Air Canada has extended their "almost indecent" sale and will continue to offer some of the best summer fares to London (Heathrow) and Manchester from anywhere they fly in the U.S.
Last travel date is now March 7, 2008, but the sale ends July 17. The best seats for most of July have already been taken, but are still widely available in August. Fares are lower for travel later in the year.
Some sample fares:
|New York La Guardia||London||$670|