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

Return flights

15 Sep - 21 Sep	TAP
15 Sep - 20 Sep	TAP
25 Sep - 29 Sep	TAP
25 Sep - 30 Sep	TAP
17 Sep - 27 Sep	TAP
18 Sep - 27 Sep	TAP
18 Sep - 21 Sep	TAP
19 Sep - 27 Sep	TAP
10 Sep - 21 Sep	TAP
15 Sep - 27 Sep	TAP
26 Sep - 05 Oct	TAP
28 Sep - 05 Oct	TAP
24 Sep - 04 Oct	TAP
05 Sep - 12 Oct	TAP
24 Sep - 03 Oct	TAP
25 Sep - 03 Oct	TAP
26 Sep - 03 Oct	TAP
29 Sep - 04 Oct	TAP
29 Sep - 06 Oct	TAP
24 Sep - 01 Oct	TAP

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 $407

Return flights