After 14 matches that have taken Jose Mourinho's men to Holland, Turkey, Ukraine, France, Russia, Belgium and Spain, the long, arduous continental campaign has brought a shot at glory.
Reaching the May 24 finale was far from straightforward, though, as Marouane Fellaini's first-half header was cancelled out by Facundo Roncaglia five minutes from the end of the semi-final second leg.
The drama did not end there as Celta's goalscorer and Eric Bailly were sent off as tempers frayed, with United holding out for a 1-1 draw that saw them reach the Stockholm finale 2-1 on aggregate.
The relief was as clear as the joy at the final whistle as United moved within a victory of the only major trophy to have eluded them in their success-laden history.
Europa League glory also offers Champions League qualification - United's best chance of returning to Europe's top table given their Premier League struggles - but Ajax are likely to prove as stern a test as Celta.
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Additional reporting by PAReuse content