Booking with Vietnam Airlines 34 days in advance of your planned departure date is, on average, the best time to get cheap flights from London Heathrow Airport to Hanoi. The general trend is that the closer you book to the departure date, the more expensive your flight will be.
For Economy class flights the cheapest month to fly the route is September. The most expensive months are July and March.
In terms of precipitation, rainfall in Hanoi ranges from 14.0 - 296.0 inches per month. August is typically the wettest month, when rainfall can reach 296.0 mm. December is typically the driest time to visit Hanoi when rainfall is around 14.0 mm.
If weather is an important factor for your trip to Hanoi, use this chart to help with planning. For those seeking warmer temperatures, June is the ideal time of year to visit, when temperatures reach an average of 29.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 17.0 C).
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