$128 Find Cheap Flights from Washington Dulles Airport to St. Louis - Compare and Save

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

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

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

Only United Airlines operates flights between Washington, D.C. Dulles Intl Airport and St. Louis.

Flights from Washington, D.C. Dulles Intl Airport to St. Louis usually depart from Washington, D.C. Dulles Intl (IAD) and arrive at Lambert-St Louis (STL).

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

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

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

Two cabin classes are available on flights from Washington, D.C. Dulles Intl Airport to St. Louis:

• Economy Class
• First Class

On this route, layover flights are cheaper than nonstop options on average. Layover fares average $329 round-trip via Atlanta Hartsfield-Jackson (ATL), compared to $544 for nonstop.

There is no standard. Checked-bag policies vary by airline on this route. Most carriers charge $40–$80 for the first checked bag in economy. Premium fares and elite-status bookings typically include a free checked bag.

The Canadair (Bombardier) Regional Jet CRJ-550 family is used most often on this route, operated mainly by United Airlines. Other aircraft seen on the route include Canadair (Bombardier) Regional Jet 900 variants.

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

• Atlanta Hartsfield-Jackson (ATL) - 56% of one-stop connections
• Chicago O'Hare Intl (ORD) - 18% of one-stop connections
• Charlotte Douglas (CLT) - 16% of one-stop connections
• Detroit Metropolitan Wayne County (DTW) - 11% of one-stop connections

Atlanta Hartsfield-Jackson (ATL) handles the largest share of one-stop connections on this route.

On the Washington, D.C. Dulles Intl Airport to St. Louis route, being flexible with your departure day can save you up to 47%. Saturday is the cheapest day at $399 round-trip on average, while Monday is the most expensive at $749: a $350 difference. Cheaper weekend fares like these are typical of routes dominated by weekday business travel.

Morning is the busiest departure period on Washington, D.C. Dulles Intl Airport to St. Louis flights, with 50% of flights leaving in that window. Evening departures account for 50%, afternoon flights for 0%, and night flights for 0%.

Some of the most popular sights in St. Louis are Downtown St. Louis, Busch Stadium and Enterprise Center. These are among the most viewed places in St. Louis on KAYAK.

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

• Earliest: departs at 8:20 am and lands at 10:49 am
• Latest: departs at 5:55 pm and lands at 8:24 pm.

The flight takes about 2h 29m.

A nonstop flight from Washington, D.C. Dulles Intl Airport to St. Louis takes 2h 29m, covering 694 miles.

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.

Yes. Based on fares seen in the past 5 days, round-trip prices on this route showed a wide range, from about $237 to $2,019. That means the highest observed fare was about 9x higher than the lowest one.

One-way fares from Washington, D.C. Dulles Intl Airport to St. Louis are currently lower than usual. Average one-way flight prices are about $143, which is 37% below the typical average for this route.

Flying via Detroit Metropolitan Wayne County (DTW) gives the shortest average 1-stop total travel time at 4h 44m, compared with 5h 01m via Charlotte Douglas (CLT) and 5h 02m via Chicago O'Hare Intl (ORD).

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

Lambert-St Louis Airport (STL) hosts 5 major car rental companies, with daily rates starting from around $31 for economy cars. Top options include:
• Hertz
• Budget
• Alamo
• Enterprise Rent-A-Car
• Payless

Round-trip flights from Washington, D.C. Dulles Intl Airport to St. Louis range from $339 to $635, with an average of $458 over the past 12 months. Anything below $339 counts as a good deal.