I’m in northern Spain and have to take a train to Madrid to get to a flight. But I arrive to the train station too late at 11:40 so booking is not an option since most places check in are at 12:00 and I’d probably not get in time.
Would it be too dangerous to stay up all night on the street?
I’ve slept at various airports under just these circumstances. Pretty common.
According to https://www.sleepinginairports.net/guides/madrid-barajas-airport-guide.htm the airport is open 24 hours so they can just hang there. Allowing about an hour to get to the airport they’d only have five hours or so. By airport waiting standards that’s nothing!