FWIW, these are ongoing seasonal coach awards that are available from a number of major US markets (such as CHI, NYC, WAS, BOS, LAX, etc) to EU markets where DL has non-stop service from the US (such as BCN, MAD, etc.). The award levels differ somewhat between markets, but the seasonality requirements are the same. They also have 14-day advance purchase requirements, roundtrip booking (not available as one-ways) with Saturday night stay requirement, and midweek travel for cheapest award levels (see below for day/time and seasonality requirements which are available at Fare Rules link for the awards).



The lowest level on ORD-BCN is actually 50K miles roundtrip. It's the same 50K RT for WAS-BCN. NYC-BCN starts at 52K miles roundtrip and BOS-BCN at 56K miles roundtrip.



Note that it is easier to find lowest level awards if you use the "Price Calendar" view instead of the default "Flexible Dates". You can only switch to Price Calendar after starting search. It's a clickable link at top of search which people don't always seem to realize.