Finding cheap flights isn’t complicated — but it does require knowing a few things most travellers don’t. These are the methods that consistently work, whatever your destination.
1. Use a Flight Comparison Tool as Your Starting Point
Never start with a single airline’s website. Start with a comparison tool that searches across hundreds of airlines and booking sites simultaneously. Trip.com lets you compare fares across airlines, switch cabin classes, and view prices across a full month — all in one search. Use it to establish the real market price before looking anywhere else.
2. Search Flexible Dates
The single most effective way to find cheaper flights is date flexibility. On almost every long-haul route, the same flight can vary by £100–£350 depending on which day of the week you depart. Use a month-view or calendar search to find the cheapest available days before fixing your dates.
3. Book in the Right Window
There’s a common misconception that booking as far in advance as possible gets the best price. It doesn’t. Airlines typically hold prices high when seats are plentiful and drop them as the flight fills in predictable patterns. For most long-haul routes, the optimal booking window is:
- International flights: 8–18 weeks before departure
- Peak holiday periods (Christmas, Easter, summer): 16–24 weeks ahead
- Low season: Even 4–6 weeks out can yield competitive fares
4. Fly Midweek
Weekend flights — particularly Friday departures and Sunday returns — carry a consistent premium because that’s when most leisure travellers want to fly. Tuesday and Wednesday departures are almost always cheaper. If you can shift your departure by even one day, it’s worth checking the price difference.
5. Consider Alternative Airports
Flying from a different airport can unlock meaningfully lower fares. If you’re in the UK, Heathrow generally has the most competitive long-haul pricing. If you’re in a city with a smaller regional airport, it’s worth comparing the total cost (including getting to a larger hub) against regional departure prices.
6. Set Price Alerts
Fares fluctuate constantly. A flight that’s £720 today might be £590 next week. Set up a price alert on Trip.com for your route and preferred date range, and you’ll be notified when prices drop. This approach works especially well when you’re 3–4 months from travel and have some flexibility on exact dates.
7. Check Low Season Dates
Destinations have seasons, and off-peak travel is consistently cheaper. For Thailand, May–September is low season — and fares from the UK can be £200–£400 cheaper than during the December–January peak. The trade-off in weather is often less severe than people expect: Thailand’s “rainy season” typically means an hour or two of afternoon rain rather than all-day storms. Read our Thailand Rainy Season guide for the full picture.
8. Don’t Overlook Stopover Routing
Sometimes the cheapest route from A to C is not a direct flight — it’s a slightly longer journey via B that costs meaningfully less. Stopover routing through Middle Eastern hubs (Doha, Dubai) or Asian hubs (Seoul, Taipei, Singapore) regularly offers savings of £100–£300 on long-haul routes to Asia.
9. Check the Total Price, Not Just the Headline Fare
A £299 headline fare that requires paying £80 per person for checked baggage costs £379. A £349 fare that includes 23kg checked baggage costs £349. Always check what’s included — baggage, seat selection, and flexibility for changes all affect the real price. Trip.com shows total costs including taxes and fees before you reach the checkout.
10. Book Direct with the Airline Once You’ve Compared
Use comparison tools to identify the best fare and airline. Then check whether booking directly through the airline’s own website changes the price or adds benefits (some airlines offer free seat selection or better baggage terms when you book direct). Sometimes the third-party and direct prices are identical — but it’s always worth the final check.
If You’re Flying to Thailand Specifically
These general principles apply even more sharply to Thailand routes. See our dedicated guides:
