Games like SimAirport
Games like SimAirport include Cities: Skylines, Cities: Skylines II, Prison Architect, Manor Lords, and Transport Fever 2. We matched them by the tags players give SimAirport on Steam (Flight, City Builder, Management, Casual, and Economy): closest matches first, and among equally close ones the better-known games.

Cities: Skylines
Shared: City Builder · Management · Building

Cities: Skylines II
Shared: City Builder · Management · Building

Prison Architect
Shared: Building · Base Building · Management

Manor Lords
Shared: City Builder · Base Building · Management

Transport Fever 2
Shared: Management · City Builder · Strategy

Kingdoms and Castles
Shared: City Builder · Management · Building

Jurassic World Evolution
Shared: Management · Building · City Builder

Foundation
Shared: City Builder · Management · Simulation

Jurassic World Evolution 2
Shared: Management · Building · City Builder

Against the Storm
Shared: City Builder · Base Building · Management

Workers & Resources: Soviet Republic
Shared: City Builder · Base Building · Strategy

Project Highrise
Shared: Management · Building · Simulation

Planet Zoo
Shared: Management · City Builder · Building

Factorio
Shared: Base Building · Sandbox · Management

Game Dev Tycoon
Shared: Management · Casual · Economy

Oxygen Not Included
Shared: Base Building · Management · Building

Planet Coaster
Shared: Management · Building · Sandbox

Empires of the Undergrowth
Shared: City Builder · Base Building · Strategy

SimCity™ 4 Deluxe Edition
Shared: City Builder · Management · Base Building

Two Point Museum
Shared: Casual · City Builder · Building

Transport Fever
Shared: Flight · City Builder · Management

Tropico 6
Shared: City Builder · Management · Economy

Frostpunk
Shared: City Builder · Strategy · Building

Anno 1800
Shared: City Builder · Economy · Strategy