AirHint found the following cheapest return flights from Newark (EWR) to Lisbon (LIS) in October 2025 (see full year).

Return flights

10 Oct - 17 Oct	Air Canada
14 Oct - 21 Oct	Air Canada
15 Oct - 19 Oct	Icelandair
04 Oct - 12 Oct	Icelandair
09 Oct - 16 Oct	Air Canada
13 Oct - 20 Oct	TAP
15 Oct - 22 Oct	TAP
15 Oct - 22 Oct	TAP	direct
14 Oct - 21 Oct	TAP	direct
07 Oct - 13 Oct	United
29 Oct - 02 Nov	Icelandair
30 Oct - 11 Nov	TAP	direct
30 Oct - 10 Nov	SWISS
18 Oct - 03 Nov	SWISS
30 Oct - 10 Nov	TAP	direct
29 Oct - 02 Nov	TAP	direct
28 Oct - 01 Nov	TAP	direct

Also check the deals for one-way flights from Newark to Lisbon in October.

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 Newark to Lisbon in October from 344€

Return flights