School holidays set travel prices more reliably than weather does

Demand is scheduled, not chosen

It is tempting to assume that travel demand follows good weather, and it mostly does not. Demand follows the weeks in which large numbers of people are simultaneously permitted to be away, and that permission is granted by school terms, statutory holidays and workplace shutdowns.

The clearest evidence is the sharpness of the transitions. Prices do not drift downward as autumn approaches; they fall in a step, on a specific weekend, while the weather on either side of that weekend is indistinguishable.

Anyone not bound to those calendars is therefore holding a substantial advantage, and it is worth being explicit about what that advantage is: the same place, in the same conditions, for a materially different price and with fewer people in it.

Weather still matters, of course, and in some destinations it dominates because the season is genuinely short or a monsoon or a freeze makes part of the year impractical. But within the range of weeks that are plausibly pleasant, the calendar explains far more of the price than the forecast does.

The calendars are staggered, and the stagger is exploitable

School holidays do not fall on the same dates across countries, and in several countries they are deliberately staggered between regions to spread pressure on transport and resorts. The result is a patchwork in which the peak weeks for one source market are ordinary weeks for another.

That matters when the destination draws heavily from a particular country. A coast whose visitors come predominantly from one or two markets will follow those markets calendars rather than any general pattern, and a week that is quiet in one resort can be the busiest of the year twenty minutes down the road.

Working out where a destination visitors come from is therefore a practical planning step rather than trivia. It is usually obvious once you look at which airports have direct flights and which languages the menus are printed in.

Public holidays and the days bridging them

Single-day public holidays produce demand out of proportion to their length, because a holiday falling on a Tuesday or a Thursday invites a bridging day and turns into a four-day weekend. In countries where this is customary, those weekends behave like miniature peak seasons.

They also move. Holidays tied to the lunar calendar or to Easter shift by weeks between years, which means the busy period in a given destination is not fixed to a date and last year experience can be misleading.

The effect is strongest where the bridging custom is well established, because then the extended weekend is not a choice made by a few people but a near-universal one, and transport out of the major cities on the preceding evening becomes the busiest few hours of the month.

Domestic holidays are the ones visitors most often miss entirely. A national day, a regional festival or a religious observance can fill every hotel in a city with people from the same country, and nothing in an international booking site will explain why availability has vanished.

Supply cannot move, so price does the work

In the short term the number of hotel rooms, aircraft seats and ferry berths is fixed. When demand concentrates into particular weeks, the only mechanism available to match the two is price, which is why peak pricing is steep rather than gentle.

Operators do add capacity for a season, and that capacity has its own consequences. Seasonal flights, extra sailings and summer-only accommodation appear for the peak and disappear afterwards, which is why the shoulder can be both cheaper and harder to reach.

The interaction between the two is what produces the odd result that a slightly earlier trip is sometimes both cheaper and more convenient, because capacity has already been added while demand has not yet arrived.

Using the calendar, and the limits of doing so

The most valuable weeks for a flexible traveller are usually those immediately before the main holidays begin and immediately after they end. Conditions are close to peak, the infrastructure is fully open, and the price has not caught up or has already let go.

A useful discipline before booking is to look up the school holiday dates for the countries that feed the destination, and the public holidays for both there and home. It takes a few minutes and it explains most price anomalies you will encounter.

And the obvious concession: for anyone travelling with school-age children, none of this is available, and being told repeatedly that the shoulder season is cheaper is not helpful. In that situation the lever is not when but where, since destinations whose peak is driven by a different market may be perfectly reasonable during your own.