Booking with Finnair 87 days in advance of your planned departure date is, on average, the best time to get cheap flights from London to Philadelphia. 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 Finnair flight from London to Philadelphia in May, with an average price of £279. Conversely, traveling with Finnair from London to Philadelphia in December will be the most expensive, with an average cost of £372. Various factors influence flight prices, so comparing airlines, departure airports, and times can help reduce costs.
The most Finnair flights from LON to PHL are scheduled on a Wednesday (2 on average). You will have fewer Finnair flight options on Monday, which is when the least amount of flights are scheduled (1 on average).
In terms of precipitation, rainfall in Philadelphia ranges from 69.0 - 112.0 inches per month. July is typically the wettest month, when rainfall can reach 112.0 mm. February is typically the driest time to visit Philadelphia when rainfall is around 69.0 mm.
If weather is an important factor for your trip to Philadelphia, 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 26.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 1.0 C).
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