The cheapest Lisbon to Bangkok return flight on the radar right now is €1,000, flying with TAP Air Portugal + Etihad Airways via one or more connections. It covers departures in November 2026, and every dated link below opens that exact LIS–BKK search on Skyscanner. The price we usually record on this route is €739. Across 79 recorded checks it has ranged between €464 and €1,000. Our sampling points to November 2026 as the cheapest month to fly Lisbon to Bangkok.
Prices are re-checked against Skyscanner automatically, and every one shows when it was last confirmed, so nothing here is older than it looks. Not flying from Lisbon? We track 64 other departure cities for Bangkok, listed at the foot of this page.
Prices like this tend to vanish fast. If it has gone when you look, try the days either side of the dates above, since Lisbon to Bangkok is often still worth booking within a day or two of the fare we found.