The world’s biggest airlines by revenue in 2026 — and why IndiGo is 8th by flights but 22nd by sales
Delta Air Lines is the world’s biggest listed airline by revenue at $68.3 billion a year. InterGlobe Aviation, which runs IndiGo, is 22nd at $10.0 billion — even though IndiGo operates more flights than all but seven airlines. Here is the ranking, and what explains the gap.
In short
- Delta Air Lines leads the world’s listed airlines with $68.3 billion in annual revenue (Q3 2025 to Q2 2026), per CompaniesMarketCap data published by Visual Capitalist.
- United ($62.9 billion) and American ($56.0 billion) complete a US top three worth more than $187 billion combined.
- Lufthansa ($47.1 billion) is Europe’s largest; China Southern ($25.3 billion) is Asia’s largest.
- InterGlobe Aviation (IndiGo) is 22nd at $10.0 billion — even though IndiGo is 8th in the world by number of flights.
- The list covers publicly traded airlines only, so state-owned carriers such as Emirates and Qatar Airways do not appear.
Delta Air Lines is the world’s biggest listed airline by revenue: $68.3 billion over the four quarters from Q3 2025 to Q2 2026. InterGlobe Aviation, the company behind IndiGo, is 22nd at $10.0 billion.
The figures come from CompaniesMarketCap, charted by Visual Capitalist. Set beside a ranking by number of flights, where IndiGo is 8th in the world, they tell an interesting story about how airlines make money.
The top ten by revenue
- Delta Air Lines (US) — $68.3 billion
- United Airlines (US) — $62.9 billion
- American Airlines (US) — $56.0 billion
- Lufthansa (Germany) — $47.1 billion
- International Airlines Group (Spain/UK) — $39.1 billion
- Air France-KLM (France/Netherlands) — $36.0 billion
- Southwest Airlines (US) — $28.9 billion
- China Southern Airlines (China) — $25.3 billion
- Air China (China) — $23.6 billion
- China Eastern Airlines (China) — $19.4 billion
The list continues to 25, ending with Hainan Airlines, Jet2 and JetBlue at just over $9 billion each; the full ranking is on Visual Capitalist. All figures are in US dollars, and only publicly traded airlines are included.
The US big three
Delta, United and American together earned more than $187 billion. American operates the most flights of any airline in the world, yet it earns less than both Delta and United — an early hint that flight volume and revenue do not move in step.
Europe’s groups and Asia’s leaders
Europe’s biggest earners are groups built by merging national airlines. Lufthansa ($47.1 billion) leads, ahead of International Airlines Group ($39.1 billion) — formed in 2011 from British Airways and Iberia — and Air France-KLM ($36.0 billion), formed in 2004. Ryanair, Europe’s largest low-cost carrier, is 11th at $18.2 billion.
In Asia the three Chinese majors lead: China Southern ($25.3 billion), Air China ($23.6 billion) and China Eastern ($19.4 billion). Korean Air ($17.8 billion), Singapore Airlines ($16.0 billion) and Cathay Pacific ($15.0 billion) follow further down.
IndiGo: 8th by flights, 22nd by revenue
IndiGo operated 749,156 flights in 2024, the eighth-highest count in the world. By revenue it is 22nd. Two things explain most of that gap:
- What each flight sells. IndiGo’s network is mostly short domestic routes flown by single-aisle aircraft, sold at low fares. Delta, United and Lufthansa sell far more long-haul and premium-cabin seats, and each of those tickets is worth many times a short economy fare.
- Currency. InterGlobe reports in rupees; this ranking converts everything to US dollars, so a weaker rupee lowers IndiGo’s dollar figure even if its rupee revenue grows.
The same pattern shows up in Europe. Ryanair is 5th in the world by flights but 11th by revenue, while Lufthansa is 13th by flights and 4th by revenue. Low-cost carriers win on volume; network carriers with long-haul and premium traffic win on revenue per flight.
One caution: the two rankings cover different periods — flights for calendar 2024, revenue for Q3 2025 to Q2 2026 — so compare the ranks, not a per-flight number worked out from the two.
Who is missing
Because the list covers only listed companies, some very large airlines are absent. Emirates and Qatar Airways are both state-owned and unlisted, and both appear in the top 20 by flights. Air India, owned by the Tata group, is also unlisted and does not appear.
For investors
Revenue shows the size of a business, not whether it is a good investment. Airlines run on thin margins, and fuel prices, currency and demand can swing profits sharply from one year to the next. For InterGlobe Aviation’s price history and company details, see InterGlobe Aviation on CAPITA1.
This post explains a published ranking. It is not investment advice, and CAPITA1 is not a SEBI-registered investment adviser.
Frequently asked questions
Which airline has the highest revenue in the world?
Among listed airlines, Delta Air Lines, with $68.3 billion in revenue over the four quarters from Q3 2025 to Q2 2026, according to CompaniesMarketCap data charted by Visual Capitalist.
Where does IndiGo rank by revenue?
InterGlobe Aviation, IndiGo’s parent, is 22nd among the world’s listed airlines, with $10.0 billion in annual revenue.
Why is IndiGo ranked lower by revenue than by flights?
Because a flight count treats every departure the same. IndiGo mostly flies short, low-fare domestic routes, while airlines at the top of the revenue list sell many more long-haul and premium seats, each worth far more. Revenue is also reported here in US dollars, so it moves with the rupee.
Why aren’t Emirates or Qatar Airways on the list?
The ranking only includes publicly traded airlines. Emirates and Qatar Airways are state-owned and not listed, so they are left out even though both are large.