STN to SNN flight delays
1,083 flights · March 2025 – August 2026 · UK Civil Aviation Authority
76.89%
Arrived on time
Within 15 minutes of schedule
0.09%
Cancelled
Share of scheduled flights
—
When late, late by
Average across delayed arrivals
12 min
Delay per flight
Averaged over every flight flown
What the record says about this route
The season swings this route hard. In May it ran 23.4 points more punctual than in January — 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. SNN to STN arrives on time 9 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.
Only Ryanair flies this route in the published record, so there is no choice to weigh — the route's figures and the airline's are the same figures.
The London to Shannon route sits close to the middle of the record — neither notably punctual nor notably late.
Which airline should you fly on this route?
Over March 2025 – August 2026, Ryanair arrived on time most often on STN to SNN. Flights ran closest to schedule in November and worst in September.
Every airline on STN to SNN
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 |
|---|---|---|---|---|---|
| Ryanair | 1,083 | 76.89% | 0.09% | — | C |
Month by month
Share of flights that arrived within 15 minutes of schedule, by month flown.
The return leg
SNN to STN Shannon back to London 85.93% on time AOther routes from London
Common questions
Are flights from London to Shannon usually delayed?
76.89% of flights on the STN to SNN route arrived within 15 minutes of schedule, so roughly 2 in every ten arrived late. That is about the same as the average route in this record.
Which airlines fly from London to Shannon?
Only Ryanair appears in the published record on this route, with 1,083 flights and 76.89% arriving on time.
How often are STN to SNN flights cancelled?
0.09% of scheduled flights did not operate — about 1 in every thousand. That is in the normal range.
What is the best month to fly London to Shannon?
May, when 86.7% of flights arrived on time. The worst was January at 63.3%.
What these figures do and do not tell you
Everything on this page is counted from the flights that actually operated on STN to SNN during March 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 →