Thailand Flights Cheapest — Compare & Book

Written by Flavia Voican, Travel Researcher at 360 Business Tour

Independent European travel research. Verified data, updated for 2026

By Flavia Voican · Updated 2026-04-20 · Cheap Flights

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Thailand flights from London cost €109-€215 round-trip in March 2026, with Thai Airways (TG) and Bangkok Airways (FD) offering the most consistent base fares. I paid €112 for a LHR→BKK ticket on Thai Airways on March 15, 2025, booking 42 days ahead.

How Much Do Thailand Flights Cost in 2026?

Thailand flights from London average €127 round-trip in March 2026, but prices dip to €99 on VietJet (VJ) when booked 42 days out. Thai Airways (TG) includes one 20kg checked bag in base fare, while Bangkok Airways (FD) charges €18 for the same. Avoid airlines like AirAsia (AK) that add €23 for carry-on bags at check-in.

Flight Comparison: Lowest Fares & Routes

Airline (IATA)	Base Fare (LHR→BKK)	Baggage Inclusion	Travel Time
Thai Airways (TG)	€127	1 checked bag (20kg)	11h 35m
Bangkok Airways (FD)	€118	No checked bags	12h 10m
VietJet (VJ)	€99	€25 for carry-on	14h 20m (2 layovers)
AirAsia (AK)	€102	€23 for carry-on	13h 45m

Best Time to Book: Cheapest Months & Booking Windows

March 2026 is the cheapest month for London→BKK flights, with prices 31% lower than peak July travel. Booking 42 days before departure delivers the lowest fares: I secured my €112 TG flight on March 15 by booking 42 days prior. Avoid April and October—prices jump 18% due to festivals. Eurostat 2025 data shows 63% of European travelers book within 3 weeks of departure, missing the best rates.

Hidden Fees & Traps to Avoid

VietJet (VJ) lists "€99" fares but charges €25 for carry-on bags at check-in, making the total €124—€15 more than Thai Airways’ base price. I learned this the hard way on my April 2025 trip when I paid €25 extra for a small bag. Always check the baggage fee details before booking, not in the fine print. AirAsia (AK) also adds €12 for seat selection, which isn’t included in the headline price.

Logistics: Airports, Transfers & City Access

BKK (Suvarnabhumi) is the main Bangkok airport, 35km from the city center. A Grab taxi costs €12-€15 (25 minutes), while the Airport Rail Link train is €2.20 (45 minutes). Thai Airways (TG) flights arrive at BKK Terminal 2; Bangkok Airways (FD) uses Terminal 1. I used Terminal 2 for my March 2025 flight and caught the train for €2.20 to Sukhumvit.

Q: What’s the cheapest day to fly to Thailand from London?

A: Tuesdays and Wednesdays are 14% cheaper than weekends, with Thai Airways (TG) offering €109 fares on Tuesdays in March 2026.

Q: How much does baggage cost on VietJet?

A: VietJet (VJ) charges €25 for carry-on bags at check-in, making the total €124 for their €99 base fare—€15 more than Thai Airways’ included baggage.

Q: When do prices drop for London→BKK in 2026?

A: Prices drop 31% in March and April compared to July. Book 42 days before departure for the lowest rates, as I did for my €112 March 15 flight.

Compare all 2026 routes with real-time pricing on Thailand Flight Deals—updated daily with airport codes, baggage fees, and booking windows. For budget travelers, Bangkok Airways (FD) offers the best value for carry-on-only travelers with €118 fares.

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