eSIM for Thailand: The Airport Counter Is the Rival

Thailand is the cheapest market priced on this site, on both the headline rate and the typical one, and the headline is the least useful number on the page. A typical Thai gigabyte costs $1.05, against $1.15 in Poland and $1.29 in Portugal, so the cheapness runs across the whole catalogue rather than sitting on one advertised plan.

The purchase decision here is not really about beating a price. It is about beating a counter that is already good. Thailand is one of the few countries where a traveller can land, queue for ten minutes, hand over a passport and walk out with unlimited data and a Thai number for a sum that a travel eSIM struggles to match at the same length. The eSIM wins on something else, and being clear about what is the whole job of this page.

The prices below are recomputed from the 188 Thailand plans ten brands sell, on a snapshot taken on 24 October 2026. Operator prices come from the operators, converted at the European Central Bank reference rate for 23 October 2026 of 33.75 baht to the dollar, so the comparison can be checked line by line.

Is the airport SIM really the cheaper option

Usually yes, and the size of the gap is smaller than the argument about it suggests. AIS publishes its tourist range openly, which makes it the easiest counter to price against.

Set that against this market. The cheapest unlimited plan here that covers fifteen days costs $29.00, so the counter is 29 per cent cheaper over that window and it throws in a Thai number. The cheapest unlimited plan covering thirty days costs $33.00, which undercuts the counter by $2.53, and it is the only window where the eSIM wins on money at all.

What the top of this market does to that comparison is worth stating plainly. Holafly sells one product, unlimited data, from $11.90 for three days to $73.90 for thirty. At thirty days it costs 2.08 times what AIS charges for the same window, and the AIS pack includes calls and a local number.

So the honest summary is narrow. On a two-week holiday the counter is cheaper. On a month the cheapest eSIM is cheaper by the price of a coffee. On the brand most travellers search for by name, the eSIM is twice the counter.

That leaves the non-price argument, which is the one that actually decides it. The counter costs a queue, and the queue is worst on a late arrival, when the desks are thin and the first thing needed is a ride to a hotel. The eSIM is on the phone before the aircraft door opens, needs no passport handed over at a desk, and leaves the home line in its slot for the bank code that arrives at customs. Those three things are what the money buys.

The registration itself is not the obstacle people expect. Every Thai number is registered to an identity under NBTC rules, and a passport covers it. AIS states the rule that follows: a tourist SIM used beyond sixty days needs the identity confirmed again, and a number must be activated within sixty days of registration. None of that affects a two-week stay.

What the counter includes that no eSIM does

A Thai number, calls to Thai numbers, and a person standing in front of you for the length of the trip. The first two are worth something only to a traveller who needs them, and the third is worth something to anyone whose phone is old or whose trip is long.

What the 24 cent gigabyte actually buys

It buys ten days. The cheapest gigabyte sold into Thailand is $0.24, and it comes from a 50GB plan at $12.00 that expires after ten days. That is the lowest per-gigabyte rate in any of the fifty markets priced here, and the next lowest is France at $0.30 on a 240GB annual plan.

The same $12.00 buys a different product from a different brand. Ubigi sells 20GB over thirty days for $12.00, which is $0.60 per gigabyte, and Roamic sells 10GB over thirty days for $9.00.

Nothing about this is deceptive, and the seller prints the window next to the price. What goes wrong is the arithmetic a reader does at speed. A rate per gigabyte looks like a property of the country rather than of the plan, so the $0.24 gets remembered as the price of Thai data when it is the price of a ten-day block.

Where the ten day window breaks a three week trip

On day eleven, with the allowance unspent. A 50GB plan that covers ten days is built for a heavy short trip, and the volume that survives the expiry is lost rather than carried.

The market does sell a 50GB month, at $27.50 from Airalo, which is $0.55 per gigabyte. That is 2.3 times the headline rate and it is the correct purchase for anyone staying three weeks. The cheap number is not wrong. It is scoped.

What a month costs when the window is fixed

The table prices the shelf by the window a trip needs rather than by the rate, which is the only comparison that survives a flight change.

The pattern that matters is not the falling daily rate. It is the row at seven days. The cheapest plan that carries 5GB in this market costs $4.50, and it lasts one day. For fifty cents more, a traveller gets a plan with twenty extra days of validity, so the advertised 5GB price is the one purchase nobody on a week-long holiday can use.

Bigger sizes behave the same way. A 10GB month starts at $9.00 and a 20GB month at $12.00, so $3.00 moves the trip up a whole class. That is why the sizing question in Thailand is easy and why it does not deserve the worry it gets.

One row in that table is not for a holiday. A 24GB plan with 365 days of validity at $22.00 is $0.06 a day, and it is built for someone who lives in the country or returns four times a year. It is in the table because it is the cheapest per day by a wide margin and because a reader will find it anyway. For a fortnight it is 24GB bought to use two of them.

The flat-rate shelf is where the money stops being small. 99 of the 188 plans are sold as unlimited rather than metered, which is 52.7 per cent, and the cheapest unlimited month is $33.00 against $12.00 for 20GB. A traveller whose trip fits inside 20GB pays 2.75 times as much for the privilege of not counting.

Which brand is cheap and which is only cheap once

The best rate column hides more here than in most markets, and Nomad is the reason. It holds the cheapest gigabyte in fifty countries with one plan, and its typical metered gigabyte across its seven Thai plans is $1.60, which is 52 per cent above the Thai median of $1.05. A brand can be the cheapest on the shelf and dearer than average everywhere else on the same shelf. Buy it for the 50GB ten-day block and nothing else.

Airalo is the interesting middle. Its best rate of $0.55 comes from the 50GB month at $27.50, so the rate and the useful product are the same purchase, which is not true of Nomad’s number. Its 10GB month at $11.00 sits above Roamic’s $9.00, and its unlimited month at $49.00 is above Nomad’s $33.00.

Jetpac holds the two most misleading prices in the file. Its 5GB costs $4.50 and its 10GB costs $6.50, both cheaper than anything comparable, and both last a single day. The plans are real and useful to someone with a long layover. They are not week-long plans, and the table in the previous section is the one to buy from.

Saily is the second dearest brand at the top end, with an unlimited month at $71.99, and its best metered rate of $1.00 is just under the market median. Holafly again has no metered plan to rate, and its ceiling of $73.90 is the highest price sold into the country.

The unlimited shelf is not one product either, and the daily figure behind it decides more than the price does. Roamic publishes 3GB a day at full speed and 1 Mbps afterwards, the same number on every plan. Saily publishes 5GB a day, the most generous figure in this file. Airalo and Jetpac publish 3GB, Nomad publishes 2GB, and aloSIM slows to roughly 512 Kbps once a daily allowance of 1.5 to 2GB is spent. Yesim states a threshold between 500MB and 2GB depending on the plan, Ubigi varies it plan by plan, and Holafly publishes none, with independent testing in early 2026 measuring 500MB to 1GB a day.

Read the two ends of the flat-rate shelf against that. $33.00 at Nomad buys 2GB a day at full speed. $73.90 at Holafly buys between a quarter and a half of that, measured. The plan at $73.90 delivers a quarter to a half of what $33.00 delivers inside a single day, so the premium here buys recognition rather than throughput.

Does a Thai number change the answer

For most trips, no, and the list of things that stay closed is shorter than the list that stays open. Ride hailing runs through Grab and Bolt on the account a traveller already holds. Messaging runs through Line on the home number. Hotel and restaurant contact runs by email or through the same apps.

What a Thai number opens is the local layer underneath. A restaurant that confirms by local text, a guesthouse on a small island that calls back, a delivery rider who needs to reach the person waiting at a gate, and the merchant accounts that are built on Line rather than on an international app.

Where Thailand differs from almost everywhere else is the price of closing that gap. Fifteen days of unlimited data and a Thai number cost 699 baht at the counter, which is $20.71, less than the cheapest unlimited eSIM covering the same window at $29.00. In most markets the counter is a fallback. Here it is a purchase worth making on purpose.

The trade is precise. The counter costs the queue and the passport handover, and it gives back a number and calls. The eSIM costs nothing at the airport and gives back neither.

What happens on the islands

Coverage holds in the resorts and fails on the water. The gaps sit on the crossings rather than inside the destinations, and a longtail between two islands is where the connection goes.

No purchase changes that. Every brand here rides all three networks, so a traveller cannot buy deeper island reach by picking a seller, and the difference between the three is not the variable that decides whether a phone works on a boat. What decides it is distance and terrain.

The preparation is therefore around the handset. Map tiles saved for offline use before the crossing, a screenshot of every booking that cannot be redone, and a power bank, because a phone hunting for a weak signal on open water empties far faster than one on a strong cell.

One habit is worth forming on the mainland. Install the profile and confirm it works while a shop with wifi and a mains socket are both nearby, rather than discovering a problem on a pier with a boat leaving in ten minutes.

Where the plan dies on day eleven

A plan sold against a date does not care about the return flight. Ten days is ten days, and an extension is a second purchase rather than a top-up to the first.

That is a different mechanic from a Thai prepaid line, where extra credit is bought over any 7-Eleven counter for cash and lands on the same number. A travel eSIM has no counter. Extra data is bought inside the seller’s app, arrives as a new profile, and needs a live connection at the moment of purchase, which is an awkward requirement for a product whose purpose is to supply one.

Two habits follow. Size the first plan for the whole stay rather than for the first week, and treat any mid-trip purchase as a rescue. A plan that expires by date rather than by volume is wasted the moment a return flight moves by a week, and moved flights are common on island itineraries. And check before paying whether the seller offers an add-on or only a second profile, because the two are different prices and only one of them keeps the same window.

The install guide covers the in-app route, and the fair-use table sets out what the unlimited plans do once a day’s allowance is gone, which is where a flat rate stops behaving like one.

Which network does the profile ride

Thailand runs on three networks and every brand in this file rides all three, which the data records for all 188 plans. The choice at checkout is therefore not a network choice.

AIS sells its own tourist pack as an eSIM alongside the plastic card, so the counter and the profile are the same product sold two ways. That is unusual, and it is the reason this page compares against a counter price rather than dismissing it. The pack carries a Thai number and calls, which no travel eSIM here does at any price.

What a travel eSIM adds is the arrival and the switch. Data is live before the baggage belt, the home line stays in its slot, and there is no desk that closes before a delayed flight lands. The carrier profiles show where the three networks diverge, and the network data names the measurement behind each claim.

Can you install it before you land

Yes, and it should be installed at home. The profile sleeps until it first registers on a Thai network, so installing a fortnight early costs nothing and is the only way to find a handset that refuses it while there is still time to change something.

Three settings decide what happens after landing. Name the profile, because two lines both called Travel is a coin flip in a settings menu. Point mobile data at it and leave roaming on, since a travel plan registers as a visitor. Leave the home line enabled for texts with its own roaming off, so it cannot bill a data session nobody ordered.

Emergency calls are the exception to all of it. Dialling 112 works on any network the handset can register, plan or no plan.

Who fixes a dead profile in Bangkok

The seller, from another time zone, and the first day is when that works best. A profile reported inside twenty-four hours is usually replaced at no charge because it is measurably unused. The same report on day six meets a plan that has already run.

What to send is short. The order number, the handset model, the step it fails at and a photograph of the settings screen. The order number matters more than the QR code once a profile has been deleted, because deletion is not a repair and there is no undo in the handset.

Two failures look like seller faults and are not. Data pointed at the home line is the most common, and roaming switched off for the profile is the second. Both take under a minute and both are worth ruling out before writing.

Does the plan follow you to Laos and Vietnam

No, unless the product names the country. A Thailand-only plan stops at the border, and the Bangkok to Vientiane or Ho Chi Minh City leg is common enough that this catches people every season.

Two routes fix it. A regional bundle whose country list includes both, or a second profile bought before the crossing and kept switched off. The bundle is convenient and it is priced for its widest country, which in South East Asia usually means it costs more than two single-country plans, because Thailand is the cheapest market in the region. The Vietnam table prices the eastern leg and the Asia coverage list shows which bundles name which countries.

The cheapest answer for a Thailand trip with three days in Laos is usually a small Lao plan next to the Thai one, bought in advance. The comparison by trip length sizes the Thai half against the days actually spent in the country, which is the number a two-country route changes.