Quick summary
Our 14 October 2026 fare scan found London–Kuala Lumpur round-trip economy from €450, with the same-day departure returning 30 October priced at €689. The split-ticket case has weakened: Austrian Airlines fares from Vienna to Bangkok now start at €694, so the long-haul leg alone costs more than a full through fare.
The caveat sits on the short leg. AirAsia’s Bangkok–Kuala Lumpur base fare is THB 1,999–2,499 (€50–63) booked 30–60 days out, and a 20kg bag adds THB 800–1,200. Below: the transfer between Bangkok’s two airports, and the baggage rules that decide the split.
On 14 October 2026, our fare scan priced a London–Kuala Lumpur round-trip economy departure for that same day at €689, returning 30 October. That fare resets the benchmark for the split-ticket trick this page used to recommend. The old case rested on a cheap long-haul leg to Bangkok. That leg now costs more on its own than a full through fare from London.
For travelers departing Europe, the question is whether two separate tickets, an airport transfer and a checked bag still cost less than one ticket to Kuala Lumpur.
The cheapest fare is not the whole cost. The split has to leave room for the journey across Bangkok and the baggage charges on the second ticket.
What the current Europe–Kuala Lumpur fare picture actually shows
The 14 October scan priced 19 London–Kuala Lumpur round trips in economy. The floor was €450 on a one-stop routing. That trip departed 11 January 2027 and returned 18 January, a week later. The ceiling was €958.
The highest fare departed 20 December and returned 3 January on a three-stop routing. Timing did most of the work, though routing and timing are tangled in this data set. The four cheapest fares were all one-stop, but the highest fare also left just before Christmas, so the routing penalty cannot be separated from the Christmas premium.
Late October and early November departures sat close to the floor: 28 October at €453 and 13 November at €467, both one-stop. The same-day departure had two stops. Booking that identical trip in mid-January instead of mid-October saves €239.
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Why the old Vienna–Bangkok fare anchor no longer holds
This page used to argue that a cheap Vienna–Bangkok round trip made the split a near-certain win. That anchor is gone. As of October 2026, Austrian Airlines fares from Vienna to Bangkok start at €694.
The old arithmetic was simple: a cheap long-haul leg to Bangkok, a short low-cost hop to Kuala Lumpur, and enough left over to cover a transfer and a bag. The long-haul leg, not the short hop, is now the expensive half of any split.
The Vienna–Bangkok leg alone starts €244 above the cheapest London through fare. The origins differ, and a Vienna-based traveler cannot book the London fare. Even with that limit, the direction is clear.
Kuala Lumpur already undercuts Singapore as a European entry point, which is why the destination is worth pricing at all. If Bangkok no longer works as the split point, routing Europe–Malaysia flights through China is the other option on the table.
The Bangkok airport transfer: BKK to DMK
Full-service carriers land at Suvarnabhumi (BKK). AirAsia’s Bangkok–Kuala Lumpur flights leave from Don Mueang (DMK), 45 kilometres away. No shuttle bus connects the two airports.
The workable route is the Airport Rail Link from Suvarnabhumi to Phaya Thai, 30 minutes for THB 45. A taxi from Phaya Thai to Don Mueang takes another 30 minutes and costs THB 300–400. That is an hour of moving before immigration queues, baggage claim or check-in enter the picture.
AirAsia’s counters at Don Mueang close 60 minutes before departure. The airline recommends checking in two hours ahead for an international flight. The gap between flights is set by the second ticket, not the first.
Low-cost leg and baggage rules that decide the split
AirAsia’s Bangkok–Kuala Lumpur base fares run THB 1,999–2,499 (€50–63) when booked 30–60 days ahead. Inside 48 hours they climb above THB 4,999 (€125+). The short leg is cheap only when booked early. Late planners pay more.
Baggage adds another charge. A 20kg checked bag costs THB 800–1,200 (€20–30) when added online. At airport check-in, the same bag costs THB 1,500–2,000 (€38–50). That is 40–50% on top of the base fare, and up to THB 800 more for buying the bag at the counter.
The bag also cannot be checked through. Two tickets are two contracts, so it is tagged only as far as Bangkok. AirAsia’s conditions of carriage set out the allowances and counter deadlines.
The same arithmetic runs in reverse on a Kuala Lumpur–Bangkok–Europe return: the short hop is the cheap part, and the long-haul sector out of Bangkok decides the total.
How the new fare floor changes the decision
A split now has to clear a much wider gap than it did a year ago. Price the through fare from your own city first, then the two separate tickets; Austrian’s Vienna–Kuala Lumpur page is the same exercise for a Vienna departure.
Travelers with checked bags. Collect the bag at Suvarnabhumi, carry it across Bangkok and check it in again at Don Mueang. With a checked bag on both legs, the short leg stops being the cheap part of the trip; paying the counter rate adds more. Less suited: a two-week trip that needs a checked bag in both directions.
Carry-on-only travelers. The base fare plus the rail link and taxi at THB 345–445 is the whole short-leg cost. That version of the split has room to spare because the short leg is small next to a long-haul fare. Less suited: anyone who cannot book a month ahead, when the late-booking price rise erodes that room. Count backwards from your Kuala Lumpur departure time rather than forwards from your Bangkok landing time.
Travelers locked into late December. Moving a Christmas trip into mid-January saves €508 on the through fare alone, more than any split can recover. Less suited: school-holiday travelers who cannot move their dates.
Watch the Austrian Vienna–Bangkok page for an end date on the fare: if it is a launch price, the split’s arithmetic changes again.
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Questions? Answers.
How do I transfer between Bangkok’s two airports safely?
Take the Airport Rail Link from Suvarnabhumi to Phaya Thai (30 minutes, THB 45), then a taxi to Don Mueang (30 minutes, THB 300–400). No shuttle bus links the airports, which are 45 kilometres apart. AirAsia’s Don Mueang counters close 60 minutes before departure, so count backwards from your flight time rather than forwards from your landing time.
Can I check baggage through on split tickets?
No. Two tickets are two contracts, so your bag is tagged only as far as Bangkok. You collect it at Suvarnabhumi, carry it to Don Mueang and check it in again. AirAsia charges THB 800–1,200 (€20–30) for a 20kg bag added online, or THB 1,500–2,000 (€38–50) at the airport counter — a gap of up to THB 800 for the same bag.
What happens if my Bangkok arrival flight delays and I miss the Kuala Lumpur connection?
Nothing is protected. Two separate tickets mean neither airline owes you a rebooking, a refund or a hotel, so the cost of a missed short leg falls on you. That risk is what the split’s saving has to cover, which is why the through fare is the number to beat rather than a figure to beat by a few euros.
When should I book Bangkok–Kuala Lumpur flights to get the lowest fares?
Booked 30–60 days ahead, AirAsia’s base fares run THB 1,999–2,499 (€50–63). Inside 48 hours they pass THB 4,999 (€125+). Book the long-haul leg first, then the short leg as soon as your Bangkok arrival time is fixed, because the short leg’s price is the one that moves fastest.
