Understanding Flight Pricing

Flight prices change hundreds of times a day and vary dramatically based on factors most travellers never see. Here is how airlines actually set prices — and what that means for when to buy.

Yield management

Airlines use a technique called yield management (or revenue management) to maximise income from every flight. The principle is simple: sell each seat at the highest price the market will bear at that moment. In practice, this means:

• Each seat on a plane is assigned to a fare bucket — a price band. As cheaper buckets sell out, the next-cheapest bucket becomes the lowest available price.
• If a flight is not selling well, the airline may open lower fare buckets to stimulate demand.
• If demand is high, lower buckets close early and only expensive seats remain.

Fare classes explained

When you see "Economy" on your ticket, you are actually in one of many fare sub-classes — each with a single letter code. Y and B are typically full-fare economy. M, H, K, Q, V are discounted economy buckets, roughly in descending order of price and flexibility. The cheapest class available (often W or G on budget-adjacent carriers) usually has the most restrictions: no changes, no refunds, basic boarding priority.

Why prices spike close to departure

As a departure date approaches, airlines shift their pricing to capture late-booking business travellers who have less price sensitivity. Cheap fare classes close. If the plane is already nearly full, every remaining seat is priced at a premium.

This is why the window of 4–8 weeks ahead (for short-haul) tends to offer the best prices: the cheap buckets are still open, but the plane is filling up fast enough that they will close soon.

Demand signals that move prices

• School holidays push up family-friendly routes sharply. Prices for popular European beach destinations can triple in the week before UK half-term.
• Major events (concerts, sports finals, conferences) spike prices for specific city pairs on specific dates.
• Weather anomalies sometimes cause last-minute demand surges on short-haul warm-weather routes.

How FairFares uses this

FairFares tracks the full price history for each route and compares today's fare against that baseline. When an airline opens a lower fare bucket unexpectedly — or when demand for a route is weak and prices drop — we surface it immediately. You see the deal before the bucket closes and the price rises again.