Finnair Flight 5645 Deals & Information (2026/2027)

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Finnair Flight 5645 Route Deals From $398

The cheapest prices found with in the last 7 days for return flights were $517 and $398 for one-way flights to Logan Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Wed, Jan 27 - Mon, Feb 1
MAD
Adolfo Suárez Madrid-Barajas
BOS
Logan Intl.
$517 Roundtrip, found 4 days ago
$517
Roundtrip
found 4 days ago
Select Finnair flight, departing Wed, Jan 27 from Adolfo Suárez Madrid-Barajas to Logan Intl., returning Mon, Feb 1, priced at $517 found 4 days ago
Wed, Jan 27 - Mon, Feb 1
MAD
Adolfo Suárez Madrid-Barajas
BOS
Logan Intl.
$522 Roundtrip, found 4 days ago
$522
Roundtrip
found 4 days ago
Select Finnair flight, departing Wed, Jan 27 from Adolfo Suárez Madrid-Barajas to Logan Intl., returning Mon, Feb 1, priced at $522 found 4 days ago
Thu, Nov 5 - Wed, Nov 11
MAD
Adolfo Suárez Madrid-Barajas
BOS
Logan Intl.
$528 Roundtrip, found 10 hours ago
$528
Roundtrip
found 10 hours ago
Select Finnair flight, departing Thu, Nov 5 from Adolfo Suárez Madrid-Barajas to Logan Intl., returning Wed, Nov 11, priced at $528 found 10 hours ago