AirHint found the following cheapest return flights from Bilbao (BIO) to Newark (EWR) in September 2025 (see full year).

Return flights

24 Sep - 28 Sep	United
22 Sep - 29 Sep	SWISS
25 Sep - 28 Sep	Vueling Airlines
29 Sep - 09 Oct	United
23 Sep - 30 Sep	Delta
25 Sep - 30 Sep	Vueling Airlines
18 Sep - 29 Sep	TAP
24 Sep - 04 Oct	Vueling Airlines
29 Sep - 08 Oct	SWISS
18 Sep - 23 Sep	TAP
27 Sep - 04 Oct	Vueling Airlines
21 Sep - 28 Sep	TAP
29 Sep - 02 Oct	Vueling Airlines
24 Sep - 01 Oct	Lufthansa
19 Sep - 27 Sep	Vueling Airlines
20 Sep - 04 Oct	Vueling Airlines
19 Sep - 20 Sep	Vueling Airlines
29 Sep - 07 Oct	Vueling Airlines
26 Sep - 03 Oct	Vueling Airlines
29 Sep - 04 Oct	Vueling Airlines

Also check the deals for one-way flights from Bilbao to Newark 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 Bilbao to Newark in September from 438€

Return flights