Difference in flight time

I flew with easyjet from Basel-Mulhouse (BSL) to London Gatwick (LGW) in September 2012. The flight took exactly 1 hour. I will fly to London on Ocotber 7th, same route, again with easyjet. This time, the flight will take 1.5 hours.
Why does it suddenly take longer? I checked other dates and times; it always takes 1.5 hours now.
Best Answer
One possibility is that somewhere along the line they noticed the flight was often late, so they bumped the scheduled arrival such as to have a better chance of making it. But they kept the scheduled departure such that they can depart on time if the aircraft is ready.
This makes business sense if a reputation for not being on time will cost them more customers than a longer scheduled duration will.
After all, on most routes low-cost carriers such as Easyjet compete primarily on price, not on convenience to the traveler. Their customers will hardly grumble about the flight taking half an hour more when they book it, but they will complain to all their friends if they arrive later than they had made plans for.
Nobody complains about arriving early, though.
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How do you calculate flight time difference?
Calculate the difference in arrival and departure times.Count how many hours are in between the estimated arrival and departure to get an estimate of how long you will be in the air. If you're using military time, simply subtract the time you depart from the time you arrive.Why do flights take different times?
The jet stream is the real reason your flight time varies depending on the direction of your destination. Jet streams are air currents that happen at very high altitudes, including those which planes frequently fly in.Why are flight times shorter west to east?
Jet streams are, at their most basic, high-altitude air currents caused by atmospheric heating and the inertia of the earth's rotation\u2014and they're the reason why flights from west to east are faster than the same route traversed in the opposite direction.Why do flights take longer one way than the other?
The reason it took so much longer to fly back is the jet stream, a river of fast-moving air high up in the sky. Jet streams are usually about 100 miles wide. They can be thousands of miles long and are found all over the earth. To be called a jet stream, the wind must be moving faster than 60 mph.Flight Time Comparison - DJI Mavic Mini / Spark / Air / Pro / 2 Pro
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Answer 2
The takeoff and landing slots get assigned to the highest bidders and can be changed around.
Also the routing of the airplane can be altered, either for economical (fuel consumption) or for airtraffic reasons.
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