Cheapest return flights from Denver to Keflavik in September from 382€
AirHint found the following cheapest return flights from Denver (DEN) to Keflavik (KEF)
in September 2025 (see full year ).
Return flights
02 Sep
- 31 Oct
Icelandair
382 €
direct
29 Sep
- 06 Oct
Icelandair
424 €
direct
22 Sep
- 02 Oct
Icelandair
447 €
direct
21 Sep
- 02 Oct
Icelandair
447 €
direct
22 Sep
- 03 Oct
Icelandair
447 €
direct
05 Sep
- 12 Sep
Frontier Airlines
448 €
24 Sep
- 01 Oct
Frontier Airlines
453 €
25 Sep
- 02 Oct
Air Canada
480 €
24 Sep
- 01 Oct
Icelandair
488 €
direct
25 Sep
- 02 Oct
Icelandair
489 €
direct
05 Sep
- 07 Sep
Icelandair
490 €
direct
18 Sep
- 25 Sep
Icelandair
499 €
direct
20 Sep
- 02 Oct
Frontier Airlines
507 €
19 Sep
- 26 Sep
WestJet
521 €
23 Sep
- 30 Sep
Virgin Atlantic
526 €
12 Sep
- 19 Sep
jetBlue
535 €
23 Sep
- 30 Sep
Icelandair
554 €
direct
05 Sep
- 12 Sep
Icelandair
620 €
direct
19 Sep
- 26 Sep
Icelandair
642 €
direct
12 Sep
- 19 Sep
Icelandair
770 €
direct
Also check the deals for one-way flights from Denver 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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