I used Google Flights for years. Like, religiously. Every single trip started there. Type in the dates, check the calendar view, compare a few prices, book. Done. I never questioned it because honestly it worked fine. Or at least I thought it did.
Then something happened that changed my whole approach.
Last February I was planning a trip to Madrid. Google Flights showed me $487 round trip from Philadelphia. Decent, not amazing. I almost booked it. But a friend of mine who travels constantly told me to check Skiplagged before I paid anything. I had heard of it but never actually used it. So I pulled it up, typed in the same dates, same airports.
$291.
I sat there staring at my screen for a good thirty seconds. Same airline. Same dates. Nearly two hundred dollars less. I felt like an idiot for not checking sooner.
That sent me down a rabbit hole. I started testing a bunch of different flight search tools side by side. Google Flights against Skiplagged, Momondo, Kiwi, Secret Flying, all of them. And what I found honestly surprised me.
Google Flights is good at showing you the basics. It is clean, fast, and easy to use. No argument there. But it misses stuff. It does not always show hidden city ticketing options. It skips some budget carriers entirely. And the price alerts are okay but not great compared to what else is out there.
Skiplagged is fantastic for finding hidden city fares that Google will never show you. Momondo consistently pulled up options that were ten to fifteen percent cheaper on international routes. And Secret Flying is a whole different animal. It is basically a deal feed run by people who manually spot error fares and flash sales. I snagged a round trip to Seoul for $318 through a deal I found there last April.
Kiwi is also worth mentioning because it lets you build these wild multi carrier itineraries that no other platform touches. The downside is customer support can be rough if things go wrong. So keep that in mind.
My system now is pretty simple. I start with Momondo for a baseline price. Then I check Skiplagged for hidden options. Then I scan Secret Flying for any active deals on my route.
Google Flights is still fine. But fine is not the same as best. And when saving two hundred bucks takes five extra minutes of searching, why would you not do it?
Try it on your next trip. Seriously. You will probably be annoyed you waited this long.