Cheapest return flights from Seattle to Keflavik in September from 319€
AirHint found the following cheapest return flights from Seattle (SEA) to Keflavik (KEF)
in September 2025 (see full year ).
Return flights
02 Sep
- 09 Sep
Air Canada
319 €
02 Sep
- 09 Sep
Icelandair
328 €
direct
25 Sep
- 02 Oct
Icelandair
339 €
direct
29 Sep
- 06 Oct
Icelandair
339 €
direct
30 Sep
- 07 Oct
Icelandair
339 €
direct
01 Sep
- 08 Sep
Icelandair
350 €
direct
03 Sep
- 10 Sep
Icelandair
350 €
direct
23 Sep
- 30 Sep
Icelandair
350 €
direct
04 Sep
- 11 Sep
Icelandair
350 €
direct
05 Sep
- 12 Sep
Icelandair
350 €
direct
06 Sep
- 13 Sep
Icelandair
350 €
direct
09 Sep
- 16 Sep
Icelandair
350 €
direct
10 Sep
- 17 Sep
Icelandair
350 €
direct
23 Sep
- 08 Oct
Icelandair
355 €
direct
24 Sep
- 01 Oct
Icelandair
534 €
direct
26 Sep
- 03 Oct
Icelandair
534 €
direct
28 Sep
- 05 Oct
Icelandair
534 €
direct
27 Sep
- 08 Oct
KLM
798 €
Also check the deals for one-way flights from Seattle to Keflavik 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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