Ask HN: Does this flight discovery tool exist?

So I'm going to be at a particular Lat/Long, and I want to travel to another specific Lat/Long. What I'd like is a tool that finds the closest airports, and then a common airline to fly between them.

Recently I needed a flight from Montauban, France, to somewhere in the North-West of England. I've found a direct flight from Toulouse to Birmingham, but that took a considerable amount of searching.

I've written something similar for train journeys, and I can do it again, but I was wondering if this already exists.

Suggestions?

Edit: Both suggestions so far are pretty good. Significantly worse than the result I found by hand, but either would have saved me at least 50% of my time by suggesting initial candidates.

Thanks - I look forward to more suggestions.