BKK to LHR flight delays
422 flights · January 2025 – August 2026 · UK Civil Aviation Authority
66.9%
Arrived on time
Within 15 minutes of schedule
0.47%
Cancelled
Share of scheduled flights
—
When late, late by
Average across delayed arrivals
15 min
Delay per flight
Averaged over every flight flown
What the record says about this route
The season swings this route hard. In March it ran 38.2 points more punctual than in May — a difference bigger than the one between the best and worst airlines on most routes. If the date is flexible, it is worth more than the carrier.
The two directions do not behave alike. LHR to BKK arrives on time 18.6 points more often than the outbound. Delay accumulates through the flying day, so whichever direction is scheduled later tends to carry the worse record — which is an argument for booking the morning departure if the choice exists.
The route has been getting worse. The later months run 22.2 points less punctual than the earlier ones. A drift of that size is rarely weather; it is more often an airline adding frequencies faster than the airports can absorb them.
This is a late route. Flights from Bangkok to London miss their scheduled arrival often enough that a tight connection at the far end is a connection at risk.
Which airline should you fly on this route?
Over January 2025 – August 2026, Thai Airways arrived on time most often on BKK to LHR. Flights ran closest to schedule in March and worst in May.
Every airline on BKK to LHR
Ranked by how many flights each one operated. A carrier with fewer than 100 flights in the period is listed but not graded.
| Airline | Flights | On time | Cancelled | Avg delay | Grade |
|---|---|---|---|---|---|
| Thai Airways | 422 | 66.9% | 0.47% | — | D |
Month by month
Share of flights that arrived within 15 minutes of schedule, by month flown.
The return leg
LHR to BKK London back to Bangkok 85.51% on time BOther routes from Bangkok
Common questions
Are flights from Bangkok to London usually delayed?
66.9% of flights on the BKK to LHR route arrived within 15 minutes of schedule, so roughly 3 in every ten arrived late. That is worse than the average route in this record.
Which airlines fly from Bangkok to London?
Only Thai Airways appears in the published record on this route, with 422 flights and 66.9% arriving on time.
How often are BKK to LHR flights cancelled?
0.47% of scheduled flights did not operate — about 5 in every thousand. That is in the normal range.
What is the best month to fly Bangkok to London?
March, when 81.7% of flights arrived on time. The worst was May at 43.5%.
What these figures do and do not tell you
Everything on this page is counted from the flights that actually operated on BKK to LHR during January 2025 – August 2026, as reported by the airlines to the US Bureau of Transportation Statistics. "On time" is the federal definition: arriving at the gate within 15 minutes of the scheduled time.
A route's record is a description of the past, not a forecast. Weather, air traffic control and the aircraft's earlier flights that day drive most delays, and none of them are predictable from a historical rate. What the record does tell you is whether this route runs late more often than others, and which carrier on it has the better history — which is the part you can actually act on when you book.
Cancellations are counted separately from delays because they are a different problem for a traveller: a late flight still gets you there. How the grade is calculated →