Originally Posted by
Biscoff27
If you do not have Expert Flyer, Expedia can show you the fare class. If you select the Mint flight, click on "show details," and it will say something like Business (C).
Keep in mind that booking class code inventory does not necessarily correspond to fare availability. For instance, suppose the lowest I-class fare requires a 21-day advance purchase. Searching for availability on Expedia within 21 days will not produce any results, even if flights have I-class open.