Flights operate between St Louis (STL) and Washington (IAD).
1 airline operates this route with 2 flights daily flights.
Average flight time is 2h 06m - 2h 12m.
Route distance is 698 miles (1123 km).
Route Distance
698 miles (1123 km)
Average Duration
2h 06m - 2h 12m
Airlines Operating This Route
United Airlines
Flight Frequency
Daily Flights
2 flights
Weekly Flights
14
Typical Departure Time Ranges
Earliest Departure
08:25
Latest Departure
13:10
Route Intelligence Dashboard
Overall Connectivity Score
60
GoodRoute Diversity
1
Direct Routes
United Airlines serves 1 destination from STL
Weekly Frequency
14
Weekly Flights
Trend: Stable
Top 1 Most Frequent Routes - Details
| Route | Weekly Flights | Duration | Distance | Reliability |
|---|---|---|---|---|
| STL → Washington (IAD) (IAD) | 14/week | 2h 06m - 2h 12m | 698 km | Moderate |
Flight Schedule & Filters
United Airlines flights from Saint Louis (STL) to Washington (IAD)
United Airlines operates scheduled nonstop flights between Saint Louis (STL) and Washington (IAD). United Airlines operates 2 flights daily flights on this route.• Flight Duration: 2h 06m - 2h 12m (average flight time)• Distance: 698 miles (1123 km) (air miles between airports)• Daily Flights: 2 flights (scheduled departures per day)
Saint Louis (STL)
US
Washington (IAD)
US
FLIGHT TIME
2h 06m - 2h 12m
FLIGHT DISTANCE
698 miles (1123 km)
2h 7m - 2h 8m
08:25
13:10
698 miles (1123 km)
January
1 (Show)
14
United Airlines Terminal Information & Contact
Departure Terminal - Saint Louis (STL)
Terminal: 1
Phone: 1-800-864-8331
Location: 1, St Louis, US
Arrival Terminal - Washington (IAD)
Terminal: 1
Phone: 1-800-864-8331
Location: 1, Washington, US
United Airlines Flight Schedule from Saint Louis (STL) to Washington (IAD)
| Flight | Airline | Departure | Arrival | Aircraft |
|---|---|---|---|---|
UA4506 |  United Airlines | 08:25 | 11:33:00 | Canadair (Bombardier) Regional Jet 550 |
UA4454 | United Airlines | 13:10 | 16:17:00 | Canadair (Bombardier) Regional Jet 550 |
United Airlines Monthly Flight Calendar
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United Airlines Terminal Information
Departure Terminal at Saint Louis (STL):
• Terminal : United Airlines operates from this terminal
Terminal 1:
• United Airlines Terminal Phone: 1-800-864-8331
Arrival Terminal at Washington (IAD):
• Terminal : United Airlines operates from this terminal
Terminal 1:
• United Airlines Terminal Phone: 1-800-864-8331
Weather & Climate at Washington (IAD)
14.4°C
Avg Temperature88mm
Avg Rainfall10.3km/h
Avg Wind Speed66%
Avg HumidityBest Months to Visit
Challenging Months
12-Month Weather Overview
Wind Speed by Month
Humidity by Month
Best Time to Book Flights to Washington (IAD)
Best Booking Window
Book 2-3 months in advance for best prices
Booking Tip
Avoid booking during extreme weather months for better deals
Peak Travel Months
Expect higher prices and more crowds during these months. Book early to secure better rates.
Recommended Months
These months offer the best balance of weather, prices, and availability.
Monthly Booking Recommendations
Flight Price Trends for Washington (IAD)
Cheapest Months to Fly
Book flights during these months for the best deals and lowest prices.
Most Expensive Months
Prices are typically highest during these months. Consider booking well in advance or choosing alternative dates.
Price Trend Analysis
Prices are typically lower during shoulder seasons
Monthly Price Trends
Best Months to Fly United Airlines to Washington (IAD)
Best Months
Optimal conditions for travel with favorable weather, prices, and availability.
Shoulder Season
Transition periods with moderate conditions. Good balance of price and experience.
Challenging Months
These months may have less favorable conditions. Plan accordingly and book early.
Seasonal Insight
Best travel months: 2025-08
Seasonal Travel Calendar
United Airlines Contact Information and Customer Services
United Airlines Address
233 S. Wacker Drive
Chicago, IL 60606, United States
Customer Service Phone
+1-800-864-8331Official Website
united.comFrequently Asked Questions
How many United Airlines flights operate from St Louis (STL) to Washington (IAD)?
United Airlines operates 2 flights from St Louis (STL) to Washington (IAD).
What city does Washington (IAD) airport serve?
Washington (IAD) airport serves Washington, US.
How long is the United Airlines flight from St Louis (STL) to Washington (IAD)?
The flight duration is approximately 2h 06m - 2h 12m.
What is the distance from St Louis (STL) to Washington (IAD)?
The distance is 698 miles (1123 km).
What aircraft does United Airlines use on this route?
United Airlines uses Canadair (Bombardier) Regional Jet 550 on this route.
What are the earliest and latest United Airlines flight departure times?
The earliest United Airlines flight departs at 08:25 and the latest departs at 13:10.
Which terminal does United Airlines use at St Louis (STL)?
United Airlines flights from St Louis (STL) depart from Terminal 1. Terminal 1 phone: 1-800-864-8331.
View all United Airlines flights to St Louis (STL) →
Popular United Airlines routes from St Louis include multiple destinations.
Route data verified regularly by Triposia Travel Research Team.