Icelandair made news last month when it announced plans to fly De Havilland Canada Dash 8 turboprop planes on two relatively long routes – for a turboprop, at least – from its main hub near Reykjavik.The flights from Reykjavik (KEF) to Manchester (MAN), England, and Dublin (DUB), Ireland, are scheduled to begin July 15.Here at TPG, that got us thinking. We wanted to see how those routes stacked up against other routes flown by the Dash 8 (formerly known as the Bombardier Q400).It turns out, KEF-MAN hums its way to the second-longest Dash 8 route on the schedule this summer. It’s surpassed only by a once-a-week Dash 8 flight between Linz, Austria, and Rhodes, Greece, that’s operated by Austrian Airlines.Here are the top 10 routes by distance for the week of July 22, according to flight-data firm OAG:The longest routes flown by Dash 8 planes.Linz, Austria (LNZ) – Rhodes, Greece (RHO), Austrian Airlines, 1,079 milesReykjavik, Iceland (KEF) – Manchester, England (MAN), Icelandair, 1,026 milesAlgiers, Algeria (ALG) – Tamanrasset, Algeria (TMR), Tassili Airlines, 968 milesAlgiers, Algeria (ALG) – Djanet, Algeria (DJG), Tassili Airlines, 933 milesReykjavik, Iceland (KEF) – Dublin, Ireland (DUB), Icelandair, 930 milesAtyrau, Kazakhstan (GUW) – Nur-Sultan, Kazakhstan (TSE), Qazaq Air, 925 milesGran Canaria, Spain (LPA) – Ponta Delgada, Portugal (PDL), SATA Air Acores, 902 milesJohannesburg, South Africa (JNB) – Walvis Bay, Namibia (WVB), South African Airways, 881 milesSouthampton, England (SOU) – Alicante, Spain (ALC) – Flybe, 876 milesYuzhno-Sakhalinsk, Russia (PKC) - Petropavlovsk, Russia (UUS), JSC Aurora Airlines, 819 milesSource: OAG. Data looked at all regularly scheduled airline flights operating at least once a week during the week of July 22. Some flights may be operated for regional affiliates under the name of larger mainline carriers.Sign up for our daily newsletterEmail addressSign upI would like to subscribe to The Points Guy newsletters and special email promotions. The Points Guy will not share or sell your email. See privacy policy.