The Warriors won both games as they prepare for the Netball World Cup Qualifiers later this month.
Oldham travelled to Northern Ireland as part of their preparations for the upcoming season, with the matches giving their players the chance to face international opposition.
Oldham reduced the losing margin in the second match, although no final scores were provided.
Senior head coach Debbie Hallas said: "It was an amazing opportunity for our players to travel and play against international opposition. For some, it was a once-in-a-lifetime experience.
"For our younger players, it helped expose them to a higher level of competition and will stand them in good stead ahead of what promises to be a busy season.
"It was also a fantastic team-building opportunity. On Sunday, the team took part in a treasure hunt around Belfast, photographing themselves at some of the city's most famous landmarks.
"We would like to thank the Warriors for the experience and wish them every success in the upcoming World Cup Qualifiers."
Northern Ireland are preparing for the Netball World Cup Qualifiers, which begin on 25 September.
Northern Ireland, Scotland, Wales and the Republic of Ireland will compete for two qualification places at the Netball World Cup.
Warriors head coach Sheonah Forbes said: "I'd like to thank Oldham for travelling to play us. It can be difficult to secure quality opposition in preparation for events like these, so the opportunity was extremely beneficial for our squad.
"We're focused, firing and ready for the qualifiers. We hope to see plenty of support there."
Oldham's squad for the trip was Jasmina Jones, Lois Cowin, co-captain Hannah Diamond, Amelia Hall, Grace James, Sarah Rexstraw, Kodey Davies, Charlotte Spence, Alice McGeachy and co-captain Sophia Warn.
Hallas was joined in the management team by technical coach Jade Clarke and team managers Sarah Barlow and Tanya Burbidge.
