Gaelic Idioms by Gary Bannister lists díreach trasna na tíre as the Irish version of "as the crow flies"
“As the crow flies” has been in English since at least the mid 18th century; it’s still frequently used in North America, and I’d expect that it remains in common use in the UK and Ireland also.
How do I differentiate between the bird flies, and the insect. There's a fly in the soup?
The link was missing, but I found it. :) Yes, that's an old one, but a good one. :)
Still not working. Unfortunately Duolingo doesn’t like ampersands in links. :(
Anyway, it can be easily found by searching for the Scéal grinn - cuileog san anraith topic.