The other three - general manager production Carol Hirschfeld, general manager programming Haunui Royal and another unnamed executive - were paid for by the taxpayer despite tough times for public broadcasting.
Spokeswoman Diane Berghan said they flew economy class but still would not reveal the total costs of the trip.
Maori TV declined to name the fifth person on the trip but Shannon Haunui, who identifies herself as a journalist, has been tweeting from Norway about the conference.
Ms Haunui attended a presentation given by Mr Mather, saying: "Jim Mather just gave an amazing korero. It's so beautiful here, a winter wonderland."
And last night she said she was in a climate change lecture given by the Prince of Monaco.
"Even here in snowy Norway it had a major effect."
Ms Berghan did not return the Herald's calls about Ms Haunui.
Meanwhile, Wilcox has also been tweeting his experience - including going to a graduation ceremony for a group of reindeer herders in Kautekeino with a royal guest.
"Prince Albert of Monaco and party at a graduation of reindeer herders in Kautekeino. We are not alone!"
Earlier in the trip, shortly after the Maori TV entourage arrived, Wilcox tweeted a photo of the group's hotel and hinted that the team were combining business with pleasure.
"Norway is cool. Just finished one shot in the icebar! Seminar presentation in 7 hours on award winning indigenous journalism."
* Correction: A report on a Maori TV trip to Norway erroneously referred to general manager production Carol Hirschfeld as "programming boss'' and general manager programming Haunui Royal as "Maori language programmer''. Also, the story said the channel had declined to reveal costs but Maori TV says it had been too soon to determine the costs but now confirms $24,500 was budgeted.