$165 Find Cheap Flights from St. Louis to Montreal - Compare and Save

Among airlines operating St. Louis to Montreal Pierre Elliott Trudeau Intl Airport flights:

• Air Canada: offers extra legroom; offers free seat selection
• United Airlines: offers free seat selection

Extra legroom and free seat selection availability depends on fare class and route.

Only Air Canada operates flights between St. Louis and Montreal Pierre Elliott Trudeau Intl Airport.

Flights from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport usually depart from Lambert-St Louis (STL) and arrive at Montreal Pierre Elliott Trudeau Intl (YUL).

Here are some options for this route, based on selected ticket types and cabin classes:

• Air Canada: a cabin bag and a checked bag in Economy Class
• United Airlines: a cabin bag and a checked bag in Economy Class

Bag allowance can vary by ticket type, cabin class, route and airline, so travelers should check the fare details before booking.

Three cabin classes are available on flights from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport:

• Economy Class
• Business Class
• First Class

On this route, layover flights are cheaper than nonstop options on average. Layover fares average $650 round-trip via Charlotte Douglas (CLT), compared to $755 for nonstop.

There is no standard. Checked-bag policies vary by airline on this route. Most carriers charge $40–$65 for the first checked bag in economy. Premium fares and elite-status bookings typically include a free checked bag.

The Canadair (Bombardier) Regional Jet 900 family is used most often on this route, operated mainly by United Airlines and Air Canada. Other aircraft seen on the route include Boeing 787-8 Dreamliner variants.

One-stop flights from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport most commonly connect through:

• Detroit Metropolitan Wayne County (DTW) - 37% of one-stop connections
• Chicago O'Hare Intl (ORD) - 30% of one-stop connections
• Toronto Pearson Intl (YYZ) - 19% of one-stop connections
• Philadelphia (PHL) - 7% of one-stop connections

Detroit Metropolitan Wayne County (DTW) handles the largest share of one-stop connections on this route.

On the St. Louis to Montreal Pierre Elliott Trudeau Intl Airport route, being flexible with your departure day can save you up to 16%. Saturday is the cheapest day at $639 round-trip on average, while Sunday is the most expensive at $754: a $115 difference. Cheaper weekend fares like these are typical of routes dominated by weekday business travel.

Some of the most popular sights in Montreal Pierre Elliott Trudeau Intl Airport are Centre Bell, Vieux-Port de Montréal and Palais des congres de Montreal. These are among the most viewed places in Montreal Pierre Elliott Trudeau Intl Airport on KAYAK.

These are the earliest and latest flight times available from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport:

• Earliest: departs at 12:10 pm and lands at 2:41 pm
• Latest: departs at 12:10 pm and lands at 2:41 pm.

The flight takes about 2h 31m.

A nonstop flight from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport takes 2h 31m, covering 967 miles.

Yes, a valid passport is required for this international route. Many destinations require at least six months of validity beyond your travel dates. Check your passport expiry well before booking.

Yes. Based on fares seen in the past 5 days, round-trip prices on this route showed a wide range, from about $537 to $1,312. That means the highest observed fare was about 2x higher than the lowest one.

One-way fares from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport are currently lower than usual. Average one-way flight prices are about $276, which is 27% below the typical average for this route.

Flying via Detroit Metropolitan Wayne County (DTW) gives the shortest average 1-stop total travel time at 4h 38m, compared with 5h 12m via Toronto Pearson Intl (YYZ) and 5h 24m via Philadelphia (PHL).

Montreal Pierre Elliott Trudeau Intl Airport is 1 hour ahead of St. Louis (Eastern Time vs Central Time). Plan for the time shift when scheduling connections or first-day activities.

Montreal Pierre Elliott Trudeau Intl Airport (YUL) hosts 5 major car rental companies, with daily rates starting from around $12 for economy cars. Top options include:
• Routes Car & Truck Rentals
• Alamo
• Thrifty
• Hertz
• Avis

Round-trip flights from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport range from $624 to $846, with an average of $684 over the past 12 months. Anything below $624 counts as a good deal.

Air Canada is the only airline on the St. Louis to Montreal Pierre Elliott Trudeau Intl Airport route offering in-flight Wi-Fi. Pricing depends on fare class.