Finding cheap flights is an art — but with the right tools, anyone can save hundreds of euros per trip. We tested and compared the top flight search sites available for travellers. Here’s what we found.
1. Kiwi.com — Best for Creative Routing
Kiwi.com is our top pick for cheap flights, especially when your destination is flexible. Its Nomad algorithm combines flights from different airlines — including budget carriers — to build routes other sites can’t find.
- ✅ Combines flights from different airlines in one booking
- ✅ Free price alerts by email
- ✅ Kiwi Guarantee travel protection
- ✅ Excellent mobile app
- ❌ Service fees added at checkout
2. Aviasales — Fastest Price Calendar
Aviasales aggregates results from hundreds of airlines and travel agencies in seconds. It’s ultra-fast and shows a full monthly price calendar, making it easy to pick the cheapest travel dates.
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- ✅ Clean, fast interface
- ✅ Monthly price calendar view
- ✅ Free email and push price alerts
- ✅ Destination map by price
- ❌ Redirects to external sites to complete booking
3. Iberia — Best for Europe & Transatlantic
For travellers flying to European or American destinations, Iberia deserves special attention. As part of the IAG group (with British Airways and Vueling), it offers a massive route network through Madrid.
- ✅ Iberia Plus frequent flyer programme
- ✅ Madrid hub connects to worldwide destinations
- ✅ Regular promotions for Latin America
- ❌ Checked baggage fee on basic fares
4. CheapTickets — Best for Vacation Packages & US Travellers
Part of the Expedia Group, CheapTickets is one of the largest OTAs in North America and offers strong deals on flights, hotels and vacation packages — especially for transatlantic routes and Caribbean getaways. Its package bundling often beats booking flights and hotels separately.
- ✅ Flights + hotel bundle discounts (up to 30% off)
- ✅ Expedia inventory — millions of hotels worldwide
- ✅ Strong for US, Caribbean and Mexico routes
- ✅ Regular “Flights Under $149” promotions
- ❌ Less strong for Asia or budget airlines outside the US
Quick Comparison: Which Site to Use When
| Situation | Recommended Site |
|---|---|
| Flexible destination, cheapest option | Kiwi.com or Aviasales |
| Multi-destination trip / round-the-world | Kiwi.com (Nomad mode) |
| Direct flight Europe–Americas | Iberia |
| View full month price calendar | Aviasales |
| Earn miles and points | Iberia Plus |
| Vacation package (flights+hotel) | CheapTickets |
| US domestic or Caribbean | CheapTickets |
Tips to Find Even Cheaper Flights
- Search 6–8 weeks in advance for domestic and European flights
- Use incognito mode — some sites raise prices based on search history
- Fly early morning or late night — usually cheaper with fewer delays
- Set price alerts — both Kiwi and Aviasales offer free notifications
- Compare ±3 days — a 2-day shift can save 30–50%
Frequently Asked Questions
What’s the cheapest day of the week to fly?
Tuesday and Wednesday are generally cheapest. Friday and Sunday are most expensive. For weekend trips, consider flying Thursday–Sunday and returning Monday.
How far in advance should I book a flight?
European flights: 6–8 weeks. Transatlantic (Americas, Asia): 3–6 months. Long-haul international: 4–8 months. Avoid booking less than 2 weeks out unless you spot a last-minute deal.
Is Kiwi.com safe to book with?
Yes. Kiwi.com is EU-registered, has the Kiwi Guarantee programme protecting bookings against delays and cancellations, and processes payments securely. Over 50 million bookings processed to date.
See also: ultimate guide to finding cheap flights.
Sobre o autor — Rui Carreiro
Born in the Azores — literally in the middle of the Atlantic — Rui Carreiro spent 11 years working in the travel industry before turning that experience into a mission: making extraordinary travel accessible for everyone. He has visited 50+ countries, personally tested hundreds of deals, and researched 500+ destinations. Every guide, comparison and recommendation on this site is written, tested and signed by him. We earn affiliate commissions when you book through our links — at no extra cost to you.---Nascido nos Açores, Rui Carreiro acumulou 11 anos de experiência na indústria de viagens antes de criar o Traveler Whisper. Já visitou 50+ países e testou centenas de deals. Todos os guias e recomendações são escritos, testados e assinados por ele. Ganhamos comissões de afiliado quando reservas pelos nossos links — sem custo adicional para ti.
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