How Much Data Do You Need for London? A 2026 Cost Breakdown
Trying to guess your data needs before a London trip? Here's a practical breakdown based on real usage patterns, plus what it actually costs to cover that data with carrier roaming versus a Londonesim.io eSIM.
How Much Data You'll Actually Use
Your data use in London depends mostly on three things: how much you navigate with Google 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 Google Maps navigation on the Tube and on foot, 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: Roaming vs. eSIM
Here's the real cost difference for a moderate-use traveller, based on typical 2026 international roaming rates (non-EU carriers charge £3 to £10 per day for UK roaming) versus Londonesim.io's UK eSIM pricing:
| Trip length | Carrier roaming (typical) | Londonesim.io eSIM | You save |
|---|---|---|---|
| 3 days | ~$26 | ~$6 | ~77% |
| 7 days | ~$61 | ~$14 | ~77% |
| 14 days | ~$123 | ~$29 | ~77% |
| 30 days | ~$263 | ~$62 | ~77% |
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 travellers heading to London, 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.
Browse UK eSIM plans on Londonesim.io and pick the size that matches your trip.
Estimates use typical 2026 data-usage benchmarks and international roaming rates. Individual carrier pricing varies, so check your provider before you travel.