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    Top 100 Busiest Routes of United Airlines in 2025

    Aero WorldBy Aero WorldMay 23, 2025Updated:May 24, 20254 Mins Read
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    United Airlines Boeing 767
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    United Airlines is one of the largest full-service carrier with a vast network of domestic and international routes operating out of its major hubs at Chicago-O’Hare (ORD), Newark (EWR), Denver (DEN), Houston-Intercontinental (IAH), and Washington-Dulles (IAD) among others. United’s network has been designed to serve high-frequency business segments and long-haul international routes, aided by a base of robust domestic connections.

    In 2025, United’s busiest routes are still driven by strong demand along the East and West Coasts and the central United States, particularly on high-density business routes and trunk routes between major cities. This article covers the Top 100 busiest United Airlines routes by average monthly flights, published seats, and available seat miles (ASMs).

    United Airlines Boeing 777

    Leading United’s Domestic Operations

    Topping United’s busiest routes is the intra-regional shuttle between New York-LaGuardia (LGA) and Chicago-O’Hare (ORD), with 844 average monthly flights and over 140,000 seats a month. Following close behind are other dominant business corridors including Washington-National (DCA) to ORD and EWR to ORD, both of which are the key routes of United’s East Coast-to-Midwest network.

    Notably, the transcontinental San Francisco (SFO) to Newark (EWR) route is the fourth busiest in frequency but the largest in terms of ASMs at over 402 million available seat miles per month. This reflects the initial deployment of premium widebody aircraft such as the Boeing 777 and 787 to operate a split of high-yield business and long-haul leisure traffic.

    For easier readability, the complete dataset is split into two tables, and each contains 50 routes.

    Top 100 Busiest United Airlines Routes

    RankRouteFlightsSeatsASMs
    1New York-La Guardia (LGA) - Chicago-O'Hare (ORD)844140104102696232
    2Washington-National (DCA) - Chicago-O'Hare (ORD)6789594858720176
    3New York (EWR) - Chicago-O'Hare (ORD)65211590083332100
    4New York (EWR) - San Francisco (SFO)649156962402607530
    5Denver (DEN) - Houston-Intercontinental (IAH)641131152112921872
    6Houston-Intercontinental (IAH) - Chicago-O'Hare (ORD)637123700114422500
    7Chicago-O'Hare (ORD) - San Francisco (SFO)637152901282255246
    8Denver (DEN) - Chicago-O'Hare (ORD)621137578122169264
    9Los Angeles (LAX) - Chicago-O'Hare (ORD)615125136218362320
    10Houston-Intercontinental (IAH) - San Francisco (SFO)606120034196255590
    11Denver (DEN) - San Francisco (SFO)596127995123771165
    12Los Angeles (LAX) - San Francisco (SFO)5929857533219775
    13New York (EWR) - Los Angeles (LAX)585137575337609050
    14New York (EWR) - Orlando (MCO)57010009393887234
    15Denver (DEN) - Los Angeles (LAX)55110371289399744
    16Houston-Intercontinental (IAH) - Los Angeles (LAX)548101779140353241
    17Houston-Intercontinental (IAH) - New Orleans (MSY)4907221822026490
    18Denver (DEN) - New York (EWR)47083570134129850
    19New York (EWR) - Houston-Intercontinental (IAH)46982869116016600
    20Boston (BOS) - Chicago-O'Hare (ORD)4688138070556460
    21Houston-Intercontinental (IAH) - Las Vegas (LAS)4598038198225582
    22Houston-Intercontinental (IAH) - New York-La Guardia (LGA)45674720105803520
    23Denver (DEN) - Washington-Dulles (IAD)454101993148093836
    24Las Vegas (LAS) - San Francisco (SFO)4517763532140890
    25Austin (AUS) - Houston-Intercontinental (IAH)449645919042740
    26San Diego (SAN) - San Francisco (SFO)4467615534041285
    27Washington-Dulles (IAD) - Los Angeles (LAX)44589159203995792
    28Denver (DEN) - Las Vegas (LAS)4377792249012938
    29Washington-Dulles (IAD) - San Francisco (SFO)43493031225041989
    30New York (EWR) - London-Heathrow (LHR)43472478251208748
    31Houston-Intercontinental (IAH) - Orlando (MCO)4237681865525754
    32Minneapolis/Saint Paul (MSP) - Chicago-O'Hare (ORD)4186473821622492
    33Washington-National (DCA) - Houston-Intercontinental (IAH)4115717869071024
    34New York (EWR) - West Palm Beach (PBI)3956896070615040
    35Houston-Intercontinental (IAH) - San Antonio (SAT)3835884111238631
    36Las Vegas (LAS) - Chicago-O'Hare (ORD)38371348108092220
    37Dallas/Fort Worth (DFW) - Houston-Intercontinental (IAH)3815126611483584
    38New York (EWR) - Las Vegas (LAS)37866205147438535
    39Denver (DEN) - Phoenix (PHX)3766650440035408
    40Chicago-O'Hare (ORD) - Phoenix (PHX)3766911899529920
    41Washington-Dulles (IAD) - Houston-Intercontinental (IAH)3726221274032280
    42Washington-Dulles (IAD) - Chicago-O'Hare (ORD)3726487138209019
    43Washington-Dulles (IAD) - Orlando (MCO)3716814751655426
    44Orlando (MCO) - Chicago-O'Hare (ORD)3677346173828305
    45Cleveland (CLE) - Chicago-O'Hare (ORD)3635554717552852
    46Denver (DEN) - San Diego (SAN)3606404454629532
    47Boston (BOS) - Denver (DEN)35866139116007806
    48Dallas/Fort Worth (DFW) - Chicago-O'Hare (ORD)3565159741380794
    49New York (EWR) - Fort Lauderdale (FLL)3556273966817035
    50Austin (AUS) - Denver (DEN)3545317341209075
    Largest Airlines
    United Airlines Boeing 787

    The Other Half: United Airlines Busiest Routes

    RankRouteFlightsSeatsASMs
    1New York-La Guardia (LGA) - Chicago-O'Hare (ORD)844140104102696232
    2Washington-National (DCA) - Chicago-O'Hare (ORD)6789594858720176
    3New York (EWR) - Chicago-O'Hare (ORD)65211590083332100
    4New York (EWR) - San Francisco (SFO)649156962402607530
    5Denver (DEN) - Houston-Intercontinental (IAH)641131152112921872
    6Houston-Intercontinental (IAH) - Chicago-O'Hare (ORD)637123700114422500
    7Chicago-O'Hare (ORD) - San Francisco (SFO)637152901282255246
    8Denver (DEN) - Chicago-O'Hare (ORD)621137578122169264
    9Los Angeles (LAX) - Chicago-O'Hare (ORD)615125136218362320
    10Houston-Intercontinental (IAH) - San Francisco (SFO)606120034196255590
    11Denver (DEN) - San Francisco (SFO)596127995123771165
    12Los Angeles (LAX) - San Francisco (SFO)5929857533219775
    13New York (EWR) - Los Angeles (LAX)585137575337609050
    14New York (EWR) - Orlando (MCO)57010009393887234
    15Denver (DEN) - Los Angeles (LAX)55110371289399744
    16Houston-Intercontinental (IAH) - Los Angeles (LAX)548101779140353241
    17Houston-Intercontinental (IAH) - New Orleans (MSY)4907221822026490
    18Denver (DEN) - New York (EWR)47083570134129850
    19New York (EWR) - Houston-Intercontinental (IAH)46982869116016600
    20Boston (BOS) - Chicago-O'Hare (ORD)4688138070556460
    21Houston-Intercontinental (IAH) - Las Vegas (LAS)4598038198225582
    22Houston-Intercontinental (IAH) - New York-La Guardia (LGA)45674720105803520
    23Denver (DEN) - Washington-Dulles (IAD)454101993148093836
    24Las Vegas (LAS) - San Francisco (SFO)4517763532140890
    25Austin (AUS) - Houston-Intercontinental (IAH)449645919042740
    26San Diego (SAN) - San Francisco (SFO)4467615534041285
    27Washington-Dulles (IAD) - Los Angeles (LAX)44589159203995792
    28Denver (DEN) - Las Vegas (LAS)4377792249012938
    29Washington-Dulles (IAD) - San Francisco (SFO)43493031225041989
    30New York (EWR) - London-Heathrow (LHR)43472478251208748
    31Houston-Intercontinental (IAH) - Orlando (MCO)4237681865525754
    32Minneapolis/Saint Paul (MSP) - Chicago-O'Hare (ORD)4186473821622492
    33Washington-National (DCA) - Houston-Intercontinental (IAH)4115717869071024
    34New York (EWR) - West Palm Beach (PBI)3956896070615040
    35Houston-Intercontinental (IAH) - San Antonio (SAT)3835884111238631
    36Las Vegas (LAS) - Chicago-O'Hare (ORD)38371348108092220
    37Dallas/Fort Worth (DFW) - Houston-Intercontinental (IAH)3815126611483584
    38New York (EWR) - Las Vegas (LAS)37866205147438535
    39Denver (DEN) - Phoenix (PHX)3766650440035408
    40Chicago-O'Hare (ORD) - Phoenix (PHX)3766911899529920
    41Washington-Dulles (IAD) - Houston-Intercontinental (IAH)3726221274032280
    42Washington-Dulles (IAD) - Chicago-O'Hare (ORD)3726487138209019
    43Washington-Dulles (IAD) - Orlando (MCO)3716814751655426
    44Orlando (MCO) - Chicago-O'Hare (ORD)3677346173828305
    45Cleveland (CLE) - Chicago-O'Hare (ORD)3635554717552852
    46Denver (DEN) - San Diego (SAN)3606404454629532
    47Boston (BOS) - Denver (DEN)35866139116007806
    48Dallas/Fort Worth (DFW) - Chicago-O'Hare (ORD)3565159741380794
    49New York (EWR) - Fort Lauderdale (FLL)3556273966817035
    50Austin (AUS) - Denver (DEN)3545317341209075

    United’s Network Strength in 2025

    The busiest routes highlights United’s reliance on its central hubs for network reach and scheduling flexibility. Chicago-O’Hare (ORD) remains the pillar of United operations, a hub for connections to the East Coast, West Coast, and overseas destinations. Routes such as ORD–San Francisco, ORD–Denver, and ORD–Los Angeles are consistently among the ones offering the most seats.

    Denver (DEN) and Houston-Intercontinental (IAH) are equally vital to connecting United’s mountain and southern operations. The Denver–Houston and Denver–Chicago routes offer more than 120,000 monthly seats each, in line with strong cross-country demand. Furthermore, IAH as a southern gateway is especially illustrated through its connections to San Francisco, Los Angeles, and numerous Florida cities.

    Coastal transcontinental operations such as EWR–LAX and EWR–SFO also stand out for their high ASMs, both in excess of 330 million a month, based on the use of widebodies with premium cabin arrangements and lie-flat seating. They are United’s corporate and premium anchor against Delta and American, particularly in New York and California markets.

    United Airlines Boeing 777

    Route Strategy and Hub Dynamics

    United’s domestic route network in 2025 remains targeted on high-density business travel corridors and strong hub-to-hub operations. Intra-hub routes such as IAH–ORD, DEN–ORD, and DEN–IAH see some of the highest traffic, allowing good connectivity within the network. Trunk routes are timed multiple times a day on narrowbody mainline jets, allowing flexibility in connecting onward schedules.

    On the East Coast, the carrier has a robust presence in Newark (EWR), with high-demand routes such as Orlando, Fort Lauderdale, and West Palm Beach — routes that combine VFR traffic with year-round vacation loads. These vacation markets typically have high load factors and seasonal frequency enhancements.

    In the western United States, United Airlines maintains its San Francisco (SFO) and Los Angeles (LAX) hubs to anchor Pacific connectivity and cross-country capacity. SFO–LAX, despite a 90-minute flight, is one of the busiest short-haul routes in the United network, with nearly 600 flights per month. It also feeds the airline’s transpacific traffic by shoving passengers into western gateway cities.

    Largest Airlines
    United Airlines Boeing 737 MAX

    Long-Haul and International Standouts

    Of the top 100 routes, London Heathrow (LHR)–EWR is the busiest international route by ASMs, with 251 million available seat miles per month. Also noteworthy is United’s intra-North America network, featuring high-frequency routes to Mexico City (MEX), Cancun (CUN), and Vancouver (YVR) as the hub for cross-border traffic from Houston, San Francisco, and Denver. United’s Houston–Cancun alone carries an average of nearly 63,000 seats monthly.

    As a whole, the Top 100 busiest United routes of 2025 indicate a highly concentrated network, high-yielding, and optimized for frequent hub-to-hub connections and premium cross-continent flights. While United has expanded heavily outside of the U.S., its biggest strength is still its U.S. domestic base — connecting big cities with high frequency and flexibility.

    In an age of competitive equilibrium increasingly characterized by dynamic schedules and fluid passenger demand, United’s network has the size and scope to compete in every corner of the market — from regional routes to ultra-premium corridors.

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    United Airlines Pilot Salary in 2025

    Sources: Cirium Diio

    Busiest Routes Featured routes United Airlines United Airlines Busiest Routes United Airlines Routes
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