Cheap flights from St. Louis to Washington, D.C. from $90
This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to Washington, D.C. departing on 5/28. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
Discover deals from 900+ travel sites with momondo.
Save money when you book flights with momondo
Big names and deals
Big names and deals
Search 100s of travel sites to compare prices.Filter for what you want
Filter for what you want
Free Wi-Fi? Stopover? Instantly customize your results.Trusted and free
Trusted and free
We’re completely free to use - no hidden charges or fees.Price Alerts
Price Alerts
Not ready to book? to track prices.Find the cheapest flights from St. Louis to Washington, D.C.
Cheap round-trip flights
Cheap one-way flights
Cheap last minute flights
Cheap direct flights
American Airlines flights from St. Louis to Washington, D.C. Reagan-National Airport
Our best American Airlines deals on St. Louis to Washington, D.C. Reagan-National Airport flight tickets
Southwest flights from St. Louis to Washington, D.C. Reagan-National Airport
Our best Southwest deals on St. Louis to Washington, D.C. Reagan-National Airport flight tickets
See travel insights to Washington, D.C. from
How to get the cheapest flight ticket from St. Louis to Washington, D.C. Reagan-National Airport
Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip
What is the cheapest month to fly to Washington, D.C. Reagan-National Airport?
The month of August is, on average, the cheapest month to fly to Washington, D.C. Reagan-National Airport from St. Louis, with most prices found around $262. If you aren’t able to travel to Washington, D.C. Reagan-National Airport during the month of August, then flying in September is also cheap. Prices for this month can be found on momondo for an average of $269.
What is the cheapest day to depart on your flight to Washington, D.C. Reagan-National Airport?
The cheapest day to depart from St. Louis to Washington, D.C. Reagan-National Airport is on a Saturday. Travelers who choose to depart for Washington, D.C. Reagan-National Airport on a Saturday will often find tickets for as low as $304. Flights from St. Louis to Washington, D.C. Reagan-National Airport on a Sunday will generally be more expensive and average around $414. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.
What is the cheapest time of day to depart on your flight to Washington, D.C. Reagan-National Airport?
Our data shows that the cheapest St. Louis to Washington, D.C. Reagan-National Airport flights are usually those with departure times in the evening. Our users have found flights to Washington, D.C. Reagan-National Airport in the evening for as low as $290. In contrast, the most expensive time of day to depart to Washington, D.C. Reagan-National Airport is in the afternoon when prices are around $335.
What is the cheapest Lambert-St Louis to Washington, D.C. Reagan-National flight route?
Fly from Lambert-St Louis to Washington, D.C. Reagan-National for the best Lambert-St Louis - Washington, D.C. Reagan-National flight prices
How far in advance should I book a flight to Washington, D.C. Reagan-National Airport?
You are more likely to see cheaper flights to Washington, D.C. Reagan-National Airport from St. Louis when booking 23 weeks ahead of your departure date. In general, you can expect to find flights to Washington, D.C. Reagan-National Airport for around $293 when searching 23 weeks out.However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Washington, D.C. Reagan-National Airport from St. Louis for as low as $220 on momondo.
What cabin class options are available on Lambert-St Louis to Washington, D.C. Reagan-National flights?
There are 2 cabin classes available to choose from on Lambert-St Louis to Washington, D.C. Reagan-National flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.
How many flights depart from St. Louis to Washington, D.C. Reagan-National Airport on average per day?
As of April 2025, there are 4 flights per day flying from St. Louis to Washington, D.C. Reagan-National Airport. The most common time of day flights depart is 6:00AM, with 48% of flights taking off at noon.
How many flights depart from St. Louis to Washington, D.C. Reagan-National Airport on average per week?
29 flights are operational weekly from St. Louis to Washington, D.C. Reagan-National Airport as of April 2025. The most popular departure day for this route is Mon, with 24% of flights per week taking off on this day.
When to book flights from St. Louis to Washington, D.C. Reagan-National Airport
Cheap St. Louis to Washington, D.C. Reagan-National Airport (STL to DCA) flight deals and tips
Find info about flight duration, direct flights, and airports for your flight from St. Louis to Washington, D.C. Reagan-National Airport
How far is Lambert-St Louis to Washington, D.C. Reagan-National by plane?
Washington, D.C. Reagan-National is 708.3 mi away from Lambert-St Louis. In terms of flight time, this usually takes a little over 1h 58m.
When did momondo last update prices for flights from Lambert-St Louis Airport to Washington, D.C. Reagan-National Airport?
Prices for flights from Lambert-St Louis Airport to Washington, D.C. Reagan-National Airport were last updated today.
How many operators does momondo search for flights from Lambert-St Louis Airport to Washington, D.C. Reagan-National Airport?
As of April 2025, there are 2 operators available to choose from for flights from Lambert-St Louis Airport to Washington, D.C. Reagan-National Airport.
How old do you have to be to fly from Lambert-St Louis Airport to Washington, D.C. Reagan-National Airport?
The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Lambert-St Louis Airport to Washington, D.C. Reagan-National Airport.
What documentation or ID do you need to fly to Washington, D.C. Reagan-National Airport?
The necessary travel and health documents for your Washington, D.C. Reagan-National Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.
What is the most popular plane model from St. Louis to Washington, D.C. Reagan-National Airport?
momondo data reveals that the most frequently booked plane model on the route from St. Louis to Washington, D.C. Reagan-National Airport is Canadair (Bombardier) Regional Jet 700, representing 20.85% of all bookings. The subsequent popular models are Boeing 737-700 Passenger/BBJ1 (winglets) at 19.76%, Boeing 737 MAX 8 at 18.30%, and Canadair (Bombardier) Regional Jet CRJ-550 at 13.47%.
What is the most popular airline from St. Louis to Washington, D.C. Reagan-National Airport?
Based on momondo bookings for this flight route, the most popular airline on flight routes from St. Louis to Washington, D.C. Reagan-National Airport is American Airlines (67% of total bookings). The next most popular airline is Southwest (33%).
Best airlines flying from St. Louis to Washington, D.C. Reagan-National Airport
Compare and see reviews for airlines that fly from St. Louis to Washington, D.C. Reagan-National Airport with momondo
| Airline | Rating | Free Cancellation | Price | ||
|---|---|---|---|---|---|
| PriceFrom $179 | Free Cancellation | Rating 7.2 10,000 reviews | |||
| PriceFrom $203 | Free Cancellation | Rating 8.0 4,295 reviews |
Southwest Flights From St. Louis to Washington, D.C. Reagan-National Airport
The lowest priced Southwest flight from St. Louis to Washington, D.C. Reagan-National Airport from the last 72 hours was $203. Generally, Southwest has 20 flights on this route every week with an average price of $303. Southwest is rated 8.0/10 by our users.
American Airlines Flights From St. Louis to Washington, D.C. Reagan-National Airport
The best American Airlines deal for St. Louis to Washington, D.C. Reagan-National Airport flight tickets found on momondo in the last 72 hours was $179, round-trip. It should be noted that an average American Airlines flight deal for this route in this time was higher, at $287 round-trip. American Airlines operates 9 flights out of St. Louis into Washington, D.C. Reagan-National Airport in an average week, so prices vary by time and availability. 10,000 American Airlines reviews by users on momondo have scored the airline at 7.2/10.
Traveling to a place near Washington, D.C.?
Book flights to Washington, D.C. if you plan to visit one of these locationsWhy use momondo?
Why should I use momondo to find a flight deal from St. Louis to Washington, D.C.?
momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from St. Louis to Washington, D.C.. Millions of users trust and use momondo every year so you are in good hands.
Can I find flights from St. Louis to Washington, D.C. with flexible booking policies on momondo?
Yes. momondo enables you to select and highlight flights to Washington, D.C. from St. Louis with this policy.
How can momondo help me find flights from St. Louis to Washington, D.C.?
Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Washington, D.C. from St. Louis.
I’m not ready to book a flight from St. Louis to Washington, D.C. right now. Can momondo alert me if prices change?
Price alerts on flights to Washington, D.C. from St. Louis are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.