The moment the last Christmas market stall packs up, half of Britain starts dreaming of somewhere sunnier. The catch: so does everyone else, and winter flight prices spike accordingly. New data from Expedia's Winter Travel Outlook, based on flight searches made by UK users between 20 July and 19 October 2026, pinpoints exactly which departure dates will cost you the most — and which could save you a fortune.
For international trips, the sweet spots are 4 December 2026 and 18 February 2027. If you're flying domestically, aim for 4 or 7 February 2027. Those dates line up neatly with two quieter windows: before the festive rush properly kicks off, and after the new-year squeeze has faded.
The dates to dodge are less surprising. 16 and 19 December 2026 are the priciest days for international departures — right in the pre-Christmas scramble — while 3 and 13 January 2027 are the most expensive for domestic flights. Expedia also flagged 18 and 19 December as the busiest days for international travel, with 2 and 3 January topping the domestic chart. In other words, the days everyone wants to fly are exactly the days you shouldn't, unless you enjoy paying for the privilege.
Expedia spokesperson Melanie Fish puts it plainly: Christmas and new year are always busy, but travellers with flexible dates can pocket serious savings by going in early December or February. The research doesn't quantify the exact discounts, but the advice is practical enough — set up price alerts, compare a few departure dates side by side, and book before fares harden.
Still stuck for inspiration? The same data shows where British travellers are looking this winter, and there are some unexpected picks. Searches for accommodation in Exuma in the Bahamas have jumped 115 per cent, Quebec City in Canada is up 75 per cent, and Malmö in Sweden has risen 45 per cent — a nice spread of Caribbean sun, North American winter charm and Scandinavian cool.
The takeaway is simple: if your schedule allows it, shift your departure by even a few days and the savings can be significant. Early December gets you cheaper flights plus the bonus of festive markets before the crowds, while mid-February is ideal for chasing sun or snow without peak-season pricing. It's a small amount of calendar flexibility for what could be a meaningful chunk of holiday budget freed up for actually enjoying the trip.
