Fare Class (Booking Class)
A letter code (A–Z) assigned to each seat on a flight that determines the price, flexibility, and miles earned — not the same as cabin class.
What is a fare class?
Fare class (also called booking class or reservation class) is a single letter code — such as Y, M, K, V, or Z — assigned to each airline ticket that determines its price, cancellation and change rules, and the number of frequent flyer miles it earns. Fare classes are completely separate from cabin class (Economy, Business, First). An Economy cabin might contain 15 different fare classes, each with a different price and rule set.
Airlines use fare classes to manage yield: they start by releasing a small number of seats in the cheapest class (say, Q at £99), then progressively release more expensive classes (K, M, Y at £149, £229, £389) as departure approaches and the cheaper classes sell out. This is yield management in action.
Why fare classes matter
If you are collecting frequent flyer miles, fare class is critical. An Economy ticket in Y class might earn 100% of the miles, while an Economy ticket in Q class earns only 25% of the miles — even if both passengers sit in the same cabin. Business class tickets in J or C class earn 150–200% of miles, while heavily discounted business fares in Z or D class earn far less.
Fare classes also determine upgrade eligibility. Airlines prioritise upgrade requests from passengers in the most expensive economy fare classes (Y, B, M) over those in discounted classes (K, L, Q, N). Buying an upgradeable economy fare is the most reliable way to get a paid or points upgrade.
How to find your fare class
Your fare class is shown in your booking confirmation, usually as a single letter next to your flight number or in the fare basis code. On most airline websites, you can also see the fare class during the booking process when you expand the fare details. Google Flights shows fare basis codes on ITA Matrix, a tool used by many professional fare researchers.
When comparing ticket prices, always check whether a lower price also means a lower fare class with stricter change fees and fewer miles earned. A £30 saving that costs you 10,000 miles and a £100 change fee is not necessarily a good deal.