Question 1

Which airlines offer extra legroom and free seat selection on St. Louis to Washington, D.C. flights?

Accepted Answer

Among airlines operating St. Louis to Washington, D.C. flights:

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

Extra legroom and free seat selection availability depends on fare class and route.

Question 2

What airlines fly from St. Louis to Washington, D.C.?

Accepted Answer

3 airlines operate flights between St. Louis and Washington, D.C.. The airlines offering nonstop flights on this route include:

• Southwest
• American Airlines
• United Airlines

Question 3

Which airports can I use when flying from St. Louis to Washington, D.C.?

Accepted Answer

Flights from St. Louis to Washington, D.C. usually depart from Lambert-St Louis (STL) and may arrive at several airports in Washington, D.C. area, including Washington, D.C. Reagan-National (DCA) and Washington, D.C. Dulles Intl (IAD).

Question 4

Which airlines include bags at no extra cost on St. Louis to Washington, D.C. flights?

Accepted Answer

Here are some options for this route, based on selected ticket types and cabin classes:

• Southwest: a cabin bag and a checked bag in Economy Class
• American Airlines: a cabin bag and a checked bag in Economy Class
• United Airlines: a cabin bag and a checked bag in First Class

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

Question 5

What cabin classes can I book on flights from St. Louis to Washington, D.C.?

Accepted Answer

Three cabin classes are available on flights from St. Louis to Washington, D.C.:

• Economy Class
• Business Class
• First Class

Question 6

How much can I save by taking a layover when flying from St. Louis to Washington, D.C.?

Accepted Answer

On this route, layover flights are cheaper than nonstop options on average. Layover fares average $204 round-trip via Denver Intl (DEN), compared to $372 for nonstop.

Question 7

What is the standard checked-bag allowance on flights from St. Louis to Washington, D.C.?

Accepted Answer

There is no standard. Checked-bag policies vary by airline on this route. Most carriers charge $40–$100 for the first checked bag in economy. Premium fares and elite-status bookings typically include a free checked bag.

Question 8

Which airports do connecting flights from St. Louis to Washington, D.C. pass through?

Accepted Answer

One-stop flights from St. Louis to Washington, D.C. most commonly connect through:

• Atlanta Hartsfield-Jackson (ATL) - 54% of one-stop connections
• Charlotte Douglas (CLT) - 14% of one-stop connections
• Detroit Metropolitan Wayne County (DTW) - 11% of one-stop connections
• Denver Intl (DEN) - 9% of one-stop connections

Question 9

Can I save money by using flexible dates for flights from St. Louis to Washington, D.C.?

Accepted Answer

Yes. Flexible dates can save you up to 31% on flights from St. Louis to Washington, D.C.. Thursday is the cheapest departure day at $324 round-trip on average, while Sunday is the most expensive at $469, a difference of $145.

KAYAK's flexible dates feature shows options up to 3 days before and after your selected dates, making it easier to compare nearby fares.

Question 10

How are flight departures from St. Louis to Washington, D.C. spread across the day?

Accepted Answer

Morning is the busiest departure period on St. Louis to Washington, D.C. flights, with 45% of flights leaving in that window. Afternoon departures account for 44%, evening flights for 11%, and night flights for 0%.

Question 11

What popular places can I visit in Washington, D.C.?

Accepted Answer

Some of the most popular sights in Washington, D.C. are Walter E. Washington Convention Center, National Mall and Capital One Arena. These are among the most viewed places in Washington, D.C. on KAYAK.

Question 12

What are the earliest and latest flights from St. Louis to Washington, D.C.?

Accepted Answer

These are the earliest and latest flight times available from St. Louis to Washington, D.C.:

• Earliest: departs at 6:00 am and lands at 8:03 am
• Latest: departs at 8:00 pm and lands at 10:03 pm.

The flight takes about 2h 03m.

Question 13

How expensive are last-minute St. Louis to Washington, D.C. flights?

Accepted Answer

Last-minute fares on this route (booked within two weeks of departure) run 78% above the $363 route average. Book 22 weeks before departure for the lowest fares.

Question 14

How long is a flight from St. Louis to Washington, D.C.?

Accepted Answer

A nonstop flight from St. Louis to Washington, D.C. takes 2h 03m, covering 717 miles.

Question 15

Do I need a passport to fly from St. Louis to Washington, D.C.?

Accepted Answer

No, a passport is not required for this domestic route, but you will need a real ID-compliant driver's license, a state ID or another TSA-accepted form of identification.

Question 16

How are flight prices from St. Louis to Washington, D.C. looking right now?

Accepted Answer

One-way fares from St. Louis to Washington, D.C. are currently lower than usual. Average one-way flight prices are about $110, which is 55% below the typical average for this route.

Question 17

How much time can I save by choosing a different layover airport from St. Louis to Washington, D.C.?

Accepted Answer

Flying via Detroit Metropolitan Wayne County (DTW) gives the shortest average 1-stop total travel time at 4h 24m, compared with 4h 39m via Charlotte Douglas (CLT) and 4h 52m via Chicago O'Hare Intl (ORD).

Question 18

What is the time difference between St. Louis and Washington, D.C.?

Accepted Answer

Washington, D.C. is 1 hour ahead of St. Louis (Eastern Time vs Central Time). Plan for the time shift when scheduling connections or first-day activities.

Question 19

What car rental options are available in Washington, D.C.?

Accepted Answer

Since Washington, D.C. is served by multiple airports, car rental options and rates can vary depending on which one you fly into.
Near Washington, D.C. Reagan-National Airport (DCA) — daily rates from around $24:

• Sixt
• Dollar
• Thrifty
• Hertz
• Alamo

Near Washington, D.C. Dulles Intl Airport (IAD) — daily rates from around $24:

• Dollar
• Hertz
• Budget
• Sixt
• Thrifty

Question 20

How much should I expect to pay for a St. Louis to Washington, D.C. flight?

Accepted Answer

Round-trip flights from St. Louis to Washington, D.C. range from $298 to $496, with an average of $363 over the past 12 months. Anything below $298 counts as a good deal.

Question 21

Which airlines offer Wi-Fi on St. Louis to Washington, D.C. flights?

Accepted Answer

Two airlines offer in-flight Wi-Fi on St. Louis to Washington, D.C. flights:

• American Airlines
• JetBlue

Pricing varies by airline and fare class. Some plans are included with the ticket or loyalty program; others are paid add-ons priced by flight length.

Question 22

How much is a round-trip flight from St. Louis to Washington, D.C.?

Accepted Answer

Round-trip flights from St. Louis to Washington, D.C. typically range from $298 to $496. The lowest price found in the past 5 days was $113, on Frontier.

Question 23

What is the cheapest St. Louis to Washington, D.C. flight route?

Accepted Answer

There's little price difference between St. Louis to Washington, D.C. routes. They average around $369 round-trip, based on KAYAK data over the past 12 months.

Question 24

What's the cheapest day of the week to fly from St. Louis to Washington, D.C.?

Accepted Answer

Based on deals KAYAK users found in the last 12 months, Thursday is the cheapest day of the week to fly from St. Louis to Washington, D.C.. It’s 11% cheaper than the average day, while Sunday is the most expensive, with prices 29% higher.

Question 25

What’s the cheapest month to fly from St. Louis to Washington, D.C.?

Accepted Answer

•October is the cheapest month to fly from St. Louis to Washington, D.C. at $312 round-trip.
•February ($447) and June ($395) are the most expensive months.
•The price difference between flying in the cheapest and most expensive months is 43% on average.
This is based on KAYAK aggregated and averaged internal data over the past 12 months.

Question 26

When are flights from St. Louis to Washington, D.C. the cheapest?

Accepted Answer

Flights from St. Louis to Washington, D.C. are cheapest 22 weeks before departure. Booking in this window typically costs about 58% less than the average last-minute fare (within 2 weeks of the flight), based on KAYAK data.

Question 27

Which airline is the cheapest to fly from St. Louis to Washington, D.C.?

Accepted Answer

Frontier ($113) and United Airlines ($258) are the cheapest airlines to fly round-trip from St. Louis to Washington, D.C. according to KAYAK data over the last 5 days.

Question 28

Which airline offers the most nonstop flights between St. Louis and Washington, D.C.?

Accepted Answer

Southwest and American Airlines offer the most frequent nonstop flights from St. Louis to Washington, D.C., at 27 and 20 flights per week respectively. United Airlines is another good option, operating 14 flights per week. Based on KAYAK flight data over the last 3 months.

Question 29

What’s the most popular layover airport when flying from St. Louis to Washington, D.C.?

Accepted Answer

Atlanta Hartsfield-Jackson (ATL) is the most popular layover for the St. Louis to Washington, D.C. route. 54% of KAYAK users who booked 1-stop round-trips over the past 3 months connected via ATL.

Question 30

What is the cheapest layover airport when flying from St. Louis to Washington, D.C.?

Accepted Answer

Flights via Denver Intl (DEN) offer the most affordable fares, with an average round-trip price of $204. Based on KAYAK data over the past 3 months.

Question 31

Which route with a layover is the fastest from St. Louis to Washington, D.C.?

Accepted Answer

Detroit Metropolitan Wayne County (DTW) offers the shortest 1-stop connection from St. Louis to Washington, D.C. at 4h 24m one-way, 2h 21m longer than the 2h 03m direct flight. Based on KAYAK data over the past 3 months.

Question 32

When flying from St. Louis to Washington, D.C. which airport offers the shortest layover?

Accepted Answer

Detroit Metropolitan Wayne County (DTW) had the shortest average connection time for St. Louis to Washington, D.C. layovers at 2h 46m over the past 3 months.

Question 33

How many nonstop flights run daily between St. Louis and Washington, D.C.?

Accepted Answer

There are 6 to 9 flights per day from St. Louis to Washington, D.C., about 60 flights per week. Monday has the most departures, with 15% of weekly flights.

Question 34

What time of day do most flights depart from St. Louis to Washington, D.C.?

Accepted Answer

Most nonstop flights from St. Louis to Washington, D.C. depart in the morning, accounting for 45% of nonstop departures. Around 4 flights are scheduled in that window over the next three months.

Low season	January
High season	June
Cheapest flight	$52

STL - WAS

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