Free tools that find cheaper flights than Google Flights

Google Flights is the best single search tool for most travelers. It is also not enough. There is a small, stable set of free supplementary tools that consistently surface prices, fares, and routings that Google Flights either misses entirely or buries — and the flight-deal communities have converged on roughly the same combination for years. The combined approach takes about ten minutes per trip and produces real, documented savings.

How we evaluated

This piece pulls from three public sources. Going's (formerly Scott's Cheap Flights) free-tier deal history, which is publicly visible and documents the kinds of mistake fares and sale fares the service surfaces. Published accuracy and methodology data from Hopper and observable price comparisons against Skiplagged. And r/travel, r/solotravel, and r/awardtravel community consensus, where the same multi-tool combination surfaces year after year. No insider tools, no paid tiers required for the recommendation — every tool listed is usable for free.

The verdict

The combination approach earns a Worth-It Score of 9.2. No single tool wins. Google Flights is the best baseline, Going beats it on event-driven deals, Hopper beats it on directional buy-now-or-wait calls, Skiplagged beats it on routings airlines won't show you, and Kiwi.com beats it on cross-airline open-jaw itineraries. Using all of them takes about ten minutes per trip and consistently produces savings on roughly one trip in three or four — savings that materially exceed the time cost.

The evidence

Google Flights as the baseline

Community consensus across r/travel and r/awardtravel is essentially unanimous: start every flight search on Google Flights. The reasons are practical. The calendar view shows price-by-date for an entire month at once. The price-tracking alerts are reliable. The interlining and connection logic is honest. And the "explore" map view is the best tool for "where can I go cheaply" questions. Independent analysis from r/travel threads consistently shows Google Flights returning the same or lower price than Expedia, Kayak, and Priceline on the majority of standard direct searches. It is the floor of any sensible search workflow, not the ceiling.

Going (formerly Scott's Cheap Flights) — the deal layer

Going's free tier sends email alerts when the service detects mistake fares (published prices that are clearly errors) and major sale fares on routes a subscriber has marked. r/travel threads repeatedly credit the service with $300-500 savings on specific trips — for example, a $400 round-trip Europe deal that would normally have cost $900 — surfaced through a Going alert that Google Flights did not flag because Going's value is detection, not search. The free tier is sufficient for occasional travelers; the paid tier surfaces more deals faster. Community consensus is that the free tier alone produces enough value to justify signing up.

Hopper — price prediction

Hopper's contribution is directional. The app's Price Forecast feature publishes a directional accuracy rate of roughly 68% on its buy-now-vs-wait recommendations on routes where it offers a call. That number is well short of certainty but better than coin flip, and it is enough to be useful as a tiebreaker when you have a specific date set and are deciding whether to commit now or wait two weeks. Hopper does not consistently beat Google Flights on raw price; it complements Google Flights by answering a different question.

Skiplagged — hidden-city ticketing

Skiplagged surfaces hidden-city ticketing options — itineraries where the cheapest flight to your destination is actually a connecting itinerary that uses your destination as a layover. You book the longer ticket, exit at the layover, and skip the final leg. Independent analysis comparing Skiplagged routings to standard search on specific origin-destination pairs shows real, sometimes substantial savings on major hub-to-hub routes. The tradeoffs are real and well-documented in r/travel threads: airlines do not like the practice, you cannot check bags, you cannot use the trip on a round-trip return, and frequent abuse can risk your frequent-flyer account. The legality for leisure travelers is settled — it is legal — but the contractual relationship with the airline is contested. Most community advice frames it as a useful occasional tool, not a default strategy.

Kiwi.com — cross-airline itineraries

Kiwi.com builds itineraries that combine airlines that do not have interline agreements with each other. For open-jaw routes (fly into Lisbon, out of Athens) and complex multi-city itineraries, Kiwi.com surfaces combinations Google Flights will not show because Google Flights generally only displays interlined routings. r/solotravel threads consistently recommend Kiwi.com for backpacker-style itineraries and around-the-world planning. The trade-off: when you book separately combined airlines, you lose the protections of an interlined ticket — a delay on the first flight that causes you to miss the second is your problem, not the airlines'. Kiwi.com offers its own protection product to address this; community consensus is mixed on whether it is worth the cost.

What the combination workflow looks like

The r/travel consensus workflow that surfaces in nearly every "how do I find a cheap flight" thread looks roughly like this. Start on Google Flights to set a baseline price and a calendar-view sense of the cheap days for the route. Sign up for Going on the routes that matter to you and let the alerts arrive passively over weeks. When you have specific dates, run Hopper for a directional buy-now-or-wait call. If the trip allows positioning or an open jaw, check Kiwi.com. If the trip is a one-way to a major hub, check Skiplagged with the trade-offs in mind. The combined search rarely takes more than ten minutes for a trip you've already partly planned.

Who it's best for

What it doesn't beat

The combination approach does not beat dedicated points-and-miles strategy for travelers who are already deep into that ecosystem — a well-timed transferable-points redemption can deliver savings that no cash-fare tool can match. It also does not beat genuine date and destination flexibility. The traveler who can fly Tuesday-to-Tuesday to "anywhere in Europe" will find better deals through Google Flights' "explore" view than the traveler with locked dates and a single destination will find through any of these tools combined. The strategy is "best free-tool stack for cash-paying travelers with at-least-some flexibility" — not "best deal possible at any cost."

Verdict

Sources

• Going (formerly Scott's Cheap Flights) free-tier deal alerts and history (pricing-data)
• Hopper Price Forecast methodology and Skiplagged routing comparisons (independent-test)
• r/travel, r/solotravel, and r/awardtravel community threads (community-consensus)