Sydney to London via Singapore Delayed — BA and Qantas EU261 Guide

Is the Singapore stop a problem for compensation?

Not on a single ticket. The regulation looks at final-arrival delay at LHR or SYD, not at intermediate airports. Singapore being a non-EU/UK airport doesn't break the chain — what matters is the operating carrier and the original departure airport.

Why does BA pay both ways but Qantas only one way?

BA is a UK carrier — UK261 applies on every BA-operated flight worldwide, including SYD–SIN–LHR (outbound). Qantas is Australian — UK261 only applies when Qantas departs from a UK airport (return). The asymmetry is fundamental.

What if my BA SYD–SIN leg is on time but the BA SIN–LHR leg is delayed?

On a single BA ticket, you're fully covered. UK261 looks at LHR final arrival vs original schedule. If you arrive at LHR 3+ hours late because of the SIN–LHR delay, BA owes £520 per passenger.

What if I have separate tickets for SYD–SIN and SIN–LHR?

Each ticket is treated independently. You only get UK261 protection if a leg itself is delayed 3+ hours; missed-connection protection between separate tickets does not apply. Always book Australia–Europe on a single through-ticket.

Which compensation is bigger: BA's £520 or Qantas' £520 (when applicable)?

Same amount. Both are UK261 long-haul tier — £520 (~A$1,000) per passenger. The difference is when each applies: BA pays both directions; Qantas only the LHR-departing return.