C$ 159 Find Cheap Flights from Seattle to St. Louis – Compare and Save

These are the earliest and latest flight times available from Seattle to St. Louis:

• Earliest: departs at 8:22 am and lands at 12:16 pm
• Latest: departs at 6:08 pm and lands at 10:02 pm.

The flight takes about 3h 54m.

Only Economy Class is available on flights from Seattle to St. Louis.

A direct flight from Seattle to St. Louis takes 3h 54m, covering 4,413 km.

No, a passport is not required for this domestic route, but you will need another form of identification, such as a driver's licence.

Round-trip flights from Seattle to St. Louis range from C$ 438 to C$ 847, with an average of C$ 625 over the past 12 months. Anything below C$ 438 counts as a good deal.

Last-minute fares on this route (booked within two weeks of departure) run 45% above the C$ 625 route average. Book 15 weeks before departure for the lowest fares.

On this route, layover flights are cheaper than direct options on average. Layover fares average C$ 336 round-trip via Chicago Midway (MDW), compared to C$ 660 for direct.

There is no standard. Checked bag policies vary by airline on this route. Most carriers charge C$ 56–C$ 140 for the first checked bag in economy. Premium fares and elite status bookings typically include a free checked bag.

The Boeing 737 family is used most often on this route, operated mainly by American Airlines. Other aircraft seen on the route include Boeing 737-800 Passenger/BBJ2 (winglets) variants.

Morning is the busiest departure period on Seattle to St. Louis flights, with 50% leaving in that window. Evening departures account for 50%, Afternoon flights for 0%, and Night flights for 0%.

Alaska Airlines is the only airline on the Seattle to St. Louis route offering in-flight Wi-Fi. Pricing depends on fare class.

One-way fares from Seattle to St. Louis are currently lower than usual. Average one-way flight prices are about C$ 193, which is 48% below the typical average for this route.

Lambert-St Louis Airport (STL) hosts 5 major car rental companies, with daily rates averaging C$ 109 for economy cars. Top options include:

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

Flights from Seattle to St. Louis usually depart from Seattle/Tacoma Intl (SEA) and arrive at Lambert-St Louis (STL).

One-stop flights from Seattle to St. Louis most commonly connect through:

• Denver Intl (DEN) – 40% of one-stop connections
• Salt Lake City (SLC) – 21% of one-stop connections
• Chicago O'Hare Intl (ORD) – 12% of one-stop connections
• Dallas/Fort Worth (DFW) – 10% of one-stop connections

Yes. Flexible dates can save you up to 40% on flights from Seattle to St. Louis. Tuesday is the cheapest departure day at C$ 531 round-trip on average, while Sunday is the most expensive at C$ 877, a difference of C$ 345.

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

Only Alaska Airlines operates flights between Seattle and St. Louis.

Flying via Salt Lake City (SLC) gives the shortest average 1-stop total travel time at 6h 35m, compared with 6h 53m via Minneapolis St Paul (MSP) and 7h 25m via Chicago O'Hare Intl (ORD).

St. Louis is 2 hours ahead of Seattle (Central Time vs Pacific Time). Plan for the time shift when scheduling connections or first-day activities.

Some of the most popular sights in St. Louis are Forest Park Hotel, Hyatt Regency St Louis At The Arch, and America's Center Convention Complex. These are among the most viewed places in St. Louis on KAYAK.

Among airlines operating Seattle to St. Louis flights:

• Alaska Airlines: offers extra legroom; offers free seat selection
• American Airlines: offers free seat selection
• Southwest: 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:

• Alaska Airlines: a carry-on bag and a checked bag in Economy Class
• American Airlines: a cabin bag in Economy Class class
• Southwest: a cabin bag in Economy Class class

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