KAYAK review

KAYAK earns third place for pairing wide fare comparison with the most trip management tools on this list. Its US App Store listing says it searches hundreds of travel sites at once and lets you narrow flights with filters, while KAYAK Explore shows where you can fly within a budget you set. Price Alerts cover flights, hotels and cars, and the Ask AI feature takes trip requests in plain language. After booking, the Trips tool collects confirmations from your inbox, sends flight and gate change alerts and keeps boarding passes available offline, and the app can measure a carry-on bag with the camera to avoid a size fee. The trade-offs are that the flight tracker and bag tool are app-only, and momondo runs on the same KAYAK engine, so using both adds little coverage. We compared documented features and published information; we did not book test trips.

Who it is for

travelers who want fare search plus trip tracking tools

Price

Free website and app; you pay only the fare and any extras.

KAYAK: Flights, Hotels & Cars Plan vacations & book trips Free
Quoted from the vendor pricing page on November 12, 2026.

Key features

• Searches hundreds of flight sites at once with filters
• KAYAK Explore shows flight options within a set budget
• Price Alerts on flights, hotels and cars
• Ask AI for trip planning in plain language
• App-only flight tracker and camera tool that checks carry-on bag size

Strengths and weaknesses

• Strength: Budget-first Explore search for travelers with a fixed spend
• Strength: Trips tool keeps confirmations and boarding passes available offline
• Strength: 4.8 rating from 500K ratings on the US App Store
• Weakness: Flight tracker and bag measuring are only in the app
• Weakness: Mobile-only hotel rates require the app
• Weakness: Shares its search engine and feature set with momondo, which KAYAK also develops

Key facts

• Sites searched: Hundreds
• Budget search: KAYAK Explore
• Price alerts: Yes
• App Store rating: 4.8 from 500K ratings
• Cost: Free

Where it ranks

KAYAK is No. 3 in our Best Flight Search Sites verdict.