The introduction of the aircraft will allow the airline’s passengers to benefit from all-inclusive in-flight entertainment and personal in-seat video screens.
Passengers travelling in business class will enjoy the additional comfort of seats that convert into a 180-degree flat bed.
Oman Air’s chief commercial officer Barry Brown said the Airbus A330-200 is "a product upgrade that our passengers have been requesting".
"We are the only airline flying non-stop from Muscat to these destinations, greatly reducing time and connecting baggage concerns," he commented.
Oman Air operates six flights a week to Bangkok from Muscat, while the airline operates a daily flight to London Heathrow.
The airline recently said that Oman is "well placed" to be a successful tourist destination owing to its interesting scenery and its position as an emerging holiday and business destination.