Per app · per day · three real trips
How much data do you need in Korea?
Korea runs on apps that do not exist anywhere else, and most of them are lighter than you fear. The one that is not lighter is the one everyone underestimates.
How much data you need in Korea by trip length hotel wifi assumed
| Trip style | 5 days | 10 days | 14 days | 30 days |
|---|---|---|---|---|
| Naver Map, KakaoTalk, Papago, Kakao T | 2GB | 3.5GB | 5GB | 10GB |
| Plus photos, Instagram or TikTok, some YouTube | 8GB | 15GB | 20GB | 45GB |
| Plus laptop hotspot and work calls | 20GB | 40GB | 55GB | unlimited |
| Plans that fit | Airalo 10GB / 7d $18.00 | Airalo 20GB / 15d $29.00 | Yesim 20GB / 30d $27.96 | Airalo 50GB / 30d $49.00 |
Rows are cumulative: the middle row includes everything in the top one. The estimates are deliberately generous, about 350MB a day for the top row and 1.5GB a day for the middle one, because a plan that dies at 22:00 outside Hongdae station costs more in stress than the few dollars a smaller one saved. Assumes wifi at your accommodation most nights, which in Korea is a safe assumption. Prices checked September 7, 2026.
What each Korean app costs in data per hour, published estimates
These are published estimates from a September 2026 usage guide, not our own measurements. We will replace them with measured figures when we have them and say so.
| What you are doing | Roughly | Notes |
|---|---|---|
| Naver Map, walking and transit | 5 to 12MB / hour | Light, but it re-downloads map tiles more readily than Google Maps does. Save your offline areas before you fly. |
| KakaoMap | 5 to 10MB / hour | Slightly lighter than Naver. Most visitors end up using both. |
| Kakao T, calling a taxi | a few MB per ride | Negligible. The data cost is the map behind it, not the booking. |
| KakaoTalk, text | ≈1MB / 100 messages | Nothing. Photo sends and voice notes are the cost. |
| KakaoTalk, voice call | 3 to 5MB / minute | A twenty-minute call home is about 100MB. Video roughly triples it. |
| Papago, camera translation | 20 to 30MB / hour | The Korea-specific line. Menus, signs, ingredient labels, subway notices. Lighter than Google Translate's camera, still the app you will open most. |
| Instagram, scrolling and stories | 100 to 150MB / hour | The item that separates a 5GB trip from a 20GB one. |
| TikTok | 200 to 300MB / hour | Twice Instagram. An hour a day on the subway is 3 to 4GB over two weeks by itself. |
| YouTube or Netflix | 250 to 700MB / hour | Depends entirely on resolution. On the KTX the phone will pick the top of that range if you let it. |
| Photo backup over cellular | 3 to 5MB per photo | A day at Gyeongbokgung is 200 photos. Turn it off, or accept a gigabyte a day. |
| Tethering a laptop, working day | 2 to 3GB / day | Video calls, cloud documents, a browser full of tabs. This is the unlimited case. |
All figures are estimates at the quality settings phones default to on cellular. Yours will differ, mostly with how much video you watch.
Three things that change the data budget in Korea two down, one up
Public wifi is real here. Seoul's subway, buses, most cafes and every convenience store have wifi that works without an email registration, and the city has been adding free access points for a decade. This is the opposite of most of Asia. It does not replace a data plan, because you cannot call a Kakao T taxi from a wifi hotspot you have just walked away from, but it shaves a real chunk off the budget if you let the phone join it.
The apps are lighter than their reputation. Naver Map and Papago together run under 40MB an hour of active use. A first-timer who does nothing but navigate, translate and message will struggle to spend 500MB in a day. The 2025 guides that say "you need at least 1GB a day in Korea" are budgeting for video.
The KTX pushes the other way. Seoul to Busan is two and a half hours and the phone will stream at the highest quality the signal allows. Korea's regulator measured rail 5G at 393 Mbps on average in its 2025 evaluation, which is plenty for Netflix at full resolution, which is about 700MB an hour. Two rail days on a trip can add 3GB. Download the episode on hotel wifi and it adds nothing.
Three Korea trips with real numbers attached pick the one that sounds like you
Six days across Hongdae, Gyeongbokgung, Bukchon and a day trip to Suwon. Naver Map all day, Papago on every menu, KakaoTalk with the friend who moved here, photos backing up on hotel wifi only, no scrolling on the subway because the subway has wifi. About 500 to 600MB a day. Buy 5GB: Airalo Jjang 5GB for $10.00 over 7 days, on SK Telecom, the cheapest 5GB we can link on September 7, 2026. Con: Airalo's own site may quote you in Canadian dollars; the checkout is USD.
Everything above, plus an hour of Instagram a day, stories going up from Haedong Yonggungsa as you shoot them, a TikTok habit on the KTX, one episode a night when the hostel wifi is slow, and a rental car on Jeju with Naver Map navigating for six hours a day. About 1.3GB a day. Buy 20GB: Yesim 20GB for $27.96 over 30 days, the cheapest 20GB on this site, or Airalo 20GB for $29.00 over 15 days if you want the network in writing. Yesim con: it does not publish its Korean network, and its Trustpilot score sits on the smallest review base here. Install before you fly to Jeju; there are no carrier counters at the airport since June 2026.
A laptop tethered four days a week from a Seongsu coworking desk, two video calls a day to a US time zone, cloud documents, plus a normal traveler's evenings and weekends. Two to three gigabytes a day before you touch your own phone. No bucket we can link goes above 50GB. Buy unlimited: Saily's 30 days for $71.99 with a 5GB daily cap, the biggest published cap we can sell. Con: Saily does not say what speed you get after 5GB. If you will register a passport after landing, SKT via krsim sells 30 days with no cap for $42.40, unlinked; details here.
Most visitors are the first two. The mistake runs both ways: 3GB for a trip that needs 15, or an unlimited plan for a trip that needs 5. Airalo's Jjang ladder covers both of those travelers on the one Korean network anyone we link will name.
See Airalo Jjang plans Compare every providerWhich Korea eSIM to buy at each data size cheapest we can link, then the one we cannot
| Size | Cheapest linkable | Runner-up | Unlinked, for honesty |
|---|---|---|---|
| 1GB | GigSky $2.99 / 7 days | Yesim $3.00 / 30 days, a month for one cent more | Ubigi $3.00 / 7 days |
| 3GB | GigSky $8.49 / 15 days | Saily $8.99 / 30 days | Ubigi $7.00 / 7 days |
| 5GB | Airalo $10.00 / 7 days | GigSky $10.29 / 30 days | Nomad $10.00 / 30 days |
| 10GB | GigSky $17.79 / 30 days | Saily $18.99 / 30 days, Airalo $19.00 on SK Telecom | Ubigi $14.00 / 30 days, $3.79 cheaper than anything we sell |
| 20GB | Yesim $27.96 / 30 days | Airalo $29.00 / 15 days | Ubigi 25GB $25.00 / 30 days |
| 30GB and up | Yesim 30GB $35.04 / 30 days | Airalo 50GB $49.00 / 30 days | Nomad 50GB $39.00 / 30 days |
Match validity to the trip as well as size: GigSky's 3GB lasts fifteen days, Airalo's 5GB seven, Yesim's 20GB thirty, and those are different products. GigSky pays us the highest commission of any brand here (20 per cent) and Airalo the lowest (12 per cent); the order above is price, not payout. Prices checked September 7, 2026.
Five ways to use half as much data in Korea none of them involve being careful
- Save offline areas in Naver Map for Seoul, Busan and Jeju before you fly. Naver re-fetches tiles more eagerly than Google Maps, and a rental-car day on Jeju with live tiles is a surprising line on the bill.
- Turn off cellular photo backup. iCloud and Google Photos will push a day of Gyeongbokgung over SK Telecom at 5MB a photo. Settings, Photos, wifi only. The single biggest saving on this list.
- Download Papago's Korean offline pack. Text translation then costs nothing; the camera still needs a connection but uses less of it.
- Let the phone join subway and convenience-store wifi. Seoul's is genuinely usable and needs no registration. This is the one country where the advice is to trust the public wifi.
- Download the KTX episode on hotel wifi. Two rail days at 700MB an hour is 3GB. Everything on this list except video is rounding error.
Korea data questions short answers
Is 5GB enough for a week in Korea?
For maps, KakaoTalk, Papago, photos backed up on wifi and light social use, yes, with room to spare: that pattern runs 500 to 700MB a day. If you scroll Instagram or TikTok on the subway for an hour or more a day, take 10GB. Airalo's 5GB is $10.00 for seven days, GigSky's 10GB is $17.79 for thirty. Checked September 7, 2026.
Is 10GB enough for two weeks in Korea?
For a careful traveler, yes. For a normal one with a daily hour of social video and a couple of KTX journeys, it is tight: that pattern is about 1.3GB a day, or 18GB over two weeks. Twenty gigabytes is $27.96 from Yesim over thirty days or $29.00 from Airalo over fifteen, and the extra ten dollars buys you the KTX.
How much data does Naver Map use?
A published September 2026 estimate puts Naver Map at 5 to 12MB an hour of active navigation, slightly more than KakaoMap at 5 to 10MB. Over a full sightseeing day that is under 100MB. It climbs on a Jeju driving day because Naver re-downloads tiles as you move; saving the island offline before you fly fixes it.
Does Korea have free wifi for tourists?
Yes, and unlike most of Asia it works. Seoul's subway cars and stations, city buses, most cafes and every convenience store chain offer wifi without an email registration. It does not replace a data plan, because you need a connection the moment you step onto the street to call a Kakao T, but it lets a light user get by on 3 to 5GB a week.
What uses the most data in Korea?
Video, as everywhere: TikTok at 200 to 300MB an hour, YouTube and Netflix at up to 700MB. The Korea-specific items are all small: Papago's camera at 20 to 30MB an hour, Naver Map at 5 to 12MB. The trap is the KTX, where the signal is good enough to stream at full quality for two and a half hours and the phone will do exactly that.
A week in Seoul? 5GB for $10.00
The cheapest 5GB we can link, valid seven days, on SK Telecom, the one Korean network any brand we sell will put in writing. Two weeks with social video: buy 20GB instead. A month of tethered work: read the unlimited page first.
See Airalo Jjang 5GBSources & freshness: Per-app figures are published estimates from a September 2026 travel-data guide, not our own measurements, and we say so wherever they appear. Plan prices from esimdb and each brand's Korea page on September 7, 2026, in USD, before promo codes. Rail speed from the Ministry of Science and ICT 2025 quality evaluation. The Jeju airport counter closure is from a May 2026 Korean news report of SKT's exit at the end of June 2026. How we test.