British Airways is offering roundtrip fares to London, starting at $317 for flights between New York City's JFK airport and London's Heathrow. (Taxes and fees add between $125 and $243.) Comparable airfares are available from 19 other U.S. cities. For $99 more each way, travelers may upgrade to business class, World Traveller Plus, from any U.S. gateway to London.
Travel is valid from Oct. 25 to Dec. 18, and Dec. 24 to Mar. 25, 2008. If you travel on a Thursday, Friday, Saturday, or Sunday, you'll pay an additional $30 each way. Minimum stay of Saturday night is required. Book by end of the day this Friday (midnight ET). Learn more at ba.com/august.
Related: Zoom is a Canadian discount airline that began competing this summer with British Airways for service between New York City and London's Gatwick airport.
Update: The original post erroneously said the U.S. departure airport for the starting price of $317 was LaGuardia. It's JFK. I regret the error.