New Delhi, Nov. 12 -- Low-cost carrier SpiceJet Ltd's loss increased about 36% year-on-year to Rs.621 crore in the July-September quarter, hurt by foreign exchange losses and as many of its planes remained grounded for maintenance.

Loss in the previous quarter was Rs.234 crore and Rs.458 crore in the year-ago-period. Revenues declined both sequentially and year-on-year by 30% and 15%, respectively, to Rs.730 crore.

The Ajay Singh-promoted airline suffered a Rs.190-crore forex loss, compared with a Rs.5 crore gain a year earlier, underscoring continued pressure from dollar-denominated lease payments, it said in an exchange filing on Wednesday.

SpiceJet said that non-operation of "the certain part of its fleet for awaited maintenance" co...