AirHint found the following cheapest return flights from Basel (BSL) to New York (JFK) in September 2025 (see full year).

Return flights

22 Sep - 28 Sep	Air France
20 Sep - 22 Sep	Delta
20 Sep - 27 Sep	Delta
20 Sep - 03 Oct	Delta
20 Sep - 06 Oct	Delta
25 Sep - 30 Sep	Air France
29 Sep - 05 Oct	Air France
29 Sep - 12 Oct	Delta
18 Sep - 01 Oct	easyJet
17 Sep - 24 Sep	easyJet
18 Sep - 25 Sep	easyJet
18 Sep - 21 Sep	easyJet
19 Sep - 21 Sep	easyJet
30 Sep - 02 Oct	easyJet
14 Sep - 24 Sep	easyJet
21 Sep - 27 Sep	Delta
26 Sep - 20 Oct	Delta

Also check the deals for one-way flights from Basel to New York in September.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest return flights from Basel to New York in September from 437€

Return flights