I fly home for Christmas every year of my degree. Four December flights paid for so far, and two of them were overpaid. When every guide tells you to book early, that advice is not wrong. But “early” is doing a lot of work in that sentence. The useful question is not when to book, it is which specific date you are willing to move.
First: the date, before I look at a single fare
Before I open anything, I write down three candidate outbound dates and three return dates. On a Lisbon to Brussels one-way I once compared three December dates — the 19th, the 21st and the 23rd. The 23rd came in about 60 euros cheaper, which is roughly the cost of a week of groceries for me. Everyone wants to fly on the Friday that school breaks up. That Friday is the worst-priced day of the whole month.
- The actual departure day I want
- The day before and the day after
- Whether a coach or train could cover the first leg instead
- The price of flying home on the 27th instead of the 26th
- What it costs to come back on the 2nd or 3rd of January
The return leg is where people lose money. They fix the outbound, then discover that 2 January is priced like a concert ticket. If your term does not start until the 8th, flying back midweek in the first week of January can be half the price. My own rule: never book a return I cannot move.
Then: the calendar, with the whole month visible
A price calendar, not a single-date search, is the only way I shop for these. I keep a fare map open on the Ryanair Lisbon to Brussels route, and on 4 October the 24th sat 90 euros above the 25th. That tells me more in ten seconds than a week of reading predictions. I do this in the last week of September for a December trip, and again in mid-October, mostly to confirm the trend rather than to book.
Short-haul within Europe bottoms out about four to six weeks before departure, which for a 20 December flight means the first half of November. Transatlantic fares behave nothing like that: for a December crossing, the ones I have watched were already climbing by early October, and the cheapest seats went to people booking in August. So saying “book six weeks ahead” is meaningless unless you say which of those two you are on. When I could not decide between Lisbon and Porto for a December trip, I used this link to see a route’s whole month at a glance.
Last: bags, seats and the airport run
By this point I know my date and roughly my price. Bags and ground transport are what quietly ruin the comparison. A 29-euro Ryanair fare becomes 60 euros the moment I add a cabin bag, which is why I now fly with a 40x30x20 rucksack and nothing else. Wizz Air is the same game on different routes. The coach to the airport takes 55 minutes and costs 4 euros, and the train is 12, so the cheap flight is only cheap if the ground leg stays cheap too.
For a lot of European Christmas trips the train wins. A direct rail ticket booked in October for the same week often costs less than a bag-included flight, and it drops you in the city centre instead of a runway an hour outside it. I say that as someone who flies constantly.
Shift your travel by two days at either end. That is the whole trick.
