New Delhi: SpiceJet’s cheaper-than-train-fares, announced on Wednesday, are expected to further intensify the ongoing air fare war in the domestic airline industry. The budget carrier is selling one-way air tickets for as low as Rs 599 (all-inclusive), making it the cheapest offer announced so far this year. SpiceJet’s latest offer is for travel between July 1 and October 24, 2015; bookings can be done between February 11 and 13 (both dates included). The fares are non-refundable and non-changeable, SpiceJet said in a statement. The cheapest air fare offer, thus far, was from AirAsia India, which had priced tickets for as low as Rs 699 (all-inclusive) on advance bookings.