A good price for travel data is one that beats your own benchmark for the same trip: what your carrier would charge, and what a comparable prepaid plan costs for the same country, days and full-speed data. Build the benchmark before you look at offers, using your carrier's rate and a public price index, then judge each deal against it.
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Key facts
- A price is only good or bad against a benchmark for the same trip.
- Your carrier's roaming rate is the first benchmark: the cost of doing nothing.
- TripoSIM publishes a public price index of its own catalogue, refreshed hourly; it is first-party data, not a market survey.
- Cost per GB and cost per usable day are comparison tools, not verdicts.
On this page
- Short answer
- Why do you need a benchmark before you shop?
- What are the three anchors of a benchmark?
- How do you build the benchmark in ten minutes?
- How should you use cost per GB and cost per day?
- How do you judge an offer against your benchmark?
- Which benchmarks mislead people?
- What does a benchmark look like in practice?
- FAQ
Why do you need a benchmark before you shop?
"Great deal" is a claim about a comparison. Without knowing what you are comparing with, a 40% discount, a $2 starter plan or an "unlimited" banner tells you nothing about whether you are saving money on your trip. A benchmark is the price you would pay anyway for the same trip, built before you look at any offer, so that offers are judged against it rather than against their own advertising.
What are the three anchors of a benchmark?
- Doing nothing. What your own carrier would charge for the trip: billed days times the day price, or the pack price, or zero if the country is included.
- A typical prepaid price for the same country, days and data. A public price index is a quick way to see the range. TripoSIM publishes one for its own catalogue.
- Your usage. How much full-speed data you will really use, in GB, and how many days you need it.
With those three numbers you can say what a good price looks like before anyone tries to sell you something.
How do you build the benchmark in ten minutes?
- Write the trip: countries, billed days, phones
- Look up your carrier's rate for each country
- Estimate full-speed GB for the whole trip
- Note a typical prepaid price for those days and GB
- Your benchmark = the lower of roaming and typical prepaid
Here is a worked example. The roaming price is invented; the "typical prepaid" line is from TripoSIM's public index on the date shown, used only to illustrate the method.
TripoSIM's public price index listed Spain with 18 plans: 1 GB from $1.14, 5 GB from $4.28, 10 GB from $7.66, and unlimited-data plans from $2.07. These are the cheapest plans of each size in TripoSIM's own catalogue that day; check each plan's days before comparing. Prices change, and the live Spain page is authoritative.
- Doing nothing: carrier day pass, 9 billed days at $8 (example)$72.00
- Typical prepaid: a 5 GB plan, from the public index on 7 Nov 2026$4.28
- Benchmark (the lower of the two)$4.28
With that benchmark, an offer of 8 GB for $30 is not a deal for this trip, however large its discount badge. An offer at or below the benchmark for the right days and data is.
How should you use cost per GB and cost per day?
Unit prices are comparison tools, not verdicts:
- Cost per GB = price ÷ full-speed GB. Useful between plans that both fit your trip. Misleading when the cheaper per-GB plan is far bigger than you need.
- Cost per usable day = price ÷ the days you will actually use. A 30-day plan on a 10-day trip costs three times as much per usable day as it says on the box.
- 7-day plan at $6, 7 days used$0.86
- 15-day plan at $9, 7 days used$1.29
- 30-day plan at $14, 7 days used$2.00
Example numbers. Dollars per usable day on a 7-day trip; lower is better.
Our archive guides go deeper on cost per GB and price per usable day.
How do you judge an offer against your benchmark?
- Same countries as the benchmark
Every country on the route listed.
- Same days or more
Validity covers the trip, counted from when it starts.
- Same full-speed data or more
Not "unlimited" without a full-speed figure.
- Final checkout total at or below the benchmark
Including fees and currency conversion.
- Refund terms readable before paying
You know what happens if plans change.
Which benchmarks mislead people?
- The "was" price. A crossed-out price is the seller's own reference, not a market benchmark.
- Last year's trip. Prices and roaming terms change; rebuild before each trip.
- A different country. Prices vary widely between countries; benchmark the one you are visiting.
- The smallest plan. A tiny plan's low price is not a benchmark if you would need to buy it three times.
For coupons and promo codes, read what counts as a real deal; for the full trip comparison, the trip connectivity cost calculator.
What does a benchmark look like in practice?
Here is a benchmark written out for a ten-day trip, with example numbers, so you can see the shape before you build your own:
- Your carrier's day pass, 11 billed days at $10 (example)$110.00
- A public index's median price for a plan of this size (example)$18.00
- The same plan per usable day, 10 days (example)$1.80
- The price to beat$18.00
With that card in hand, an offer that says "70% off" is easy to judge: what is its checkout price for a plan that covers ten days and enough data, and is it below the price to beat? If it is, and the terms pass the checks in the plan terms glossary, it is a good price for you. If it is not, the discount is a story, not a saving.
The card also protects you against the opposite mistake: refusing a fair price because a cheaper plan exists for fewer days. A plan that is cheaper but too short is not a better deal; it is a different trip.
Frequently asked questions
Is cost per GB the best way to compare travel data?
It is useful but incomplete. A cheap price per GB on a plan far bigger than you need is still money spent on data you will not use. Compare cost per GB only between plans that fit your trip's days and data.
Where can I find typical travel eSIM prices?
Some sellers publish price indexes of their own catalogues. TripoSIM, for example, publishes one for 198 countries. Treat any seller's index as first-party data: useful for a benchmark, not an independent market survey.
Is a discount percentage a good guide to value?
Not on its own. A percentage needs a reference price for the same plan, on the same date, in the same currency. Compare the final checkout total with your benchmark instead.
How often should I update my benchmark?
Before each trip. Roaming terms and plan prices change, and a benchmark from last year may be wrong today.
Related reads
Sources and notes
- TripoSIM Travel eSIM Price Index (first-party, refreshed hourly)
- TripoSIM FAQ: hidden fees
- European Commission: roaming questions and answers
Prices in this article are labelled examples for the arithmetic, not offers, unless a line says it is a dated TripoSIM price. TripoSIM facts are quoted from its public pages on the date shown and can change; the TripoSIM checkout and policy pages are authoritative.