A late goal from Gary Hooper secured Scunthorpe's ticket to the Johnstone's Paint Trophy final at Wembley as they beat Rotherham 1-0 on the night, 3-0 on aggregate.
The Iron's leading scorer swooped 17 minutes from time to secure victory in the Northern area final second leg at the expense of the battling Millers at Don Valley Stadium.
Scunthorpe always looked the likelier side and should have been home and dry by half-time as Hooper had a close-range shot blocked and Garry Thompson saw his effort from the rebound deflected over.
Martyn Woolford screwed a good chance wide from 10 yards in the first half and also hit the bar in the second half as Scunthorpe stayed in control.
Rotherham's best chance fell to Reuben Reid, who had a header tipped onto the crossbar by goalkeeper Joe Murphy soon after half-time.
However the contest was settled when Hooper latched on to a through-ball before finishing coolly past Andy Warrington in the home goal.
Scunthorpe will meet Luton in the final after Lewis Price was the star for the Hatters as his penalty heroics saw off 10-man Brighton.
Price saved superbly from Chris Birchall and Jason Jarrett to secure a 4-3 victory in the shoot-out after the two teams were locked together at 1-1 following the second leg of the Southern Area final at Kenilworth Road.
Mick Harford's men made a dream start to the clash with Tom Craddock taking full advantage of Michel Kuipers' confusion with his defence to slot into an empty net.
But the Seagulls were back on terms in the 20th minute when Nicky Forster burst through the middle to fire home.
Micky Adams' League One side were reduced to 10 men just before the interval when David Livermore was shown a straight red card by referee Andy D'Urso after his challenge on Michael Spillane.
Chris Martin, Craddock, Asa Hall and Ryan Charles all converted from 12 yards at the end of 90 minutes, but it was Price who took the deserved accolades for his two saves.
Luton, who started the campaign with a 30-point deduction and remain well adrift of safety in League Two, could now become the first-ever side to reach a Wembley final and suffer relegation from the Football League in the same season.