British Airways flights from London Heathrow Airport to Seattle (LHR - SEA)

Booking with British Airways 62 days in advance of your planned departure date is, on average, the best time to get cheap flights from London Heathrow Airport to Seattle. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

Currently, the most affordable month to book a British Airways flight from London Heathrow Airport to Seattle in February, with an average price of £395. Conversely, traveling with British Airways from London Heathrow Airport to Seattle in July will be the most expensive, with an average cost of £549. Various factors influence flight prices, so comparing airlines, departure airports, and times can help reduce costs.

In terms of precipitation, rainfall in Seattle ranges from 18.0 - 168.0 inches per month. November is typically the wettest month, when rainfall can reach 168.0 mm. July is typically the driest time to visit Seattle when rainfall is around 18.0 mm.

If weather is an important factor for your trip to Seattle, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 19.0 C. Travellers hoping to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 5.0 C).