Humberside Airport is an international airport at Kirmington in the Borough of North Lincolnshire, England, 10 NM from three large settlements: Grimsby, Hull and Scunthorpe, on the A18, the latter two places reached by longer roads, in the case of Hull via the UK's longest bridge that crosses the Humber Estuary. It is also the main airport to serve Lincoln, the county's largest city 28 miles south via the A15.