Icelandair Flight FI645 Deals & Information (2025/2026)

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Icelandair Flight 645 Route Deals From $433

The cheapest prices found with in the last 7 days for return flights were $530 and $433 for one-way flights to Washington Dulles Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Tue, Nov 11 - Tue, Nov 18
KEF
Keflavik Intl.
IAD
Washington Dulles Intl.
$530 Roundtrip, found 3 days ago
$530
Roundtrip
found 3 days ago
Select Icelandair flight, departing Tue, Nov 11 from Keflavik Intl. to Washington Dulles Intl., returning Tue, Nov 18, priced at $530 found 3 days ago
Sun, Nov 30 - Sat, Dec 6
KEF
Keflavik Intl.
IAD
Washington Dulles Intl.
$541 Roundtrip, found 4 days ago
$541
Roundtrip
found 4 days ago
Select Icelandair flight, departing Sun, Nov 30 from Keflavik Intl. to Washington Dulles Intl., returning Sat, Dec 6, priced at $541 found 4 days ago
Fri, Oct 17 - Tue, Oct 21
KEF
Keflavik Intl.
IAD
Washington Dulles Intl.
$541 Roundtrip, found 2 days ago
$541
Roundtrip
found 2 days ago
Select Icelandair flight, departing Fri, Oct 17 from Keflavik Intl. to Washington Dulles Intl., returning Tue, Oct 21, priced at $541 found 2 days ago
Sat, Sep 27 - Thu, Oct 9
KEF
Keflavik Intl.
IAD
Washington Dulles Intl.
$547 Roundtrip, found 6 days ago
$547
Roundtrip
found 6 days ago
Select Icelandair flight, departing Sat, Sep 27 from Keflavik Intl. to Washington Dulles Intl., returning Thu, Oct 9, priced at $547 found 6 days ago
Fri, Aug 15 - Tue, Aug 19
KEF
Keflavik Intl.
IAD
Washington Dulles Intl.
$553 Roundtrip, found 5 days ago
$553
Roundtrip
found 5 days ago
Select Icelandair flight, departing Fri, Aug 15 from Keflavik Intl. to Washington Dulles Intl., returning Tue, Aug 19, priced at $553 found 5 days ago
Wed, Aug 13 - Sun, Aug 17
KEF
Keflavik Intl.
IAD
Washington Dulles Intl.
$553 Roundtrip, found 6 days ago
$553
Roundtrip
found 6 days ago
Select Icelandair flight, departing Wed, Aug 13 from Keflavik Intl. to Washington Dulles Intl., returning Sun, Aug 17, priced at $553 found 6 days ago
Thu, Jul 24 - Wed, Aug 13
KEF
Keflavik Intl.
IAD
Washington Dulles Intl.
$555 Roundtrip, found 6 days ago
$555
Roundtrip
found 6 days ago
Select Icelandair flight, departing Thu, Jul 24 from Keflavik Intl. to Washington Dulles Intl., returning Wed, Aug 13, priced at $555 found 6 days ago
Mon, Jul 7 - Tue, Jul 22
KEF
Keflavik Intl.
IAD
Washington Dulles Intl.
$557 Roundtrip, found 6 days ago
$557
Roundtrip
found 6 days ago
Select Icelandair flight, departing Mon, Jul 7 from Keflavik Intl. to Washington Dulles Intl., returning Tue, Jul 22, priced at $557 found 6 days ago
Thu, Nov 27 - Thu, Jan 1
KEF
Keflavik Intl.
IAD
Washington Dulles Intl.
$562 Roundtrip, found 12 hours ago
$562
Roundtrip
found 12 hours ago
Select Icelandair flight, departing Thu, Nov 27 from Keflavik Intl. to Washington Dulles Intl., returning Thu, Jan 1, priced at $562 found 12 hours ago
Mon, Sep 1 - Sat, Sep 6
KEF
Keflavik Intl.
IAD
Washington Dulles Intl.
$563 Roundtrip, just found
$563
Roundtrip
just found
Select Icelandair flight, departing Mon, Sep 1 from Keflavik Intl. to Washington Dulles Intl., returning Sat, Sep 6, priced at $563 just found

Frequently asked questions

What route does flight number FI645 take?
Flight number FI645 flies non-stop from Reykjavik Airport (KEF-Keflavik Intl.) to Washington, DC Airport (IAD-Washington Dulles Intl.). During this journey, you can expect to be in the air for 6 hours and 20 minutes. Book ahead to get your preferred seat.
What kind of plane is on flight number FI645?
The route for flight number FI645 is almost always KEF to Washington, DC Airport (IAD-Washington Dulles Intl.), and the Boeing 767-300 is the type of aircraft you’ll probably 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 FI645 flight with Travelocity, please visit our Customer Service Portal.