Going

Short answer: start with Google Flights, then cross-check with Skyscanner or KAYAK. No single flight search engine finds every fare every time, so the best workflow is usually: Google Flights → Skyscanner/KAYAK → airline site to book.

Top flight search engines people actually use

My practical recommendation

For most travelers:

1. Start with Google Flights to find the best dates, airports, and airlines.
2. Check Skyscanner if your destination or dates are flexible.
3. Check KAYAK or Momondo to see if smaller OTAs or mixed-ticket options beat the Google price.
4. Book directly with the airline when the price is the same or close. Use Expedia/Priceline only when the savings, bundle value, or rewards are worth the extra third-party complexity.

Best by use case

• Best overall: Google Flights
• Best for “I can go anywhere”: Skyscanner
• Best for filters and price cross-checking: KAYAK
• Best for finding weird lower fares: Momondo
• Best for packages: Expedia
• Best flight app for price predictions: Hopper
• Best for power users: ITA Matrix by Google — great for advanced fare research, but not user-friendly and not for booking.
• Best deal-alert service, not a search engine: Going / Scott’s Cheap Flights-style services. Going’s own guide says it often directs members to Google Flights, KAYAK, Skyscanner, Priceline, and Momondo when they’re ready to book. (going.com)

I'll search for recent rankings and user recommendations on the top flight search engines.To get more detailed comparisons and confirm popularity, I'll review a couple of the top review articles.Google Flights, Skyscanner, Momondo, and Kayak stand out as the top flight search engines (metasearch/aggregators) that people actually use most often, based on expert tests, travel sites, and user discussions on forums like Reddit.

These tools scan airlines and online travel agencies (OTAs) to compare prices rather than (usually) selling tickets themselves. Results can vary by route, dates, and whether you need budget carriers, flexibility, or specific features, so savvy travelers check 2–3 and then often book directly with the airline for better customer service, easier changes, and to avoid third-party issues.

Top Recommendations

Here’s a breakdown of the leading options, drawing from recent comparative testing (e.g., Frommer’s extensive 2026 tests of prices on dozens of itineraries) and popular usage:

1. Momondo (often ranks #1 for cheapest fares)
   Excellent at finding the lowest prices overall (strong on both last-minute and advance-purchase). Standout feature: It factors in baggage fees on the results page via a “Fee Assistant,” which most competitors don’t do as effectively. Great visuals, filters, price alerts, and advice on whether to book now. Owned by the same company as Kayak. Ideal as a primary or secondary checker.

2. Skyscanner (consistently top-tier, #2 in major tests; hugely popular)
   Outstanding for flexible searches (“Everywhere” or whole month views), budget/low-cost carriers, and international routes. Strong on advance fares, with good date calendars, detailed flight info (amenities, plane type), price trackers, and ratings of booking sites. Slightly weaker on some last-minute deals compared to specialists. A go-to starting point for many travelers and digital nomads.

3. Google Flights (extremely popular for everyday use; often the default recommendation)
   Fastest and most intuitive interface, with excellent price graphs/history, calendar views of cheap dates, Explore map for inspiration (“flights to anywhere”), price tracking/alerts, and context on whether a fare is good. Strong accuracy for major airlines, flexible dates, and APEX (advance) fares. Includes many filters and amenities info. It has improved significantly and often ties or beats others on usability, though it can occasionally miss some budget or niche options that Skyscanner catches. Free, no-frills, and integrates well with Google. Many users start here and cross-check elsewhere.

4. Kayak
   One of the original big names and still widely used. Comprehensive comparisons across airlines and OTAs, strong filters (alliances, aircraft, layovers, etc.), “Hacker Fares” (mix-and-match one-ways), and flexible date tools. Good all-rounder, though some users find the interface busier or results less competitive than Google Flights/Skyscanner/Momondo on pure price. Part of the same family as Momondo.

Strong Specialists and Apps People Also Use

• Skiplagged: Ranks highly for cheap fares (especially last-minute) in tests. Known for “hidden city” ticketing (booking a cheaper flight that stops at your real destination and skipping the last leg—risky, against airline rules, and not recommended for checked bags or round-trips). Use the regular (non-skiplag) results carefully.
• Kiwi.com: Popular for highly flexible or multi-city/complex itineraries and “virtual interlining” (combining separate tickets from different airlines). Good for backpackers or when you don’t care about exact airports/dates. Can involve more self-transfers or risks.
• Hopper (app): Very popular mobile app with strong price prediction (“book now or wait”), color-coded deals, and paid “price freeze” options. Helpful for tracking and short-term decisions; also covers hotels/cars. Over 100 million users.
• Others worth checking: Expedia (and related OTAs like Hotwire) for packages or when it surfaces a winner; Flight Network in some tests; niche tools like ITA Matrix (powerful but technical, underlying Google Flights tech) for power users. Deal alert services (e.g., Going/formerly Scott’s Cheap Flights, The Flight Deal) for error fares and deep discounts.

Practical Tips for Best Results

• Cross-check 2–3 engines: Prices and availability fluctuate; what one misses another finds (e.g., Google Flights for majors/speed + Skyscanner for budgets/flexibility).
• Be flexible: Use “whole month,” “everywhere,” or nearby airports/dates. Midweek flights and shoulder seasons are often cheaper.
• Book direct when possible: After finding a deal, check the airline’s site. This usually offers better support for delays/cancellations.
• Watch extras: Factor baggage, seat selection, and change fees. Set price alerts. Clear cookies or use incognito if prices seem to rise (debated effect).
• OTAs vs. aggregators: Aggregators (the ones above) are generally better for pure searching; OTAs (Expedia, Booking.com, etc.) can work for bundles but watch for fees, bait-and-switch, or service issues.
• Regional notes: Coverage of low-cost carriers (e.g., Southwest in the US, Ryanair/easyJet in Europe) varies—double-check those directly sometimes.
• Apps of the main sites + Hopper are convenient for mobile.

No single “best” exists for every trip—Google Flights and Skyscanner are the ones most people reach for first due to ease and reliability, with Momondo often winning pure price shootouts. Test them on your specific route, as results change. Always read the fine print on fares and consider total trip cost/time.