United Airlines and Air Canada are both full-service Star Alliance members, based in Chicago and Montreal respectively. Travellers compare them mainly on US–Canada routes, where the two compete directly and also share connections through the alliance.
Quick verdict
United is the better fit if you start or end in the US, want the widest US domestic and global network, or are building MileagePlus status. Air Canada suits travellers starting in Canada, wanting Canadian hubs and Aeroplan, and those who value its recent punctuality gains. Both are full-service, so compare the exact fare: Air Canada's Economy Basic on North American routes excludes a carry-on.
Choose United Airlines if…
- You are flying from or within the US and want the biggest choice of hubs, including Newark, Chicago, Denver, Houston and San Francisco.
- You collect MileagePlus miles and Star Alliance status with a US-based carrier.
- You want a large all-Boeing wide-body fleet, with 787s on order.
Choose Air Canada if…
- You are starting in Canada and want a Canadian flag carrier with domestic and transborder links.
- You earn or spend Aeroplan points, or want Star Alliance benefits through a Canadian programme.
- Punctuality matters: it ranked first among 10 major US and Canadian airlines in a Cirium monthly ranking in May 2025.
At a glance
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Key differences
Network and hubs
United serves around 405 destinations on six continents from eight hubs: Chicago–O'Hare, Denver, Guam, Houston, Los Angeles, Newark, San Francisco and Washington–Dulles. Air Canada flies domestic, US transborder and international routes from Canadian airports. For US–Canada trips, United gives more US departure points, while Air Canada gives more Canadian ones. Both belong to Star Alliance, so connections with partners are possible either way.
Fleet
United's mainline fleet stands at 1,137 aircraft as of September 2026, with 581 on order, including Airbus A321neo and A321XLR, A350-900s and 787s. It has an all-Boeing wide-body fleet. Air Canada operates a mainline fleet plus a leisure-focused Air Canada Rouge fleet. Cabin layout varies by aircraft on both airlines, so check the aircraft type on your booking.
Baggage and fares
On Air Canada, Economy Basic tickets bought after 3 January 2025 for Canada, US, Mexico, Central America and Caribbean routes exclude a carry-on; only a personal item is allowed. For tickets bought from 13 April 2026, the first checked bag costs CA$45 (Prince of Travel). United's allowances also depend on fare, route and status, so check united.com for your fare before booking.
Reliability
Air Canada ranked first for punctuality among 10 major US and Canadian airlines in a Cirium monthly ranking for May 2025 (PAX News), after years near the bottom. Results vary month to month, so treat it as a recent improvement rather than a guarantee.
Premium cabins
United has 787-9s in service and more 787s on order, and some of its long-haul aircraft carry newer Polaris and Economy interiors. Not every United long-haul aircraft has the same interior, so check your flight's seat map.
Loyalty and alliances
Both airlines are in Star Alliance, so status with either gives lounge access and priority benefits on partner flights for eligible passengers. United's programme is MileagePlus; Air Canada's is Aeroplan, which in August 2026 was announced to receive a CA$2.5 billion minority investment (Investing.com). Pick the programme matching where you live and spend.
Frequently asked questions
Is United better than Air Canada?
Neither is better across the board. United has the bigger network and fleet, which suits US departures, while Air Canada suits Canadian departures and has recently ranked well for punctuality.
Does Air Canada include a carry-on bag?
Not on Economy Basic for Canada, US, Mexico, Central America and Caribbean routes on tickets bought after 3 January 2025; only a personal item is included. Higher fares differ, so check at booking.
Are United and Air Canada in the same alliance?
Yes, both are Star Alliance members, so you can connect between them and, if eligible, use alliance lounge benefits.
About United Airlines Read more
Overview
United Airlines is a major airline headquartered at Willis Tower in Chicago, Illinois. According to Wikipedia, it was formed in 1931 as a subsidiary of United Aircraft and Transport Corporation, which controlled a group of airmail carriers assembled by William Boeing. It is a subsidiary of United Airlines Holdings (Nasdaq: UAL) and was one of the five founding members of Star Alliance. Scott Kirby is chief executive. The airline reported revenue of US$59.1 billion for 2025.
Network and hubs
United serves around 405 destinations across six continents. Its hubs are Chicago–O'Hare, Denver, Guam, Houston–Intercontinental, Los Angeles, Newark, San Francisco and Washington–Dulles. Regional services are flown by independent carriers under the United Express brand. Through Star Alliance and its partners, the network extends further worldwide. Over the years United acquired Pan Am's Pacific routes (1985), its London Heathrow operation (1991) and its Latin America and Caribbean routes.
Fleet
As of September 2026, the United Airlines fleet consists of 1,137 mainline aircraft, the largest of any airline worldwide, according to Wikipedia citing Cirium. It operates a mix of Airbus and Boeing narrow-bodies and an all-Boeing wide-body fleet, with more wide-bodies than any other North American airline. Regional aircraft operated by United Express partners are not included in that figure.
On board
Cabin layouts, seat pitch, entertainment and Wi-Fi vary by aircraft type and route. These details were not verified for this profile, so check the United website for the aircraft on your flight.
Good to know
- Frequent-flyer programme: MileagePlus, which is linked to Star Alliance status benefits.
- Baggage allowances, change fees and lounge access depend on fare, route and status. Check the current rules on united.com before booking.
- Star Alliance membership allows connections and lounge access with partner airlines for eligible passengers.
About Air Canada Read more
Overview
Air Canada is the flag carrier and largest airline of Canada by fleet size and passengers carried. It was founded in 1937 as Trans-Canada Air Lines and is headquartered in the borough of Saint-Laurent, Montreal, Quebec. It is a member of Star Alliance. The airline remains in operation: it reported its second-quarter 2026 results in August 2026, alongside a announced CA$2.5 billion minority investment in its Aeroplan loyalty programme, according to Investing.com.
Network and hubs
Air Canada serves domestic, transborder (US) and international destinations from Canadian airports. Its full destination list is on Wikipedia. Hub details were not verified for this profile; check the airline's website for current route maps.
Fleet
The airline operates a mainline fleet and a leisure-oriented Air Canada Rouge fleet. The current number of aircraft is listed in the tables of the Q2 2026 management discussion and analysis. We could not confirm an exact total, so none is stated here. Some websites quote figures near 1,000 aircraft, which appear unreliable.
On board
Cabin layouts, seat pitch, meals, entertainment and Wi-Fi vary by aircraft type and route. These were not verified for this profile; check the airline's website for the aircraft on your flight.
Good to know
- Carry-on: Economy Basic tickets bought after 3 January 2025 for travel within Canada, to and from the US, and to and from Mexico, Central America and the Caribbean exclude a carry-on bag. A personal item is allowed.
- Checked bags: for tickets bought from 13 April 2026, the first checked bag costs CA$45 before tax, with a second bag at CA$60 on Economy Basic, Standard and Flex fares, per Prince of Travel. International fees were unchanged.
- Punctuality: Air Canada ranked first for on-time performance among 10 major US and Canadian airlines in a Cirium monthly ranking, after years near the bottom. Results vary month to month.
- Loyalty: the airline's programme is Aeroplan.
Fees and rules change often, so check the airline's official pages before booking.
Sources (4)
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