SeaTac, WA SEA to St. Louis, MO STL Flights

The earliest flight from SeaTac, WA to St. Louis, MO leaves at 1:14 AM. Plan your trip with the Journey Planner from Omio.

The latest flight from SeaTac, WA to St. Louis, MO leaves at 11:58 PM.

Yes, you can take a bus between SeaTac, WA and St. Louis, MO.

Since neither SeaTac, WA nor St. Louis, MO are in the Schengen Area, passport requirements depend on the specific immigration rules of United States and United States. Entry and visa requirements can be subject to change. For the latest information, check with your destination's embassy or consulate.

There is a time difference of 2 h between SeaTac, WA and St. Louis, MO all year round.

The best events to attend in St. Louis, MO include:

• St. Louis Mardi Gras, a vibrant celebration featuring parades, live music, and festive activities in the Soulard neighborhood
• St. Louis Art Fair, an annual event showcasing local and national artists with art exhibits, live performances, and culinary delights
• Fair St. Louis, a multi-day Independence Day festival with fireworks, concerts, and family-friendly activities along the Gateway Arch.

The best holidays to experience in St. Louis, MO include:

• Independence Day, vibrant fireworks and festive celebrations throughout the city
• Labor Day, pleasant weather and various outdoor activities
• Thanksgiving, a time for family gatherings with a charming autumn atmosphere.

The best season to visit St. Louis, MO is Spring or Fall. The best weather to explore St. Louis, MO is during April-May or September-October.

For domestic flights we recommend to arrive 1.5 to 2 hours before departure. Please check the website of your departure airport if in doubt. Some airports may offer booking time slots for security checks or offer additional information on when to get there based on time of day.

Most airlines permit carry-on bags that fit within specific dimensions (e.g., 22 x 14 x 9 inches or 56 x 36 x 23 cm), including handles and wheels. Bags must fit in the overhead bin or under the seat in front of you.

Many airlines impose weight limits, commonly ranging between 7 kg (15 lbs) and 12 kg (26 lbs). Typically, passengers are allowed one carry-on bag and one personal item (for example a purse, laptop bag, or backpack). Personal items must fit under the seat in front of you. Budget Airlines (like Ryanair or Wizz Air) have stricter size and weight limits, often requiring fees for larger carry-ons. Full-Service Airlines have more lenient policies, sometimes including more spacious dimensions or higher weight limits depending on your ticket class.

The list of items prohibited on an airplane varies by country and airline, but in general, the following items are not allowed in carry-on or checked baggage: Weapons and self-defence items, sharp objects, flammable materials, explosives, toxic substances, or liquids over 100ml (except for medications and baby essentials). In checked baggage, firearms (without authorization), explosives, large lithium batteries, and hazardous chemicals are prohibited. Electronic cigarettes must be in carry-on bags, while alcohol and dry ice have restrictions. Always check with your airline for specific regulations.