Budapest Airport Layover: 100E Bus to the Thermal Baths for a Quick Soak Between Flights

It’s 3:45 PM on a Tuesday, and you have just touched down at Budapest Ferenc Liszt International Airport (BUD) on a Wizz Air flight from Abu Dhabi. The cabin smells of recycled air and the lingering paprika of a pre-landing stroganoff. Your connecting flight to Hong Kong (CX 70, departing at 10:30 PM) is still six hours away. You could sit in the sterile, carpeted transit zone, staring at the duty-free Toblerone pyramid. Or you could do something that, until recently, the Schengen transit rules made nearly impossible for non-EU passport holders: take a bus into the city, soak in a thermal bath, and be back at the gate with time for a pre-departure palinka.

The shift is real. In late 2023, Hungary updated its short-stay transit facilitation for select nationalities, and in 2024, the airport’s own marketing arm began actively promoting the “Budapest Break” — a formalised layover programme that cuts the bureaucratic friction for passengers holding confirmed onward tickets. For Hong Kong passport holders, who enjoy visa-free access to the Schengen area for up to 90 days, the legal hurdle was never the issue. The real barrier was logistics: how to get from the runway to a thermal bath and back, without a shower, a hotel room, or a panic attack over missing the re-boarding call. The answer is the 100E bus, a 40-minute ride, and a very specific bathhouse strategy.

The 100E Bus: The Only Transfer You Need

Why Not the Taxi or the Train

You will see the taxi touts as you exit the arrivals hall. They are aggressive, and their prices are opaque — expect HKD 350–450 for a one-way trip to the city centre. The 900E minibus to the city centre is slightly cheaper but drops you at Deák Ferenc tér, still a 15-minute walk from the baths. The train (CITY line from the airport to Kőbánya-Kispest) requires a transfer to the metro, adding 20 minutes of platform waiting time. For a layover, every minute counts.

The 100E is the direct line from BUD Terminal 2 to Deák Ferenc tér, running every 10 minutes during peak hours. The bus is operated by BKK (Budapest Közlekedési Központ), the city’s public transport authority. It uses dedicated bus lanes for the first 15 minutes of the journey, bypassing the notorious M0 motorway congestion. A single ticket costs 2,200 HUF (approximately HKD 50) as of 2025, payable by contactless credit card or the BudapestGO app on your phone. No Octopus card equivalent here — just tap your Visa or Mastercard on the validator.

The bus itself is a standard Iveco Crossway, upholstered in a depressing grey fabric. The air conditioning works, but inconsistently. Sit on the left side for a view of the Kispest housing blocks; the right side offers a glimpse of the Buda hills as you cross the bridge. The journey takes exactly 38 minutes if traffic is light, 48 minutes if it is not. Do not trust Google Maps’ estimate of 28 minutes — that assumes a magic carpet.

The Luggage Problem

You cannot take a full-size checked suitcase into a thermal bath. The lockers are small (40cm x 30cm x 50cm). BUD does not have a formal luggage storage service inside the transit zone — the “Left Luggage” office near Terminal 2A is a desk staffed by a single person, open 7:00 AM to 9:00 PM, charging 3,000 HUF per bag per day. But if your layover is 6 hours, you are paying for a full day.

The better solution is a hotel day-use locker. The Ibis Styles Budapest City (1075 Budapest, Király utca 3d) is a 5-minute walk from Deák Ferenc tér and offers day-use lockers for 1,500 HUF. No reservation needed. Alternatively, the Budapest Airport Business Lounge in Terminal 2B has shower facilities and small lockers for carry-on bags, but it is cramped and the coffee tastes like burnt barley. For the bath plan, pack a small daypack with a towel, flip-flops, and a swimsuit. Leave the hard-shell suitcase at the Ibis.

The Bath Strategy: Gellért vs. Széchenyi

Gellért: The Practical Choice

The Gellért Thermal Bath (1118 Budapest, Kelenhegyi út 4) is a 15-minute walk from Deák Ferenc tér, or a 5-minute tram ride on tram 47 or 49. It is housed in the Gellért Hotel, an Art Nouveau building that smells of chlorine and old plaster. The main indoor pool is 38°C, with a vaulted ceiling painted in a faded gold leaf pattern. The outdoor wave pool is 26°C — cold enough to wake you up but warm enough not to shock.

The key advantage for a layover: Gellért has a dedicated “quick soak” ticket, priced at 6,900 HUF (HKD 160) for 3 hours, including a locker and a shower. No sauna access, no thermal cave tour. You enter, change, soak for 90 minutes, shower, and leave. The changing rooms are cramped — prepare to straddle a bench while pulling on your swimsuit. The water has a distinct mineral taste if you accidentally swallow it; it is high in calcium and magnesium, which is why your skin will feel slick for hours afterward.

The downside: Gellért is popular with tour groups. Between 2:00 PM and 5:00 PM, the main pool is shoulder-to-shoulder with German pensioners and American college students. The 3-hour ticket is strict — you are charged 1,000 HUF for every 15 minutes over. Set a phone alarm.

Széchenyi: The Photogenic Alternative

Széchenyi Thermal Bath (1146 Budapest, Állatkerti krt. 9-11) is a 20-minute walk from Deák Ferenc tér, or a 10-minute ride on the M1 metro line to Széchenyi fürdő station. It is larger, brighter, and more photogenic — the yellow neo-baroque building with the outdoor pools is the image you have seen on Instagram. The water temperature in the main outdoor pool is 38°C, but the ambient air temperature in winter drops to -5°C, creating a thick steam layer that obscures the person three metres away.

For a layover, Széchenyi is less practical. The standard entry ticket is 9,400 HUF (HKD 215) for a full day, with no shorter option. The lockers are a maze — you will spend 10 minutes finding your row. The changing rooms smell of wet wool and chlorine. The main pool is 50 metres long, but the shallow end is packed with people standing in the water, arms crossed, staring at their phones. The deep end is where the serious soakers go: elderly Hungarian men playing chess on a floating board, submerged to their chests, moving pieces with the deliberation of a grandmaster.

If you choose Széchenyi, limit yourself to 90 minutes. The heat will dehydrate you faster than you expect. Drink water from the fountain near the entrance — it is free and potable.

Getting Back to the Airport

The Reverse Journey

The 100E bus runs from Deák Ferenc tér back to BUD every 10 minutes until 11:00 PM. The stop is the same one you alighted at. Buy your return ticket at the automated machine near the stop — it accepts coins and contactless cards. Do not try to buy a ticket on the bus; the driver will wave you off.

Allow 45 minutes for the return journey, plus 20 minutes for security re-screening. BUD’s security checkpoint at Terminal 2B has a dedicated lane for transit passengers, but it is poorly signed. Look for the blue sign that says “Átszálló utasok” (transit passengers). The average wait time at 7:00 PM is 12 minutes, according to a 2024 Budapest Airport operational report. If you are flying CX 70 to Hong Kong, the gate is usually at the far end of the pier, a 10-minute walk from security.

The Shower at the Airport

If you do not have time for the baths, the Budapest Airport Business Lounge (Terminal 2B, airside) has two shower rooms. They are clean, with a single-use towel pack and a small bottle of Hungarian-brand toiletries (the shampoo smells like apricot). The shower pressure is excellent — better than the Gellért changing rooms. But the lounge itself is small, with a maximum capacity of 80 people. At 6:00 PM, it is full. The food is limited to cold cuts and a soup that tastes like watered-down chicken stock. The coffee is from a self-service machine that dispenses a dark, bitter liquid. It is not worth the HKD 280 day-pass fee unless you desperately need a shower.

The Closing: Three Takeaways

1. Book the 100E bus ticket via the BudapestGO app before you land — the app accepts foreign credit cards, and pre-booking saves you the 5-minute queue at the machine.
2. Choose Gellért over Széchenyi for a layover — the 3-hour ticket is cheaper and the proximity to Deák Ferenc tér cuts your walking time in half.
3. Pack a swimsuit, flip-flops, and a microfiber towel in your carry-on — the airport does not sell swimwear, and the bathhouses charge HKD 80 for a towel rental.
4. Set a hard 3.5-hour limit for your city excursion — the return bus, security, and gate walk take at least 90 minutes total.
5. Do not eat at the bathhouse café — the Gellért café charges HKD 120 for a single slice of strudel that has been sitting under a heat lamp since morning. Eat a lángos from a street vendor near Deák Ferenc tér instead; it costs HKD 30 and is served fresh.