Design
Flight Reservation System
Design a flight reservation system like MakeMyTrip — users search flights, book seats, and manage itineraries.
This is a Low-Level Design (LLD) problem. New to LLD vs HLD? Start here.
01 - Why interviewers ask this
Multi-leg trips and fare classes make this meaningfully harder than a single hotel/room booking — interviewers use it to see if your seat/inventory model scales to connecting flights.
02 - Where this system exists in the real world
You interact with this design every day.
Airline booking systems (fare classes, multi-leg trips)
Travel aggregator platforms (Expedia, Skyscanner)
Corporate travel management tools
03 - What you'll master
Solve this once. Know it forever.
Model multi-leg itineraries and connections
Handle fare classes and dynamic pricing
Manage seat inventory across a flight network
04 - What you'll design
7 functional · 3 non-functional requirements.
Search flights by origin, destination, date, and passenger count
6 more requirements inside
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05 - Companies that ask this
You may face this exact question in your next interview.
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