Fly nonstop from Philly to London for $685 round-trip on British Airways.
Searching BA, 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 winter/spring travel through mid-May.
Fares may be a few bucks lower for travel in early spring.
See our fare details for booking info.
Need a room in London? Here's what's available for the above dates on Hotelwatchdog.