May is by far the best month, wherein you can get cheapest flights for Denver to Keflavik. Meanwhile, June is perceived as the expensive month due to the varying factors. That’s why it’s highly advised to make advanced online flight booking to save huge amounts of money.
May- During this month the footfall is less so, the flight is gradually inexpensive.
May - is the cheapest month to book round trip flights.
Cheapest Fare- Currently, this is the fare price based on the current demand.
Disclaimer - All the mentioned fares were found within last 48 hrs. The displayed fares are based on historical data and are subject to change. The fares cannot be guaranteed at the time of booking.

Denver
16:40
Denver International Airport [DEN]
Thu , 14 May 2026

Keflavik
06:00
Keflavik International Airport [KEF]
Fri, 15 May 2026

Denver
16:45
Denver International Airport [DEN]
Thu , 14 May 2026

Keflavik
08:30
Keflavik International Airport [KEF]
Fri, 15 May 2026

Denver
10:27
Denver International Airport [DEN]
Thu , 14 May 2026

Keflavik
06:20
Keflavik International Airport [KEF]
Fri, 15 May 2026

Denver
12:35
Denver International Airport [DEN]
Thu , 14 May 2026

Keflavik
09:30
Keflavik International Airport [KEF]
Fri, 15 May 2026

Denver
10:27
Denver International Airport [DEN]
Thu , 14 May 2026

Keflavik
06:20
Keflavik International Airport [KEF]
Fri, 15 May 2026

Denver
16:10
Denver International Airport [DEN]
Thu , 14 May 2026

Keflavik
07:40
Keflavik International Airport [KEF]
Fri, 15 May 2026

Denver
11:15
Denver International Airport [DEN]
Thu , 14 May 2026

Keflavik
08:30
Keflavik International Airport [KEF]
Fri, 15 May 2026

Denver
10:48
Denver International Airport [DEN]
Thu , 14 May 2026

Keflavik
06:20
Keflavik International Airport [KEF]
Fri, 15 May 2026











To crack the better offer on Denver to Keflavik flights, it’s better to make advanced bookings at least few weeks prior of your intended date because price might rise eventually due to the delay.
Weekdays are the best day to get low-cost flight tickets from Denver to Keflavik. However, it depends on a certain factor. If the demand is high and festivals are there, then prices could be a little high.