Passengers can upgrade From Economy to Business class. Still, you may be required to pay the applicable charges if you want to enjoy additional benefits and greater comfort that will make your journey worthwhile by paying a minimal fee. Therefore, you can upgrade to Business class via Manage My Trip or call the customer support agent directly. Please note that customers must meet some eligibility requirements for the Malaysia Airlines business class Upgrade, which is discussed below.

You can purchase the Last-minute Upgrade at the Airport check-in counter 3 hours before the flight departure time.
Passengers must remember that the services offered in the business class upgrade may vary depending on the aircraft to aircraft.
The checked baggage allowance depends on the original purchase only, whether Economy class or Business class. However, you are not supposed to get extra checked baggage if you have upgraded to Business class or Suite at the last minute.

What cost do I have to pay for a seat upgrade on Malaysia Airlines?

Travelers have to pay for the seat upgrade only if the request is accepted. However, the charges depend on the travel distance and other factors. Generally, Passengers need to pay an upgrade fee of USD 200 per person, including the fare difference.

How do I get a complimentary upgrade to Business class on Malaysia Airlines?

There are fewer chances to get a complimentary upgrade to Business class on Malaysia Airlines. Follow the given tricks to get a free upgrade.

If you are a frequent traveller, join the loyalty program. This allows you to earn miles that can be used for upgrades.
Use an Airline Credit card for every purchase.
Book Red Eye or travel midweek.
Ask the Airline travel agent about the discount deals.
Check Upgrade critieria.