AirHint found the following cheapest return flights from Philadelphia (PHL) to Keflavik (KEF) in January 2026 (see full year).

Return flights

12 Jan - 19 Jan	Finnair
19 Jan - 26 Jan	Finnair
13 Jan - 20 Jan	Finnair
05 Jan - 12 Jan	Finnair
06 Jan - 13 Jan	Finnair
20 Jan - 27 Jan	British Airways
18 Jan - 25 Jan	British Airways
30 Jan - 03 Feb	Finnair
24 Jan - 30 Jan	British Airways
24 Jan - 31 Jan	jetBlue

Also check the deals for one-way flights from Philadelphia to Keflavik in January.

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 Philadelphia to Keflavik in January from $511

Return flights