“Biggest airline in Europe” depends on what you measure. By passengers carried, three groups sit clearly at the top of the European ranking in recent years: Ryanair Group, Lufthansa Group, and International Airlines Group (IAG). Revenue and market value tell a slightly different story — but if you care about who moves the most people across the continent, start here.
Figures below follow published group passenger totals for calendar 2025 (Ryanair ~206 million; Lufthansa Group ~135 million) and the long-running third place for IAG’s combined brands. Treat them as order-of-magnitude, not a betting sheet — groups restate fleets and brands, and year boundaries differ.
For live Norway hops that feed into these networks, keep the flight board open when status labels start moving.
1. Ryanair Group — Europe’s passenger machine
Listed company: Ryanair Holdings plc
Primary ticker: RYA.IR (Euronext Dublin) · US ADR often seen as RYAAY
Ryanair is not a classic flag carrier. It is a low-cost network built for frequency, secondary airports, and ruthless schedule discipline. The group also includes brands such as Buzz, Lauda Europe, and Malta Air under the same holding company. In passenger volume it has led Europe for several consecutive years — the gap to #2 is larger than many mid-size groups’ entire annual traffic.
What that means for travellers: cheap base fares, paid extras, early check-in discipline, and a board that rarely cares about your city-centre preference. When a Ryanair leg is the thin strand in a Norway trip, watch the Avinor-powered board and the airline app the same morning — low-cost irregular ops still cascade into missed connections.
2. Lufthansa Group — the multi-hub premium stack
Listed company: Deutsche Lufthansa AG
Primary ticker: LHA.DE (Xetra)
Lufthansa Group is Europe’s largest full-service network operator by passengers. Brands under the umbrella include Lufthansa, SWISS, Austrian Airlines, Brussels Airlines, Eurowings, and leisure/regional units such as Discover and Edelweiss. Hubs in Frankfurt, Munich, Zurich, Vienna and Brussels feed long-haul and dense European traffic inside Star Alliance.
What that means for travellers: more connection products, more bag-through options on allied tickets, and more exposure to hub weather and ATC delays. A late inbound into FRA or MUC can still ruin a same-day Norway domestic hop if you cut buffers thin.
3. IAG — British Airways, Iberia and the Atlantic spine
Listed company: International Consolidated Airlines Group, S.A.
Primary tickers: IAG.L (London) · also listed as IAG.MC (Madrid)
IAG is the holding company behind British Airways, Iberia, Vueling, Aer Lingus, and related loyalty/ops units. It is usually Europe’s third-largest group by passengers and a heavyweight on North Atlantic and Spanish/UK traffic. One ticket under a BA flight number may still operate as Iberia metal (and vice versa) — always read the operating carrier.
What that means for travellers: strong long-haul + short-haul combinations through London and Madrid, plus Vueling for point-to-point leisure. If your Norway itinerary only touches IAG on the long-haul into Europe, protect the domestic Norway sector with real slack, not PDF optimism.
Honourable mention: Air France–KLM
Just behind the podium sits Air France–KLM SA (AF.PA on Euronext Paris) — Air France, KLM, and Transavia under one group. It is often #4 by passengers and still enormous on hub connectivity via CDG and AMS. If you rank by alliance geography rather than headcount, it belongs in the same conversation.
Quick compare
| Rank (passengers) | Group | Flagship brands | Stock page |
|---|---|---|---|
| 1 | Ryanair Holdings | Ryanair, Buzz, Malta Air… | RYA.IR |
| 2 | Lufthansa Group | LH, LX, OS, SN, EW… | LHA.DE |
| 3 | IAG | BA, Iberia, Vueling, EI… | IAG.L |
| — | Air France–KLM | AF, KL, Transavia | AF.PA |
Market cap rankings can shuffle this order — Ryanair often leads European airline valuations, while Air France–KLM’s market value is much smaller despite huge traffic. Passenger volume ≠ share price.
How to use this on a Norway trip
These groups show up as feeders into OSL, BGO, TRD, TOS and SVG as much as they show up on stock screens. When your inbound is Ryanair into a secondary airport, or Lufthansa into a hub connection, the useful habit is the same: check status early, protect the domestic leg, and confirm the operating airline on the boarding pass — not only the marketing brand.
Stock pages above are for context and research via StockMarketCap.eu; they are not investment advice. Browse the airlines sector for more carriers by market cap.