The Cheapest eSIM for South Korea in 2026

Among the providers in this comparison, HalfSIM has the lowest-priced 1GB plan at $1.75, as well as the lowest-priced 7-Day Unlimited plan at $12.88. A 1GB plan, however, is really only suitable if you expect to rely on Wi-Fi most of the time and use mobile data sparingly. For everyday use of maps, messaging, and search, 3–5GB is a more practical range.

A trip to South Korea comes with plenty of expenses, from flights and accommodation to food and transportation. You can’t cut every cost, but mobile data is one area where a little comparison can save you money. This guide looks beyond the lowest advertised price to compare what you would actually pay based on how much data you are likely to need over a 7-day trip.

Quick Answer: What Is the Cheapest eSIM for South Korea in 2026? 

[Compare HalfSIM Plans for Your Korea Trip →]

At $1.75, HalfSIM’s 1GB plan is the cheapest option in this comparison. It makes the most sense for travelers who expect to rely on Wi-Fi almost everywhere and only need mobile data occasionally for things like maps or messaging. If you plan to use maps, messaging, and search every day, 3–5GB is a more practical range: HalfSIM’s 15-day 3GB plan is the cheapest at $4.25, while Airalo and Nomad tie for the lowest 5GB price at $10.

If you need more data, the price gap changes again. HalfSIM’s 10GB plan costs $11.75, compared with $12.88 for its 7-Day Unlimited plan—a difference of just $1.13. If you are already looking at around 10GB, the Unlimited option is worth comparing too. The key is to estimate how much data you are likely to use first, then compare the total cost of plans within that range rather than simply choosing the lowest advertised price.

How We Compared the Cheapest Korea eSIMs

We used a 7-day trip to South Korea as the benchmark and checked the prices listed on each provider’s official website. Fixed-data and Unlimited plans were compared separately.

For fixed-data plans, we compared equivalent 1GB, 3GB, 5GB, 10GB, and 20GB options, taking both price and validity into account. Plans valid for fewer than seven days are still shown in the table for reference, but they are not counted when identifying the cheapest option for a full 7-day trip. Plans with 15- or 30-day validity are included as long as one purchase covers the entire trip.

Unlimited plans were compared using the total price for the same 7-day period. In other words, we looked at what you would actually need to pay to stay connected for the full trip, not simply the lowest price shown on a provider’s website.

Disclosure: HalfSIM is our own eSIM service. We apply the same price and validity criteria to every provider in this comparison and note when another provider offers a lower price.

Cheapest Fixed-Data eSIMs for Korea

If you have a rough idea of how much data you’ll use and don’t mind keeping an eye on your remaining allowance, a fixed-data eSIM can be an inexpensive option. A 1GB plan is best treated as a bare-minimum choice for travelers who rely on Wi-Fi almost everywhere and only use mobile data when necessary for maps or messaging. If you use maps, messaging, search, and translation every day while still making good use of Wi-Fi, 3–5GB is a more practical range for a 7-day trip. If you use social media frequently, upload photos or videos, or simply want more freedom to use mobile data while you’re out, it is worth looking at plans with 10GB or more. 

In this comparison, HalfSIM has the lowest prices at 1GB ($1.75) and 3GB ($4.25). Airalo and Nomad tie for the lowest price at 5GB ($10), while HalfSIM comes out lowest again at 10GB ($11.75) and 20GB ($20.50). If 3GB is enough for your trip, HalfSIM’s $4.25 plan is the cheapest option here; if you need 5GB, Airalo and Nomad are tied at $10. For heavier use around the 10GB mark, HalfSIM’s $11.75 plan has the lowest price. 

7-Day Unlimited eSIM Price Comparison

If you are not sure how much data you’ll use—or expect to rely heavily on maps, public transportation, translation, search, and social media—an Unlimited plan is also worth comparing. This is especially useful if you are already considering a fixed-data plan with around 10GB or more. 

[Get 7 days of Unlimited data for $12.88 →]

HalfSIM has the lowest-priced 7-Day Unlimited plan in this comparison at $12.88. Nomad costs $25, Saily $26.99, Holafly $27.50, and Airalo $29. HalfSIM’s 10GB fixed-data plan is $11.75, so moving up to the 7-Day Unlimited plan costs just $1.13 more. If you are already considering around 10GB, that small price difference makes Unlimited worth a look.

If 3–5GB is enough for your trip, though, a lower-priced fixed-data plan can still cost considerably less.

Is a Cheap Unlimited eSIM Actually Worth It?

Check the FUP Before Choosing “Unlimited”

“Unlimited” does not necessarily mean full-speed data all day. Many Unlimited eSIMs use a Fair Usage Policy (FUP), which slows your connection after you reach a certain amount of high-speed data.

HalfSIM’s Unlimited plans are also subject to an FUP, depending on the plan and local carrier. Some plans include 1GB to 5GB of high-speed data per day before speeds are reduced to 1Mbps.

Airalo’s 7-Day Unlimited plan for South Korea includes 3GB of high-speed data per day before speeds drop to 1Mbps. Nomad reduces speeds to 512kbps once the daily high-speed allowance is used, with the allowance resetting every 24 hours from activation. Saily provides 1GB of full-speed data every 24 hours, after which speeds are reduced to 512Kbps until the next 24-hour period begins. Holafly may also apply the local carrier’s FUP, but it does not publicly specify the exact daily high-speed allowance or reduced speed for its South Korea plan.

When comparing Unlimited eSIMs, check both how much high-speed data you get each day and what happens after you reach the limit—not just the headline price.

Check Hotspot Limits Too

If you plan to connect a laptop or tablet, check the hotspot or tethering rules as well. Two plans can both be labeled Unlimited while allowing very different amounts of data to be shared with other devices.

HalfSIM supports hotspot use within the plan’s data and FUP conditions, while Nomad also supports tethering. Holafly’s South Korea plan allows up to 1GB of hotspot data per day, or up to 7GB in total on a 7-day plan. If you expect to connect multiple devices, it is worth comparing hotspot limits alongside the plan price.

Before You Buy a Cheap Korea eSIM

Even the cheapest eSIM may not be the right choice if it is missing something you need for your trip. HalfSIM, for example, is a data-only eSIM and does not include a Korean phone number. If you need Korean voice calls or SMS, check whether the specific plan you are considering includes a local number.

If you are still choosing between an eSIM, Pocket WiFi, SIM card, or international roaming for Korea, price is only one part of the decision. You may also want to consider whether you need a Korean phone number, plan to connect multiple devices, or want to avoid picking up and returning equipment. For a full comparison, see Korea eSIM vs Pocket WiFi: Best Choice for 2026. Before purchasing an eSIM, also make sure your phone supports eSIM and is carrier-unlocked. For iPhone compatibility and setup instructions, see iPhone eSIM for Korea: How to Install It in 2026.

FAQ: Cheapest eSIM for South Korea

Q. What is the cheapest eSIM for South Korea?

In this comparison, HalfSIM’s 1GB plan has the lowest starting price at $1.75. HalfSIM also has the lowest 3GB price at $4.25. At 5GB, Airalo and Nomad are tied at $10, while HalfSIM has the lowest prices at 10GB ($11.75) and 20GB ($20.50). For a 7-Day Unlimited plan, HalfSIM is also the lowest-priced option in this comparison at $12.88.

Q. Which eSIM is cheapest if I need 3GB or 5GB for Korea?

For a 7-day trip, 3–5GB can be a practical range if you use Wi-Fi alongside maps, messaging, search, and translation. In this comparison, HalfSIM has the lowest-priced 3GB plan at $4.25, while Airalo and Nomad are tied for the lowest 5GB price at $10.

Q. What is the cheapest Unlimited eSIM for a 7-day trip to Korea?

In this comparison, HalfSIM’s 7-Day Unlimited plan is the lowest-priced at $12.88. Nomad costs $25, Saily $26.99, Holafly $27.50, and Airalo $29. However, FUP and hotspot conditions vary by provider, so it is worth checking the usage conditions as well as the price.

Q. How much data do I need for a 7-day trip to Korea?

1GB can work if you rely on Wi-Fi almost everywhere, but it leaves little room for regular mobile use. If you use maps, messaging, search, and translation every day while also using Wi-Fi, 3–5GB is a more practical range. If you frequently use social media, upload photos or videos, or stream content, consider 10GB or an Unlimited plan.

Q. Is the cheapest eSIM always the best value?

Not necessarily. The lowest-priced plan may cost more in the end if the data allowance is too small and you need to buy additional data during your trip. A 1GB plan may have the lowest upfront price, for example, but it may not be enough for heavier users. Estimate how much data you are likely to need first, then compare the cheapest plans within that range.

Which Korea eSIM Is Cheapest for Your Trip?

The cheapest option ultimately depends on how much data you need. HalfSIM has the lowest price at several fixed-data levels in this comparison, as well as for 7-Day Unlimited, while Airalo and Nomad tie for the lowest 5GB price.

Start by estimating how much data you are likely to use over seven days, then compare prices within that range. That is more likely to keep your total trip cost down than simply choosing the plan with the lowest starting price.

*Prices and plan conditions were checked on September 16, 2026 and may change. Check each provider’s official product page before purchase.

sources

1. HalfSIM — Korea eSIM plans
2. Airalo — South Korea eSIM
3. Nomad — Korea Travel eSIM
4. Saily — South Korea eSIM
5. Holafly — South Korea eSIM