Glossary
Definition: A fare basis code is an alphanumeric code on your airline ticket that identifies the exact fare rules including the fare class, routing, validity period, advance purchase requirements, and change/refund conditions.
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Term at a glance
| Term | Fare Basis Code |
|---|---|
| One-liner | A fare basis code is an alphanumeric code on your airline ticket that identifies the exact fare rules including the fare class, routing, validity period, advance purchase… |
| Where it matters | Premium-cabin booking decisions, fare-rules interpretation, airline-product comparison. |
| Related concepts | Fare Class · PNR · E-Ticket · GDS · Consolidator Fare |
| Last verified | 2026-05-07 |
A fare basis code might look like "JAXOWUS" or "YIF3M1" — a seemingly random string of letters and numbers that encodes detailed fare information. Each component has meaning: the first letter is typically the fare class, followed by codes indicating the route type, season, advance purchase period, and other conditions.
Travel agents and airline pricing systems use fare basis codes to construct itineraries, verify pricing, and apply correct rules. The fare basis code determines everything about what you can and cannot do with your ticket: can you change dates? Is it refundable? What’s the baggage allowance? Which routing restrictions apply?
Understanding your fare basis code is useful for knowing your ticket’s flexibility. BookMyBusinessClass agents can decode any fare basis code and explain your ticket’s exact rules, including change fees, refund policies, and routing restrictions. This transparency is important for business travellers who may need to alter plans.
In booking practice
At a Glance
| Term | Quick definition | Reference |
|---|---|---|
| Excursion Perk | A United MileagePlus benefit allowing elite members to add a free Star Alliance partner stopover to a one-way… | Read |
| Fare Bucket | A fare bucket is the limited inventory of seats available at a specific fare class and price level on a given… | Read |
| EU261 | EU261 (EC Regulation 261/2004) is European legislation that entitles air passengers to compensation, care,… | Read |
| Fare Class | A fare class (or booking class) is a letter code assigned to an airline ticket that determines its price,… | Read |
| ESTA | Electronic System for Travel Authorization — a US Customs and Border Protection pre-departure authorization… | Read |
| Fare Combinability | Fare combinability rules govern whether two different fares (e.g. one outbound, one return) can be combined… | Read |
Related Terms
A United MileagePlus benefit allowing elite members to add a free Star Alliance partner stopover to a one-way award redemption at no additional miles cost. Originally a 2009 programme feature, the Excursion Perk has survived multiple programme restructures and remains a sweet-spot stretch for stopover-style itineraries.
A fare bucket is the limited inventory of seats available at a specific fare class and price level on a given flight. Airlines allocate different numbers of seats to each bucket, and prices increase as cheaper buckets sell out.
EU261 (EC Regulation 261/2004) is European legislation that entitles air passengers to compensation, care, and assistance when flights departing from or arriving in the EU are delayed, cancelled, or overbooked.
A fare class (or booking class) is a letter code assigned to an airline ticket that determines its price, refund/change rules, mileage earning rate, and upgrade eligibility. Each cabin contains multiple fare classes at different price points.
Electronic System for Travel Authorization — a US Customs and Border Protection pre-departure authorization required for visa-free entry to the United States by Visa Waiver Program-eligible nationalities. Required for both entry and most transit through US airports; valid for 2 years (or until passport expires).
Fare combinability rules govern whether two different fares (e.g. one outbound, one return) can be combined into a single ticket. Restricted combinability can prevent mixing certain fare types or carriers, while open combinability allows flexibility — important for multi-city, open-jaw, and one-way premium itineraries.
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