The decision comes following a Swedish Radio documentary in October, which revealed that guards were staying at five-star hotels and flying business-class back to Sweden on all flights that were longer than three hours.
The general director of the prisons and probation service says that policy has now changed.
"That is something we will be clearer with in the future, that the whole of our organisation follows the travel policy for the civil service and the prison and probation service in particular", Nils Öberg tells Swedish Radio.
"If you are travelling within Europe then that means economy class, unless there are extremely good reasons for choosing something else. That would cover about 70 percent of the journeys we make, and then we have taken a large step towards harmonising our own rules with those of the rest of the civil service", he adds.