London (LHR) to Islamabad (ISB): 3,761 miles (6,053 km) great-circle, about 8h 00m nonstop by our estimate. Cheapest fare observed: $851 round-trip on Saudia, with 1 stop, departing April 26, 2026.
$851 round-trip, Saudia SV118, departing 2026-04-26 at 22:10, returning 2026-05-01. The recorded itinerary left on a Sunday, returning on a Friday 5 nights later; the fare was observed 1 day before departure. "Book this flight" opens Kiwi.com with the same airline and dates.
At $851, it ranked 27th of the 30 round-trip fares we recorded from LHR (median $624). That is 22.6 cents per great-circle mile (round-trip price over one-way distance), close to the LHR median of 22.9 cents across 30 round-trip routes.
Routes from LHR of similar length: Almaty (3,494 mi) at $687 and New York (3,442 mi) at $578.
Saudia had the cheapest fare on 2 of 30 LHR routes. It is the 4th longest of the 30 routes we track from LHR.
Of 7 departure airports with a fare to Islamabad, London (LHR) ranked 6th at $851. Lowest: $327 from Abu Dhabi (AUH); highest: $1168 from London (LGW); 0 nonstop. Cheapest-fare airlines (routes): Saudia (3), Air Arabia (1), Azerbaijan Airlines (1), Etihad (1) and Pegasus Airlines (1).
Travelpayouts fares (cheapest per route, observed April 25, 2026); OurAirports coordinates and elevations; IANA zones Europe/London, Asia/Karachi; flight time is our estimate.