Cheapest return flights from Seattle to Keflavik in December from 339€
AirHint found the following cheapest return flights from Seattle (SEA) to Keflavik (KEF)
in December 2025 (see full year ).
Return flights
01 Dec
- 08 Dec
Icelandair
339 €
direct
02 Dec
- 09 Dec
Icelandair
339 €
direct
03 Dec
- 10 Dec
Icelandair
339 €
direct
04 Dec
- 11 Dec
Icelandair
339 €
direct
05 Dec
- 12 Dec
Icelandair
339 €
direct
07 Dec
- 14 Dec
Icelandair
339 €
direct
08 Dec
- 15 Dec
Icelandair
339 €
direct
09 Dec
- 16 Dec
Icelandair
479 €
direct
10 Dec
- 17 Dec
Icelandair
479 €
direct
11 Dec
- 18 Dec
Icelandair
479 €
direct
29 Dec
- 05 Jan
Icelandair
619 €
direct
30 Dec
- 06 Jan
Icelandair
691 €
direct
28 Dec
- 03 Jan
Icelandair
764 €
direct
25 Dec
- 01 Jan
Icelandair
764 €
direct
26 Dec
- 02 Jan
Icelandair
764 €
direct
27 Dec
- 03 Jan
Icelandair
764 €
direct
28 Dec
- 04 Jan
Icelandair
764 €
direct
Also check the deals for one-way flights from Seattle to Keflavik in December .
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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