Alajuela SJO to Seattle, WA SEA Flights

The earliest flight from Alajuela to Seattle, WA leaves at 1:40 AM. Plan your trip with the Journey Planner from Omio.

The latest flight from Alajuela to Seattle, WA leaves at 8:00 PM.

Yes, you can take a between Alajuela and Seattle, WA.

Since neither Alajuela nor Seattle, WA are in the Schengen Area, passport requirements depend on the specific immigration rules of Costa Rica 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 in winter and 1 h in summer between Alajuela and Seattle, WA.

The best events to attend in Seattle, WA include:

• Seafair, a summer festival featuring hydroplane races, parades, and cultural events
• Seattle International Film Festival, one of the largest film festivals in the U.S. showcasing independent films
• Bumbershoot, an annual music and arts festival held over Labor Day weekend
• Seattle Pride Parade, a celebration of LGBTQ+ pride with a colorful parade through downtown.

The best holidays to experience in Seattle, WA include:

• Independence Day, fireworks and celebrations marking the nation's birthday
• Thanksgiving, a time for family gatherings and seasonal festivities
• Christmas, holiday lights and decorations creating a festive atmosphere
• New Year's Eve, lively celebrations welcoming the new year with fireworks and events.

The best season to visit Seattle, WA is Spring or Fall. The best weather to explore Seattle, WA is during April-June or September-November.

For international flights we recommend to arrive 2.5 to 3 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.