KLM flights from London Heathrow to:

Amsterdam from £86
Barcelona from £115
Istanbul from £179
Montreal from £334
New York from £288
Cairo from £312
Beijing from £411

KLM flights from some other regional airports:

Manchester to Amsterdam from £88
Edinburgh to Barcelona from £132
Manchester to Istanbul from £189
Glasgow to Montreal from £328
Birmingham to New York from £285
Manchester to Nairobi from £416
Birmingham to Muscat from £363