Buying a South Korea eSIM on Airalo costs more than it needs to. We put both sites' published prices side by side, plan for plan.
On 7 matching plans altesim.com came out cheaper than Airalo, by 66% to 76%.
How we compared
Both columns are the prices each site published on 11 September 2026, listed in US dollars. We used each site's actual selling price, not a struck-through list price.
Every comparison uses altesim.com's full price, ignoring the 10% site-wide discount it runs one day in three — the strictest reading against ourselves.
A "matching plan" means the same number of days and the same data allowance, with per-day plans compared only against per-day plans.
A detailed comparison: How altesim.com and Airalo differ
| Plan | altesim.com | Airalo | You save |
|---|---|---|---|
| 7 days · 10GB total | US$5.72 | US$18 | 68% |
| 15 days · 10GB total | US$6.16 | US$18.5 | 67% |
| 30 days · 10GB total | US$6.38 | US$19 | 66% |
| 7 days · 5GB total | US$3.4 | US$10 | 66% |
| 15 days · 5GB total | US$3.61 | US$10.5 | 66% |
| 30 days · 5GB total | US$3.71 | US$11 | 66% |
| 7 days · 3GB total | US$2.2 | US$9 | 76% |
When comparing the prices of South Korea eSIMs, we found that altesim.com's 7 South Korea eSIM plans were all cheaper than Airalo's, with savings ranging from 66% to 76%. The most striking example is the "7 days, 3GB total" plan, which altesim.com sells for US$2.2, while Airalo charges US$9, a saving of 76%. This difference is quite significant.
Secondly, the longer the duration, the smaller the savings. For example, for the "10GB total" plan, altesim.com charges US$5.72 for 7 days, while Airalo charges US$18, a saving of 68%. However, for 30 days, altesim.com charges US$6.38, and Airalo charges US$19, reducing the savings to 66%. This pattern is the same for the "5GB total" plan, with 66% savings for both 7 days and 30 days.
Thirdly, after reviewing the table, if you're traveling to South Korea and won't be spending much time in hotels or places with Wi-Fi, then the "10GB total" or "5GB total" plans would be more suitable for you. These plans allow you to use data worry-free during your trip without the concern of running out.
How to use a data cap plan without running out midway
With a data cap eSIM, you don't need to count your data usage daily. This way, you can use more data on days when you need it without worrying about exceeding a daily limit. During a trip to South Korea, the most data-consuming activities include using navigation, uploading photos, watching videos, or live streaming. These activities can quickly consume your data.
To estimate how many GB you need, you can base your decision on the length of your trip and the types of activities you plan to do. For example, if you're mainly using maps and communication apps, then 1GB per day should be sufficient. However, if you're constantly using navigation, uploading photos, or watching videos, you might need 5GB to 10GB. These estimates can help you choose the most suitable plan.
The variety of options on altesim.com's South Korea page
altesim.com's South Korea page offers 188 plans, covering needs from 1 day to 365 days. You can choose between data cap or daily plans. Data cap plans are suitable for those who won't be using the network constantly, while daily plans are ideal for those who need a stable network connection every day. Additionally, altesim.com has some plans that cover multiple countries, including South Korea, which is convenient if you plan to travel to multiple countries.
altesim.com has a total of 2,303 plans covering 84 destinations, so no matter where you travel, you can find a suitable plan here.
How much data do you actually need in South Korea? Three itineraries to consider
Itinerary A: If you're traveling to South Korea and will mainly be using Wi-Fi at your accommodation, only using maps and communication apps, then "3GB total" should be enough. This plan is suitable for short trips or those who won't be using the network frequently.
Itinerary B: If you're constantly using navigation, uploading photos, and watching some videos, then "5GB total" would be more appropriate. This plan can meet your basic needs without using up data too quickly.
Itinerary C: If you plan to use your phone as a hotspot for others or watch videos or live streams frequently, then "10GB total" would be the best choice. This plan provides you with plenty of data, ensuring a hassle-free trip.
The advantages of altesim.com
Firstly, altesim.com offers an instant purchase and use service. The QR code is displayed immediately on the order page and also sent to your email, allowing you to install it by simply scanning with your phone's camera. Secondly, you can buy up to 10 eSIMs in a single order, making it convenient to handle all eSIMs for your travel companions at once. Thirdly, altesim.com has a 10% discount every 3 days, allowing you to save more money by purchasing during these times.
Three things to do before buying
Firstly, check if your device supports eSIM. Recent iPhones, Samsung Galaxy S series, and Google Pixel phones do, but older models and some mainland Chinese versions need to be checked. Secondly, look if it's a discount day; if so, you can save an additional 10%. Thirdly, visit the destination page to check the current price, as prices on different platforms often change, ensuring you get the best deal.
Prices are as published on 11 September 2026 and can change at any time; check the page on the day you buy.