Mr English told TV One's Breakfast that New Zealanders were getting value for money from his colleagues' travel.
That was because they were attending a wide range of other events and meetings while in Europe, and not just the rugby.
"I think New Zealanders would expect some form of representation from the government in the form of the sports minister and the Prime Minister to actually be at this game. Do you think we should stay home because we can't afford it?" Mr English said.
"The Prime Minister is over there largely because of the free trade agreement launch with Europe, and that's why the Trade Minister [Tim Groser] is there. So, actually they are economising."
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Dr Coleman will speak at a UNESCO Conference on sports doping in Paris and will have a range of health-related meetings in London.
Mr Key has chaired a meeting of the International Democratic Union in Marrakesh. In Brussels he will meet with the President of the European Council and European Commission.
The trip will focus on starting free trade negotiations with the EU, which has recently decided to move on FTAs with New Zealand.
In London, Mr Key will meet with British Prime Minister David Cameron and Her Majesty the Queen. Mr Groser will be joining Mr Key in Brussels and London.
Education Minister Hekia Parata is now back in New Zealand, having attended the All Blacks' quarter and semi final. She was in Europe for an OECD education summit.
A spokeswoman for Dr Coleman said her understanding was that tickets to see the All Blacks were provided by tournament organisers, and other trip expenses covered by the Government.
There has been an unusually close link between the All Blacks and politicians this RWC, after NZ Rugby asked to have the team naming hosted at Parliament.
Last week Mr Key warned taxpayers to brace themselves for high ministerial hotel bills in the next expense release, because of the "huge" cost of hotel rooms in London during the RWC.
He will be hoping the All Blacks win this weekend, having made a bet with Australian Prime Minister Malcolm Turnbull that the leader of the losing country will wear a tie in their Anzac rival's colours in Parliament during question time.
In the stands
• Prime Minister John Key
• Sports Minister Jonathan Coleman
• Trade Minister Tim Groser
• Labour leader Andrew Little (paying all trip expenses)