City recovered from going a goal down to qualify for their third quarter-final of the season.
Michael Johnston’s side added a last eight place in the League Cup to the identical stages reached of both the Welsh Cup and FAW Amateur Trophy.
In their first outing under new manager Aden Shannon, the visitors took a 24th minute lead when Robbie Parry was brought down in the box and got up to score from the spot.
Sam Jones equalised on 35 minutes and it was all-square at the break.
Six minutes into the second half, Bangor were in front when Ben Owen headed in a great cross from Logan Williams.
Dylan Summers-Jones scored for the third successive game in 2026 when he nodded in a Dion Donohue delivery to make it 3-1 after 69.
Top-scorer Corrig McGonigle came on as a 74th minute substitute and soon made an impact, knocking in his 23rd goal of the season when he got the final touch to send the ball across the goal-line.
Sam Jones completed the scoring with his second of the night – and 13th of the campaign – via a fine hit from distance.
CPD Dinas Bangor City 1876 v Connah’s Quay Town or Llangefni Town
Cefn Albion v Trearddur Bay
Llanuwchllyn or Llanfair United v Bow Street
Rhos Aelwyd or Knighton Town v Llay Miners Welfare
Jul 25: Mochdre Sports (h -Welsh Cup) 3-1
Jul 29: Llanrwst United (h – ANW) 5-0
Aug 1: Blue Bridge (a – Amateur Trophy) 10-0
Aug 5: CPD Y Felinheli (h – ANW) 3-1
Aug 9: Bethesda Athletic (a – ANW) 3-1
Aug 13: CPD Llannefydd (h – ANW) 2-2
Aug 16: Llay Welfare (a – ANW) 3-0
Aug 23: Conwy Borough Swifts (a – WC) 12-0
Aug 29: Connah’s Quay Town (h – ANW) 3-1
Sep 6: Broughton United (h – AT) 11-0
Sep 12: Prestatyn Town (h – ANW) 4-1
Sep 20: St Asaph City (a – WC) 6-0
Sep 27: Llanrwst United (a – Ardal North League Cup) 3-0
Oct 11: CPD Llanberis (a – AT) 3-0
Oct 18: Guilsfield (h – WC) 1-1 (won on pens)
Oct 21: Porthmadog (h – ANW) 5-1
Oct 25: St Asaph City (a – ANW) 1-0
Nov 1: CPD Y Felinheli (h – AT) 6-1
Nov 8: Penmaenmawr Phoenix (a – ANW) 3-3
Nov 22: Holywell Town (h – WC) 2-1
Nov 26: Llangefni Town (h – ANW) 4-0
Nov 29: Mynydd isa (a – ANW) 3-1
Dec 13: Trefelin BGC (h – WC) 2-0
Dec 16: Trearddur Bay (a – ANW) 2-1
Dec 20: Llanrwst United (a – AT) 3-0
Jan 3: Prestatyn Town (a-ANW) 2-0
Jan 9: Llangefni Town (a-ANW) 2-0
Jan 13: Prestatyn Town (h-Ardal North League Cup) 5-1
PLAYED 28 WON 26 DRAWN 2 LOST 0 GOALS FOR 112 GOALS AGAINST 18
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