The following blog posts mention 'september', but...

Air Transat has dropped the price of their fall flights to London Gatwick down to $629 roundtrip after tax.

A large number of Air Transat flights to Manchester in September have fallen to $584 roundtrip after tax...

Update: Looks like this is part of a price war between Delta and United for not only flights to Phoenix, but to Charlotte, North Carolina and Philadelphia as well. All 3 cities are available throughout the calendar year, including Christmas, for around $320 roundtrip after tax.

Allegiant Air (out of Kalispell) now has some flights in September for closer to $100 roundtrip after tax to Las Vegas and back.

Air Transat just dropped the price of their August 27 to September 19 flight down to $584 roundtrip after tax.

I recently posed this question to Calgarians on the Ycheap.com forums and the response was overwhelming...

Air Transat just released a direct flight to Munich and back for $671 roundtrip after tax.

The Royal Decameron Complex in Puerto Vallarta, Mexico has dropped to $677/person after tax on the following departure dates...

Mexicana Airlines has flights to Panama City (PTY) in October and November for $650 roundtrip after tax.

Europe has been ridiculously expensive for summer travel this year. Until now.