London → Bangkok (LHR–BKK): direct or via the Gulf, and Thailand's new 30-day rule

The cheapest London–Bangkok fare on any given day usually has a stop in it. The question is whether the saving is worth an extra five to eight hours door to door, and the answer changes depending on who you are. Then there’s the other thing that changed this autumn: if you last went to Thailand in 2025, you had 60 days visa-free. Now it’s 30.

First, the geometry. Heathrow and Suvarnabhumi are 9,578 km (5,951 mi) apart on a great circle, computed from our airport coordinates. Our LHR–BKK route page estimates about 12 hours at a flat 800 km/h. Real eastbound schedules beat that thanks to tailwinds: Thai Airways’ TG911 is scheduled at about 11h30. The westbound TG910 home is scheduled at 12h45.

Direct or via the Gulf? A three-question test

At the time of writing, two airlines fly Heathrow–Bangkok non-stop: Thai Airways, twice a day, and EVA Air, once a day on a flight that continues to Taipei, according to FlightsFrom’s schedule data. British Airways is back in Bangkok, but from Gatwick, with frequency that varies by season. Our route page shows the historical OpenFlights list, which includes carriers that have since dropped the route.

The one-stop alternatives are plentiful: Emirates via Dubai, Qatar Airways via Doha (around five to six Doha–Bangkok flights a day), Etihad via Abu Dhabi (four a day) and Turkish Airlines via Istanbul.

Ask yourself three things:

1. Are you travelling with children, or straight into a work meeting? Take the non-stop. Twelve hours is long; a connection at 02:00 in a Gulf hub with a tired toddler is longer.
2. Is the saving bigger than a night’s hotel? If a connection saves less than the cost of a Bangkok hotel night, it’s rarely worth the extra hours. If it saves several hundred pounds per person, it might be.
3. Do you want the stop? A Dubai or Istanbul stopover, built into the ticket, turns the trip into two holidays. That’s a different calculation altogether.

To see the non-stops and connections side by side for your dates, Skyscanner Partner is handy; filter by “direct only” first to see what the premium actually is.

What one stop costs you in kilometres

The hubs aren’t wildly off-line, which is why connections can compete on price. The extra distance is modest; the real cost is the layover.

In other words, a Gulf connection adds roughly 800–950 km of flying, about an hour in the air, plus however long you sit at the hub. Price it in hours as well as pounds.

The 30-day rule, and the two-entry catch

On 15 September 2026, Thailand cut its standard visa-exempt stay from 60 days to 30 for around 60 nationalities, including the UK, the US and Canada, as ITIJ reported. The Foreign Office’s Thailand entry requirements page confirms it for British citizens: up to 30 days, for tourism only.

Three details matter more than the headline:

• Two land entries a year. The Foreign Office says visa-exempt tourist entry through land-border checkpoints is normally limited to two per calendar year, and that this generally doesn’t apply to arrivals by air. If your trip includes overland hops from Malaysia, Laos or Cambodia, count them, and get a visa or ask the Thai embassy rather than guessing.
• One extension. You can apply once at an immigration office for up to 30 more days, at the officer’s discretion. Don’t build a 50-day itinerary around an extension you haven’t been granted.
• Tourism only. Business meetings and conferences aren’t covered by the exemption, per the Foreign Office.

The usual entry conditions still apply: a passport valid for at least six months from arrival with a blank page, and potentially proof of at least 10,000 baht per person (20,000 per family). Officers rarely ask, but have a banking app ready.

TDAC: the form you fill in at the gate

The Thailand Digital Arrival Card has replaced the old paper TM6 for all foreign arrivals, children included. It’s free on the official site, tdac.immigration.go.th, and must be submitted within three days before arrival, counting arrival day. Each entry needs a new one.

For a Heathrow departure that lands the next day, that means doing it any time from two days before you fly. The gate at Heathrow is a perfectly good place. Screenshot the QR code in case the Wi-Fi at the immigration hall is slow. If you’re only transiting through Bangkok without leaving the airport, you don’t need one.

Lookalike TDAC sites that charge a “service fee” are everywhere in search results. The real one costs nothing.

Landing at Suvarnabhumi

Arrival times. Thai flies from Heathrow Terminal 2. Until the UK clocks change, TG911 leaves at 12:30 and lands at 06:00 the next morning; TG917 leaves at 21:25 and lands at 15:00. The winter timetable from late October shifts the departures to about 11:50 and 21:35, so check your booking. The afternoon arrival is kinder: a few hours of daylight, then a proper night’s sleep. The dawn arrival leaves you with hours before hotel check-in, which is worth paying an early check-in fee to avoid.

Immigration. Suvarnabhumi’s automated gates now accept 33 nationalities, including British passport holders, but first-time visitors must still use a staffed counter for biometric capture, and the rollout is phased.

Into the city. The Airport Rail Link runs from the terminal basement to Phaya Thai in about 27 minutes for 15–45 baht, between 05:30 and midnight. Metered taxis leave from the official rank on the ground floor; insist on the meter. Pick a hotel near a rail station and you’ll use it all week. Booking.com Partner has a map view that makes that easy.

Our Suvarnabhumi airport page has terminal details.

Money, plugs and the clock

• Baht and cards. Malls, hotels and chain restaurants take cards; street food, markets and tuk-tuks want cash. Check the ATM screen for a local operator fee before you confirm, and check what your own card charges for cash abroad; our money cards comparison covers the options. Today’s GBP–THB rate is on our currency page.
• Plugs. Thailand uses Types A, B, C and O at 230 V. UK three-pin plugs won’t fit most sockets, so pack an adaptor; no voltage converter is needed.
• The clock. Bangkok is UTC+7 all year. That’s six hours ahead of London until the UK’s clocks go back on 25 October 2026, then seven. Eastbound over six or seven zones is the harder direction for most people, so get morning daylight on day one and expect a couple of foggy afternoons.
• Data. A Thailand eSIM installed before you fly means Grab and maps work at the kerb; local SIMs are also sold in arrivals.

Coming from the Gulf instead? Our Dubai–Bangkok checklist covers that leg. For holidays, costs and entry rules in one place, see our Thailand country page.