May and late October/November are typically the cheapest months to visit Mexico City in 2026. May is a "shoulder month" that sits between the busy winter peak and the start of the heavier summer rainy season; as a result, airlines and hotels often drop their prices to attract travelers. Similarly, the period in late October and November (excluding the specific days around the Day of the Dead) offers a great balance of lower airfares and pleasant weather. Conversely, December through April is the most expensive time to visit, as the city experiences an influx of "winter sun" tourists and spring breakers. According to 2026 travel data, flying in May can save you up to 30–40% on flight costs compared to the December holiday rush. If you are on a strict budget, visiting during the peak of the rainy season (July and August) can also yield hotel deals, but you will have to contend with daily afternoon downpours that might disrupt outdoor sightseeing.