Cheap flights from Washington, D.C. Reagan-National Airport to St. Louis from $85
This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Washington, D.C. Reagan-National Airport to St. Louis departing on 10/7. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Southwest flights from Washington, D.C. Reagan-National Airport to St. Louis
Our best Southwest deals on Washington, D.C. Reagan-National Airport to St. Louis flight tickets
Frontier flights from Washington, D.C. Reagan-National Airport to St. Louis
Our best Frontier deals on Washington, D.C. Reagan-National Airport to St. Louis flight tickets
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How to get the cheapest flight ticket from Washington, D.C. Reagan-National Airport to St. Louis
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 St. Louis?
In general, February is the cheapest month to fly from Washington, D.C. Reagan-National Airport to St. Louis. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $270. The month of July is another great option to travel to St. Louis, with average flight prices from Washington, D.C. Reagan-National Airport averaging around $287.
What is the cheapest day to depart on your flight to St. Louis?
The cheapest day to depart on your flight to St. Louis is on a Wednesday when prices can be found for as low as $350. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Sunday because tickets tend to average around $406. These prices are subject to change though, so be sure to set up a Price Alert for flights to St. Louis.
What is the cheapest time of day to depart on your flight to St. Louis?
Flying to St. Louis from Washington, D.C. Reagan-National Airport in the evening is the least expensive time of day to depart. momondo users have found prices as low as $315 when looking at flights departing in the evening. In the afternoon is when there is more demand to fly to St. Louis, so prices are often more expensive at around $385 per ticket.
What is the cheapest Washington, D.C. Reagan-National to Lambert-St Louis flight route?
Fly from Washington, D.C. Reagan-National to Lambert-St Louis for the best Washington, D.C. Reagan-National - Lambert-St Louis flight prices
How far in advance should I book a flight to St. Louis?
You are more likely to see cheaper flights to St. Louis from Washington, D.C. Reagan-National Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to St. Louis for around $328 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to St. Louis from Washington, D.C. Reagan-National Airport for as low as $255 on momondo.
What cabin class options are available on Washington, D.C. Reagan-National to Lambert-St Louis flights?
There are 3 cabin classes available to choose from on Washington, D.C. Reagan-National to Lambert-St Louis flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.
What is the cheapest airline that flies from Washington, D.C. Reagan-National to Lambert-St Louis?
Frontier, American Airlines, and Southwest are the most popular carriers operating from Washington, D.C. Reagan-National to Lambert-St Louis
What airlines fly to St. Louis?
American Airlines, Southwest and Delta are the top three most popular airlines that fly to St. Louis from Washington, D.C. Reagan-National Airport according to our data. American Airlines is the first choice among our users, with 51% of people opting to fly with this airline when traveling to St. Louis. Keep in mind that there are 3 different airlines that fly to St. Louis on a routine basis, so you have a few additional options to choose from.
How many flights depart from Washington, D.C. Reagan-National Airport to St. Louis on average per day?
4 flights are operational daily from Washington, D.C. Reagan-National Airport to St. Louis as of July 2025. The most popular departure time for this route is 8:00AM, with 38% of flights per day taking off in the afternoon.
How many flights depart from Washington, D.C. Reagan-National Airport to St. Louis on average per week?
32 flights are operational weekly from Washington, D.C. Reagan-National Airport to St. Louis as of July 2025. The most popular departure day for this route is Mon, with 25% of flights per week taking off on this day.
When to book flights from Washington, D.C. Reagan-National Airport to St. Louis
Cheap Washington, D.C. Reagan-National Airport to St. Louis (DCA to STL) flight deals and tips
Find info about flight duration, direct flights, and airports for your flight from Washington, D.C. Reagan-National Airport to St. Louis
How far is Washington, D.C. Reagan-National to Lambert-St Louis by plane?
Washington, D.C. Reagan-National and Lambert-St Louis are 708.3 mi apart from one another. In terms of flight time, this usually takes a little over 2h 10m.
When did momondo last update prices for flights from Washington, D.C. Reagan-National Airport to Lambert-St Louis Airport?
Prices for flights from Washington, D.C. Reagan-National Airport to Lambert-St Louis Airport were last updated today.
How many operators does momondo search for flights from Washington, D.C. Reagan-National Airport to Lambert-St Louis Airport?
As of July 2025, there are 3 operators available to choose from for flights from Washington, D.C. Reagan-National Airport to Lambert-St Louis Airport.
How old do you have to be to fly from Washington, D.C. Reagan-National Airport to Lambert-St Louis Airport?
The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Washington, D.C. Reagan-National Airport to Lambert-St Louis Airport.
What documentation or ID do you need to fly to Lambert-St Louis Airport?
The travel and health documents required for your trip to Lambert-St Louis Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Lambert-St Louis Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.
What is the most popular plane model from Washington, D.C. Reagan-National Airport to St. Louis?
Based on momondo bookings for this flight route, the most popular plane model on flight routes from Washington, D.C. Reagan-National Airport to St. Louis is Boeing 737-700 Passenger/BBJ1 (winglets) (16.57% of total bookings). The next most popular plane models are Boeing 737 MAX 8 (16.45%), Canadair (Bombardier) Regional Jet 700 (15.55%), and Airbus A319 (14.71%).
What is the most popular airline from Washington, D.C. Reagan-National Airport to St. Louis?
momondo data reveals that the most frequently booked airline on the route from Washington, D.C. Reagan-National Airport to St. Louis is American Airlines, representing 49% of all bookings. The subsequent popular airlines are Southwest at 48% and Delta at 3%.
Best airlines flying from Washington, D.C. Reagan-National Airport to St. Louis
Compare and see reviews for airlines that fly from Washington, D.C. Reagan-National Airport to St. Louis with momondo
| Airline | Rating | Free Cancellation | Price | ||
|---|---|---|---|---|---|
| PriceFrom $198 | Free Cancellation | Rating 8.0 4,272 reviews | |||
| PriceFrom $198 | Free Cancellation | Rating 7.2 10,000 reviews | |||
| PriceFrom $223 | Free Cancellation | Rating 8.0 7,983 reviews |
Southwest Flights From Washington, D.C. Reagan-National Airport to St. Louis
Southwest flies from Washington, D.C. Reagan-National Airport to St. Louis around 23 times per week, with 4,272 momondo users rating the airline 8.0/10. The cheapest Southwest deal from Washington, D.C. Reagan-National Airport to St. Louis in the last 72 hours was $198 (round-trip), much lower than the average airfare cost of $318 for Southwest flights on this route.
American Airlines Flights From Washington, D.C. Reagan-National Airport to St. Louis
American Airlines (7.2/10 from 10,000 reviews) operates around 9 flights from Washington, D.C. Reagan-National Airport to St. Louis in any given week. The average American Airlines airfare for this route is around $346, with deals from around $198 rare but found on momondo. Referenced prices are for round-trip Washington, D.C. Reagan-National Airport to St. Louis flight searches in the last 72 hours.
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Why should I use momondo to find a flight deal from Washington, D.C. to St. Louis?
momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Washington, D.C. to St. Louis. Millions of users trust and use momondo every year so you are in good hands.
Can I find flights from Washington, D.C. to St. Louis with flexible booking policies on momondo?
Yes. momondo enables you to select and highlight flights to St. Louis from Washington, D.C. with this policy.
How can momondo help me find flights from Washington, D.C. to St. Louis?
momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Washington, D.C. to St. Louis.
I’m not ready to book a flight from Washington, D.C. to St. Louis right now. Can momondo alert me if prices change?
Price alerts on flights to St. Louis from Washington, D.C. 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.