New Delhi, Feb. 4 -- IndiGo has announced changes in its schedule of long-haul flight routes including suspending services to Copenhagen from 17 February, as the airline seeks to tackle external operational constraints.

As part of the adjustments, necessitated by Iranian airspace uncertainties and congestion at airports, the budget carrier on Wednesday said it will also reduce flights on Delhi-London Heathrow and Delhi-Manchester routes.

The flights to and from Copenhagen (Denmark) will be suspended from February 17 till further notice. Currently, the airline operates services between Mumbai and Copenhagen three times a week.

From February 7, the carrier will reduce its Delhi-Manchester services to four times a week from five times per...