Premium economy is easiest to justify when the flight is long enough to make comfort matter but short enough that business class pricing feels ridiculous. On a five-hour route, the value comes down to sleep, schedule, baggage, and whether you need to function after landing.

Where it helps

The extra recline and legroom are most useful on evening departures, early arrivals, and routes where you need to work or drive after landing. If the fare includes checked bags or priority boarding, compare the full trip cost rather than the seat cost alone.

Where it does not

For a midday leisure flight with a good exit-row seat available, premium economy may not change the trip enough to justify a big jump. Spend the difference on a better hotel location instead.

Simple rule

If premium economy is less than 30 percent more than economy and the schedule is rough, it is worth a serious look. If it costs double, keep your money.

Not all premium economy is the same product

Some airlines' premium economy is a meaningfully different seat with real recline and dedicated service; on others it is barely upgraded main cabin with a marketing name attached. Look up the actual seat pitch and width for your specific aircraft before assuming the label means the same thing everywhere.