PHL to LON, Philadelphia International Airport to Cheap Flights

Based on HopeGoo data, Frontier Airlines offers one-way fares as low as US$184 on Cheapest nonstop routes (e.g. PHL to LGW on Mon, Mar 23), while British Airways offers Cheapest nonstop round-trips from US$583 departing on Wed, Mar 11 and returning on Tue, Mar 17.

It takes about 7 hours to fly from Philadelphia to London.

By analyzing data from all airlines on the HopeGoo flight calendar, it looks like the best time to book a flight from Philadelphia to London is around 40 days (6 weeks) in advance, and the best time to fly is usually on Tuesday, Wednesday, and Saturday. Tuesday typically offers the cheapest flights for departure, while Saturday offers the best return deals.

To find best deals on flights from Philadelphia to London, you can use various tools on HopeGoo: · Be flexible with your travel dates to get the cheapest flight deal. Now the cheapest flight deal is on Mon, Mar 23, with one-way flights priced at just US$184. · Compare airlines strategically. Budget carriers often provide the lowest base fares, while we found the most affordable airline currently operating on this route is Iberia. · Set up price alerts to easily monitor ticket prices without having to check every day. · Check HopeGoo flight deals and promo codes frequently. · Avoid peak season unless you book very early. It seems the peak season for London travel is around January. · Get exclusive promo codes for HopeGoo app users.

The cheapest months to fly from Philadelphia to London is August, when demand for travel is lower.

After crunching the numbers on our February flight calendar, it's currently cheapest to fly from Philadelphia to London on February 12, 2026 with Frontier Airlines, with prices starting at US$558.

The time difference between London and Philadelphia is 5h.

Tickets can only be changed or canceled if permitted by airline policy. To submit a change or cancellation request, go to the flight bookings page, select the option to change or cancel your HopeGoo, choose the relevant passengers and segment, and submit a request. Please note that additional charges may apply according to the airline ticket policy. However, if the flight has been rescheduled and you would like to change or cancel your ticket, you can submit an involuntary cancellation request. For more details about change and cancellation policies, please check the customer support pages.