London Tokyo Business Class: 2026 Avios Devaluation — 100,000 Avios vs Cash, Book or Wait

The winner rule is conditional, not absolute. Avios wins only when (one-way cash business fare minus one-way award taxes and fees) divided by Avios required exceeds your personal floor. Run that division on the exact 2026 date you intend to fly, because the chart that applies to your booking depends on when the ticket is priced, not on when you started planning. A redemption that clears your floor today can fall below it once the new pricing takes effect, and the only way to know which side of the line you are on is to price the specific date.

If the post-December-15 Avios number pushes your cents-per-Avios below your floor, cash wins for that trip. Hold the Avios, pay the fare, and revisit the redemption only when you can verify the exact award price against the exact cash price on a date you have confirmed. Guessing at either number is how people overpay in points they cannot earn back at the same rate.

So the practical sequence is short. Confirm the date. Pull the one-way Avios requirement, the one-way cash business fare, and the one-way award taxes and fees. Divide. Compare against your stated floor. Book with Avios now only if the result clears it; otherwise hold Avios and pay cash until you can verify the numbers on a date that is real.

Costs and numbers that matter

Before you decide anything, you need four numbers on paper, and each one has to be labeled one-way or round-trip so you never divide mismatched units. The first is the Avios price itself: pull up the same London–Tokyo business-class booking flow twice — once for a date before December 15, 2026, and once for a date after — and record the Avios required for a one-way redemption from each. The Points Guy reports flights cost up to 14% more Avios under the new chart, so the gap between your two screenshots is the actual hit you'd take, not a guess.

The second number is the cash fare. Search the same date and the same carrier for a one-way business ticket, and take the price from a live search, not a cached fare or an old email. Cached fares are the single most common way readers talk themselves into a bad redemption — the fare moved, the Avios price didn't, and the math quietly flipped.

The third input is the taxes and carrier surcharges attached to the award, again one-way. These do not change when the chart changes, but they change your cents-per-Avios math, because the surcharge is part of what you pay to fly on Avios. If you ignore it, you'll overstate the value of your points and book a redemption that loses to cash.

The fourth is the cash fare's own taxes-and-fees component, which you compare against the award's surcharges — not against the base fare. The table below is the checklist; fill in every cell before you decide.

Pre-flight checklist: price the exact date in Avios and in cash, one-way and round-trip separately; record award taxes; compute cents per Avios; compare it with your floor; confirm the Avios price is at or below your pre-change level; check change and cancellation rules; decide only after all six lines are filled. If any line is blank, hold Avios and pay cash.

Decision rules

Use these four rules as a decision tree, not as a forecast. Each rule depends on whether your London–Tokyo business-class date is fixed and on how your cents-per-Avios compares with your own floor, so start by pricing the exact 2026 date in both Avios and cash before applying any rule. Do not apply a rule until both prices are for the same cabin, same direction, and same date.

If your date is fixed and the pre-December-15, 2026 cents-per-Avios is above your floor, book with Avios now. A confirmed date removes the main reason to wait, and a value above your floor means the redemption already clears your minimum acceptable return on that exact itinerary.

If your date is fixed but the pre-December-15, 2026 cents-per-Avios is at or below your floor, do not book with Avios now. Price the same itinerary in cash, hold the Avios, and revisit only if a later check shows a better cents-per-Avios on a date you can actually fly.

If your date is flexible, wait until after December 15, 2026, then re-price the exact date in both Avios and cash. Book with Avios only if the post-change cents-per-Avios still clears your floor; flexibility is what makes waiting defensible because you are not protecting a single departure.

If the post-change cents-per-Avios falls below your floor, pay cash and preserve Avios for a route the devaluation hit less. The point of the floor is to stop a weak redemption from consuming points that may work harder on another London–Tokyo or partner itinerary.

Apply the rules in order: fixed date first, then value, then flexibility, then fallback. If two rules seem to conflict, start with the fixed-date rule because a confirmed seat is usually the scarcer constraint. That keeps the decision tied to a verified price on an exact date rather than to a guess about how the chart change will affect your booking.

Also worth reading Delta SkyMiles 2026: JFK to London · Lufthansa 2026 award devaluation · British Airways Avios 2026: Up

What to do next

Step	Action	Why it matters
1	Price your exact 2026 London–Tokyo business-class date in Avios in the British Airways Club booking flow before the chart flips.	It shows whether the redemption is at or below the pre-devaluation level.
2	Price the same 2026 London–Tokyo business-class date in cash before the chart flips.	Dual pricing is required before deciding between Avios and cash.
3	Confirm the travel date is fixed before booking with Avios.	The book-now rule applies only when you have a confirmed date.
4	If the Avios price is at or below the pre-devaluation level and the date is confirmed, book with Avios now.	This is the only condition for booking before the up to 14% increase takes effect.
5	If the Avios price is above the pre-devaluation level or the date is not confirmed, hold Avios and pay cash.	This follows the wait side of the rule and avoids a worse redemption.
6	After December 15, 2026, re-check the same London–Tokyo business-class date in the live booking flow before using Avios.	It lets you verify the post-devaluation number before deciding.

Frequently Asked Questions

When is the Avios award chart that applies to my booking determined?

The chart that applies to your booking depends on when the ticket is priced, not on when you started planning.

What formula decides whether Avios beats paying cash?

Avios wins only when (one-way cash business fare minus one-way award taxes and fees) divided by Avios required exceeds your personal floor.

What should I do if the post-December-15 Avios number pushes my cents-per-Avios below my floor?

If the post-December-15 Avios number pushes your cents-per-Avios below your floor, cash wins for that trip, so you should hold the Avios and pay the fare.

Why can't I rely on a redemption that clears my floor today?

A redemption that clears your floor today can fall below it once the new pricing takes effect, and the only way to know which side of the line you are on is to price the specific date.

What labeling rule applies to the numbers I need before deciding?

Before you decide anything, you need four numbers on paper, and each one has to be labeled one-way or round.

What is the practical sequence for deciding whether to book with Avios or cash?

Confirm the date, pull the one-way Avios requirement, the one-way cash business fare, and the one-way award taxes and fees, divide, compare against your stated floor, and book with Avios now only if the result clears it; otherwise hold Avios and pay cash until you can verify the numbers on a date that is real.

Quick answers

What condition must be met for Avios to win?	Avios wins only when (one-way cash business fare minus one-way award taxes and fees) divided by Avios required exceeds your personal floor.
Why should that division be run on the exact date you intend to fly?	Because the chart that applies to your booking depends on when the ticket is priced, not on when you started planning.
What happens if the post-December-15 Avios number pushes your cents-per-Avios below your floor?	Cash wins for that trip.
What is the practical sequence before booking?	Confirm the date, pull the one-way Avios requirement, the one-way cash business fare, and the one-way award taxes and fees, divide, compare against your stated floor, and book with Avios now only if the result clears it; otherwise hold Avios and pay cash until you can verify the numbers on a date that is real.
What must be prepared before deciding anything?	Before you decide anything, you need four numbers on paper, and each one has to be labeled one-way or round.