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, Oct 26 - Fri, Oct 31
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$379 Roundtrip, found 5 hours ago
$379
Roundtrip
found 5 hours ago
Select Icelandair flight, departing Sun, Oct 26 from Washington Dulles Intl. to Keflavik Intl., returning Fri, Oct 31, priced at $379 found 5 hours ago
Tue, Aug 19 - Tue, Aug 26
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$391 Roundtrip, found 1 day ago
$391
Roundtrip
found 1 day ago
Select Icelandair flight, departing Tue, Aug 19 from Washington Dulles Intl. to Keflavik Intl., returning Tue, Aug 26, priced at $391 found 1 day ago
Fri, Oct 31 - Tue, Nov 4
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$398 Roundtrip, found 2 days ago
$398
Roundtrip
found 2 days ago
Select Icelandair flight, departing Fri, Oct 31 from Washington Dulles Intl. to Keflavik Intl., returning Tue, Nov 4, priced at $398 found 2 days ago
Sat, Aug 30 - Fri, Sep 5
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$411 Roundtrip, found 5 hours ago
$411
Roundtrip
found 5 hours ago
Select Icelandair flight, departing Sat, Aug 30 from Washington Dulles Intl. to Keflavik Intl., returning Fri, Sep 5, priced at $411 found 5 hours ago
Thu, Sep 18 - Sun, Sep 21
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$434 Roundtrip, found 9 hours ago
$434
Roundtrip
found 9 hours ago
Select Icelandair flight, departing Thu, Sep 18 from Washington Dulles Intl. to Keflavik Intl., returning Sun, Sep 21, priced at $434 found 9 hours ago
Fri, Sep 26 - Sun, Oct 5
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$442 Roundtrip, found 9 hours ago
$442
Roundtrip
found 9 hours ago
Select Icelandair flight, departing Fri, Sep 26 from Washington Dulles Intl. to Keflavik Intl., returning Sun, Oct 5, priced at $442 found 9 hours ago
Tue, Oct 7 - Sat, Oct 11
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$443 Roundtrip, found 2 days ago
$443
Roundtrip
found 2 days ago
Select Icelandair flight, departing Tue, Oct 7 from Washington Dulles Intl. to Keflavik Intl., returning Sat, Oct 11, priced at $443 found 2 days ago
Sun, Aug 17 - Mon, Aug 25
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$451 Roundtrip, found 1 day ago
$451
Roundtrip
found 1 day ago
Select Icelandair flight, departing Sun, Aug 17 from Washington Dulles Intl. to Keflavik Intl., returning Mon, Aug 25, priced at $451 found 1 day ago
Thu, Sep 18 - Sat, Sep 27
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$454 Roundtrip, found 9 hours ago
$454
Roundtrip
found 9 hours ago
Select Icelandair flight, departing Thu, Sep 18 from Washington Dulles Intl. to Keflavik Intl., returning Sat, Sep 27, priced at $454 found 9 hours ago
Sat, Sep 6 - Sat, Sep 20
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$456 Roundtrip, found 1 day ago
$456
Roundtrip
found 1 day ago
Select Icelandair flight, departing Sat, Sep 6 from Washington Dulles Intl. to Keflavik Intl., returning Sat, Sep 20, priced at $456 found 1 day ago
Fri, Oct 10 - Wed, Oct 15
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$464 Roundtrip, found 14 hours ago
$464
Roundtrip
found 14 hours ago
Select Icelandair flight, departing Fri, Oct 10 from Washington Dulles Intl. to Keflavik Intl., returning Wed, Oct 15, priced at $464 found 14 hours ago
Tue, Nov 11 - Sun, Nov 16
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$467 Roundtrip, found 1 day ago
$467
Roundtrip
found 1 day ago
Select Icelandair flight, departing Tue, Nov 11 from Washington Dulles Intl. to Keflavik Intl., returning Sun, Nov 16, priced at $467 found 1 day ago
Sat, Aug 16 - Fri, Aug 22
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$471 Roundtrip, found 1 day ago
$471
Roundtrip
found 1 day ago
Select Icelandair flight, departing Sat, Aug 16 from Washington Dulles Intl. to Keflavik Intl., returning Fri, Aug 22, priced at $471 found 1 day ago
Fri, Sep 19 - Sat, Sep 27
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$476 Roundtrip, found 9 hours ago
$476
Roundtrip
found 9 hours ago
Select Icelandair flight, departing Fri, Sep 19 from Washington Dulles Intl. to Keflavik Intl., returning Sat, Sep 27, priced at $476 found 9 hours ago
Sat, Mar 21 - Sat, Mar 28
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$487 Roundtrip, found 10 hours ago
$487
Roundtrip
found 10 hours ago
Select Icelandair flight, departing Sat, Mar 21 from Washington Dulles Intl. to Keflavik Intl., returning Sat, Mar 28, priced at $487 found 10 hours ago
Thu, Aug 21 - Thu, Aug 28
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$500 Roundtrip, just found
$500
Roundtrip
just found
Select Icelandair flight, departing Thu, Aug 21 from Washington Dulles Intl. to Keflavik Intl., returning Thu, Aug 28, priced at $500 just found

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.