Under the offer, the lowest-priced Mumbai-London return ticket would start at Rs 40,252 for economy travel from October 1-31, this year, the airline said in a statement.
"We, at British Airways, are pleased to introduce this once-in-a-lifetime offer for our customers from Mumbai as part of our 90 years' anniversary celebration in the market," Christopher Fordyce, BA's Regional Commercial Manager (South Asia), told PTI from Mumbai.
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To questions, he said this one-day offer was not "just another flash sale" but meant only to commemorate the 90th anniversary.
Asked whether several foreign airlines like Lifthansa, Qatar Airways and Emirates were offering to attract Indian customers due to excess capacity, Fordyce said such offers were a regular feature in the aviation market and not generally driven by excess capacity.
"It is a fight for the market....Not too much for additional caparity," he said, adding that this was an offer for "our loyal customers".
The flash sale came weeks after the airline came out with one of the biggest sale offers of up to 50 per cent on flights from India to select destinations in the UK, the USA, Europe, Latin America, Caribbean and London. This earlier offer is valid till September 30.