Icelandair Flight 644 Deals & Information (2025/2026)

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Icelandair Flight 644 Route Deals From $410

The cheapest prices found with in the last 7 days for return flights were $379 and $410 for one-way flights to Keflavik Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Sun, Nov 9 - Fri, Nov 14
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$379 Roundtrip, just found
$379
Roundtrip
just found
Select Icelandair flight, departing Sun, Nov 9 from Washington Dulles Intl. to Keflavik Intl., returning Fri, Nov 14, priced at $379 just found
Sat, Nov 29 - Wed, Dec 3
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$399 Roundtrip, found 7 hours ago
$399
Roundtrip
found 7 hours ago
Select Icelandair flight, departing Sat, Nov 29 from Washington Dulles Intl. to Keflavik Intl., returning Wed, Dec 3, priced at $399 found 7 hours ago
Tue, Dec 9 - Sun, Dec 14
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$412 Roundtrip, found 1 day ago
$412
Roundtrip
found 1 day ago
Select Icelandair flight, departing Tue, Dec 9 from Washington Dulles Intl. to Keflavik Intl., returning Sun, Dec 14, priced at $412 found 1 day ago
Sun, Nov 16 - Mon, Nov 24
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$419 Roundtrip, found 3 days ago
$419
Roundtrip
found 3 days ago
Select Icelandair flight, departing Sun, Nov 16 from Washington Dulles Intl. to Keflavik Intl., returning Mon, Nov 24, priced at $419 found 3 days ago
Tue, Nov 18 - Sat, Nov 22
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$419 Roundtrip, found 1 hour ago
$419
Roundtrip
found 1 hour ago
Select Icelandair flight, departing Tue, Nov 18 from Washington Dulles Intl. to Keflavik Intl., returning Sat, Nov 22, priced at $419 found 1 hour ago
Fri, Dec 5 - Fri, Dec 12
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$422 Roundtrip, found 2 days ago
$422
Roundtrip
found 2 days ago
Select Icelandair flight, departing Fri, Dec 5 from Washington Dulles Intl. to Keflavik Intl., returning Fri, Dec 12, priced at $422 found 2 days ago
Fri, Dec 5 - Thu, Dec 11
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$422 Roundtrip, found 5 days ago
$422
Roundtrip
found 5 days ago
Select Icelandair flight, departing Fri, Dec 5 from Washington Dulles Intl. to Keflavik Intl., returning Thu, Dec 11, priced at $422 found 5 days ago
Wed, Nov 19 - Mon, Nov 24
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$442 Roundtrip, found 1 hour ago
$442
Roundtrip
found 1 hour ago
Select Icelandair flight, departing Wed, Nov 19 from Washington Dulles Intl. to Keflavik Intl., returning Mon, Nov 24, priced at $442 found 1 hour ago
Sun, Nov 9 - Sun, Nov 23
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$444 Roundtrip, found 2 days ago
$444
Roundtrip
found 2 days ago
Select Icelandair flight, departing Sun, Nov 9 from Washington Dulles Intl. to Keflavik Intl., returning Sun, Nov 23, priced at $444 found 2 days ago
Thu, Nov 27 - Thu, Dec 4
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$444 Roundtrip, found 5 hours ago
$444
Roundtrip
found 5 hours ago
Select Icelandair flight, departing Thu, Nov 27 from Washington Dulles Intl. to Keflavik Intl., returning Thu, Dec 4, priced at $444 found 5 hours ago
Mon, Feb 23 - Mon, Mar 2
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$464 Roundtrip, just found
$464
Roundtrip
just found
Select Icelandair flight, departing Mon, Feb 23 from Washington Dulles Intl. to Keflavik Intl., returning Mon, Mar 2, priced at $464 just found
Mon, Nov 17 - Thu, Nov 27
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$467 Roundtrip, found 4 days ago
$467
Roundtrip
found 4 days ago
Select Icelandair flight, departing Mon, Nov 17 from Washington Dulles Intl. to Keflavik Intl., returning Thu, Nov 27, priced at $467 found 4 days ago
Mon, Oct 13 - Thu, Nov 27
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$467 Roundtrip, found 6 days ago
$467
Roundtrip
found 6 days ago
Select Icelandair flight, departing Mon, Oct 13 from Washington Dulles Intl. to Keflavik Intl., returning Thu, Nov 27, priced at $467 found 6 days ago
Sat, Nov 15 - Thu, Dec 25
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$477 Roundtrip, found 23 hours ago
$477
Roundtrip
found 23 hours ago
Select Icelandair flight, departing Sat, Nov 15 from Washington Dulles Intl. to Keflavik Intl., returning Thu, Dec 25, priced at $477 found 23 hours ago
Tue, Feb 10 - Wed, Feb 18
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$487 Roundtrip, found 2 days ago
$487
Roundtrip
found 2 days ago
Select Icelandair flight, departing Tue, Feb 10 from Washington Dulles Intl. to Keflavik Intl., returning Wed, Feb 18, priced at $487 found 2 days ago
Fri, Mar 13 - Mon, Mar 16
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$487 Roundtrip, found 5 days ago
$487
Roundtrip
found 5 days ago
Select Icelandair flight, departing Fri, Mar 13 from Washington Dulles Intl. to Keflavik Intl., returning Mon, Mar 16, priced at $487 found 5 days ago
Sat, Dec 13 - Sun, Dec 21
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$488 Roundtrip, found 2 days ago
$488
Roundtrip
found 2 days ago
Select Icelandair flight, departing Sat, Dec 13 from Washington Dulles Intl. to Keflavik Intl., returning Sun, Dec 21, priced at $488 found 2 days ago

Frequently asked questions

What route does flight number FI644 take?
Flight number FI644 takes roughly 5 hours and 55 minutes to jet non-stop from IAD to Reykjavik Airport (KEF-Keflavik Intl.). Sure, there's magic in the destination, but the journey is always half the fun!
How often is FI644 on time?
If you're flying on Icelandair flight number FI644 between Washington, DC Airport (IAD-Washington Dulles Intl.) and Reykjavík–Keflavík Airport, 90% of these journeys touch down according to schedule. If you are delayed, you're likely to wait approximately 25 minutes on average. Thanks to the air carrier's high standards, this service has a 3.8-star rating.
What kind of plane is on flight number FI644?
The route for flight number FI644 is most commonly Washington, DC Airport (IAD-Washington Dulles Intl.) to Reykjavik Airport (KEF-Keflavik Intl.), and the Boeing 767-300 is the type of aircraft you're likely to be flying on.
If I am not able to travel due to COVID-19, can I change my flight to a later date?
For more info about changing your FI644 flight with Travelocity, please visit our Customer Service Portal.