to book Udon Thani to Ko Samui
The same search run across the whole booking window, so the shape of the curve is visible rather than described.
- €103.1990 days
- €96.0460 days
- €106.4945 days
- €115.2930 days
- €110.8921 days
- €118.0414 days
- €171.947 days
- €250.593 days
- €303.941 days
- Cheapest lead time
- Fares bottom out around 60 days ahead, at €96.04.
- How much it moves
- The gap between the cheapest and dearest lead time is 216 percent. The dearest point is €303.94, 1 days out.
- What that means
- Today sits inside the cheap window, which closes about 60 days before departure. Waiting from here has usually cost money on this corridor rather than saved it.
Book now Fares on this route are lowest around 60 days ahead. You are inside that window.
This corridor, specifically
Facts that apply to Udon Thani to Ko Samui and to no other route on the site.
Clocks
Both ends keep the same time, so the arrival is the departure plus the journey.
The shape of it
962 km
929 km as the crow flies, 4% further by the route services take. The bearing runs south.
Who lives at each end
130,531 → 50,000
Population at the departure city and at the arrival city, which is usually what decides how often anything runs.
The route
What the journey looks like
Direct or connecting, how far the route really runs, and what happens when a connection is missed.
- Direct or connecting
- 0% of the services we sell on this corridor run through without a change. The remaining 100% involve one connection.
- How far it really runs
- The route covers 962 km against 929 km in a straight line, a detour of 4 percent. Track and road geometry account for the difference.
- Where the change is
- Connections are made at Bangkok. The gap between arriving and leaving is 52 minutes, of which about 14 is walking.
- If the connection is missed
- The tightest connection we sell here has a 18 percent chance of not being made on the timetable alone. Part of this journey is a self transfer between separate tickets, so leave more time than the minimum and expect to check in again.
The fare from USM into Ko Samui is set by whoever drives it.
A car waiting when you land in Ko Samui
Settled in advance, so the ride into Ko Samui costs what it said it would rather than what the rank says.
Book a transfer from USM with Daytrip
Partner links. We earn a commission on a booking, and the fare is the same as going direct.
Who runs this route
Ko Samui is small enough to see in an afternoon, which is easier without the luggage. Storing it is not our business.
Left luggage near Bus Terminal
Most of the points near Bus Terminal open before the first train and shut after the last one.
Check Ko Samui on StasherOr try Bounce
Partner links. We earn a commission on a booking, and the price is the same as going direct.
Questions about Udon Thani to Ko Samui
The questions people actually ask about this journey, answered from the same prices and times the page above is built on rather than written once and left to go stale.
How long does it take to get from Udon Thani to Ko Samui?
The fastest journey from Udon Thani to Ko Samui takes 7h 9m door to door, of which 4h 21m is spent moving, on the train. Most services take around 7h 24m, because that average includes slower stopping services and journeys with a connection. Times include reaching the terminal and leaving it at the far end.
How much does it cost to travel from Udon Thani to Ko Samui?
The cheapest fare from Udon Thani to Ko Samui is €103.74, as of 23 September 2026. A typical fare across the next three weeks is €133.44. Both figures are the total for one passenger, including taxes, supplier fees and our service fee, so nothing is added at checkout.
What is the cheapest way to get from Udon Thani to Ko Samui?
The cheapest way from Udon Thani to Ko Samui is by train, at €103.74 for one passenger on 13 October 2026. That journey takes 7h 10m door to door. Cheaper is rarely faster on this corridor, and the comparison table on this page shows what each mode costs against what it saves.
When should I book Udon Thani to Ko Samui?
Fares from Udon Thani to Ko Samui bottom out around 60 days before departure, at €96.04. Across the whole booking window the gap between the cheapest and the dearest lead time is 216 percent, measured on 23 September 2026. Booking inside the last week has consistently cost more on this corridor.
Which day of the week is cheapest for Udon Thani to Ko Samui?
Tuesday is the cheapest day to depart from Udon Thani to Ko Samui, at €108.14. That is the median of 21 priced departure days across the next three weeks, as of 23 September 2026. Shifting a departure by one day is usually worth more than shifting the booking by one week.
Which month is cheapest for Udon Thani to Ko Samui?
February is the cheapest of the next 5 months to travel from Udon Thani to Ko Samui, at €69.09 for one passenger. Each month is priced on its fifteenth, so the comparison is like for like rather than a mix of weekends and midweek departures.
Who runs services from Udon Thani to Ko Samui?
2 operators sell services from Udon Thani to Ko Samui across 1 mode: Bangkok Airways, การรถไฟแห่งประเทศไทย. Journey times, fares and fare conditions differ between them, and the operator table on this page compares all of them on speed, flexibility and what is provided on board.
Is there a direct service from Udon Thani to Ko Samui?
0 percent of the services we sell from Udon Thani to Ko Samui are direct. The rest connect at Bangkok, with about 52 minutes between the two services. Both legs are sold on one booking, so a missed connection is rebooked at no charge.
Which station or terminal do services from Udon Thani to Ko Samui use?
Services from Udon Thani to Ko Samui by train leave from Udon Thani Railway Station and arrive at Samui International Airport USM. Allow about 1h 57m in total for reaching the departure terminal and leaving the arrival one, which is already included in every door to door time on this page.
Can I change or refund a ticket from Udon Thani to Ko Samui?
1 of the 2 operators we sell from Udon Thani to Ko Samui allow a change or a refund. A change on a changeable fare costs €5.00. The operator table on this page names which is which, and the condition is shown again before you pay.
Where these numbers come from
Places, coordinates, operators, which operator serves which pair, and every distance on this page are real and come from open data. Where a corridor has a filed timetable the departure times are real too, and ferry fares are the prices the operators publish themselves.
Observed service A carrier record names this operator on this pair, carried through unchanged.
Prices come from the supplier wherever we hold a live quote. Elsewhere we show an indicative price built from the real distance, the real operator and a fare curve over lead time, day of the week and season. Those are labelled Estimated fare and cannot be booked.
Defined in full at Door to door, Fares, The booking window, Carbon, Distances
- On this page
- Every figure above was computed for Udon Thani to Ko Samui on 23 September 2026: 962 km of route against 929 km in a straight line, 1 services a day, 2 operators a cheapest fare of €103.74, and 7h 9m door to door on the fastest mode. The return direction is computed separately and its numbers are not these numbers.
Being on the water gives Ko Samui a set of days out that do not start at a station.
Day trips out of Ko Samui and across Thailand
Day trips that leave Ko Samui in the morning and cover a good part of Thailand by evening.
See Ko Samui on KlookOr browse GetYourGuide
Partner links. We earn a commission on a booking, and it never changes the price.
The two ends, compared
Udon Thani reaches 66 places in 2 countries on services we hold, over distances from 36 to 1,184 km. Ko Samui reaches 40 places in 16 countries, from 36 to 9,333 km.
Other ways to make this journey
Leaving Udon Thani
- 66Places you can leave for
- 2Countries
- 9Operators
2
9Arriving in Ko Samui
Leaving Ko Samui
- 40Places you can leave for
- 16Countries
- 4Operators