Italy's flag carrier, ITA Airways, which operates flights over 64 destinations, offers prior and reliable services to their passengers. Also, it has some flexibility in making reservations, changes, cancellations, upgrades, seat selection, and more. However, if you are looking to upgrade the seats with the airlines, therefore, so, there are several modes to upgrade the flight, which information you get by tracking the down ways:
 
Upgrade the seat online-

Visit the official site of the ITA airways,
Continue to the manage booking section,
Mention the ticket number and last name and next to the search button,
Move to the upgrade option, upgrade the seats as per your preference
Pay reliable fares to the airlines and receive their confirmation on your phone.

Upgrade the seat offline-

Also, you can upgrade the seat offline by calling the ITA Airways customer service agent at 1 (877) 793-1717. You may bear out the number from the customer service page, request to upgrade the seat or share the itinerary details or your seat preference with the airline person, and you will receive its confirmation on your associated device.

How much does it cost to upgrade to business class on ITA Airways?

You must pay the fares to make an ITA Airways business class upgrade. For the premium economy to business class, pay EUR 880; for the economy to business class, pay EUR 1300 with an additional fare if required to pay.

Is it cheaper to upgrade to business class at the airport?

It depends on whether upgrading to business class at the airport is cheaper or not. However, if there is peak season, the upgraded fare is higher at the airport. If you are going to upgrade in the off-season, you must request a low-fare ticket. If the airport counter person allows it, proceed to upgrade the business class.