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 $196 and $116 for one-way flights to Keflavik Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Fri, Dec 4 - Sun, Dec 6
LHR
Heathrow
KEF
Keflavik Intl.
$196 Roundtrip, found 2 days ago
$196
Roundtrip
found 2 days ago
Select Icelandair flight, departing Fri, Dec 4 from Heathrow to Keflavik Intl., returning Sun, Dec 6, priced at $196 found 2 days ago
Tue, Dec 1 - Sun, Dec 6
LHR
Heathrow
KEF
Keflavik Intl.
$200 Roundtrip, found 2 days ago
$200
Roundtrip
found 2 days ago
Select Icelandair flight, departing Tue, Dec 1 from Heathrow to Keflavik Intl., returning Sun, Dec 6, priced at $200 found 2 days ago
Wed, Apr 14 - Sun, Apr 18
LHR
Heathrow
KEF
Keflavik Intl.
$201 Roundtrip, found 1 day ago
$201
Roundtrip
found 1 day ago
Select Icelandair flight, departing Wed, Apr 14 from Heathrow to Keflavik Intl., returning Sun, Apr 18, priced at $201 found 1 day ago
Fri, Nov 20 - Fri, Nov 27
LHR
Heathrow
KEF
Keflavik Intl.
$204 Roundtrip, found 6 hours ago
$204
Roundtrip
found 6 hours ago
Select Icelandair flight, departing Fri, Nov 20 from Heathrow to Keflavik Intl., returning Fri, Nov 27, priced at $204 found 6 hours ago
Sun, Dec 20 - Thu, Dec 24
LHR
Heathrow
KEF
Keflavik Intl.
$213 Roundtrip, found 3 days ago
$213
Roundtrip
found 3 days ago
Select Icelandair flight, departing Sun, Dec 20 from Heathrow to Keflavik Intl., returning Thu, Dec 24, priced at $213 found 3 days ago
Tue, Nov 17 - Fri, Nov 20
LHR
Heathrow
KEF
Keflavik Intl.
$220 Roundtrip, found 1 day ago
$220
Roundtrip
found 1 day ago
Select Icelandair flight, departing Tue, Nov 17 from Heathrow to Keflavik Intl., returning Fri, Nov 20, priced at $220 found 1 day ago
Fri, Jan 15 - Sat, Jan 23
LHR
Heathrow
KEF
Keflavik Intl.
$222 Roundtrip, found 1 hour ago
$222
Roundtrip
found 1 hour ago
Select Icelandair flight, departing Fri, Jan 15 from Heathrow to Keflavik Intl., returning Sat, Jan 23, priced at $222 found 1 hour ago
Tue, Jan 12 - Sat, Jan 16
LHR
Heathrow
KEF
Keflavik Intl.
$224 Roundtrip, found 2 days ago
$224
Roundtrip
found 2 days ago
Select Icelandair flight, departing Tue, Jan 12 from Heathrow to Keflavik Intl., returning Sat, Jan 16, priced at $224 found 2 days ago
Wed, Nov 11 - Sun, Nov 15
LHR
Heathrow
KEF
Keflavik Intl.
$231 Roundtrip, found 7 hours ago
$231
Roundtrip
found 7 hours ago
Select Icelandair flight, departing Wed, Nov 11 from Heathrow to Keflavik Intl., returning Sun, Nov 15, priced at $231 found 7 hours ago
Sun, Jan 17 - Thu, Jan 21
LHR
Heathrow
KEF
Keflavik Intl.
$233 Roundtrip, found 3 days ago
$233
Roundtrip
found 3 days ago
Select Icelandair flight, departing Sun, Jan 17 from Heathrow to Keflavik Intl., returning Thu, Jan 21, priced at $233 found 3 days 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.