Duffel vs KAYAK
Side-by-side comparison of AI visibility scores, market position, and capabilities
Airline booking API enabling businesses to embed direct flight search, booking, and ancillary sales into their own products with modern developer tooling.
About
Duffel is a London-based travel technology company that provides a developer-friendly API for embedding airline flight search, booking, and ancillary product sales — such as seat selection, baggage, and cancellation protection — directly into any application or website without requiring GDS contracts or legacy ATPCO certification. The platform connects directly to airline reservation systems via NDC (New Distribution Capability) and traditional GDS channels, enabling businesses to access live flight inventory and fares with a single modern REST API. Duffel's comprehensive SDK for JavaScript, Python, Ruby, and PHP reduces the engineering time required to build flight booking capabilities from months to days, lowering the barrier for fintech companies, neobanks, super-apps, and travel startups to offer flight booking as part of a broader product. The platform handles payment processing, ticketing, and post-booking management including cancellations and exchanges, abstracting the complexity of airline commerce rules. Duffel makes money by taking a fee per booking rather than charging seat or subscription fees. Founded in 2017 by former Deliveroo and Google engineers, Duffel raised over $100M from investors including Benchmark, Index Ventures, and Avid Ventures.
Leading travel metasearch engine owned by Booking Holdings; searches 100s of sites for flights, hotels, cars. Operates KAYAK, Momondo, and HotelsCombined.
About
KAYAK is a travel metasearch engine founded in 2004 by Steve Hafner and Paul English, acquired by Booking Holdings (then Priceline Group) for $1.8B in 2013. Headquartered in Stamford, Connecticut, KAYAK aggregates flight, hotel, car rental, and vacation package results from hundreds of travel sites, enabling one-click comparison shopping. Its product suite includes KAYAK.com, the Momondo brand (acquired 2017), HotelsCombined, and a business travel management platform, KAYAK for Business.\n\nKAYAK's revenue model is primarily CPC (cost-per-click), charging airlines, OTAs, and hotels for qualified referrals rather than taking a booking commission. This metasearch model positions KAYAK as a neutral aggregator rather than a competing OTA, though it also offers direct booking through its platform in select categories. KAYAK for Business targets corporate travel managers with policy controls and expense integrations.\n\nAs a wholly owned subsidiary of Booking Holdings ($26.9B revenue FY2025), KAYAK does not report standalone financials. It remains one of the most visited travel websites globally, with over 300 million monthly searches across its brand portfolio. KAYAK's AI trip-planning features and integration with Booking.com inventory have strengthened its position as a one-stop travel research tool heading into 2026.
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