How Much Data Do You Actually Need When Travelling Abroad? A 2026 Cost Breakdown
Trying to guess your data needs before a trip abroad? Here's a practical breakdown based on real usage patterns, plus what it actually costs to cover that data with your UK carrier's roaming versus a Ukesim.io eSIM.
How Much Data You'll Actually Use
Your data use abroad depends mostly on three things: how much you navigate with maps, how much you stream, and how much time you spend on social media or video calls back home. Here's what that looks like for three common traveller types:
| Trip length | Light user | Moderate user | Heavy user |
|---|---|---|---|
| 3 days | 1 GB | 3 GB | 5.5 GB |
| 7 days | 2.5 GB | 7 GB | 12 GB |
| 14 days | 5 GB | 14 GB | 24.5 GB |
| 30 days | 10 GB | 30 GB | 52 GB |
Light user: occasional maps checks, messaging, light browsing. Moderate user: regular navigation, about an hour of streaming, two hours of social media, and video calls home. Heavy user: frequent navigation, multiple hours of streaming and social media daily, regular video calls.
These figures include a 15% buffer for network overhead, so it's better to have a little extra than run out mid-trip.
What That Costs: UK Roaming vs. eSIM
UK carrier roaming costs vary a lot by destination. Within the EU, EE, O2, and Three still offer some free or low-cost roaming, roughly £2 to £4 a day. Outside Europe, the same trip gets a lot more expensive; the USA is a good example:
| Trip length | UK carrier roaming (USA, typical) | Ukesim.io eSIM | You save |
|---|---|---|---|
| 3 days | ~$24 | ~$5 | ~78% |
| 7 days | ~$56 | ~$12 | ~78% |
| 14 days | ~$113 | ~$24 | ~78% |
| 30 days | ~$242 | ~$52 | ~78% |
The savings percentage holds steady regardless of trip length, because roaming charges by the day whether you use 200MB or 2GB, while an eSIM only charges for the data you actually need.
Bottom Line
For most UK travellers heading outside Europe, a moderate data plan of 5 to 10GB covers a typical week comfortably, and switching from carrier roaming to an eSIM cuts the cost by roughly three-quarters or more, especially outside the EU where UK carrier roaming gets expensive fast.
Browse eSIM plans for your destination on Ukesim.io and pick the size that matches your trip.
Estimates use typical 2026 data-usage benchmarks and UK carrier roaming rates. Individual carrier pricing varies, so check yours before you travel.