The Real Deal: Round-trip airfare on a major carrier, four nights' accommodations, breakfast daily and fuel surcharges, from $499 per person — plus about $143 in taxes.
When: April 29, May 6, 13, 20, 2009; add $130 for Sept. 16; $140 for May 27, June 3, 10, 17; $180 for Sept. 9, 23; $200 for Sept. 2; $350 for June 24 and Wednesdays in July and August.
Gateways: New York City; add $79 for Miami, $90 for Denver, $110 for Houston, $131 for L.A., and $144 for Seattle; additional gateways available.
The fine print: Does not include about $143 in airport taxes and fees per person. Based on double occupancy; single supplement is $197. Read these guidelines before you book any Real Deal.
Book by: No deadline; based on availability.
Contact: Gate 1 Travel, 800/682-3333, gate1travel.com.
Why it's a deal: A recent Kayak search yielded a $457 round-trip flight in late April (Air France). For just $185 more per person, Gate 1 covers airfare as well as the four-night stay.
Lodging: The lead price includes a stay at the Thistle City Barbican Hotel. Depending on your travel dates, you could also be at the Express By Holiday Inn London Earls Court or the Central Park Hotel. Upgrades are available: Add $10 per person for the Park Inn Hyde Park, $20 per person for the Hilton London Euston, $30 per person for the Thistle Kensington Gardens, and $70 per person for the City Inn Westminster.
Before you go: U.S. citizens will need a valid passport for travel; a visa is not required. For more ideas on what to do, check out London's official tourism site.