Cheapest eSIM for USA from the UK (2026) update

Here's the honest answer

• Cheapest headline price: Revolut ~£1.50/GB. Sounds great. Runs out in half a day.
• Cheapest for a real trip: Sim Local Plan; 18GB 30 days Three UK £20–24. Works out at ~£1.40/GB; less than Revolut, with 15x the data.
• The trap: Buying tiny plans and topping up 10 times costs more in total and ruins your trip. One flat-rate plan beats multiple micro-purchases every time.
• Unlimited option: Sim Local Unlimited Plan ~£38–50 for 7 to 15 days. Best for World Cup multi-city trips or road trippers who don't want to think about data.
• Hidden costs to avoid: Holafly throttles after a daily cap. Some budget providers use secondary networks with patchy rural coverage.

See Sim Local's USA eSIM Prices

Picture this: you've done your research. You found a USA eSIM for £1.50 per gigabyte. Bargain. You land in New York, activate it on the way through passport control, and open Google Maps to find your hotel.

Forty-five minutes later, your 1GB plan is gone. You're standing outside JFK with no data, a dead link to your hotel address, and no idea how much it'll cost to top up again.

You end up flagging down a cab, paying $55 for a ride that would have been $28 in an Uber. You've saved £3 on your eSIM and spent an extra £22 on the taxi.

This is the cheapest eSIM trap. And it catches thousands of British travelers every year.

This guide cuts through the noise. We'll show you exactly what USA eSIM plans cost per gigabyte, which "budget" options have hidden catches, and where Sim Local genuinely sits because, as one independent travel reviewer noted, Sim Local comes out cheaper most of the time when you compare data allowances like for like.

When you search for a cheap eSIM for the USA, you'll see headline prices as low as £1.50 to £2.99. Those numbers are real, but they're almost always for 1 GB over 7 days, the smallest plan each provider offers.

Nobody actually uses 1GB for a US trip. Here's a blunt reality check:

• Google Maps navigating for one hour: 40–50MB
• One Instagram video scroll session (20 mins): 100–200MB
• A single 30-minute WhatsApp video call home: 250–300MB
• One YouTube video (5 mins, HD): 150MB

A typical day out in New York: maps to get around, messaging your group, posting a couple of photos, looking up restaurant reviews; uses 800MB to 1.5GB without trying. A 1GB plan covers roughly half a day of normal use.

So the real question isn't "what's the cheapest 1GB plan?" It's: What's the cheapest plan that will actually cover my trip?

That's the number this guide gives you.

Here's where most comparison articles fail: they list headline prices without showing what you're actually getting.

The metric that matters is cost per gigabyte for a realistic trip-length plan. We've done the maths so you don't have to.

When you look at it this way, the picture changes completely. A £1.50 entry plan costs £1.50 per gigabyte but only buys you 1 GB. Sim Local's Explorer Plan works out at roughly £1.40 per gigabyte and gives you 15GB to use across 30 days, with no throttling, no daily caps, and coverage network across every US city. You can also see the best e-sim plan for US.

Cheap per-GB. Genuinely useful amount of data. No nasty surprises.

Here's a real-world look at what the cheapest option actually costs across different trip types; UK roaming vs a Sim Local eSIM vs a budget entry plan:

Roaming rates estimated at £5/day (varies by carrier). Budget eSIM assumes 2–3 top-up purchases.

The Sim Local Explorer Plan consistently delivers the best combination of low total cost, large data allowance, and zero mid-trip friction.