Icelandair Flight FI644 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 $329 and $410 for one-way flights to Keflavik Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Mon, Sep 22 - Wed, Oct 1
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$329 Roundtrip, just found
$329
Roundtrip
just found
Select Icelandair flight, departing Mon, Sep 22 from Washington Dulles Intl. to Keflavik Intl., returning Wed, Oct 1, priced at $329 just found
Mon, Sep 22 - Fri, Sep 26
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$342 Roundtrip, just found
$342
Roundtrip
just found
Select Icelandair flight, departing Mon, Sep 22 from Washington Dulles Intl. to Keflavik Intl., returning Fri, Sep 26, priced at $342 just found
Fri, Jan 16 - Wed, Jan 21
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$357 Roundtrip, just found
$357
Roundtrip
just found
Select Icelandair flight, departing Fri, Jan 16 from Washington Dulles Intl. to Keflavik Intl., returning Wed, Jan 21, priced at $357 just found
Sat, Sep 13 - Sat, Oct 4
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$379 Roundtrip, found 22 hours ago
$379
Roundtrip
found 22 hours ago
Select Icelandair flight, departing Sat, Sep 13 from Washington Dulles Intl. to Keflavik Intl., returning Sat, Oct 4, priced at $379 found 22 hours ago
Wed, Jan 7 - Sun, Jan 11
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$385 Roundtrip, just found
$385
Roundtrip
just found
Select Icelandair flight, departing Wed, Jan 7 from Washington Dulles Intl. to Keflavik Intl., returning Sun, Jan 11, priced at $385 just found
Sun, Sep 14 - Fri, Sep 19
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$391 Roundtrip, found 1 day ago
$391
Roundtrip
found 1 day ago
Select Icelandair flight, departing Sun, Sep 14 from Washington Dulles Intl. to Keflavik Intl., returning Fri, Sep 19, priced at $391 found 1 day ago
Mon, Mar 16 - Mon, Mar 23
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$396 Roundtrip, found 5 hours ago
$396
Roundtrip
found 5 hours ago
Select Icelandair flight, departing Mon, Mar 16 from Washington Dulles Intl. to Keflavik Intl., returning Mon, Mar 23, priced at $396 found 5 hours ago
Mon, Sep 15 - Sun, Sep 21
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$398 Roundtrip, found 4 hours ago
$398
Roundtrip
found 4 hours ago
Select Icelandair flight, departing Mon, Sep 15 from Washington Dulles Intl. to Keflavik Intl., returning Sun, Sep 21, priced at $398 found 4 hours ago
Wed, Sep 10 - Fri, Sep 19
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$411 Roundtrip, found 6 hours ago
$411
Roundtrip
found 6 hours ago
Select Icelandair flight, departing Wed, Sep 10 from Washington Dulles Intl. to Keflavik Intl., returning Fri, Sep 19, priced at $411 found 6 hours ago
Thu, Jan 15 - Tue, Jan 20
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$413 Roundtrip, found 2 hours ago
$413
Roundtrip
found 2 hours ago
Select Icelandair flight, departing Thu, Jan 15 from Washington Dulles Intl. to Keflavik Intl., returning Tue, Jan 20, priced at $413 found 2 hours ago
Mon, Mar 16 - Tue, Mar 24
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$419 Roundtrip, found 1 day ago
$419
Roundtrip
found 1 day ago
Select Icelandair flight, departing Mon, Mar 16 from Washington Dulles Intl. to Keflavik Intl., returning Tue, Mar 24, priced at $419 found 1 day ago
Sun, Sep 14 - Sun, Sep 21
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$434 Roundtrip, found 1 day ago
$434
Roundtrip
found 1 day ago
Select Icelandair flight, departing Sun, Sep 14 from Washington Dulles Intl. to Keflavik Intl., returning Sun, Sep 21, priced at $434 found 1 day ago
Fri, Mar 13 - Tue, Mar 17
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$441 Roundtrip, found 6 hours ago
$441
Roundtrip
found 6 hours ago
Select Icelandair flight, departing Fri, Mar 13 from Washington Dulles Intl. to Keflavik Intl., returning Tue, Mar 17, priced at $441 found 6 hours ago
Fri, Jan 2 - Tue, Jan 6
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$451 Roundtrip, found 8 hours ago
$451
Roundtrip
found 8 hours ago
Select Icelandair flight, departing Fri, Jan 2 from Washington Dulles Intl. to Keflavik Intl., returning Tue, Jan 6, priced at $451 found 8 hours ago
Thu, Mar 5 - Mon, Mar 23
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$452 Roundtrip, found 2 days ago
$452
Roundtrip
found 2 days ago
Select Icelandair flight, departing Thu, Mar 5 from Washington Dulles Intl. to Keflavik Intl., returning Mon, Mar 23, priced at $452 found 2 days ago
Wed, Sep 10 - Sun, Sep 21
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$454 Roundtrip, found 3 days ago
$454
Roundtrip
found 3 days ago
Select Icelandair flight, departing Wed, Sep 10 from Washington Dulles Intl. to Keflavik Intl., returning Sun, Sep 21, priced at $454 found 3 days ago
Sun, Nov 23 - Thu, Dec 4
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$461 Roundtrip, found 1 day ago
$461
Roundtrip
found 1 day ago
Select Icelandair flight, departing Sun, Nov 23 from Washington Dulles Intl. to Keflavik Intl., returning Thu, Dec 4, priced at $461 found 1 day ago
Sat, Mar 21 - Mon, Mar 30
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$463 Roundtrip, found 3 days ago
$463
Roundtrip
found 3 days ago
Select Icelandair flight, departing Sat, Mar 21 from Washington Dulles Intl. to Keflavik Intl., returning Mon, Mar 30, priced at $463 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.