$209 Find Cheap Flights from Montreal to St. Louis - Compare and Save

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

• Economy Class
• First Class

A nonstop flight from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis takes 00m, 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.

Round-trip flights from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis range from $493 to $737, with an average of $593 over the past 12 months. Anything below $493 counts as a good deal.

On this route, layover flights are cheaper than nonstop options on average. Layover fares average $346 round-trip via Philadelphia (PHL), compared to $667 for nonstop.

There is no standard. Checked-bag policies vary by airline on this route. Most carriers charge $35–$90 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 Air Canada and United Airlines. Other aircraft seen on the route include Embraer 175 variants.

Yes. Based on fares seen in the past 5 days, round-trip prices on this route showed a wide range, from about $423 to $1,588. That means the highest observed fare was about 4x higher than the lowest one.

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

One-way fares from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis are currently lower than usual. Average one-way flight prices are about $256, which is 32% below the typical average for this route.

Lambert-St Louis Airport (STL) hosts 5 major car rental companies, with daily rates averaging $78 for economy cars. Top options include:

• Hertz
• Budget
• Alamo
• Enterprise Rent-A-Car
• Payless

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

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

• Toronto Pearson Intl (YYZ) - 59% of one-stop connections
• Chicago O'Hare Intl (ORD) - 25% of one-stop connections
• Detroit Metropolitan Wayne County (DTW) - 12% of one-stop connections
• New York LaGuardia (LGA) - 1% of one-stop connections

Yes. Flexible dates can save you up to 31% on flights from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis. Thursday is the cheapest departure day at $567 round-trip on average, while Saturday is the most expensive at $811, a difference of $244.

KAYAK's flexible dates feature shows options up to 3 days before and after your selected dates, making it easier to compare nearby fares.

Flying via Detroit Metropolitan Wayne County (DTW) gives the shortest average 1-stop total travel time at 5h 04m, compared with 5h 08m via Philadelphia (PHL) and 5h 17m via Toronto Pearson Intl (YYZ).

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

Some of the most popular sights in St. Louis are Busch Stadium, Enterprise Center and America's Center Convention Complex. These are among the most viewed places in St. Louis on KAYAK.

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

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 in Economy Class class

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