Cheap Flights to Chicago O'Hare International Airport
Planning a trip through the Midwest?
Discover cheap flights to Chicago O’Hare International Airport (ORD), one of the busiest airports in the world and a major hub for both United and American Airlines.
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or request an offerAbout Chicago O'Hare International Airport (ORD)
Chicago O’Hare International Airport is a major aviation hub in the Midwest, with 857,392 takeoffs and landings in 2025, making it the busiest airport in the United States by aircraft movements. The airport serves as United Airlines’s main hub and American Airlines’s third-largest hub, with over 30 carriers offering non-stop flights to more than 250 destinations worldwide.
Airport code
ORD (ICAO: KORD)
Location
Chicago, Illinois, United States
Airlines serving
United Airlines (hub), American Airlines (hub), Air Canada, Lufthansa, British Airways, Delta
Popular Routes to and from Chicago
United and American’s extensive domestic networks anchor O’Hare’s routes, alongside a wide range of international connections.
Route Type
Popular Connections
Domestic
New York, Los Angeles, Denver, Atlanta, San Francisco
International
London, Frankfurt, Tokyo, Toronto, Mexico City
Best Time to Book Cheap Flights
Booking 4 to 8 weeks ahead generally works well for domestic routes into O’Hare, with earlier booking recommended for international travel and Chicago’s peak summer season, when the city’s lakefront and outdoor attractions are busiest.
What to See Near Chicago
Chicago is known for its iconic skyline, dominated by landmarks like the Willis Tower, along with its famous deep-dish pizza and vibrant lakefront along Lake Michigan. The city’s world-class museums, architecture tours, and cultural institutions make it a premier destination for both business and leisure travelers.
Things to Know When Flying Into O'Hare
O’Hare has four terminals, numbered 1, 2, 3, and 5, with no Terminal 4; Terminals 1, 2, and 3 connect via airside walkways, while Terminal 5 requires the free Airport Transit System train.
United Airlines operates from Terminal 1, home to the airport’s iconic neon-lit underground tunnel between Concourses B and C.
American Airlines operates from Terminal 3, the airport’s largest terminal, spanning Concourses G, H, K, and L.
The $8.5 billion “O’Hare 21” expansion plan is underway, including a new Global Terminal replacing Terminal 2 and additional Terminal 5 gates.
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FAQs — Flights to International Airport
O'Hare is United Airlines's main hub and American Airlines's third-largest hub, with over 30 carriers in total, including Air Canada, Lufthansa, British Airways, and Delta, serving over 250 destinations.
O'Hare has four passenger terminals, numbered 1, 2, 3, and 5 (there is no Terminal 4). Terminals 1, 2, and 3 are connected by airside walkways, while Terminal 5 is reached via the free Airport Transit System train.
United Airlines operates from Terminal 1, its main domestic and international hub, featuring the airport's iconic neon-lit underground tunnel connecting Concourses B and C.
American Airlines operates from Terminal 3, the largest terminal at O'Hare, spanning Concourses G, H, K, and L with 80 gates.
Booking 4 to 8 weeks ahead generally works well for domestic routes, with earlier booking recommended for international travel and peak summer season.
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