They will fly out on Sunday July 17, and play a friendly against Limerick the following evening.
And on Thursday July 21 they will play against Kilkenny, before returning to North Lincolnshire on Saturday 23.
Iron chairman Steve Wharton has previously suggested the club will look into running supporter travel for the two games.
United have yet to announce any other games of their pre-season schedule, but they are expected to travel to Blunder Park to play the Cods on Thursday July 14.
They are also likely to make the traditional journey to meet Unibond League outfit Brigg Town and North East Counties side Winterton.
There could also be a Lincolnshire Senior Cup tie.