Finnair Flight 5645 Deals & Information (2026/2027)

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Finnair Flight 5645 Route Deals From $406

The cheapest prices found with in the last 7 days for return flights were $620 and $406 for one-way flights to Logan Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Mon, Apr 20 - Mon, Apr 27
MAD
Adolfo Suárez Madrid-Barajas
BOS
Logan Intl.
$620 Roundtrip, found 2 days ago
$620
Roundtrip
found 2 days ago
Select Finnair flight, departing Mon, Apr 20 from Adolfo Suárez Madrid-Barajas to Logan Intl., returning Mon, Apr 27, priced at $620 found 2 days ago
Mon, Apr 20 - Mon, Apr 27
MAD
Adolfo Suárez Madrid-Barajas
BOS
Logan Intl.
$630 Roundtrip, found 2 days ago
$630
Roundtrip
found 2 days ago
Select Finnair flight, departing Mon, Apr 20 from Adolfo Suárez Madrid-Barajas to Logan Intl., returning Mon, Apr 27, priced at $630 found 2 days ago
Mon, May 4 - Mon, May 11
MAD
Adolfo Suárez Madrid-Barajas
BOS
Logan Intl.
$644 Roundtrip, found 18 hours ago
$644
Roundtrip
found 18 hours ago
Select Finnair flight, departing Mon, May 4 from Adolfo Suárez Madrid-Barajas to Logan Intl., returning Mon, May 11, priced at $644 found 18 hours ago