The voucher waives Avios, not cash. Here is exactly what you still pay on a 2-4-1 booking, why the flights are never truly free, and how to keep the bill down.
“Two for one” is a promise about Avios, not about money. The most common disappointment with a companion voucher is discovering the cash bill at checkout — taxes, fees and carrier surcharges for both passengers. This guide sets out exactly what those charges are, roughly how much to expect, and the practical ways to reduce them.
What you’ll learn:
A companion voucher removes one thing and one thing only: the Avios cost of the second passenger. Everything else on a normal reward booking still applies, for both travellers:
Because these are charged per passenger, a 2-4-1 booking pays them twice. The voucher’s value is the Avios you avoid, not a free seat.
British Airways, like most legacy carriers, adds a carrier-imposed surcharge (historically the YQ fuel surcharge) on top of genuine taxes. It is entirely the airline’s choice, it scales with cabin and distance, and it is the single biggest reason a “free” reward flight can still cost hundreds of pounds. That is not a flaw in the voucher — it applies to every Avios redemption — but it shapes which trips are worth using a voucher on.
The takeaway: the value of a voucher is highest where the Avios saved dwarfs the cash you pay. That is why we steer people towards premium long-haul in our best uses guide and away from long-haul economy, where taxes eat the benefit.
Exact figures move with tax rates, fuel prices and exchange rates, so treat these as broad, illustrative bands rather than quotes. Always check the live figure at booking.
| Trip type | Rough cash per person | Voucher value |
|---|---|---|
| Short-haul Europe (economy) | Low | Thin |
| Long-haul economy | Moderate | Often poor |
| Long-haul Club World | Several hundred £ | Excellent |
| Long-haul First | Highest | Highest absolute saving |
To see the real numbers for your trip — Avios saved minus cash paid — use the companion voucher calculator.
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Our dedicated guide on booking through Iberia to avoid BA surcharges walks through the routing tricks in detail.
Always compare with cash. If the reward cost (Avios plus taxes for two) is close to the cheapest cash fare for the same flights, the voucher is not earning its keep. Save it for a trip where the gap is large.
The cash portion is settled with a payment card when you book. Putting it on your British Airways American Express card keeps everything on one statement, earns Avios on the spend, and moves you towards your next £15,000 voucher threshold — a small but real compounding benefit.
For how the card earns and whether the Premium Plus version pays for itself, see our Premium Plus review and the wider credit cards comparison.
The AviosArcana Editorial Team
We decode the British Airways loyalty programme in plain English, cross-checking every figure against BA’s published rules. We only recommend products we would use ourselves — and we tell you plainly when a redemption is not worth it.