Delhi (DEL) to London (LON): 4,183 miles (6,732 km) great-circle, about 8h 50m nonstop by our estimate. Cheapest fare observed: $630 round-trip on IndiGo, with 1 stop, departing May 2, 2026.
$630 round-trip, IndiGo 6E1307, departing 2026-05-02 at 21:30, returning 2026-05-09. The recorded itinerary left on a Saturday, returning on a Saturday 7 nights later; the fare was observed 7 days before departure. "Book this flight" opens Kiwi.com with the same airline and dates.
At $630, it ranked 24th of the 30 round-trip fares we recorded from DEL (median $371). That is 15.1 cents per great-circle mile (round-trip price over one-way distance), below the DEL median of 27.9 cents across 30 round-trip routes.
Routes from DEL of similar length: St. Petersburg (3,063 mi) at $575 and Minsk (3,005 mi) at $830.
IndiGo had the cheapest fare on 4 of 30 DEL routes. It is the longest of the 30 routes we track from DEL.
Of 49 departure airports with a fare to London, Delhi (DEL) ranked 19th at $630. Lowest: $46 from Dublin (DUB); highest: $1356 from Sydney (SYD); 14 nonstop. Cheapest-fare airlines (routes): Ryanair (7), easyJet (4), Etihad (4), Frontier (4), Air Canada (3) and WestJet (3), plus 19 more.
That depends on your passport and trip, so check the official source for United Kingdom: GOV.UK: check if you need a UK visa. Connecting elsewhere? Check that country's transit rules too.
Travelpayouts fares (cheapest per route, observed April 25, 2026); OurAirports coordinates and elevations; IANA zones Asia/Kolkata, Europe/London; flight time is our estimate.