*A - EWR > MAD - $272 USD return
Spotted on Google flights:
https://www.google.com/flights?lite=0#flt=/m/02_286./m/056_y.2020-03-19.EWRYYZ0AC7653~YYZMAD0AC836*/m/056_y./m/02_286.2020-03-26.MADEWR0UA50;c:CAD;e:1;sd:1;t:b;sp:2.CAD.37193*2 .CAD.37193
Good availability throughout this year and next. Tickets are booked into Economy Basic which only earn 50% PQM on UA (cannot comment on other * partners). However, for this deal you have a number of *A partners to choose from including UA, AC and LX. Upgrading the fare to normal economy will cost you another $150 USD more which for many may not be worth it since you're only getting extra miles out of the upgrade if you're already an elite (i.e. E+ seating is free on UA even in Economy Basic if you book the ticket in a certain way).
Safe Travels,
James