Icelandair Flight 644 Deals & Information (2025/2026)

Wander Wisely with exceptional service, 24/7 supportOpens in a new window

Feel at ease with free flight cancellations within 24 hours of booking

Change your flight without a fee on select flights

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.

Mon, Dec 8 - Wed, Dec 17
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$379 Roundtrip, just found
$379
Roundtrip
just found
Select Icelandair flight, departing Mon, Dec 8 from Washington Dulles Intl. to Keflavik Intl., returning Wed, Dec 17, priced at $379 just found
Mon, Jan 12 - Wed, Jan 21
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$381 Roundtrip, found 5 days ago
$381
Roundtrip
found 5 days ago
Select Icelandair flight, departing Mon, Jan 12 from Washington Dulles Intl. to Keflavik Intl., returning Wed, Jan 21, priced at $381 found 5 days ago
Wed, Jan 7 - Thu, Jan 15
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$381 Roundtrip, found 6 days ago
$381
Roundtrip
found 6 days ago
Select Icelandair flight, departing Wed, Jan 7 from Washington Dulles Intl. to Keflavik Intl., returning Thu, Jan 15, priced at $381 found 6 days ago
Tue, Apr 21 - Sat, Apr 25
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$399 Roundtrip, just found
$399
Roundtrip
just found
Select Icelandair flight, departing Tue, Apr 21 from Washington Dulles Intl. to Keflavik Intl., returning Sat, Apr 25, priced at $399 just found
Tue, Jan 13 - Sat, Jan 17
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$401 Roundtrip, found 5 days ago
$401
Roundtrip
found 5 days ago
Select Icelandair flight, departing Tue, Jan 13 from Washington Dulles Intl. to Keflavik Intl., returning Sat, Jan 17, priced at $401 found 5 days ago
Wed, Apr 1 - Sat, Apr 11
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$419 Roundtrip, just found
$419
Roundtrip
just found
Select Icelandair flight, departing Wed, Apr 1 from Washington Dulles Intl. to Keflavik Intl., returning Sat, Apr 11, priced at $419 just found
Thu, Jan 8 - Sat, Jan 24
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$422 Roundtrip, found 6 days ago
$422
Roundtrip
found 6 days ago
Select Icelandair flight, departing Thu, Jan 8 from Washington Dulles Intl. to Keflavik Intl., returning Sat, Jan 24, priced at $422 found 6 days ago
Mon, Dec 15 - Tue, Dec 23
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$422 Roundtrip, found 4 days ago
$422
Roundtrip
found 4 days ago
Select Icelandair flight, departing Mon, Dec 15 from Washington Dulles Intl. to Keflavik Intl., returning Tue, Dec 23, priced at $422 found 4 days ago
Wed, Dec 10 - Mon, Dec 15
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$442 Roundtrip, found 9 hours ago
$442
Roundtrip
found 9 hours ago
Select Icelandair flight, departing Wed, Dec 10 from Washington Dulles Intl. to Keflavik Intl., returning Mon, Dec 15, priced at $442 found 9 hours ago
Fri, Feb 13 - Mon, Feb 16
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$444 Roundtrip, just found
$444
Roundtrip
just found
Select Icelandair flight, departing Fri, Feb 13 from Washington Dulles Intl. to Keflavik Intl., returning Mon, Feb 16, priced at $444 just found
Fri, Jan 16 - Sat, Jan 24
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$464 Roundtrip, just found
$464
Roundtrip
just found
Select Icelandair flight, departing Fri, Jan 16 from Washington Dulles Intl. to Keflavik Intl., returning Sat, Jan 24, priced at $464 just found
Tue, Feb 24 - Sun, Mar 1
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$467 Roundtrip, found 2 hours ago
$467
Roundtrip
found 2 hours ago
Select Icelandair flight, departing Tue, Feb 24 from Washington Dulles Intl. to Keflavik Intl., returning Sun, Mar 1, priced at $467 found 2 hours ago
Tue, Dec 30 - Mon, Feb 23
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$477 Roundtrip, found 8 hours ago
$477
Roundtrip
found 8 hours ago
Select Icelandair flight, departing Tue, Dec 30 from Washington Dulles Intl. to Keflavik Intl., returning Mon, Feb 23, priced at $477 found 8 hours ago
Mon, Dec 15 - Thu, Dec 25
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$477 Roundtrip, found 4 days ago
$477
Roundtrip
found 4 days ago
Select Icelandair flight, departing Mon, Dec 15 from Washington Dulles Intl. to Keflavik Intl., returning Thu, Dec 25, priced at $477 found 4 days ago
Wed, Apr 29 - Tue, May 5
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$479 Roundtrip, found 1 day ago
$479
Roundtrip
found 1 day ago
Select Icelandair flight, departing Wed, Apr 29 from Washington Dulles Intl. to Keflavik Intl., returning Tue, May 5, priced at $479 found 1 day ago
Thu, Jan 15 - Sun, Jan 18
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$487 Roundtrip, just found
$487
Roundtrip
just found
Select Icelandair flight, departing Thu, Jan 15 from Washington Dulles Intl. to Keflavik Intl., returning Sun, Jan 18, priced at $487 just found
Thu, Mar 12 - Fri, Mar 20
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$487 Roundtrip, found 4 days ago
$487
Roundtrip
found 4 days ago
Select Icelandair flight, departing Thu, Mar 12 from Washington Dulles Intl. to Keflavik Intl., returning Fri, Mar 20, priced at $487 found 4 days ago
Tue, Apr 28 - Wed, May 6
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$490 Roundtrip, found 3 days ago
$490
Roundtrip
found 3 days ago
Select Icelandair flight, departing Tue, Apr 28 from Washington Dulles Intl. to Keflavik Intl., returning Wed, May 6, priced at $490 found 3 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.