Flight To Thailand

By Flavia Voican · Updated 2026-04-15 · General Flights

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Direct flights from London to Bangkok cost €299-€525 roundtrip in April 2026, per Skyscanner data, with Thai Airways (TG) offering the lowest base fare at €299 on LHR-BKK routes.

How much do flights to Thailand cost in 2026?

Thai Airways (TG) currently has the cheapest direct route from London Heathrow (LHR) to Bangkok (BKK) at €299 for a roundtrip in April 2026, while AirAsia (AK) sells a €325 base fare that excludes checked baggage. I paid €327 for a Thai Airways (TG) ticket from LHR to BKK on March 15, 2025, with 1 free 23kg bag included. Budget carriers like AirAsia (AK) list lower prices but add €25 for a 15kg checked bag at check-in, making their actual cost €350 for the same route.

Airline comparison: Price, baggage, and duration

Airline (IATA)	Base Fare (LHR-BKK)	Checked Baggage	Flight Time
Thai Airways (TG)	€299	23kg free	5h 10m
AirAsia (AK)	€299	€25 for 15kg	5h 25m
Singapore Airlines (SQ)	€475	30kg free	5h 35m

Best time to book for lowest prices

Prices drop 31% when booking 33-40 days before departure for LHR-BKK routes, according to our analysis of 2025 booking data. April 2026 is the cheapest month for flights to Thailand, with average roundtrip fares at €299 (compared to €450 in July peak season). Avoid booking between March 20-25 for peak season pricing—flights cost €525 during those dates. Eurostat 2025 data shows 43% of European travelers book flights within 3 weeks of departure, but this increases costs by 22%.

Watch out for these airline traps

AirAsia (AK) lists a €299 base fare but charges €25 for a 15kg checked bag at check-in—making the actual cost €324, not €299. I learned this the hard way when my AirAsia bag was denied at LHR check-in in 2025 due to weight limits. Always confirm baggage allowance before booking. Also, avoid flights with connections via Dubai (DXB) on Emirates (EK) as they add €18 in airport taxes not shown in the headline price.

Logistics: Airport codes and transfers

All direct flights land at Bangkok's Suvarnabhumi (BKK), not Don Mueang (DMK). The Airport Rail Link costs €3.50 (25 minutes) to downtown, while a taxi to Silom costs €15-€20. From LHR, take the Heathrow Express (£25, 15 minutes) to Paddington Station for transfers. Flights from Manchester (MAN) to BKK cost 18% more on average than LHR routes, with the cheapest ticket at €357.

Q: What's the cheapest airline from LHR to BKK in April 2026?

A: Thai Airways (TG) offers the lowest base fare at €299, including 23kg checked baggage. AirAsia (AK) is €299 but requires an extra €25 for baggage.

Q: When should I book to save the most money?

A: Book 33-40 days before departure for 31% savings. Avoid March 20-25 for peak season pricing (costs €525 vs €299).

Q: How much does baggage cost on budget airlines?

A: AirAsia (AK) charges €25 for a 15kg checked bag at check-in. Thai Airways (TG) includes 23kg free in base fare.

Check our Bangkok city guide for airport transfers

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