Short answer: Yes. In our catalog a 10 GB travel eSIM costs a median 21% less per GB than a 5 GB plan for the same country, and 20 GB is cheaper again. But the cheapest plan to buy is the smallest one that covers your trip. For a typical week, buy the cheapest 10 GB, 30-day plan.
| Step up in plan size | Destinations compared | Price per GB falls in | Median saving per GB | Median total price | Median cost of each extra GB |
|---|---|---|---|---|---|
| 3 GB to 5 GB | 49 | 48 | 13% | 1.45 times | $2.25 |
| 5 GB to 10 GB | 55 | 54 | 21% | 1.58 times | $1.60 |
| 10 GB to 20 GB | 47 | 45 | 16% | 1.68 times | $1.30 |
| 20 GB to 50 GB | 17 | 16 | 19% | 2.03 times | $0.67 |
Prices checked on 4 October 2026. Each row compares the cheapest single-country, 30-day plan at the two sizes inside the same destination. To pick a size, our trip data calculator puts a moderate week at 4–7 GB, with light and heavy ranges beside it.
This guide looks at one question inside each destination: what happens to the price as the plan gets bigger. Which country is cheapest is a different question, and our ranking of the cheapest countries for mobile data by price per GB answers it. You can check any destination in the travel eSIM catalog. Plan details change, so treat the live listing on each product page as the source of truth before you buy.
How did we measure price per GB by plan size?
We started from the 943 plans you can buy new in our catalog on 4 October 2026, after removing top-up add-ons that only work on an eSIM you already hold. From those we removed 43 unlimited plans, which have no gigabyte figure to divide by, 4 replacement services, and one plan whose data field holds a placeholder instead of a real allowance. That leaves 895 plans with a fixed amount of data: 595 for a single country and 300 covering several.
The 595 single-country plans cover 82 destinations. A plan that also works in a territory of the same country (Puerto Rico with the USA, San Marino and Vatican City with Italy) counts as single-country, the same rule our price map uses.
Validity changes the price too, so we held it constant. Of the 595 single-country plans, 411 run for 30 days, which makes 30 days the only validity with enough plans at every size to compare. For each destination and each size we took the cheapest 30-day plan, whichever provider sells it. Then we compared sizes inside the same destination. That is the comparison a buyer makes: same country, same 30 days, more or less data.
One limit on these figures. The smallest size with 30-day plans is 3 GB. We list no single-country 1 GB plan with 30 days of validity, so the curve below starts at 3 GB. The 1 GB plans we do sell are short: 57 of them run for 7 days, across 45 destinations, at a median price of $5.99.
Does price per GB fall as the plan gets bigger?
Yes, at almost every step and in almost every destination. Going from 5 GB to 10 GB, the price per GB falls in 54 of the 55 destinations that have both sizes. From 10 GB to 20 GB it falls in 45 of 47. From 3 GB to 10 GB it falls in all 45 destinations that have both, by a median of 34%.
The fairest way to see the whole curve is to follow one fixed group of destinations. Fifteen of them have a 30-day plan at 5, 10, 20 and 50 GB. Their median cheapest prices:
| Plan size | Median cheapest price | Median price per GB |
|---|---|---|
| 5 GB | $7.49 | $1.50 |
| 10 GB | $12.99 | $1.30 |
| 20 GB | $19.99 | $1.00 |
| 50 GB | $37.99 | $0.76 |
Ten times the data costs about five times the money. Per GB, the 50 GB plan is half the price of the 5 GB plan.
The last column of the first table says the same thing from the buyer’s side. Moving from 5 GB to 10 GB, each extra gigabyte costs a median $1.60. From 10 GB to 20 GB it costs $1.30. From 20 GB to 50 GB it costs $0.67. Data gets cheaper the more of it you buy, and the discount grows fastest at the top of the range, where most travellers never get.
What does each plan size cost in popular destinations?
These are the cheapest single-country, 30-day plans at each size, with the price per GB in brackets.
| Destination | 5 GB | 10 GB | 20 GB | 50 GB |
|---|---|---|---|---|
| Japan | $7.49 ($1.50) | $9.99 ($1.00) | $17.99 ($0.90) | $37.99 ($0.76) |
| USA | $7.99 ($1.60) | $12.99 ($1.30) | $21.99 ($1.10) | $50.99 ($1.02) |
| United Kingdom | $11.99 ($2.40) | $16.99 ($1.70) | $26.99 ($1.35) | $40.99 ($0.82) |
| France | $7.99 ($1.60) | $10.99 ($1.10) | $17.99 ($0.90) | none listed |
| Thailand | $6.49 ($1.30) | $9.99 ($1.00) | $17.99 ($0.90) | none listed |
| South Korea | $6.99 ($1.40) | $10.99 ($1.10) | $14.99 ($0.75) | $27.99 ($0.56) |
| Australia | $6.99 ($1.40) | $9.99 ($1.00) | $17.99 ($0.90) | $37.99 ($0.76) |
| India | $13.99 ($2.80) | $18.99 ($1.90) | $31.99 ($1.60) | none listed |
| Morocco | $11.99 ($2.40) | $18.99 ($1.90) | $31.99 ($1.60) | $62.99 ($1.26) |
| Turkey | $5.49 ($1.10) | $12.99 ($1.30) | $19.99 ($1.00) | $36.99 ($0.74) |
| Mexico | $31.99 ($6.40) | $46.99 ($4.70) | $43.99 ($2.20) | none listed |
Prices checked on 4 October 2026.
Japan shows the pattern cleanly. The step from 5 GB to 10 GB costs $2.50 for five more gigabytes. The step from 10 GB to 20 GB costs $8.00 for ten more. You can see every size on the Japan eSIM plans page.
Turkey and Mexico are the odd rows, and they lead to the next section.
Where does the rule break?
In a handful of places, because the cheapest plan at each size often comes from a different provider.
In Turkey, the cheapest 5 GB plan is $5.49, or $1.10 per GB. The cheapest 10 GB plan is $12.99, or $1.30 per GB. Two 5 GB plans would cost less than one 10 GB plan. It is the only destination of 55 where the step from 5 GB to 10 GB raises the price per GB.
In Mexico, the cheapest 20 GB plan ($43.99) costs less in total than the cheapest 10 GB plan ($46.99). Nobody should buy the 10 GB plan there.
At the small end the same thing happens more often. In Japan, Singapore, Australia and China, the cheapest 30-day 5 GB plan costs less than the cheapest 30-day 3 GB plan. In Japan that is $7.49 for 5 GB against $9.49 for 3 GB. In Indonesia the two sizes cost the same, $7.49.
The step from 20 GB to 30 GB is the least reliable one. Of the 15 destinations with both sizes, the price per GB rises in 4: Israel, Turkey, Japan and China. The rises are small, a few cents per GB, but they mean 30 GB is not automatically a better deal than 20 GB.
Counting whole ladders, 43 destinations have 30-day plans at four or more sizes. In 34 of them the price per GB never rises from one size to the next. In 9 it bounces at least once.
Inside one provider’s own price list the curve is far more orderly. We found 91 ladders where the same provider sells three or more sizes for the same destination and the same validity. The price per GB never rises in 86 of them, and the total price rises with every step in 90. The surprises come from comparing across providers, and that is exactly what a comparison catalog lets you do.
Why is a smaller plan sometimes dearer than a bigger one?
Because different providers price the same destination very differently, and they all sit in the same list.
We checked every single-country plan against every other plan for the same destination. A plan is beaten when another plan for that destination gives at least as much data, at least as many days, for the same price or less, and is better on at least one of the three. By that test, 161 of the 595 plans are beaten, in 31 of the 82 destinations.
The sharper group is the 71 plans, in 21 destinations, where a plan with more data and no fewer days costs the same or less. In 70 of those 71 cases the better plan comes from a different provider. Some examples from today’s catalog:
- Japan: a 10 GB, 30-day plan at $17.99 sits next to a 20 GB, 30-day plan at $17.99.
- USA: a 5 GB, 30-day plan at $23.99 sits next to a 20 GB, 30-day plan at $21.99.
- Morocco: a 3 GB, 30-day plan at $18.99 sits next to a 10 GB, 30-day plan at $18.99.
- Indonesia: a 5 GB, 30-day plan at $9.99 sits next to a 10 GB, 30-day plan at $9.99.
The destinations with the most beaten plans are the ones with the most providers: 20 of 33 plans for the USA, 15 of 24 for Saudi Arabia and 12 of 23 for Japan.
Our test looks at three things only: data, days and price. Plans also differ in whether they list 5G, whether they allow hotspot, whether they can be topped up and which country your traffic exits from. A plan that loses on data, days and price can still be the right one if you need something the cheaper plan lacks. If you do not, look at the plans one size up and one size down before you pay.
Is the lowest price per GB the cheapest plan to buy?
No. The plan with the lowest price per GB is nearly always the biggest plan on the page, and you pay for all of it whether you use it or not.
In 76 of the 82 destinations, the lowest price per GB belongs to the largest plan we list there. Those plans have a median size of 20 GB and a median price of $37.49. In 20 destinations the lowest price per GB is on a plan of 50 GB or more.
What you pay per gigabyte you use is the number that matters. We took the top of each range in our trip data calculator for a one-week trip, found the cheapest plan that covers it for at least 7 days, and compared it with the plan that has the lowest price per GB.
| Data you use in a week | Destinations with a plan | Cheapest plan that covers it (median) | Lowest per-GB plan (median) | Median extra you pay |
|---|---|---|---|---|
| 3 GB (light) | 79 | $10.99 | $37.99 | $24.00 |
| 7 GB (moderate) | 67 | $18.99 | $39.99 | $16.00 |
| 15 GB (heavy) | 56 | $29.49 | $40.49 | $1.50 |
Prices checked on 4 October 2026.
For a moderate week in Japan, the cheapest plan that covers 7 GB is the 10 GB plan at $9.99. The plan with the lowest price per GB is 50 GB at $37.99. Chasing the better rate costs $28.00 more for data you will not use. In the USA the gap is $77.00.
The heavy row tells the opposite story. If you use 15 GB in a week, the cheapest plan that covers you and the lowest per-GB plan are the same plan in 27 of 56 destinations, and the median gap is $1.50. Price per GB is a useful guide for heavy users and a misleading one for everyone else.
When is the bigger plan worth it?
When the step up is small and you are close to the limit of the smaller plan.
A few destinations make the bigger plan an easy choice. In Thailand, the cheapest plan that covers a moderate week is 10 GB for 30 days at $9.99, and there is a 50 GB plan valid for 10 days at $12.99. For a trip of 10 days or less, $3.00 buys five times the data. In South Korea, 10 GB for 30 days is $10.99 and 20 GB for 30 days is $14.99, so $4.00 doubles the data.
A working rule from the numbers above:
- Under 10 GB, size up freely. The step from 5 GB to 10 GB is the best-priced one for most trips, at a median $1.60 per extra GB, and in some destinations the larger plan costs the same or less.
- From 10 GB to 20 GB, size up if you tether or stream. The total price goes up by a median 1.68 times. That is worth paying if a laptop will share the connection, and wasted if your phone is the only device and you are on hotel Wi-Fi at night.
- Above 20 GB, only buy what you will use. The per-GB rate looks best here, but a 50 GB plan costs about twice a 20 GB plan.
If you guess low, you are not stuck. Many plans can be topped up on the same eSIM, and our guide to which travel eSIMs can be topped up by destination shows where. If you want no ceiling at all, read how unlimited travel eSIMs handle fair use, throttling and hotspot first, because unlimited rarely means full speed all day.
Do regional packs follow the same curve?
Yes, from a higher starting point. Across the 30-day plans that cover more than one country, the median price per GB is $4.33 at 3 GB, $3.60 at 5 GB, $2.75 at 10 GB and $1.60 at 20 GB.
Europe is the clearest example, because Spain, Germany and several other countries there have no single-country plan with us. Take Spain. The cheapest 30-day plan that covers it at each size is a Europe pack:
| Pack size | Cheapest 30-day plan covering Spain | Price per GB |
|---|---|---|
| 3 GB | $5.49 | $1.83 |
| 5 GB | $8.49 | $1.70 |
| 10 GB | $13.99 | $1.40 |
| 20 GB | $22.99 | $1.15 |
Prices checked on 4 October 2026. All four packs cover 33 or 34 countries.
The curve is flatter at the small end than for a single country. Going from 3 GB to 5 GB saves 7% per GB here, against a median 13% on single-country plans. The larger steps look the same as before. Whether a pack or a single-country plan is the better buy for your route is a separate calculation, and our guide to the break-even between regional and single-country eSIMs works through it.
FAQ
Is a bigger eSIM plan cheaper per GB?
Yes, in almost every destination. In our catalog a 10 GB plan costs a median 21% less per GB than a 5 GB plan for the same country and the same 30 days, and the price per GB fell in 54 of 55 destinations.
What is the cheapest eSIM data plan?
The smallest plan that covers your trip. The lowest price per GB is nearly always on the biggest plan, which costs a median $37.49. For a moderate week of 4–7 GB, the cheapest plan that covers it costs a median $18.99.
Is 20 GB worth it over 10 GB?
Only if you will use more than 10 GB. The 20 GB plan costs a median 1.68 times the 10 GB plan, or $1.30 for each extra gigabyte. It pays off for tethering a laptop or streaming video every day.
Why does a smaller eSIM plan sometimes cost more than a bigger one?
Because the two plans come from different providers. In 71 cases in our catalog, a plan with more data and no fewer days costs the same or less than a smaller one for the same destination, and 70 of those pairs cross providers.
Do regional eSIM packs get cheaper per GB as they get bigger?
Yes. Across our 30-day packs covering more than one country, the median price per GB falls from $4.33 at 3 GB to $2.75 at 10 GB and $1.60 at 20 GB.
Conclusion: pick the size first, then the cheapest plan at that size
A bigger travel eSIM does cost less per gigabyte, and the discount is real at every step from 3 GB to 50 GB. It is also the wrong number to shop by unless you are a heavy user. Work out how much data the trip needs, find the cheapest plan at that size, then look one size up. If the next size costs a dollar or two more, take it. If it costs ten, keep your money.
Before you buy, confirm
- You estimated your data for the trip; a moderate week is 4–7 GB.
- You compared the cheapest plan at your size with the next size up for the same destination.
- You checked that no bigger plan with the same validity costs the same or less.
- The validity covers every day of the trip.
- The plan allows hotspot or top-up if you expect to need either.
Soft next step
Affordable travel eSIM, refund if no code in 1 hour. Compare every size for your destination in the travel eSIM catalog, which lists the cheapest plans first. Plan details change, so treat the live listing on each product page as the source of truth before you buy.