[19] During the rest of Stewart's tenure the club reached the final of the Challenge Cup in 2003 (losing 2–0 to Inverness Caledonian Thistle),[20] and won the Second Division title in 2003–04 season.

[21] Having started poorly Airdrie went on a run that saw them unbeaten in the last 18 games of that season,[22][23] including the final game of the league campaign which saw a crowd of over 5,700 at New Broomfield to watch Airdrie defeat Morton 2–0 and lift the League Championship trophy,[24] the club having been confirmed champions the previous week following their 1–0 victory away to Alloa Athletic at Recreation Park.

[22] In November 2006, Stewart was sacked[25] and replaced by former Airdrieonians player and Airdrie United coach Kenny Black, his first management post.

[45] In June 2015 Jim Ballantyne sold control of the club to Tom Wotherspoon, a Lanarkshire businessman and owner of M & H Logistics (who had previously sponsored Hamilton Academical, East Fife and BSC Glasgow).

The majority of the previous board was replaced, including Jim Ballantyne, and subsequently Director of Football Gordon Dalziel (appointed October 2016) departed.

With Rhys McCabe subsequently appointed as player manager, Airdrie finished the 2022–23 season in third place, defeating Falkirk 7–2 on aggregate in the play-off semi-final and Hamilton Academical 6–5 on penalties after extra time in the Championship play-off final at New Douglas Park in May 2023, therefore relegating Hamilton to League One and earning Airdrie a place in the Scottish Championship.

Following a defeat of Premiership side St. Johnstone, Airdrie reached the fifth round of the Scottish Cup for the first time in over 10 years, but lost to Hearts 4–1.

In March 2024, Airdrie reached the final of the Scottish Challenge Cup, and defeated Welsh side The New Saints at Falkirk Stadium 2–1 through goals from Liam McStravick and Nikolay Todorov to lift the trophy for the first time since 2008.

The ground was built when now defunct Airdrieonians' previous home, Broomfield Park, was sold to supermarket chain Safeway, who were given permission to build a new store on the site.

[citation needed] This transaction has been cited as being the cause of the financial ruination of the club, as their old ground was demolished several years before they acquired planning permission for the new stadium.

[56][57] Airdrie United inherited Airdrieonians' distinctive playing colours of a white shirt with a red diamond.

[58] When the club inherited the Airdrieonians name in 2013, they also restored the badge worn by their predecessors:[58] the original AFC bore this emblem from 1974 until their demise in 2002, excepting the 2000–01 season.

[60] On 19 June 2015, Airdrieonians unveiled a new crest, removing the shield and instead using a chevron–representing the "Airdrie Diamond"–to separate the scroll from the remainder of the badge.

[61] Note: Flags indicate national team as defined under FIFA eligibility rules; some limited exceptions apply.