The straight-line (great-circle) distance between Alberta and England is approximately 7,278 km (4,523 miles).
A direct flight from Edmonton International (YEG) to London Heathrow (LHR) covers ~7,699 km (4,784 miles) and takes about 9 hours 15 minutes.
Actual travel time varies with routing, layovers, winds, and airport choices (Calgary YYC is another major Alberta gateway).