as the crow flies
From Longman Dictionary of Contemporary Englishas the crow fliesas the crow fliesSTRAIGHTin a straight line ten miles from here as the crow flies → crowExamples from the Corpusas the crow flies• My house is ten miles from here as the crow flies.• The distance between Avonmouth, near Bristol, and Poole in Dorset is only 65 miles as the crow flies.• The course should be five and a half miles as the crow flies.• Similarly a stone's throw, as the crow flies, etc.