Thailand Flights Cheapest — Compare & Book
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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Flavia Voican
Travel entrepreneur & founder of 360 Business Tour. Writing about flights, destinations, and travel hacks since 2011.