Error Fare Recap: May 2026's Best Mistakes

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Error Fares — May 2026 Recap

Error fares — genuine pricing mistakes by airlines or GDS systems — surface unpredictably. May 2026 had several. Here is the roundup.

Air France — Business Class AMS–Montreal at Economy Price

The biggest error of the month. Air France briefly listed business class seats on the Amsterdam–Montreal route at €389 return — approximately the correct economy price — through its own website and some OTAs. The error was live for approximately 3 hours on 4 May. Several hundred bookings were confirmed. Air France has honoured the tickets, citing EU regulations requiring airlines to honour confirmed bookings. Estimated fair market value: €2,800+ return.

KLM — Business Class Mix-Up on Asia Routes

A different issue: KLM incorrectly applied a promotional economy fare to business class seats on select Amsterdam–Bangkok and Amsterdam–Kuala Lumpur routes on 11 May. The window was shorter (~45 minutes) and fewer bookings went through. Outcome: mixed reports, with some passengers receiving honour confirmations and others being refunded. KLM has not made a blanket statement.

Ryanair — Incorrect Tax Calculation on UK–Spain Routes

A more modest but still notable error: Ryanair displayed fares between several UK airports and Spanish destinations that omitted APD (UK air passenger duty) — effectively discounting tickets by £13–26 per person depending on the route. Lasted approximately 6 hours on 8 May. Bookings appear to have been ticketed at the displayed price.

How to catch these: Error fares are unpredictable by definition. The best approach is to be subscribed to deal alerts (FairFares, HUCA, Secret Flying) and to check and book fast — most windows are under 2 hours.

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