Pricing errors on flights: what they are and how to catch them
Genuine airline pricing errors are rare but real — here's what causes them, how to think about spotting one, and what to do if you find one.
Every so often, an airline accidentally sells tickets for far less than they should — a misplaced decimal, a tax that doesn't get applied, a currency conversion that loads at the wrong rate. These windows are usually short, sometimes only open for a few hours before someone notices and the fare gets pulled.
They're rare, but they do happen. And knowing what causes them — and how to think about spotting one — makes it much less of a long shot.
What causes a pricing error?
Airline pricing is largely automated. Systems are constantly updating fares across thousands of routes, factoring in taxes, fuel surcharges, currency conversions and competitor pricing. When something in that chain breaks — a decimal point in the wrong place, a surcharge that doesn't get added, a currency that loads incorrectly — the published price can end up well below what it should be.
It isn't always a technical glitch either. Sometimes it's a sale that's been configured incorrectly, or a new route where the pricing logic hasn't been properly set up yet. Either way, the result looks the same from the outside: a price that doesn't add up against everything else on that route.
How to actually spot one
Honestly, catching one by chance is close to impossible — you'd need to be looking at exactly the right route at exactly the right moment, which is mostly down to luck.
The more realistic approach is to keep an eye on prices over time and notice when something falls well outside the normal range for that route. If a return fare that usually moves within a fairly narrow band suddenly drops a long way below that, it's worth a closer look — that's the kind of signal that's far more useful than any single snapshot price.
This is the basic idea behind what Plof Air does: rather than just showing today's price in isolation, it's about tracking a route over time so that a genuinely unusual drop stands out from normal day-to-day movement and seasonal sales.
Do airlines honour pricing errors?
It varies. In most jurisdictions, airlines aren't legally obliged to honour tickets sold because of a genuine system error — but plenty choose to anyway, particularly for smaller errors or when the booking was made quickly and in good faith.
The sensible approach if you do spot something that looks like an error: book the flight, but hold off on anything non-refundable (hotels, car hire) until the airline has actually confirmed the ticket.
The more reliable opportunity: ordinary price drops
Genuine pricing errors are rare. Ordinary price drops — caused by new competition on a route, a seasonal sale, or simply low demand — happen far more often, and they're a much more dependable thing to plan around.
The strategy is the same either way: have something keeping an eye on the routes you care about, and be ready to move when something genuinely worth acting on shows up.
Set up a free alert and we'll let you know when we spot one →