Delta Air Lines has delivered a strong 137.5% return over the past 5 years, yet the valuation checks point to a more mixed picture rather than a clear bargain or clear overvaluation at the current share price around US$92.77.

• Over 5 years, Delta Air Lines has returned 137.5%, which puts long term holders in a strong position and raises the question of how much upside is already reflected in the stock.
• Recent merger interest from United Airlines highlights that large scale consolidation can support investor focus on Delta Air Lines' route network and cost base. At the same time, regulatory scrutiny around any such deals may limit how much value investors can reasonably ascribe to potential future combinations.
• Delta Air Lines scores 3 out of 6 on the valuation checks, which suggests a mixed read with some metrics pointing to undervaluation and others looking more full.

The issue now is whether Delta Air Lines' current valuation still offers an appealing entry point after such a strong multi year run, or if most of the easy gains are already behind it.

Is Delta Air Lines Still Cheap on Earnings?

The P/E multiple is a useful yardstick for Delta Air Lines because earnings remain a key focus for investors in the airlines industry. At the current share price, Delta trades on a P/E of about 15.4x, which is close to the peer average of 15.0x but above the broader airlines industry average of 11.5x. That higher level indicates the market is currently paying more for Delta Air Lines earnings than for the typical airline stock.

Despite last year's merger approach from United Airlines and the attention it brought to the sector, Delta Air Lines still trades below the modelled fair P/E of 30.5x. This fair ratio reflects what might be expected for Delta given its size, margins, industry position and risk profile. It also points to a notable gap between current and modelled multiples. On this basis, the stock appears attractively priced on earnings even after its multi year share price performance.

On the P/E multiple, Delta Air Lines stock currently appears undervalued relative to the fair ratio implied by its fundamentals.

The Delta Air Lines Narrative: What Would Justify Today's Price?

Simply Wall St Narratives for Delta Air Lines are designed to connect the current P/E puzzle with clear, alternative stories about how earnings, margins and growth might develop from here. This allows you to see what would need to be true for the stock to be worth materially more or less than today’s price. Each narrative links its number to a specific view on future growth, profitability and risks that you can revisit as fresh information arrives on Delta Air Lines.

Community views on Delta Air Lines are wide apart, with one side seeing the stock as supported by premium and loyalty revenue while the other worries that current pricing already reflects too much optimism.

Bull case: 12% undervalued

"Delta is capitalizing on resilient revenue streams such as premium, loyalty, and international segments, which are expected to continue growing and thus bolster overall revenue…"

Bear case: 47% overvalued

"Margins are so thin they simply cannot accomodate any major impact, so you have to be vigilant when investing in an airline, even one as large as this…"

Do you think there's more to the story for Delta Air Lines? Head over to our Community to see what others are saying!

The Bottom Line

For investors looking at Delta Air Lines today, the market multiple view points to a stock that still screens as undervalued on earnings, even after the strong 5 year return. The mixed overall valuation checks suggest that this is not a one way bet and that some metrics already look more demanding.

The real swing factor from here is whether Delta Air Lines can sustain the earnings power that justifies paying a premium P/E to much of the industry. The central question is whether that apparent discount is compensating you for thin margins and sector risks, or whether it reflects an opportunity that the market has only partly recognised.

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.