What this calculator does

Japan Airlines runs two separate currencies, and almost every mistake in JMB comes from confusing them. JMB miles are what you spend on award tickets and upgrades. FLY ON Points — universally abbreviated FOP — are what determine your status tier. Both accrue on the same qualifying flight, but they are calculated differently and cannot be exchanged for one another.

Our JAL tab computes both for any route: the JMB miles you will bank, the FOP you will earn toward Crystal, Sapphire or Diamond, and what that leaves outstanding for the tier you are chasing. If you are running the numbers on a status run, FOP is the figure that matters — miles are the by-product.

How JMB miles are earned — international

International accrual is distance flown × a rate set by your booking class. Not by cabin — by the fare you actually bought, which is why two people in the same Business seat can bank very different totals.

The deeper the discount, the lower the rate. Exact percentages are set per booking class letter — check the fare rules on jal.co.jp when you book.

How JMB miles are earned — domestic and Class J

Domestic accrual is more finely graded than international, and this is where Japanese shugyō (status-run) planning lives.

Class J is the quiet value play. For roughly ¥1,000–3,000 on top of a standard domestic fare you get a wider seat, priority handling and 110% accrual instead of 50–100%. On a 55-minute hop it is often the best yen-per-point decision available.

FLY ON Points — what each tier actually requires

FOP accrue over the calendar year, January to December, and reset. Each tier has a total requirement and a sub-requirement that must be flown on JAL Group metal — you cannot reach status entirely on partners.

Here is how the tiers map to oneworld. JMB Crystal is a JAL-side tier — priority handling and JAL lounge access — and it carries oneworld Ruby status, as JAL’s own status page says. JMB Sapphire is the threshold that matters: it grants Oneworld Sapphire automatically, which is where Business Class lounges across the alliance open up. JMB Diamond confers Oneworld Emerald, the alliance’s top tier.

JGC — the reason Japanese flyers do status runs at all

JAL Global Club (JGC) sits outside the annual FLY ON cycle and is the single most important thing to understand about JMB. Qualify once, join, and you hold Sapphire-equivalent Oneworld status permanently — without requalifying each year.

That is what the phrase JGC 修行 (JGC pilgrimage) means: a deliberate year of flying, often on cheap domestic Class J sectors, aimed at lifetime status rather than a one-year benefit. It is the endgame for most Japanese points collectors, and it has no real equivalent in The British Airways Club or most Western programmes.

What changed in 2025 and 2026

Finnair joins FLY ON from 1 May 2026. Finnair-operated flights become FOP-eligible, which opens a Helsinki routing to Europe as a status-earning path for the first time. For anyone planning a run, that is a materially new option.

Domestic awards were repriced on 10 June 2025. Domestic award tickets start at 4,500 miles one way, but the chart was recut into seven distance zones (A–G) and base requirements rose by 500 miles for both Standard and Class J. Where a seat is not available at the base rate, Tokuten Kōkūken PLUS (award ticket PLUS) lets you book it for a variable surcharge in miles.

Using BA Avios on JAL instead

You do not need JMB miles to fly JAL. The British Airways Club members can book JAL-operated flights as partner awards using Avios through ba.com. London to Tokyo — Haneda or Narita — remains one of the strongest-value redemptions in the Oneworld network, particularly off-peak.

The aircraft matters as much as the price. The JAL Sky Suite on the 787-9 is a staggered 2-2-2 where true window seats get their own corridor, and the A350-1000 carries JAL’s newest cabin. Both are among the best Business Class products flying, and both are bookable with Avios.