I'm need to fly to JFK in May and have an open return ticket to LIS following a previous ex-LIS trip. According to the BA Portugal website, the F fare ex-LIS in F to JFK is €2976. However, trying variations of different dates I keep getting the lowest fare of €3853.

Any ideas how I might achieve the lowest possible F fare? When do BA Portugal update this page http://www.britishairways.com/travel...t/public/en_pt with the post March offers?