Seat pitch is a significant factor for our comfort on a flight, as it largely determines the amount of legroom available to us. This is particularly significant on long haul flights, with its inherent risk of DVT.
Seat Pitch is the distance from any point on one seat to the exact same point on the seat in front or behind it. Whilst it is not the same as legroom, it does give you a very good approximation of how much seat room to expect.
Leg room is more accurately measured from the inside back of one seat, to the outside back of the seat in front (i.e. the space your leg occupies from hip to knee). UK regulations set a minimum distance of 26" for this measurement, which is equivalent to a seat pitch of about 28". Airlines usually quote the larger seat pitch measurement in their literature, and so for consistency reasons, this dimension has been used in the table below.
The following table shows the typical seat pitch offered by an airline on international flights; in general, planes used for long-haul flights tend to have a greater seat pitch than short flights. Where the seat pitch is given as a range, this indicates different types of aircraft in the fleet with slightly different seat pitch.
Do bear in mind however, that these measurements may not be available on all of an airline's fleet of aircraft, and in some cases, the proportions represent new installations that may not be available across the whole fleet of aircraft.