The best flight search engines are Google Flights, Skyscanner, Kayak, and Momondo — but they work better together than as standalone tools. Start with Google Flights for most searches, cross-check on Skyscanner, and use Kayak if you want hotels and cars bundled into the same comparison. Each has genuine strengths and blind spots, and using more than one costs nothing. Here’s a practical breakdown of how they actually differ.
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Google Flights
Google Flights is the most useful starting point for most searches. It’s fast, the calendar view makes date flexibility easy to visualize, and the price tracking feature sends you an alert when fares drop on a route you’ve searched. The map view is particularly good if you’re flexible on destination and want to see what’s cheapest from your home airport across an entire region.
One limitation worth knowing: Google Flights doesn’t always surface budget carriers like Spirit or Frontier depending on the route. If you’re specifically looking for ultra-low-cost options, check those airlines’ sites directly after running your Google search.
Skyscanner
Skyscanner is worth using alongside Google Flights because it tends to surface a wider range of carriers, including smaller regional airlines that don’t always show up in Google’s results. The “search everywhere” feature is useful if you’re open on destination. It maps out the cheapest fares from your departure city across hundreds of destinations at once.
Skyscanner also lets you search an entire month’s worth of dates and shows cheapest days in a grid format. For flexible travel, that’s one of the better interfaces available. The downside is that some “cheap” results redirect you to third-party booking sites that add fees at checkout. Always compare the total against booking direct with the airline.
Kayak
Kayak aggregates flight results similarly to Skyscanner but also pulls in hotels and car rentals, which makes it useful if you want to compare the full trip cost in one place. Its price forecast tool (which tells you whether historical data suggests fares will go up or down) is occasionally useful, though not infallible.
Kayak is also good for searching flexible dates. The calendar view shows the cheapest fares across a range, similar to Google Flights. For flight-only searches, Google Flights is generally faster and cleaner. Kayak earns its place when you want a bundled view of the whole trip.
Momondo
Momondo is worth a check for international routes, particularly transatlantic and routes into Europe. It sometimes surfaces combinations or carriers that the larger aggregators miss, and it has a clean interface that makes comparing options straightforward. It’s not a replacement for Google Flights or Skyscanner, but running a quick Momondo search on international routes before booking is a low-effort cross-check.
Going (Formerly Scott’s Cheap Flights)
Going works differently from the others. It’s an email newsletter and app that alerts you when fares from your home airports drop significantly below their usual range. You’re not searching for a specific trip; you’re getting notified about deals and then deciding whether to book. The free tier covers a limited number of airports; the paid tier gives you full access.
If you travel opportunistically and have flexible dates, Going is worth trying. It won’t help you plan a specific trip with fixed dates, but it’s the best tool available for finding genuinely below-average fares when you don’t have a set destination in mind.
How to Actually Find Cheap Flights
The tool matters less than the strategy. A few things that consistently work:
- Be flexible on dates. Fares vary dramatically by day of week and time of day. Midweek departures (Tuesday, Wednesday) are typically cheaper than Friday or Sunday. The price calendar view in Google Flights makes this easy to see at a glance.
- Check nearby airports. Flying into a secondary airport 60 miles from your destination is often significantly cheaper, especially in Europe. Factor in ground transport costs before assuming it’s worth it.
- Book direct with the airline for the best customer service. Third-party booking sites are fine for comparing prices, but booking direct means the airline can help you quickly if something goes wrong with your trip.
- Set price alerts and wait. If you’re not booking urgently, set an alert on Google Flights or Kayak and check back over a few weeks. Fares fluctuate and rarely follow a predictable pattern.
- Don’t assume the aggregator has the cheapest price. Some airlines, particularly budget carriers, don’t list on aggregators at all. After you find a fare, check the airline’s site directly to confirm the price and avoid booking fees.
For more on booking strategy, see our guide to the best places to buy plane tickets.
Best Flight Search Engines: Frequently Asked Questions
Which flight search engine is best?
Google Flights is the best starting point for most searches. It’s fast, has a good calendar view for flexible dates, and offers price tracking. Cross-check results on Skyscanner to catch carriers that Google sometimes misses, especially on international routes.
Is it cheaper to book directly with the airline?
Sometimes yes, sometimes no. Aggregators are useful for comparing options, but the final price booked through a third party can include booking fees. Always check the airline’s site directly after finding a fare on an aggregator. Direct booking also gives you better customer service if something goes wrong.
Do flight prices go down closer to departure?
Sometimes, but it’s not reliable enough to plan around. Last-minute fares can be high on popular routes when seats are scarce. The best fares on most domestic routes tend to appear 1 to 3 months before departure. Setting a price alert and monitoring is more effective than trying to time the market.
What is Going (formerly Scott’s Cheap Flights)?
Going is an email service and app that alerts subscribers when fares from their home airports drop significantly. It’s not a search engine for planning a specific trip. It’s a deal alert service for flexible travelers. A free tier is available; the paid tier covers more airports and deal types.
Does Skyscanner show all airlines?
Skyscanner covers a very wide range of carriers including many budget and regional airlines. It doesn’t include every airline universally. Some carriers don’t participate in third-party aggregators. After finding a route, it’s worth checking the airline’s own site as a comparison.
Is Kayak better than Google Flights?
For flight-only searches, Google Flights is generally faster and cleaner. Kayak’s advantage is that it also aggregates hotels and car rentals, making it useful for comparing full trip costs in one place. Most experienced travelers use both.