Flight Deals
The Cheapest Week to Fly in January
January is not one price. It is four very different weeks wearing the same name, and the gap between the most and least expensive can be larger than the fare itself.
People say “January is cheap” as though the month has one price. It does not. January contains the single most expensive week of the winter and, about ten days later, some of the cheapest long-haul dates of the entire year.
Understanding the shape of that curve is the highest-value thing you can learn about booking winter travel.
Why the dip exists at all
Airlines schedule aircraft months ahead. Those aircraft fly whether or not anyone books them, and the marginal cost of one more passenger is small. So when demand collapses, carriers discount hard rather than fly empty.
Demand genuinely does collapse in January. The Christmas and New Year rush ends abruptly. Schools go back. Most people have just spent their disposable income, and almost nobody starts a holiday in the second week of January. Meanwhile the schedule is still sized for the December peak.
That mismatch — full schedule, empty demand — is the January dip. It is the most reliable seasonal discount in aviation.
The four weeks of January
| Window | Demand | What to expect |
|---|---|---|
| 27 Dec – 3 Jan | Extreme peak | Highest fares of the winter. Returns especially |
| 4 – 6 Jan | Falling fast | Outbound cheap, return still expensive |
| 7 – 22 Jan | Trough | The cheapest fares of the year on most long-haul routes |
| 23 – 31 Jan | Rising gently | Half-term and February demand starts to price in |
27 December to 3 January — avoid if you possibly can
This is not “January pricing”, it is New Year pricing. Both legs are in demand, and late booking is punished harder here than at any other time of year. If your dates are fixed by family commitments, book twenty to thirty weeks out and accept it.
4 to 6 January — the asymmetric window
An interesting few days. The outbound has already fallen off a cliff because nobody is leaving. The return is still full of people coming home from Christmas.
If you are flying out on 5 January and back on 19 January, you are buying the cheap half of both curves. That specific shape — leave just after the peak, return deep in the trough — is frequently the best-value long-haul ticket available all year.
7 to 22 January — the trough
This is the window. Two full weeks where leisure demand is at its annual minimum on most long-haul routes.
Within it, midweek departures are cheaper than weekend ones. A Tuesday or Wednesday departure with a Tuesday or Wednesday return is typically the cheapest combination on the board, because you are avoiding both the weekend-break market and the Sunday-night return crowd.
23 to 31 January — the climb back
Fares start to firm up as February half-term, Valentine’s weekend and ski season demand enter the booking window. Still good value, but the deepest discounts have gone.
A worked example
Take a return from London to Bangkok. Keep everything else identical — same carrier, same cabin, same routing — and move only the dates:
- Depart 30 December, return 13 January: you are buying the most expensive outbound of the winter.
- Depart 6 January, return 20 January: you are buying the cheapest outbound and the cheapest return.
Same trip length. Same destination. Same aircraft. The gap between those two tickets is routinely several hundred pounds per person, and on a family of four it can exceed the cost of the accommodation.
This is the single question we ask every client first: how fixed are your dates, really? Very often the answer is “we assumed they were”, and moving them by five days changes the budget entirely.
Where the rule bends
The January dip is a demand pattern, and it breaks wherever local demand is doing something else:
- Southern-hemisphere summer. Cape Town, Sydney and Buenos Aires are in peak domestic season. January is the best weather but not the cheapest fare.
- Lunar New Year. When it falls in late January, routes to and within East and South East Asia tighten sharply. Check the date for your travel year before assuming the trough applies.
- Ski routes. Geneva, Innsbruck, Turin and Salzburg are in high season. The January dip does not exist for alpine airports.
- Aurora destinations. Flights follow the dip, accommodation does not. See the best places to travel in January.
Reading a fare calendar properly
Most comparison tools will show you a month grid of prices. Two things to remember when you look at one:
First, the grid usually prices the cheapest return for each outbound date, which hides the fact that your preferred return date may be expensive. Always confirm the specific pair.
Second, the lowest cell is often a single fare class with one or two seats. It is real, but it disappears fast, and it may carry restrictions — no checked bag, no changes — that make it worse value than the cell next to it.
The honest summary
If you have flexibility, fly out between 6 and 10 January and return between 17 and 22 January. That single sentence is worth more than most fare-hacking advice on the internet.
If you do not have flexibility, book early and stop watching the price — for fixed peak dates, waiting only costs money.
We price the whole window for every enquiry rather than just the dates people send us. If that is useful, tell us roughly when you want to go, or read more on how January fares move and how far ahead to book.
Keep reading
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When to book January flights for the lowest fare
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