Icelandair Flight 451 Deals & Information (2026/2027)

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Icelandair Flight 451 Route Deals From $116

The cheapest prices found with in the last 7 days for return flights were $248 and $116 for one-way flights to Keflavik Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Sat, Nov 28 - Fri, Dec 4
LHR
Heathrow
KEF
Keflavik Intl.
$248 Roundtrip, found 1 day ago
$248
Roundtrip
found 1 day ago
Select Icelandair flight, departing Sat, Nov 28 from Heathrow to Keflavik Intl., returning Fri, Dec 4, priced at $248 found 1 day ago
Fri, Nov 27 - Thu, Dec 3
LHR
Heathrow
KEF
Keflavik Intl.
$251 Roundtrip, found 1 day ago
$251
Roundtrip
found 1 day ago
Select Icelandair flight, departing Fri, Nov 27 from Heathrow to Keflavik Intl., returning Thu, Dec 3, priced at $251 found 1 day ago
Thu, Nov 12 - Wed, Nov 18
LHR
Heathrow
KEF
Keflavik Intl.
$252 Roundtrip, found 3 days ago
$252
Roundtrip
found 3 days ago
Select Icelandair flight, departing Thu, Nov 12 from Heathrow to Keflavik Intl., returning Wed, Nov 18, priced at $252 found 3 days ago
Sun, Nov 22 - Tue, Nov 24
LHR
Heathrow
KEF
Keflavik Intl.
$258 Roundtrip, found 2 days ago
$258
Roundtrip
found 2 days ago
Select Icelandair flight, departing Sun, Nov 22 from Heathrow to Keflavik Intl., returning Tue, Nov 24, priced at $258 found 2 days ago
Fri, Nov 20 - Sun, Nov 22
LHR
Heathrow
KEF
Keflavik Intl.
$263 Roundtrip, found 2 days ago
$263
Roundtrip
found 2 days ago
Select Icelandair flight, departing Fri, Nov 20 from Heathrow to Keflavik Intl., returning Sun, Nov 22, priced at $263 found 2 days ago
Sat, Nov 28 - Fri, Dec 4
LHR
Heathrow
KEF
Keflavik Intl.
$267 Roundtrip, found 1 day ago
$267
Roundtrip
found 1 day ago
Select Icelandair flight, departing Sat, Nov 28 from Heathrow to Keflavik Intl., returning Fri, Dec 4, priced at $267 found 1 day ago
Fri, Nov 6 - Thu, Nov 12
LHR
Heathrow
KEF
Keflavik Intl.
$269 Roundtrip, found 4 days ago
$269
Roundtrip
found 4 days ago
Select Icelandair flight, departing Fri, Nov 6 from Heathrow to Keflavik Intl., returning Thu, Nov 12, priced at $269 found 4 days ago
Thu, Nov 12 - Wed, Nov 18
LHR
Heathrow
KEF
Keflavik Intl.
$284 Roundtrip, found 3 days ago
$284
Roundtrip
found 3 days ago
Select Icelandair flight, departing Thu, Nov 12 from Heathrow to Keflavik Intl., returning Wed, Nov 18, priced at $284 found 3 days ago
Fri, Nov 27 - Thu, Dec 3
LHR
Heathrow
KEF
Keflavik Intl.
$290 Roundtrip, found 1 day ago
$290
Roundtrip
found 1 day ago
Select Icelandair flight, departing Fri, Nov 27 from Heathrow to Keflavik Intl., returning Thu, Dec 3, priced at $290 found 1 day ago
Thu, Nov 12 - Wed, Nov 18
LHR
Heathrow
KEF
Keflavik Intl.
$292 Roundtrip, found 3 days ago
$292
Roundtrip
found 3 days ago
Select Icelandair flight, departing Thu, Nov 12 from Heathrow to Keflavik Intl., returning Wed, Nov 18, priced at $292 found 3 days ago
Thu, Nov 12 - Thu, Nov 19
LHR
Heathrow
KEF
Keflavik Intl.
$293 Roundtrip, found 3 days ago
$293
Roundtrip
found 3 days ago
Select Icelandair flight, departing Thu, Nov 12 from Heathrow to Keflavik Intl., returning Thu, Nov 19, priced at $293 found 3 days ago
Sat, Oct 10 - Thu, Oct 15
LHR
Heathrow
KEF
Keflavik Intl.
$298 Roundtrip, found 1 day ago
$298
Roundtrip
found 1 day ago
Select Icelandair flight, departing Sat, Oct 10 from Heathrow to Keflavik Intl., returning Thu, Oct 15, priced at $298 found 1 day ago
Mon, Sep 7 - Fri, Sep 11
LHR
Heathrow
KEF
Keflavik Intl.
$312 Roundtrip, found 2 hours ago
$312
Roundtrip
found 2 hours ago
Select Icelandair flight, departing Mon, Sep 7 from Heathrow to Keflavik Intl., returning Fri, Sep 11, priced at $312 found 2 hours ago
Sat, Dec 19 - Mon, Dec 21
LHR
Heathrow
KEF
Keflavik Intl.
$318 Roundtrip, found 17 hours ago
$318
Roundtrip
found 17 hours ago
Select Icelandair flight, departing Sat, Dec 19 from Heathrow to Keflavik Intl., returning Mon, Dec 21, priced at $318 found 17 hours ago

Frequently asked questions

What route does flight number FI451 take?
FI451 takes 3 hours and 10 minutes to jet directly from Heathrow Airport (LHR) to Reykjavik Airport (KEF-Keflavik Intl.). We all know there's magic in the destination, but getting there is half the fun!
How often is FI451 on time?
Icelandair flight number FI451 between Heathrow Airport (LHR) and Keflavik Intl. Airport (KEF) lands on schedule 100% of the time — so you can rest easy knowing you'll arrive at your destination ASAP. If this trip happens to be delayed, you'll probably wait 4 minutes. This route has a star rating of 4.15.
What terminal does FI451 fly out of?
Direct flights to and from London Airport (LHR-Heathrow) and Keflavik Intl. Airport (KEF) are served by flight number FI451, and passengers booked on this route usually jet off from Terminal 2.
What kind of plane is on flight number FI451?
Prepare to board a Boeing 757-200 if your flight number is FI451. Nearly all services from Heathrow Airport (LHR) to Reykjavik Airport (KEF-Keflavik Intl.) operate using this kind of plane.
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 FI451 flight with Travelocity, please visit our Customer Service Portal.