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All there's to know about United Airlines

United Airlines is the largest airline in the United States by daily departures. It operates around 4,500 flights per day and has a fleet of more than 1,075 aircraft, making it the biggest airline globally by fleet size. The airline serves 350+ destinations in over 60 countries and operates major hubs at Chicago O’Hare (ORD), Houston Intercontinental (IAH), Denver (DEN), Los Angeles (LAX), Newark (EWR), San Francisco (SFO), Washington Dulles (IAD), and Guam (GUM). Founded in 1926, United grew through mergers, including the 2010 acquisition of Continental Airlines, and is a founding member of the Star Alliance.

Passengers flying with United Airlines can choose from Basic Economy, Economy, Economy Plus, Premium Economy, Business Class (Polaris), and First Class. Services include online check-in, mobile app check-in, airport kiosks, frequent-flyer rewards through MileagePlus, in-flight Wi-Fi, and entertainment options. Boarding passes are issued after completing the check-in process.

United Airlines has global codeshare connectivity, operating both domestic and international flights with extensive coverage across North America, Europe, Latin America, Asia, and Africa.

The airline has more than 20 codeshare partners that include:

• Air Canada
• Lufthansa
• Swiss International Air Lines
• Austrian Airlines
• Brussels Airlines
• Scandinavian Airlines (SAS)
• TAP Air Portugal
• Turkish Airlines

United Airlines Check-In and Boarding Process

With United Airlines, passengers receive their boarding pass only after completing check-in.

Ways To Check-In

• Online check-in via mobile or desktop (available 24 hours before departure).
• Mobile app check-in with digital boarding pass.
• Airport kiosks for self-service check-in and bag tags.
• Counter check-in with staff assistance.
• Curbside check-in at select airports.

Passengers can check in online starting 24 hours up to 45 minutes before domestic flights and up to 90 minutes before international flights. For airport check-in, passengers should arrive at least 2–3 hours before departure. Boarding begins 30–40 minutes before departure and closes 15 minutes prior.

Boarding Pass Options

• Mobile boarding pass – convenient and easy to access on your smartphone.
• Printed boarding pass – reliable for long journeys or connecting flights when phone battery may run low.

Premium Check-In For United Polaris® and United First

• Dedicated check-in counters are available at major airports for premium cabin travelers.
• Personalized service from United agents for baggage and travel needs.
• Direct access to priority security lanes reduces wait times.
• Priority baggage tagging ensures faster delivery at baggage claim.

Curbside Check-In

• Counters are located outside the terminal, near the departure curb.
• Passengers can check bags (with tags applied), print boarding passes, and receive seat assignments (if available).
• Staffed by airport agents to assist with luggage and check-in.
• Most domestic flights allow curbside check-in, but international flights require check-in at the inside counter.
• No extra fee for curbside check-in itself; standard baggage fees still apply.

What To Do If a Boarding Pass Is Lost?

A boarding pass is essential for travel with United Airlines, as it contains your flight number, departure gate, boarding time, and destination details. If you misplace or lose your boarding pass, don’t panic — United Airlines provides several ways to reissue or reprint it quickly.

Steps To Recover a Lost Boarding Pass

• Report immediately to the United Airlines check-in counter and request a new boarding pass.
• Provide valid government ID and flight details to verify your booking.
• Use a self-service kiosk at the airport to reprint your boarding pass in minutes.
• If you have a mobile boarding pass, simply show it at security or reprint it if needed.
• If you are already inside the airport, approach the gate agent for assistance and boarding pass re-printing.

United Airlines Boarding Zones

• Pre-boarding: Offered to travelers who require special assistance, including passengers with disabilities and families traveling with young children.
• Group 1: Includes United Polaris® Business Class, United First®, and MileagePlus Premier 1K® members.
• Group 2: Reserved for MileagePlus Premier Platinum® members, Star Alliance Gold travelers, and select premium cabin passengers.
• Group 3: Covers MileagePlus Premier Gold® members and Economy Plus® passengers with extra legroom seating.
• Group 4: For MileagePlus Premier Silver® members and eligible United Airlines credit card holders.
• Groups 5–9: General boarding for Economy passengers, organized by seat location and fare type, with Basic Economy boarding last.

United Airlines Baggage Policy

United Airlines allows passengers to carry baggage while maintaining safety and comfort for all travelers. The allowance depends on the route, cabin class, and MileagePlus frequent flyer membership level. The baggage policy is divided into three main categories: personal baggage, carry-on baggage, and checked baggage.

Personal Baggage

• All passengers are allowed one personal item free of charge.
• This may include a handbag, laptop bag, small backpack, or similar item.
• The item must fit under the seat in front of you.
• Recommended dimensions: up to 17 × 13 × 8 inches (43 × 33 × 20 cm).

Carry-On Baggage

• One carry-on bag is generally allowed along with a personal item, depending on fare rules.
• The bag must fit in the overhead bin.
• Maximum dimensions: 22 × 14 × 9 inches (56 × 36 × 23 cm) including handles and wheels.
• Basic Economy passengers may only bring one personal item unless they are Premier members or eligible credit card holders.

Checked Baggage

• Economy passengers: 1 bag on many international routes, weighing up to 50 lbs (23 kg).
• Premium Economy passengers: 2 bags, each weighing up to 50 lbs (23 kg).
• Business Class passengers: 2 bags, each weighing up to 70 lbs (32 kg).
• United First® and Polaris® passengers: Up to 2–3 bags, each weighing up to 70 lbs (32 kg), depending on route.

Additional Policies

• Extra baggage can be purchased online, via the app, or at the airport.
• Overweight and oversized bags incur additional charges.
• Bags exceeding standard limits may not be accepted.
• All items must be packed securely inside proper luggage.

Pet Carriers

• Pet carriers are considered a personal item and must fit under the seat in front of you.
• Soft-sided carriers are recommended to meet space requirements.
• A pet fee is paid at the airport during check-in.
• The carrier must allow the pet to stand and turn around comfortably.

United Airlines Hubs and Top Routes

Chicago O’Hare International Airport (ORD)

Chicago O’Hare is United Airlines’ primary hub. Operating from Terminals 1, 2, and 5, United manages thousands of flights monthly. ORD offers extensive facilities including multiple United Clubs and the Polaris Lounge for premium international travelers.

• Top Route: Chicago (ORD) to London Heathrow (LHR)

Newark Liberty International Airport (EWR)

Newark serves as United’s main East Coast hub. United operates a large share of flights from Terminal C, providing extensive transatlantic connectivity and easy access to New York City.

• Top Route: Newark (EWR) to Tel Aviv (TLV)

San Francisco International Airport (SFO)

San Francisco is United’s premier hub for transpacific flights. Operating from Terminal 3 and the International Terminal, SFO connects the U.S. to major destinations in Asia and Oceania.

• Top Route: San Francisco (SFO) to Tokyo Narita (NRT)

Houston George Bush Intercontinental Airport (IAH)

Houston is United’s largest hub in the southern U.S. Operating primarily from Terminals C and E, IAH serves as the major gateway for flights to Mexico, Central America, and South America.

• Top Route: Houston (IAH) to Mexico City (MEX)

Denver International Airport (DEN)

Denver is United’s central hub, ideal for connecting flights across the U.S. United operates from Concourse B, linking the Midwest and Mountain West to destinations nationwide.

• Top Route: Denver (DEN) to Los Angeles (LAX)

Los Angeles International Airport (LAX)

Los Angeles is a major hub for West Coast operations. Operating mainly from Terminals 7 and 8, LAX is a critical hub for flights to Asia, Australia, and Europe.

• Top Route: Los Angeles (LAX) to Sydney (SYD)

Washington Dulles International Airport (IAD)

Washington Dulles is United’s hub for transatlantic and Middle East flights. Strategically located near Washington, D.C., it is a key hub for government and diplomatic travel.

• Top Route: Washington Dulles (IAD) to Frankfurt (FRA)

Guam Antonio B. Won Pat International Airport (GUM)

Guam serves as United’s Pacific hub, connecting Micronesia and Asia. This hub is essential for linking smaller Pacific islands to major international cities.

• Top Route: Guam (GUM) to Tokyo Narita (NRT)

Frequently Asked Questions

What Is the Fleet Size and Aircraft Operated by United Airlines?

United operates more than 1,075 aircraft, including the Airbus A320 family and Boeing 737, 757, 767, 777, and 787 Dreamliner series, used for both domestic and international routes.

What Is the On-Time Performance Record of United Airlines?

United maintains a moderate on-time performance, averaging around 70–75% on-time arrivals, depending on seasonal and weather conditions.

How Safe Is United Airlines?

United Airlines has a strong safety record and is consistently ranked among the safest airlines worldwide in industry evaluations.

How Many Passengers Does United Airlines Carry Annually?

United Airlines carried approximately 173.6 million passengers in 2024, making it one of the largest airlines globally by passenger volume.

Does United Airlines Allow Pets on Flights?

Yes, pets are allowed in the cabin if they are at least 8 weeks old. Carriers must not exceed 19 × 13 × 9 inches, and combined weight must be 20 pounds or less.

Does United Airlines Provide Wheelchair Assistance?

Yes, United Airlines provides wheelchair assistance. Requests can be made online during booking, through the app, or at the airport.

Does United Airlines Offer Discounts for Military, Students, or Seniors?

Active-duty military receive waived baggage fees and priority boarding. Student and senior discounts are more limited and subject to specific promotions.

What Is United Airlines’ Policy for Pregnant Passengers?

Pregnant women can generally fly on domestic routes until 36 weeks without restrictions. International travel may require a medical certificate after 28–32 weeks.