Flying to Frankfurt: Which Airport Is Actually Worth It?

The cheapest flight to Frankfurt is rarely the cheapest way to Frankfurt. It sounds like wordplay, but it’s the sum most visitors only start doing at the baggage belt — by which point it’s too late. Search engines and comparison sites cast a wide net these days: type in “Frankfurt” and you’ll be offered Hahn, Cologne/Bonn, Stuttgart, sometimes even Düsseldorf, and the gap to the FRA fare looks spectacular on screen. Whether it still looks spectacular after landing comes down to a single measure: the time and the money between the baggage hall and Frankfurt Hauptbahnhof.

That’s what this piece is about. Not which airport is the nicer one, but which one actually gets you into the city faster and for less — and where a nineteen-euro fare falls apart on contact with a thirty-euro transfer.

The sum that matters: door to door, not ticket to ticket

Before I go through the airports one by one, three rules I apply to every booking myself. First: always add the ground transfer for both directions. A €40 saving on the flight melts against €38 of bus tickets into a remainder you then pay for in hours. Second: multiply by the number of travellers. Budget-airline fares scale weakly per person; ground transfers scale linearly — for a party of four the maths almost always tips back to FRA. Third: check the last departure of the day, not the first. Nearly every nasty surprise in this comparison hangs on a service that turned out to be the final one at nine in the evening.

Throughout, the finish line is the same: Frankfurt Hauptbahnhof, because hotels, the trade-fair grounds and the old town are all minutes away from there.

FRA: the benchmark everyone else has to beat

Frankfurt am Main is the only one of these six airports genuinely in Frankfurt — about twelve kilometres from the centre. From the regional station beneath Terminal 1, lines S8 and S9 run every 15 minutes and reach the Hauptbahnhof in roughly 11 to 13 minutes; two minutes later you’re at the Hauptwache. A single ticket costs €6.90 (as of 2026), because the airport sits in a fare zone of its own and the cheaper city ticket doesn’t cover it. Which other services call at the regional station, and how to buy the right ticket, I’ve set out in detail in the piece on the S-Bahn from Frankfurt Airport.

One thing shifted in 2026 and it costs real minutes: since Terminal 3 opened on 23 April 2026 and Terminal 2 closed on 9 June, a great many airlines now land at a terminal a long way from the station. From Terminal 3 I’d budget a realistic 15 to 20 minutes to the platform — Sky Line across to Terminal 1 first, then down. All in, then: roughly 20 to 35 minutes and just under seven euros from arrivals hall to Hauptbahnhof. That figure is the yardstick for everything below. How taxis, ride apps and private transfers stack up beside it is covered in from Frankfurt Airport to the city centre.

Frankfurt-Hahn (HHN): 120 kilometres and a timetable built around flights

Hahn is the classic mis-booking, because the name says “Frankfurt” while the airport sits in the Hunsrück. Without a car there’s effectively no alternative to the flibco shuttle: the run to the coach station on the south side of the Hauptbahnhof (Stuttgarter Straße 26) takes around 2 hours 10 minutes, and online fares start at about €19 one way (as of 2026), so roughly €38 return per person. Where Hahn actually is, how the bus works in detail and who the airport genuinely suits is covered in the separate piece on Frankfurt-Hahn Airport.

For the decision here, one point dominates: the bus doesn’t run to a clock-face timetable but around flight times. There’s no plan B on rails, because Hahn has no railway connection at all. If your flight is delayed and the connecting coach has gone, you’re left with a taxi (three figures) or a wait. Quite how three-figure is spelled out by the distance and taxi fare from HHN into Frankfurt. Be honest with the arithmetic: about 2.5 hours and €19 per person each way, plus a risk no other airport in this comparison carries in quite such a concentrated form.

Cologne/Bonn (CGN): the serious challenger

Cologne/Bonn is the alternative that genuinely works, and the reason is the Cologne–Rhine/Main high-speed line. The airport has its own station right under the terminal area. From there the S19 runs roughly every 20 minutes on weekdays and reaches Köln Hauptbahnhof in a little under a quarter of an hour — and from Cologne the fastest ICE services take about 49 minutes to Frankfurt Airport’s long-distance station and around 63 minutes to Frankfurt Hauptbahnhof. A handful of ICE 49 services even call at the Cologne/Bonn airport station itself and run through to Frankfurt without a change, with the quickest journeys at about 1 hour 15.

Realistically, with luggage, the change in Cologne and a little slack, you’re looking at 2 to 2.5 hours. Price depends entirely on when you book: an early Sparpreis for the ICE leg starts in the low tens of euros, while the flexible walk-up fare costs several times that — and the S-Bahn ticket comes on top. Book the train only after you land and you’ve given away half the flight’s advantage. Book it at the same time as the flight and you have a genuinely good combination.

Stuttgart (STR): well connected, seldom actually cheaper

Stuttgart looks close on a map, and only partly is in practice. From Flughafen/Messe station, S-Bahn lines S2 and S3 reach Stuttgart Hauptbahnhof in 27 minutes, about every 15 minutes at peak times. From there, ICE services to Frankfurt take roughly 1 hour 15 to 1 hour 20. With the change and the wait, that’s a realistic 2.5 to nearly 3 hours.

There’s a wrinkle many travellers don’t know about: the planned long-distance station at Stuttgart Airport, and the commissioning of the new main station under the Stuttgart 21 programme, have been pushed back again. The promised direct link to the intercity network doesn’t exist yet — until it does, you go the long way round via the Hauptbahnhof, building site and all. Stuttgart earns its place if you have business in southern Germany anyway, or if the fare is dramatically lower. As a pure detour to Frankfurt it almost never adds up.

Karlsruhe/Baden-Baden (FKB): the special case with a bus-shaped gap

Baden-Airpark is small, friendly and growing again — Ryanair, Wizz Air and Eurowings have all expanded their 2026 programmes noticeably. The catch is on the ground. The airport has no station of its own; bus lines 205 and 215 link the terminal with Baden-Baden station in roughly 20 to 30 minutes at the ordinary KVV fare of a few euros. The timetable, though, is thin and patchy at the edges of the day — check it on kvv.de before you book the flight, not after.

From Baden-Baden it’s about 1 hour 30 by ICE to Frankfurt, though not every train on the Rhine valley line stops there. All told you’re realistically travelling for close to 3 hours. For travellers from Baden, FKB is a real win. For a weekend in Frankfurt it’s a detour that only works with a truly unbeatable fare.

Düsseldorf (DUS): only if the flight is unanswerable

Düsseldorf makes this list because search engines occasionally suggest it — and because, contrary to its reputation, it doesn’t do badly. The SkyTrain takes seven minutes from the terminal to the long-distance station and runs every five to seven minutes between roughly 03:45 and 00:45. Plenty of ICE services head south from there; the fastest reach Frankfurt Airport in a little over 1 hour 15, with the average nearer an hour and a half, and the Hauptbahnhof correspondingly later. With the change and some slack you land at 2 to 2.5 hours — and you pay a full long-distance fare for it unless you secured a Sparpreis early. In short: Düsseldorf is no disaster, but it stops being a bargain the moment the train is added.

What this comparison deliberately doesn’t cover is the walking inside each terminal — where security sits at Cologne/Bonn, how far it is from check-in to the gate at Stuttgart, which level is which at Düsseldorf. For that I look up Abfluglotse, our partner publication, which sets out the terminals and departure routes at the other German airports in detail; for Frankfurt itself our own map of all FRA terminals does the job.

The three risks that eat the saving

The last bus. At HHN and FKB, ground services stop earlier than budget airlines land. An arrival at 22:40 can mean a three-figure taxi or an airport hotel. At CGN, STR and DUS there are at least late or early services in the area — but even there the final ICE to Frankfurt has often gone before midnight.

The missed connection. A train ticket is tied to a specific service the moment it’s a Sparpreis. If your flight lands 90 minutes late, that cheap ICE out of Cologne is void. Allow at least 75 to 90 minutes between scheduled landing and train departure — or book flexible and pay more.

The luggage and the head count. Two changes with a pushchair, two suitcases and a tired child is a different proposition from the same route alone with a rucksack. And four rail tickets from Cologne cost enough that the flight’s advantage usually disappears on paper.

What I’d tell whom

• Weekend visitor, light luggage, alone or as a pair: FRA, if the premium is under roughly €40. Above that Cologne/Bonn becomes interesting — but only with an early Sparpreis and a flight that lands before 20:00.
• Business trip with a fixed appointment: FRA, no argument. Twenty minutes into town, ICE platforms in the building, and a taxi as the fallback. Anything else gambles a meeting to shave an expense line.
• Family with children and cases: FRA, almost without exception. Every euro saved on the flight is repaid twice over across four ground tickets.
• Night arrival after 22:00: FRA — the S-Bahn runs through the night at weekends, and even a taxi stays affordable. Hahn and Baden-Baden are simply not options for a night landing if you still need to reach Frankfurt.
• You’re travelling on to Cologne, Stuttgart or the Rhineland anyway: turn the question round and fly into whichever airport sits closest to your second destination — then use Frankfurt Airport’s long-distance station on the way back.

Laying it all side by side leaves an unspectacular conclusion: Frankfurt am Main has one of the best-connected airports in Europe, and that head start is hard to beat. Eleven minutes on the S-Bahn for €6.90 is a bar that two hours on a coach for €19 simply doesn’t clear. The only challenger I take seriously is Cologne/Bonn, and even then only with a train ticket bought at the same moment as the flight. Everything else pays off mainly if you live nearby anyway, or if you’ve landed a fare that blows up the whole calculation. And if you do end up at Hahn: take the earlier bus. The later one fails to run more often than you’d like.