Icelandair via ShermansTravel offers select Icelandair Roundtrip Fares to London, England, with prices starting at $478.38. (On the ShermansTravel landing page, click on "Icelandair.us" in the top line to see this sale.) This price is valid on flights departing on February 20, 2018, from Boston, MA, (BOS) with arrival in London, England, (LGW) and return on February 28. That's the lowest price we could find for select routes on comparable airlines by at least $30. Book this travel deal by January 13, 2018.

All prices, dates, and booking details were valid at the time of publication.