With a price-to-earnings (or "P/E") ratio of 6.3x United Airlines Holdings, Inc. (NASDAQ:UAL) may be sending very bullish signals at the moment, given that almost half of all companies in the United States have P/E ratios greater than 18x and even P/E's higher than 32x are not unusual. However, the P/E might be quite low for a reason and it requires further investigation to determine if it's justified.

United Airlines Holdings certainly has been doing a good job lately as its earnings growth has been positive while most other companies have been seeing their earnings go backwards. It might be that many expect the strong earnings performance to degrade substantially, possibly more than the market, which has repressed the P/E. If you like the company, you'd be hoping this isn't the case so that you could potentially pick up some stock while it's out of favour.

What Are Growth Metrics Telling Us About The Low P/E?

United Airlines Holdings' P/E ratio would be typical for a company that's expected to deliver very poor growth or even falling earnings, and importantly, perform much worse than the market.

Taking a look back first, we see that the company grew earnings per share by an impressive 40% last year. However, the latest three year period hasn't been as great in aggregate as it didn't manage to provide any growth at all. Accordingly, shareholders probably wouldn't have been overly satisfied with the unstable medium-term growth rates.

Shifting to the future, estimates from the analysts covering the company suggest earnings should grow by 12% per annum over the next three years. Meanwhile, the rest of the market is forecast to expand by 10.0% per year, which is not materially different.

In light of this, it's peculiar that United Airlines Holdings' P/E sits below the majority of other companies. Apparently some shareholders are doubtful of the forecasts and have been accepting lower selling prices.

What We Can Learn From United Airlines Holdings' P/E?

Generally, our preference is to limit the use of the price-to-earnings ratio to establishing what the market thinks about the overall health of a company.

We've established that United Airlines Holdings currently trades on a lower than expected P/E since its forecast growth is in line with the wider market. When we see an average earnings outlook with market-like growth, we assume potential risks are what might be placing pressure on the P/E ratio. It appears some are indeed anticipating earnings instability, because these conditions should normally provide more support to the share price.

Plus, you should also learn about these 3 warning signs we've spotted with United Airlines Holdings.

If these risks are making you reconsider your opinion on United Airlines Holdings, explore our interactive list of high quality stocks to get an idea of what else is out there.

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This article by Simply Wall St is general in nature. We provide commentary based on historical data and analyst forecasts only using an unbiased methodology and our articles are not intended to be financial advice. It does not constitute a recommendation to buy or sell any stock, and does not take account of your objectives, or your financial situation. We aim to bring you long-term focused analysis driven by fundamental data. Note that our analysis may not factor in the latest price-sensitive company announcements or qualitative material. Simply Wall St has no position in any stocks mentioned.