Look up per diem reimbursement rates and mileage deductions for business travel worldwide.

Complete
Ireland → Attica, GR
Item Name Destination Amount Conditions
Meal & Lodging Athens, Greece 221 EUR per night Overnight rate covering accommodation and three meals for a 24-hour absence abroad on official business.
Vouched Accommodation (VA) Rate Athens, Greece 110.5 EUR per night Vouched Accommodation (VA) rate: paid in addition to the vouched cost of accommodation. Per Note 2 of Circular 07/2017 the VA rate should not be routinely used except for travel to Brussels, where the vouched cost of room plus the VA rate applies to all officers on overnight visits.
Daily allowance Athens, Greece 73.67 EUR per day Ten-hour rate: applies to an absence abroad of ten hours or more without an overnight stay.
Daily allowance Athens, Greece 36.83 EUR per day Five-hour rate: applies to an absence abroad of between five and ten hours.

Source URL:
https://www.revenue.ie/en/employing-people/documents/dper-circular-07-2017-subsistence-allowances-abroad.pdf
This source provides official travel rate information from revenue.ie.