Fly from New York to London this spring for $417 round-trip, nonstop, including all taxes, on Delta Airlines. This fare is available for departures through April 12, and allows for returns up to 12 months. We also like the 3-day advance purchase for this one!
If you don't live in or around NYC, no biggie. We've spotted similarly low fares departing from other cities, even from the West Coast:
For a complete listing of fares, please visit our page for London Heathrow.