Fly nonstop from Philadelphia to London for $691 round-trip on British Airways.
Seen below, we found seats for travel in late spring, departing PHL on Thursday, May 5, returning from LHR on Sunday, May 15.
Other dates are also available for travel in April/May, with slightly lower fares ($688) available for travel in January, February, and March.
See our fare details for booking info.
Need a room in London? Here's what's available for the above dates on Hotelwatchdog.