Schiphol-Bangkok is one of the busiest long-haul routes to Asia. Currently, approximately 31 flights depart per week, of which more than 11 are direct flights with KLM, as well as direct connections with EVA Air. The rest involve a layover, primarily via the Middle East with Emirates, Etihad, Qatar, or Oman Air, or via Asia with Singapore Airlines and China Airlines.
That competition makes prices volatile. Those who understand the logic of the seasons and use the right booking window can easily save hundreds of euros per person. Data from Google Flights, Momondo, Skyscanner, KAYAK, and CheapTickets show surprisingly consistent patterns, even though they sometimes contradict each other on details.
High season, low season and the Christmas peak
The Thai tourist high season runs roughly from mid-November to mid-February: dry, relatively cool, and with little rain. This is precisely the period when most Dutch and Belgians want to travel. Within that period, the Christmas holidays and New Year's, roughly from December 15 to January 5, form the absolute peak. Songkran, the Thai New Year around April 13 to 15, causes a second, shorter peak, especially on domestic flights.
The low season coincides with the rainy season, from May through October. July and August are exceptions due to the European summer holidays. September is usually the wettest, but also the quietest and cheapest time to fly. CheapTickets sees the cheapest tickets in March, September, and October, and the most affordable departure months in May, June, and September.
The prices per departure month
Based on multiple sources, the pattern for 2026 looks roughly as follows. The figures are indicative return prices in economy, including taxes, for the Amsterdam-Bangkok route.
| Departure month | Indicative price (return) | Hustle and bustle | Book preferably |
|---|---|---|---|
| January | € 550 - € 700 | High season, declining after January 7 | 3-5 months in advance |
| February | € 600 - € 750 | Peak season | 3-4 months in advance |
| March | € 650 - € 800 | High season, rising | 3-4 months in advance |
| April | € 750 - € 950 | Songkran and May holidays | 4-5 months in advance |
| Mei | € 550 - € 700 | Low season begins | 2-3 months in advance |
| June | € 550 - € 700 | Low season | 2-3 months in advance |
| July | € 750 - € 950 | Summer vacation | 4-6 months in advance |
| August | € 700 - € 900 | Summer vacation | 4-5 months in advance |
| September | € 500 - € 650 | Low season, quietest | 2-3 months in advance |
| October | € 550 - € 750 | Shoulder season | 2-3 months in advance |
| November | € 650 - € 850 | High season begins | 3-4 months in advance |
| December (15 Dec – 5 Jan) | €1.000 – €1.500+ | Absolute peak | 5-7 months in advance |
Actual prices fluctuate significantly by day and by airline, so view this as a guideline, not a guarantee.
How far in advance do you really need to book?
Research into the so-called Goldilocks Window shows that the best time for an intercontinental flight is generally between 2 and 8 months before departure. For Thailand, this works as follows in practice:
- Low season (May, June, September, October): Book 6 to 12 weeks in advance. Booking earlier is not necessary and can even end up being more expensive, as airlines only open their cheapest booking classes closer to the departure date. Skyscanner estimates the optimum at about 40 days before departure.
- High season (November to mid-December, January to March): Book 3 to 5 months in advance. During the KLM World Deal Weeks in January, many airlines open their cheapest classes for the upcoming winter season. Waiting until autumn often costs you 100 to 200 euros per person.
- Christmas and New Year's: Book 5 to 7 months in advance, so in June or July. Prices for December 22 to January 4 remain high for almost the entire year and do not drop further. Anyone hoping to score a last-minute deal in October or November often pays double.
- Summer holidays (July and August): Book 4 to 6 months in advance, no later than February or March.
KAYAK observes that travelers who book at least two weeks in advance already save about 21 percent compared to last minute. Going additionally warns that prices spike particularly 21, 14, and 7 days before departure.
Sources contradict each other.
Which departure month is exactly the cheapest? Sources differ on this. Google Flights, based on 12 months of its own search data for Amsterdam-Bangkok, names January as the cheapest month and April as the most expensive. Momondo Netherlands points to May, with an average of 588 euros return. Skyscanner sticks to May or June, depending on the reference point. CheapTickets mentions May, June, and September.
The differences can be explained: the platforms look at different periods, different booking classes, and different mixes of direct and indirect flights. What they all confirm, however, is that May, June, and September are structurally cheaper than December, July, and April. That signal is more valuable than the exact ranking.
Common mistakes and smart tips
A few pitfalls many travelers fall into:
- Waiting until the last moment during peak season. On this route, that “surely there’ll be a deal” rarely appears in November or December. Prices rise rather than fall.
- Booking too early in the low season. Booking a ticket for September as early as January often turns out to be more expensive than booking in June or July.
- Only check at Schiphol. Departing from Brussels, Düsseldorf, or Cologne sometimes saves tens to hundreds of euros, especially to Phuket.
- Compare directly without checking baggage. A ticket of 450 euros without checked baggage is more expensive than one of 550 euros with 23 kilos included.
- Forgotten that a transfer via the Middle East with Emirates or Etihad is regularly 150 to 300 euros cheaper than a direct KLM flight, for comparable comfort.
What does help? Set up a price alert on Google Flights, Skyscanner, or KAYAK six months before departure. Always compare Amsterdam, Brussels, and Düsseldorf; including the train, flying abroad is sometimes cheaper in net terms. Fly on Tuesday, Wednesday, or Sunday and preferably choose an evening flight. And for those wanting to go to Phuket or Koh Samui: fly to Bangkok and book a domestic connection with Thai AirAsia, Nok Air, or Bangkok Airways. Often cheaper and more flexible than a connecting ticket. Fuel prices, exchange rates, and potential new airport charges for 2026 could still shift the picture, but cannot be reliably estimated at this moment.
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The golden rule for flights to Thailand in 2026 remains simple: when you book weighs at least as heavily as when you fly. The low season requires planning 6 to 12 weeks ahead, the high season 3 to 5 months, and the Christmas peak 5 to 7 months. Do you see a reasonable price for your month? Book, and don't look back.
Sources: Google Flights, Momondo, Skyscanner, KAYAK, Expedia, CheapTickets.nl, Going, Dollar Flight Club, Thailandblog.nl
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