Fly nonstop from Philly to London for $695 round-trip on Delta.
Seen below, we found seats departing PHL on Wednesday, March 23, returning from LHR on Thursday, March 31.
Other dates are also available for travel from September through late March. Slightly higher fares ($699) are available for travel through May.
For booking info, see our Fare Details.
Need a room in London? Here's what's available on Hotelwatchdog for the above dates.