Best Flights starting from $333
from$333economy
St Louis (STL)
Wed, Sep 2
Roundtrip
Portland (PWM)
Sat, Sep 5
from$333economy
St Louis (STL)
Sat, Sep 5
Roundtrip
Portland (PWM)
Tue, Sep 8
from$361economy
St Louis (STL)
Sun, Sep 6
Roundtrip
Portland (PWM)
Wed, Sep 9
from$380economy
St Louis (STL)
Tue, Sep 1
Roundtrip
Portland (PWM)
Fri, Sep 4
from$401economy
St Louis (STL)
Mon, Sep 7
Roundtrip
Portland (PWM)
Thu, Sep 10
from$427economy
St Louis (STL)
Thu, Sep 3
Roundtrip
Portland (PWM)
Sun, Sep 6
from$427economy
St Louis (STL)
Fri, Sep 4
Roundtrip
Portland (PWM)
Mon, Sep 7
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Other Destinations
St Louis (STL) to Burbank (BUR) in September from $130
From $130
St Louis (STL) to Sacramento (Any) in September from $131
From $131
St Louis (STL) to Buffalo (BUF) in September from $135
From $135
St Louis (STL) to Albuquerque (ABQ) in September from $183
From $183
St Louis (STL) to Seattle (Any) in September from $189
From $189
St Louis (STL) to Calgary (YYC) in September from $196
From $196
Flights from Other Cities
Charleston (CHS) to Portland (PWM) in September from $128
From $128
Durham (RDU) to Portland (PWM) in September from $212
From $212
Nashville (BNA) to Portland (PWM) in September from $217
From $217
Denver (Any) to Portland (PWM) in September from $230
From $230
Washington, D.C. (BWI) to Portland (PWM) in September from $253
From $253
Denver (DEN) to Portland (PWM) in September from $349
From $349
✈️ Flight Guide: St Louis (STL) → Portland (PWM)
Complete travel information for your September journey
St. Louis Lambert International Airport (STL) in September sees steady travel with lighter summer crowds after Labor Day, though weekends and Cardinals home games can still increase traffic. Travelers flying STL to Portland International Jetport (PWM) in September find comfortable weather windows and competitive fares as shoulder-season demand rises for New England fall foliage trips later in the month.
Departing from St Louis (STL) FAQs
St. Louis Lambert International Airport (STL) is about 14 miles northwest of downtown St. Louis. You can take an airport shuttle, taxi, rideshare (Uber/Lyft), or drive and use on-site long-term parking. Allow at least 45–60 minutes travel time during morning or evening rush hours and extra time for Labor Day weekend crowds in September.
Direct nonstop flights between St. Louis Lambert International Airport (STL) and Portland International Jetport (PWM) are uncommon; most itineraries in September involve one connection, frequently through Boston (BOS), Chicago (ORD), or Philadelphia (PHL). Expect total travel time with a single stop to range from about 4.5 to 7 hours depending on connection times.
For domestic departures from St. Louis Lambert International Airport (STL) in September, arrive at least 90 minutes before your scheduled departure to allow time for parking, check-in, or security screening, especially around Labor Day weekend or Cardinals home games. If you need to check bags or are traveling during peak morning hours, add another 30 minutes.
St. Louis Lambert International Airport (STL) offers short-term and long-term parking garages adjacent to Concourses, economy surface lots, and cell phone waiting areas for pick-ups. In September, rates may be slightly lower than summer peak season, but reserve airport parking early or use off-site parking deals for the best rates.
Standby and same-day changes depend on the airline's policy and fare class; major carriers serving St. Louis Lambert International Airport (STL) often allow same-day standby or confirmed changes for a fee or for flexible fares. Contact your airline before traveling and check availability at the airport; being enrolled in the carrier’s loyalty program can increase your chances.
September travel at St. Louis Lambert International Airport (STL) can see spikes around Labor Day and local sports events, causing longer security lines and fuller flights. Weather-related delays are less common than winter months, but monitor airline alerts, sign up for notifications, and consider travel insurance or flexible fares for STL to PWM September trips.
Arriving at Portland International Jetport (PWM) in September offers access to coastal Maine during a prime shoulder-season window: fewer tourists than summer, comfortable temperatures, and the onset of fall foliage. Travelers from St. Louis can pair city breaks in Portland with day trips to Acadia National Park, Kennebunkport, and Boston.
Arriving at Portland (PWM) FAQs
Portland International Jetport (PWM) is small and efficient, with short walk times and quick baggage claim, making arrivals in September smooth. Expect pleasant fall weather, lighter beaches traffic, and day trips to nearby destinations such as Portland’s Old Port, Acadia National Park, Boston, and coastal towns like Kennebunkport or Ogunquit.
Portland International Jetport (PWM) is approximately 3 miles from downtown Portland, Maine (about a 10–15 minute drive) and roughly 170 miles from Acadia National Park (about a 3.5–4 hour drive). In September, consider renting a car at PWM to explore coastal Maine and watch early fall foliage near Acadia.
Cheap flights STL to PWM in September are common during mid-week travel and outside Labor Day weekend. Compare one-stop itineraries via Boston or Philadelphia, subscribe to fare alerts, and book 3–8 weeks out to capture shoulder-season discounts for Portland Maine flights.
September in Portland, Maine typically features crisp mornings and mild afternoons with average highs in the low to mid-60s°F (16–19°C). Early September remains pleasantly warm for coastal activities, while late September brings cooler nights and the beginning of fall foliage — pack layered clothing and a light waterproof jacket for coastal breezes.
From Portland International Jetport (PWM), you can rent a car, take regional buses, or use private shuttles to reach Boston (about 2 hours by car), Bangor (about 2 hours), and Portsmouth (about 45 minutes). In September, traffic is generally moderate but plan extra time for weekend events and late-afternoon travel.
Yes—September brings culinary events like Harvest on the Harbor in Portland and nearby Maine Lobster Festival in Rockland (early September), both popular for food and New England culture. Plan flights to Portland International Jetport (PWM) a few weeks in advance for better availability and book accommodations early for festival weekends.
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September Events & Festivals Near PWM and STL — Travel Planning
September hosts a mix of cultural and culinary events accessible from Portland International Jetport (PWM). Popular events include Harvest on the Harbor (Portland food festival), the Maine Lobster Festival in Rockland (early September), and the start of fall foliage season in Acadia National Park. In St. Louis, Labor Day events and ongoing Major League Baseball Cardinals games influence departure-day crowds at St. Louis Lambert International Airport (STL).
Best Time to Fly STL to PWM — September Weather & Fare Tips
The best time to fly STL to PWM for value and weather is late September through early October when New England fall foliage begins and airfare often remains lower than peak summer. For cheap fares, fly mid-week and avoid Labor Day weekend. If you want the warmest coastal weather, choose early September; if you prioritize fall colors and crisp air, plan travel for late September.
Direct vs Connecting Flights — STL to PWM Advice (September)
Direct flights (nonstop) are preferable for speed and convenience, but nonstop service between St. Louis Lambert International Airport (STL) and Portland International Jetport (PWM) is rare. Connecting flights offer more schedule flexibility and often lower fares in September. When choosing between direct vs. connecting, weigh total travel time, layover duration, and the reliability of connection hubs—Boston often has efficient short connections to PWM.
Airline Comparison for STL to PWM — September Flight Options
Major carriers that commonly serve the STL to PWM market via one-stop connections include American Airlines, Delta Air Lines, United Airlines and regional partners; Southwest may offer competing routes with connections through other cities. In September, compare fares, baggage fees, connection times, and loyalty benefits across carriers. Boston hub connections often provide the most efficient single-stop itineraries to Portland International Jetport (PWM).
September Seasonal Travel Tips — STL to PWM
September travel between St. Louis Lambert International Airport (STL) and Portland International Jetport (PWM) benefits from shoulder-season advantages: lower prices, milder weather, and less crowded attractions. Pack layers for changing coastal temperatures, reserve car rentals in advance, and check festival calendars. For COVID-era and general health safety, confirm airline and local guidelines ahead of travel.
Flight Time & Schedules — STL to PWM (September)
Average door-to-door travel time from St. Louis Lambert International Airport (STL) to Portland International Jetport (PWM) in September is typically 4.5 to 7 hours, depending on connection times. There are very few, if any, nonstop options; most flights connect once in hubs like Boston (BOS), Chicago O’Hare (ORD), Philadelphia (PHL), or Baltimore (BWI). Morning departures can minimize delays; late afternoon and evening connections occasionally see longer waits.
Cheap Flights STL to PWM in September — Deals & Booking Tips
To find cheap flights STL to PWM in September, search 3–8 weeks ahead and target mid-week departures (Tuesdays and Wednesdays) to capture lower fares. Use fare comparison tools, set Google Flights or Skyscanner alerts, and be open to one-stop itineraries through Boston (BOS), Chicago (ORD), or Philadelphia (PHL). Consider nearby departure flexibility from smaller regional airports if you can drive, and check budget-friendly carriers and seasonal promo codes.