It was a season of highs and lows for England's record league title winners, a campaign that saw the departure of Portuguese boss, José Mourinho and the return of a bonafide United legend, Ole Gunnar Solskjær.
As the Red Devils prepare for their first full season under the Norwegian, they will face three tough fixtures against Inter, Tottenham and AC Milan as part of this summers International Champions Cup.
With three big matchups awaiting them at the ICC this summer, we look back at three of their best from the season just gone.
Cardiff City vs Man. Utd – 22 December 2018 – Premier League – Result: 1-5
As Christmas approached the North West side went through a major change, José Mourinho left the club after two years. United's Premier League form deemed not good enough to save the ex-Chelsea boss, despite his earlier Europa League and FA Cup triumphs.
A familiar face was chosen to take charge of the reins, in came Solskjær for a tie that only football can serve up - his first test would be against his last club as manager in England's top division, Cardiff City.
It was the tonic that United needed, 5-1 winners in a result that saw the Red Devils register their largest win if the season. Marcus Rashford's opener after just three minutes set the tone for an away performance to savour.
Anthony Martial netted his eighth goal of the league season on the stroke of half time to give the Manchester club an unassailable 3-1 lead going into the break, Ander Herrera had doubled the score after an assist from world cup winner, Paul Pogba.
United's second-half performance saw them add to the scoreline twice more, making it a convincing afternoon under the new boss.
A brace from Jesse Lingard took his tally to three goals in two games - watching their side hit five goals away from home the United faithful declared 'Ole's at the wheel'.
Arsenal vs Man. Utd – 25 January 2019 – FA Cup, Fourth Round – Result: 1-3
It was another excellent performance away from home, this time in the world famous FA Cup against historic rivals Arsenal, that gave an indication of United's ability under their now settled Norwegian legend.
As United prepared to travel to London, their form under Solskjær had been red hot – winning all of their seven games across two competitions.
Both sides started strong teams ahead of the game, an insight into just how seriously the competition was being taken.
Alexis Sánchez gave the visitors the lead after half an hour, the ex-Arsenal man coming back to haunt his former club before Lingard hit a second just two minutes later.
The Londoners found a response just as half time approached, Pierre-Emerick Aubameyang halved the deficit but as the break started United were very much in control of the match.
Martial came off the bench to secure the victory as he hammered home a right footed shot with eight minutes remaining.
The victory ensured United's impressive form continued as they went 11 games without defeat.
Paris Saint-Germain vs Man. Utd – 6 March 2019 – UEFA Champions League, Round of 16, Second Leg – Result: 1-3
A hat-trick of wonderful away performances culminated in a remarkable comeback in the French capital, against one of the favourites for the Champions League title.
A two-nil defeat in Manchester left an uphill struggle for qualification to the quarter-final. With two away goals conceded, some observers believed the tie was a nothing but a formality for the Parisians.
An early was needed should any pressure want to be heaped onto the hosts, and that is just what United did.
Romelu Lukaku took full advantage of the opportunity afforded to him by the Paris defence, slipping the ball past Gianluigi Buffon and into an empty net after just two minutes – the comeback was on.
The Belgian striker then tapped home a second after the half-hour mark, giving the visitors a 1-2 lead on the night and putting them within touching distance of a vital draw that would see them go through on the away goal rule.
It looked like United would just miss out on the next round, but as the clock hit 94 minutes they were awarded a penalty after a handball in the box by Presnel Kimpembe.
Marcus Rashford stepped up and dispatched the spot kick with absolute ease, firing the visitors to victory on a night when many had questioned their ability.
It was a Manchester United display that typified their progression under Solskjær - resulting in the 1999 treble winner being offered the manager's job on a full-time basis, something which he duly obliged.
United get their 2019 International Champions Cup underway against Inter at the Singapore National Stadium on July, 20th before they take on Tottenham in Shanghai on July, 25th before a final fixture against AC Milan at Cardiff's Principality Stadium on August, 3rd.