American, Delta and Icelandair have Seattle to Frankfurt at $436 to $476 for travel October to December.
British Airways ticket prices are as low as $412 using $65 AARP discount booking link. AARP membership is currently $12 and not age restricted.
Icelandair is the lowest regular fare at $436, but fewest travel dates.
Delta low fares start at $476.
Travel dates for Frankfurt sale begin around October 22 through first week of December.
British Airways AARP ticket
$412.18 Sat Oct 28 – Sat Nov 4
Seattle SEA – London LHR – Frankfurt – London LHR – Seattle SEA
Delta Airlines
$475.96 round trip Tue Oct 24 – Sat Nov 4
Seattle SEA – Atlanta ATL – Frankfurt FRA – New York JFK – Seattle SEA
Icelandair
$435.85 round trip Mon Nov 13 – Fri Nov 24
Seattle SEA – Keflavik KEF – Frankfurt FRA – KEF – SEA
Icelandair can be ticketed with a stopover in Iceland for about $15 to $25 more.
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