Best eSIM for South Korea in 2026: Every plan size priced

HelloRoam carries South Korea data on LG U+ and SKTelecom 5G, allows mid-trip top-ups, and covers 185 destinations on one profile. Ubigi holds the lowest 10 GB price of the six providers below, at $14.00 for 10 GB over 30 days. Nomad prices 50 GB over 30 days at $39.00 for long postings.

Three nights in Seoul needs maps, taxis, translation and a full inbox. That is $7.99 for 3 GB over 30 days, paid before the flight. Ten nights of video calls to London wants $17.99 for 10 GB over 30 days. A month-long posting with a tethered laptop is a third size again.

The plan you want is set by which of those trips you are on, not by which brand ranks first.

Six South Korea eSIM plans ranked, with the host network in every row

Validity is held at 30 days wherever the provider sells it, so the sizes compare. Holafly is quoted in days, because it bills unlimited data by duration and has no size to pick. Every provider below publishes a South Korea host network, so all six can be compared on that column.

The rows below are not sorted on price. Ubigi prices the 10 GB month lower than anyone here, at $14.00 for 10 GB over 30 days, and it still comes second. What places a row is the kind of Seoul trip the shelf behind it was built for, and the final column spells that out.

The HelloRoam Travel Data Price Index, August 2026

Method: published South Korea prices in US dollars, sampled August 2026. Host networks come from each provider’s own South Korea listing. Prices change without notice.

All six providers here ride the same two host networks, LG U+ and SKTelecom, so no seller can offer reach the others cannot.

The table opens with HelloRoam, and its South Korea eSIM plan sizes each show a host network, SKTelecom or LG U+.

Each provider handles a different kind of Seoul trip

1. HelloRoam: six Korean sizes, every one open to a top-up, at $9.99 for 5 GB over 30 days

HelloRoam is a London-based travel eSIM platform selling South Korea data in six sizes on LG U+ and SKTelecom 5G. The ladder opens at $3.99 for 1 GB over 7 days and closes at $55.49 for 50 GB over 30 days.

Between those sit four steps: 3 GB, 5 GB, 10 GB and 20 GB, all over 30 days. That is the widest fixed-data range in this table, which matters when a trip runs five nights rather than a round number.

Every plan in that range takes a top-up. The con is the ceiling. At 50 GB over 30 days, HelloRoam is the most expensive option here.

2. Ubigi: the lowest 10 GB rate here and the only 25 GB step, at $14.00 for 10 GB over 30 days

Ubigi holds the lowest 10 GB price in the set, at $14.00 for 10 GB over 30 days. Its $25.00 for 25 GB over 30 days is the only plan of that size anyone here sells.

That middle step is genuinely useful. A fortnight of client calls needs more than 10 GB and nothing like 50 GB.

The range has holes, though. Ubigi sells no 5 GB or 20 GB plan for South Korea. Its 3 GB option runs only 7 days, so a short trip either overbuys at 10 GB or accepts a tight window.

3. Nomad: the cheapest 50 GB month for a tethered laptop, at $39.00 for 50 GB over 30 days

Nomad prices the largest plan in this table lowest, at $39.00 for 50 GB over 30 days. For a month in Seoul with a laptop running off the phone, that is the buy.

Its middle sizes track the market rather than lead it, at $10.00 for 5 GB over 30 days and $18.00 for 10 GB over 30 days.

Nomad is weakest at the short end. A three-night trip takes $4.00 for 1 GB over 7 days or steps up to a 30-day plan it will never finish.

4. Airalo: four validity windows from three days to a month, at $19.00 for 10 GB over 30 days

Airalo sells the widest choice of trip lengths for South Korea, with 3, 7, 15 and 30-day validity. A three-night trip can buy $8.00 for 3 GB over 3 days instead of paying for a month nobody uses.

Airalo splits 10 GB three ways: $18.00 for 10 GB over 7 days, $18.50 for 10 GB over 15 days and $19.00 for 10 GB over 30 days. Nobody else prices duration that finely.

You pay for the choice. At every size this table compares like for like, another provider comes in lower.

5. Holafly: a Seoul trip metered in days, at $27.50 for unlimited data over 7 days

Holafly sells unlimited days rather than gigabytes, so it never belongs in a per-GB comparison. A week costs $27.50 for unlimited data over 7 days and a fortnight costs $50.50 for unlimited data over 15 days.

Nothing runs down and nothing can be stepped back to, which suits a visit that nobody wants to meter.

6. Saily: one 30-day window from 3 GB to 20 GB, at $18.99 for 10 GB over 30 days

Saily keeps a single window across its Korean range, from $8.99 for 3 GB over 30 days up to $29.99 for 20 GB over 30 days.

The ceiling is the problem. Nothing sits above 20 GB, so a month-long posting on heavy data has nowhere to go, and at $10.99 for 5 GB over 30 days it leads at no size here either.

SKTelecom and LG U+ carry the signal from Incheon to Busan

Every provider above rides LG U+ and SKTelecom 5G. That is not a HelloRoam advantage, and it is not Airalo’s either.

Travel eSIM companies do not build masts in South Korea. They resell capacity on the two networks that already cover it, which is why the host network column repeats.

So any claim that one eSIM has better South Korea coverage than another falls apart at that column. A KTX run from Seoul to Busan behaves the same whichever of the six you bought. Judge them on plan size, duration, top-up and price.

A UK phone bill shows the Korea roaming cost long after the meetings end

The cost of a Korean trip on a UK contract never shows up at the time. It lands on a personal mobile bill weeks later, gets expensed as a round number, and is signed off because it looks small.

South Korea sits outside the Europe zone that most UK tariffs cover. The day passes you rely on for Munich or Milan usually do not apply there. Out-of-zone rates are set network by network and tariff by tariff, and they change without notice. Read your own contract before the trip is approved.

A local Korean SIM fixes the price and breaks something else. It replaces the SIM in the handset, so your UK number goes quiet all trip. Two-factor codes for banking and internal systems keep arriving at a number nobody is holding. A travel eSIM sits alongside the UK SIM instead.

Three nights, ten nights and a full month need three different plan sizes

Sizing is the decision that costs money, and most people miss in the same direction.

Three nights of maps, taxis and email is light work. $7.99 for 3 GB over 30 days covers it, and the 30-day window survives a delayed return.

Ten nights of daily calls to London is the middle case. Start at $17.99 for 10 GB over 30 days.

A month-long posting is the heavy case. $28.49 for 20 GB over 30 days handles ordinary work. $55.49 for 50 GB over 30 days handles a laptop tethered all day.

Buy the size below your guess, not above it. Adding data costs less than a plan you never finish.

HelloRoam is the wrong buy for a month-long posting on heavy data

At the top of the range, HelloRoam loses on price. Nomad sells 50 GB over 30 days at $39.00 and Airalo sells 50 GB over 30 days at $49.00. HelloRoam asks $55.49 for 50 GB over 30 days.

All three ride LG U+ and SKTelecom, so no coverage argument closes that gap. Send someone to Seoul for a month with a tethered laptop and Nomad is the sensible purchase.

HelloRoam’s case is everything below that ceiling, where six plan sizes and a top-up on each of them decide the bill.

Running out of data in Gangnam costs a top-up, not a second plan

Every HelloRoam South Korea plan accepts a top-up, with no exceptions in the range. That matters on the Tuesday of a heavy week, when 5 GB has gone by lunchtime.

Without a top-up, the only move is buying a second plan and paying twice for the same days. With one, you add data to the profile already in the phone and carry on.

It also changes how you buy. When a top-up is available you can size down with confidence, and sizing down is the cheaper mistake.

The same profile covers the Tokyo leg without a second purchase

Trips to Seoul rarely stop in Seoul. A Tokyo leg or a Singapore stopover gets bolted on a week before departure.

One HelloRoam profile works across 185 destinations, so the second country is a plan change rather than a fresh install at an airport. The QR code scanned in London stays where it is.

One caveat. The GLOBAL plan reaches 128 destinations rather than all 185, so check the country you are adding.

The e-SIM profile installs on office Wi-Fi the week before the flight

Do this at a desk, not at a departure gate.

1. Confirm the handset supports eSIM. Most business phones bought in the last few years do.
2. Buy the plan and scan the QR code on office Wi-Fi. Installation needs a connection.
3. Set the e-SIM as the data line and leave the UK SIM on for calls and texts.
4. Switch data roaming off on the UK line so nothing bills twice for the same day.

HelloRoam‘s Android install guide covers each step on office Wi-Fi, so the profile is live before anyone reaches Incheon. File the receipt at purchase, while it is a dated document.

South Korea e SIM questions UK business travellers ask before booking

When should I install my eSIM before flying to South Korea?

Install it on office Wi-Fi in the week before you fly. Downloading the profile takes a working connection, and a 6am terminal hotspot is not something to rely on. Going early leaves time to confirm the handset supports eSIM.

How much do roaming charges usually cost?

That depends entirely on your own UK contract, and South Korea sits outside the Europe zone most UK tariffs cover. Rates beyond that zone are set per network and per tariff, and change without notice. Read your contract’s non-Europe page, not a headline figure.

Is an e-SIM more expensive than roaming with a home carrier?

You cannot answer that without your own tariff, because UK out-of-zone rates vary by network and plan. An e-SIM gives you a fixed number in advance: $9.99 for 5 GB over 30 days, paid before departure. Price that against your contract’s non-Europe rate.

Are e SIMs better than physical SIMs for business travel?

For business travel an e SIM has one clear advantage: the UK SIM stays in the phone. Calls, texts and two-factor codes keep arriving on your UK number while the e SIM carries data. A physical Korean SIM replaces it, which is where codes go missing.

Does South Korea support eSIM?

Yes. South Korea supports eSIM, and travel plans there run on LG U+ and SKTelecom 5G. Your handset needs eSIM hardware, which most business phones bought in the last few years have. Check your own device before buying.

Can I get a refund on an e-SIM before I travel?

Every HelloRoam plan carries a 180-day money-back guarantee, running six months from the date of purchase. That covers a cancelled trip, a handset that turns out not to support eSIM, and wrong dates. Other providers set their own terms.