The second week of September is when the Day of the Dead advice starts circulating again, and most of it gets repeated without anyone checking whether it survived contact with a booking screen. Three claims, then. Two hold up. The third, the one people repeat most confidently, does not.
Book early for Day of the Dead, because the whole city sells out
Mostly true, and the mechanism is duller than the myth. Mexico City’s Day of the Dead parade draws crowds on a scale that did not exist a decade ago, and the hotel stock around Centro Histórico and Roma Norte has not grown to match it. Flights follow the same curve. By the time October half-term in the UK and the US fall break collide with November 1 and 2, the cheap economy buckets on the nonstop London to Mexico City and Madrid to Mexico City routes are gone — not because demand spiked overnight but because there were never many seats in those buckets to begin with. Oaxaca is worse. Smaller city, fewer widebodies, and connections through Mexico City eat the savings. If you are set on Oaxaca for the comparsas and the graveside vigils at Xoxocotlán, book by early summer or accept a two-stop routing.
If you are flying to a Halloween event, book midweek and you will pay less
Partly true, and widely misunderstood. Midweek departures genuinely cost less on leisure routes, because Tuesday and Wednesday flights carry fewer weekend-trippers. That part holds. What does not hold is the idea that the day you buy determines the price. Spend an afternoon refreshing the search I trust for this route and you will watch the fare move twice for reasons that have nothing to do with the calendar. Airlines release seats in batches, and each batch is priced against what is left. The same applies to the persistent myth about private browsing. Your cookies are not the lever. Inventory is.
Compare the whole trip, not the headline fare
This is the claim worth testing hardest, because it is where most people quietly lose money. A £180 return to a European city with a Halloween market looks cheap until you add the bag, the seat, and the airport transfer. Run the same discipline on long-haul: Kupi.com’s London – New York City flight comparison shows the spread between carriers, and the cheap-looking option is frequently the one with the worst arrival time and the longest connection.
What decides the real cost, beyond the fare itself:
1.Whether a checked bag is included or charged each way
2. The arrival airport and its distance from where you are actually sleeping
3. Connection length, since a four-hour layover often means a paid lounge
4. Whether the return date sits inside a school holiday
For a genuine Day of the Dead trip, flying wins and nothing else comes close. The train does not cross the Atlantic, and driving to Oaxaca from most of the US is a three-day commitment each way. Not a close call. On shorter European hops to Halloween markets, the picture flips, and a night train or a coach frequently beats the airport experience outright once you count the security queue and the baggage fee.
The old rule of thumb, one a retired teacher can still remember being printed in newspaper travel sections, was six weeks. That number was never universal and it is less useful now. Short-haul leisure routes tend to bottom out a few weeks ahead. Long-haul and anything tied to a fixed date, which is exactly what November 1 and 2 are, reward booking months earlier, because the date does not move and neither does the crowd.
What actually matters is whether your dates are fixed. If they are, the fare only goes one way from here, and every week you wait costs you money. If they are not, you have the one advantage that counts, which is the freedom to fly the Tuesday nobody else wants.
