Icelandair Flight 451 Deals & Information (2026/2027)

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Icelandair Flight 451 Route Deals From $115

The cheapest prices found with in the last 7 days for return flights were $194 and $115 for one-way flights to Keflavik Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Tue, Dec 1 - Sat, Dec 5
LHR
Heathrow
KEF
Keflavik Intl.
$194 Roundtrip, found 7 hours ago
$194
Roundtrip
found 7 hours ago
Select Icelandair flight, departing Tue, Dec 1 from Heathrow to Keflavik Intl., returning Sat, Dec 5, priced at $194 found 7 hours ago
Mon, Dec 21 - Thu, Dec 24
LHR
Heathrow
KEF
Keflavik Intl.
$195 Roundtrip, found 4 days ago
$195
Roundtrip
found 4 days ago
Select Icelandair flight, departing Mon, Dec 21 from Heathrow to Keflavik Intl., returning Thu, Dec 24, priced at $195 found 4 days ago
Mon, Dec 7 - Sat, Dec 12
LHR
Heathrow
KEF
Keflavik Intl.
$196 Roundtrip, found 2 days ago
$196
Roundtrip
found 2 days ago
Select Icelandair flight, departing Mon, Dec 7 from Heathrow to Keflavik Intl., returning Sat, Dec 12, priced at $196 found 2 days ago
Wed, Mar 24 - Mon, Mar 29
LHR
Heathrow
KEF
Keflavik Intl.
$198 Roundtrip, found 3 hours ago
$198
Roundtrip
found 3 hours ago
Select Icelandair flight, departing Wed, Mar 24 from Heathrow to Keflavik Intl., returning Mon, Mar 29, priced at $198 found 3 hours ago
Thu, Jan 21 - Mon, Jan 25
LHR
Heathrow
KEF
Keflavik Intl.
$199 Roundtrip, found 4 days ago
$199
Roundtrip
found 4 days ago
Select Icelandair flight, departing Thu, Jan 21 from Heathrow to Keflavik Intl., returning Mon, Jan 25, priced at $199 found 4 days ago
Thu, Dec 24 - Tue, Dec 29
LHR
Heathrow
KEF
Keflavik Intl.
$200 Roundtrip, found 3 days ago
$200
Roundtrip
found 3 days ago
Select Icelandair flight, departing Thu, Dec 24 from Heathrow to Keflavik Intl., returning Tue, Dec 29, priced at $200 found 3 days ago
Thu, Apr 15 - Mon, Apr 19
LHR
Heathrow
KEF
Keflavik Intl.
$202 Roundtrip, found 5 days ago
$202
Roundtrip
found 5 days ago
Select Icelandair flight, departing Thu, Apr 15 from Heathrow to Keflavik Intl., returning Mon, Apr 19, priced at $202 found 5 days ago
Fri, Jan 15 - Thu, Jan 21
LHR
Heathrow
KEF
Keflavik Intl.
$207 Roundtrip, found 4 days ago
$207
Roundtrip
found 4 days ago
Select Icelandair flight, departing Fri, Jan 15 from Heathrow to Keflavik Intl., returning Thu, Jan 21, priced at $207 found 4 days ago
Sun, Jan 10 - Mon, Jan 18
LHR
Heathrow
KEF
Keflavik Intl.
$208 Roundtrip, found 3 days ago
$208
Roundtrip
found 3 days ago
Select Icelandair flight, departing Sun, Jan 10 from Heathrow to Keflavik Intl., returning Mon, Jan 18, priced at $208 found 3 days ago
Tue, Jan 5 - Sat, Jan 9
LHR
Heathrow
KEF
Keflavik Intl.
$209 Roundtrip, found 6 days ago
$209
Roundtrip
found 6 days ago
Select Icelandair flight, departing Tue, Jan 5 from Heathrow to Keflavik Intl., returning Sat, Jan 9, priced at $209 found 6 days ago
Tue, Jan 5 - Sat, Jan 9
LHR
Heathrow
KEF
Keflavik Intl.
$215 Roundtrip, found 6 days ago
$215
Roundtrip
found 6 days ago
Select Icelandair flight, departing Tue, Jan 5 from Heathrow to Keflavik Intl., returning Sat, Jan 9, priced at $215 found 6 days ago
Tue, Dec 1 - Sat, Dec 5
LHR
Heathrow
KEF
Keflavik Intl.
$217 Roundtrip, found 7 hours ago
$217
Roundtrip
found 7 hours ago
Select Icelandair flight, departing Tue, Dec 1 from Heathrow to Keflavik Intl., returning Sat, Dec 5, priced at $217 found 7 hours ago
Fri, Jan 15 - Thu, Jan 21
LHR
Heathrow
KEF
Keflavik Intl.
$223 Roundtrip, found 4 days ago
$223
Roundtrip
found 4 days ago
Select Icelandair flight, departing Fri, Jan 15 from Heathrow to Keflavik Intl., returning Thu, Jan 21, priced at $223 found 4 days ago
Tue, Dec 1 - Sat, Dec 5
LHR
Heathrow
KEF
Keflavik Intl.
$245 Roundtrip, found 7 hours ago
$245
Roundtrip
found 7 hours ago
Select Icelandair flight, departing Tue, Dec 1 from Heathrow to Keflavik Intl., returning Sat, Dec 5, priced at $245 found 7 hours ago
Sat, Jan 9 - Mon, Jan 11
LHR
Heathrow
KEF
Keflavik Intl.
$248 Roundtrip, found 1 day ago
$248
Roundtrip
found 1 day ago
Select Icelandair flight, departing Sat, Jan 9 from Heathrow to Keflavik Intl., returning Mon, Jan 11, priced at $248 found 1 day 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.