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Polish national carrier LOT is currently offering a couple of very competitive fares to the US, with Business Class return flights from London to New York at £1300, and Chicago at £1450.
The sale fares require you to travel in July or August 2016. At the time of writing, the availability of the discounted promo fares is very good.
These prices don’t quite match some of the spectacular sub-£1000 long-haul Business Class flights that we’ve been flagging with Qatar etc recently. However, the outstanding prices here are largely reserved for flying East, with heavily discounted Business Class to the Americas harder to come by.
That said, don’t forget that boutique Business Class airline La Compagnie continues to offer return flights from London to the US round about (or below) the £1,000 mark.