Looking into the current session, Booking Holdings Inc. (NASDAQ:BKNG) shares are trading at $1642.95, after a 0.90% spike. Moreover, over the past month, the stock spiked by 0.71%, but in the past year, decreased by 12.18%. Shareholders might be interested in knowing whether the stock is undervalued, even if the company is performing up to par in the current session.

The stock is currently higher from its 52 week low by 48.38%. Assuming that all other factors are held constant, this could present itself as an opportunity for investors trying to diversify their portfolio with Travel Services stocks, and capitalize on the lower share price observed over the year.

Depending on the particular phase of a business cycle, some industries will perform better than others.

Compared to the aggregate P/E ratio of 9.86 in the Travel Services industry, Booking Holdings Inc. has a higher P/E ratio of 20.89. Shareholders might be inclined to think that Booking Holdings Inc. might perform better than its industry group. It’s also possible that the stock is overvalued.

There are many limitations to price to earnings ratio. It is sometimes difficult to determine the nature of the earnings makeup of a company. Shareholders might not get what they're looking for, from trailing earnings.