The cheapest month to fly south from Vilnius is the one nobody books
Everyone knows summer costs more. Almost nobody has looked at how much the rest of the year varies on a single route, or noticed that the cheap months run in a block rather than turning up at random.
There is a particular kind of advice that circulates about flight prices, and most of it is about the day of the week. Book on a Tuesday. Fly on a Wednesday. Clear your cookies. Some of it is folklore, some of it was true once, and almost none of it survives contact with what a route actually does over a year.
The month is different. The month is the largest single lever a traveller controls, it is not a secret, and it is visible in any dataset that covers enough of the calendar. What is less obvious is the shape: the cheap months are not scattered, they arrive in a run, and the run is longer than most people are willing to believe.
Flexibility on the week is worth a little. Flexibility on the month is worth the whole trip.
One route, twelve months
Vilnius to Malaga is a useful example because it is flown all year, by more than one carrier, to somewhere that is pleasant in every season.
Below is the lowest one-way fare we measured in each month on that route. It is not a forecast and it is not an average of what people paid. It is the floor we actually saw, month by month, on the dates we priced.
Two things stand out. The first is that the expensive months are the obvious ones and the cheap months are a solid winter block rather than a lucky week. The second is how small the whole range is on a route like this: the gap between the dearest month and the cheapest is real, and it is also less than the cost of a bad decision about which airport to fly into.
How to actually use this
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01Pick the month before the destinationIf the trip is flexible, choosing when to travel narrows the price far more than choosing where, and it does so before you have committed to anything.
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02Treat the shoulder as the defaultThe month either side of a peak is usually most of the saving with almost none of the compromise. This is true of nearly every leisure route in Europe.
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03Watch, rather than searchA search is a snapshot of one moment. What matters on a route with a wide monthly range is being told when it moves, which is a different problem from looking harder.
None of this requires a trick. It requires knowing the shape of the year on the route you care about, which is exactly the thing a single search on a booking site cannot show you and a year of measurements can.