We're seeing some excellent deals on Delta and United flights to London for winter/late summer travel.
Travel dates range from January through late March, and again from September onward. You'll find the lowest fares are for weekday travel, with slightly higher fares for weekends.
This sale is unadvertised, meaning these fares could vanish at any time. Should something catch your eye, better book quickly.
Fort Lauderdale to London $563 round-trip
Portland to London $572 round-trip, nonstop
Minneapolis to London $573 round-trip, nonstop
Philadelphia to London $579 round-trip, nonstop
Washington DC to London $594 round-trip
Detroit to London $662 round-trip, nonstop
Atlanta to London $663 round-trip, nonstop