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How fare construction treats multi-city and open-jaw itineraries — married segment rules, fare basis, minimum stay and why some Matrix results cannot be ticketed.

Key takeaways

How do multi-city fare rules differ from open-jaw?

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Multi-city tickets chain three or more flight segments on one PNR with global fare construction rules (mileage, carrier mix, backtracking limits). Open-jaws are usually two-segment return-shaped fares with a surface break. Both can trigger married-segment logic — miss one leg, lose the rest — but multi-city adds routing validators ITA shows and Google Flights hides.

This is fare literacy for builders — beginners should start with open-jaw tickets pricing guide.

What are married segments and why do they matter?

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Married segments tie flight coupons together — the airline's system will not let you skip or rebook one without affecting others. Hidden-city and throwaway tactics fight this design. Legitimate multi-city trips still suffer if you no-show a segment due to illness — call the airline before ditching a leg.

MCT: minimum connection times apply within married connections — not between separate tickets.

Research: ITA Matrix complete guide exposes fare basis and routing codes.

Why can ITA Matrix prices fail at checkout?

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Matrix finds fares OTAs and airline sites may not ticket — fare basis mismatch, class not available, or routing only valid through a specific agency. Treat Matrix as hypothesis; confirm on airline.com before planning hotels.

When booking direct wins: thin savings on complex routes — when booking direct with the airline wins.

Multi-city vs open-jaw — verdict

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Verdict: learn the rules before chaining three carriers for "artificial" savings — married segments and unticketable Matrix ghosts waste hours. Open-jaws cover most leisure loops; multi-city is for RTW-lite and deliberate stopovers. Not for travellers unwilling to verify ticketability on the selling site.

Framework checked August 2026.

Search tools: multi-city flight search tools compared.

Multi-city fare rules FAQ

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Fare rules vary by carrier and alliance — read the fare rules link at checkout.

Stopover allowed? Depends on fare basis — not all multi-city builds allow free stopovers.

Mix carriers? Alliance RTW products differ from ad-hoc multi-city.

Evidence note

How we checked this guide

Research basis

3 external references linked in this guide and its resources. Each reference supports only the claims it addresses; a link is not evidence of first-hand testing.

Experience standard

No first-hand test or trip is implied unless the article explicitly states who tested it, when and under what conditions.

Content update date

Content updated on 8 August 2026; this is not an independent verification of every linked source. Time-sensitive prices, rules and eligibility must be checked again before purchase or travel.

Commercial independence

Commercial links are labelled before the click. Their presence is not evidence of personal testing, programme approval or guaranteed availability.

See the editorial policy, method notes, the scoped evidence ledger, or report a correction.