May is the cheapest month to fly this route, with average fares around $557 round trip.
Average round-trip fares by departure month, based on current availability.
| Month | Avg Price | Lowest | Relative Cost | |
|---|---|---|---|---|
| May 2026 | $557 | $495 | Best | |
| June 2026 | $569 | $499 | ||
| July 2026 | $578 | $495 | ||
| August 2026 | $676 | $616 | Peak |
Departing on Monday offers the lowest average fares at $543. Friday departures are the most expensive at $622, a difference of $79.
The best time to fly is May. Set up an alert and we'll notify you when prices drop.
Get Started Free →The cheapest month to fly from Seattle to Reykjavik is May, with average round-trip fares around $557. The lowest fare found in May is $495.
Monday departures are the cheapest, averaging $543 round trip. The most expensive day is Friday at $622.
Based on current pricing trends, booking for May travel offers the best value. Avoid August if possible, as fares average $676 compared to $557 in the cheapest month. July is a solid middle-ground option at $578.
Flying in May instead of August can save you approximately $119 per round trip. The cheapest month averages $557 while the most expensive averages $676.
Airlines, flight times, price calendar, and more for Seattle to Reykjavik
View SEA → KEF Details