HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news

$110+ Cheap flights from St. Louis (STL) to Dulles Intl (IAD)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 8/17. Fares are subject to change and may not be available on all flights or dates of travel.
STL — IAD
Jul 30 — Aug 61
From?
To?
Tue 7/30
Tue 8/6
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Leverage Cheapflights for Your Next Trip

1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”
2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.
3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

The best prices from Lambert-St Louis to Washington, D.C. Dulles Intl are usually found in March or August, booked 52 days in advance, depart on a Saturday or Monday and return on a Saturday

Cheap flight deals from St. Louis to Dulles Intl

Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to Dulles Intl (IAD). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated July 25, 2024.

Popular in

April

Cheapest in

March

Round-trip from

$219
(United Airlines)

One-way from

$110
(United Airlines)
High demand for flights, 18% potential price rise
Search Deals
Best time to find cheap flights, 12% potential price drop
Search Deals
From Lambert-St Louis to Washington, D.C. Dulles Intl
Search Deals
One-way flight from Lambert-St Louis to Washington, D.C. Dulles Intl
Search Deals

What is the cheapest day to fly round-trip from St. Louis to Washington, D.C. Dulles Intl Airport?

Flights from St. Louis to Washington, D.C. Dulles Intl Airport are found to be more expensive on Saturday. This shouldn't discourage you from searching as you can still find great deals by being flexible with your options. Use our search form to find deals on tickets to Washington, D.C. Dulles Intl Airport.

How far in advance should I book a flight from St. Louis to Washington, D.C. Dulles Intl Airport?

To save on the cost of your flight from St. Louis to Washington, D.C. Dulles Intl Airport, book at least 53 days before your planned departure. Booking around this time can save you about 87% on the cost of this flight compared to booking a flight leaving this week. We have found prices from $298 if you need a flight within two weeks. For flights within the next 72 hours, you can find tickets from as low as $502.

What is the cheapest month to fly from St. Louis to Washington, D.C. Dulles Intl Airport?

Due to multiple factors, expect to potentially pay more when booking in June. For low rates, January can be a great choice for travel to Washington, D.C. Dulles Intl Airport. Flights to Washington, D.C. Dulles Intl Airport from St. Louis in January are about $268 on average during January, but can be found for as low as $108.

What is the cheapest time of day to fly from STL to IAD?

It’s optimal to fly from St. Louis to Washington, D.C. Dulles Intl Airport in the evening. By choosing this option you can save up to 44% on the cost of your flight, compared to a flight at noon.

Cheap St. Louis to Dulles Intl flights in July & August 2024

Find cheap flight options from St. Louis to Dulles Intl specifically for the months of July and August 2024. Explore affordable fares based on user searches. Over the last 7 days, Cheapflights users made 2,752,877 searches. Prices were last updated on July 25, 2024.
The lowest fares we've come across on flights traveling from St. Louis to Washington, D.C. in July and August 2024. More deals are always being added, so be sure to check back regularly.
This United Airlines deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/218:25 amSTL - IAD
Nonstop2h 08mUnited Airlines
Wed 8/288:35 amIAD - STL
Nonstop2h 21mUnited Airlines
Deal found 7/24$219
This United Airlines deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/215:18 pmSTL - IAD
1 stop5h 57mUnited Airlines
Wed 8/288:35 amIAD - STL
Nonstop2h 21mUnited Airlines
Deal found 7/24$224
This deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/1510:09 amSTL - IAD
1 stop4h 48mDelta
Sun 8/186:10 amIAD - STL
1 stop3h 59mDelta
Deal found 7/24$226
This United Airlines deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/286:34 amSTL - IAD
1 stop4h 16mUnited Airlines
Sat 8/318:35 amIAD - STL
Nonstop2h 21mUnited Airlines
Deal found 7/24$229
This United Airlines deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/215:18 pmSTL - IAD
1 stop5h 57mUnited Airlines
Wed 8/286:30 amIAD - STL
1 stop6h 52mUnited Airlines
Deal found 7/24$234
This Delta deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/226:30 amSTL - IAD
1 stop3h 44mDelta
Thu 8/2910:05 amIAD - STL
1 stop4h 21mDelta
Deal found 7/25$238
This United Airlines deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/138:25 amSTL - IAD
Nonstop2h 10mUnited Airlines
Mon 8/266:30 amIAD - STL
1 stop4h 37mUnited Airlines
Deal found 7/23$239
This United Airlines deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/195:20 pmSTL - IAD
1 stop5h 55mUnited Airlines
Thu 8/226:30 amIAD - STL
1 stop4h 37mUnited Airlines
Deal found 7/24$244
This Delta deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/175:27 pmSTL - IAD
1 stop4h 36mDelta
Sun 8/186:10 amIAD - STL
1 stop3h 59mDelta
Deal found 7/25$257

St. Louis to Dulles Intl 2024 flight deals

Discover exclusive flight deals for travel between St. Louis and Dulles Intl in 2024. Find excellent offers based on user searches. Over the last 7 days, Cheapflights users made 2,752,877 searches. Data last updated July 25, 2024.
The lowest fares we've come across on flights traveling from St. Louis to Washington, D.C. in July and August 2024. More deals are always being added, so be sure to check back regularly.
This United Airlines deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/218:25 amSTL - IAD
Nonstop2h 08mUnited Airlines
Wed 8/288:35 amIAD - STL
Nonstop2h 21mUnited Airlines
Deal found 7/24$219
This United Airlines deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/215:18 pmSTL - IAD
1 stop5h 57mUnited Airlines
Wed 8/288:35 amIAD - STL
Nonstop2h 21mUnited Airlines
Deal found 7/24$224
This deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/1510:09 amSTL - IAD
1 stop4h 48mDelta
Sun 8/186:10 amIAD - STL
1 stop3h 59mDelta
Deal found 7/24$226
This United Airlines deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/286:34 amSTL - IAD
1 stop4h 16mUnited Airlines
Sat 8/318:35 amIAD - STL
Nonstop2h 21mUnited Airlines
Deal found 7/24$229
This United Airlines deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/215:18 pmSTL - IAD
1 stop5h 57mUnited Airlines
Wed 8/286:30 amIAD - STL
1 stop6h 52mUnited Airlines
Deal found 7/24$234
This Delta deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/316:00 pmSTL - IAD
1 stop4h 03mDelta
Sat 11/21:15 pmIAD - STL
1 stop4h 19mDelta
Deal found 7/24$238
This United Airlines deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/138:25 amSTL - IAD
Nonstop2h 10mUnited Airlines
Mon 8/266:30 amIAD - STL
1 stop4h 37mUnited Airlines
Deal found 7/23$239
This United Airlines deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/205:20 pmSTL - IAD
1 stop5h 57mUnited Airlines
Sun 9/228:35 amIAD - STL
Nonstop2h 21mUnited Airlines
Deal found 7/24$243
This United Airlines deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/195:20 pmSTL - IAD
1 stop5h 55mUnited Airlines
Thu 8/226:30 amIAD - STL
1 stop4h 37mUnited Airlines
Deal found 7/24$244

St. Louis to Dulles Intl flights leaving soon

Find last-minute flight options from St. Louis to Dulles Intl for spontaneous travel. Discover available flights and compare prices based on user searches. Secure great deals and offers for spontaneous trips with quick booking options. Over the last 7 days, Cheapflights users made 2,752,877 searches. Data last updated July 25, 2024.
Consider one of these great deals we found on last-minute flights from St. Louis to Washington, D.C.. Users should be sure to double check the price, date, and time of their last-minute flight.
This Delta deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/47:15 amSTL - IAD
1 stop5h 49mDelta
Sat 10/196:05 pmIAD - STL
1 stop4h 26mDelta
Deal found 7/25$373
This United deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/48:25 amSTL - IAD
Nonstop2h 10mUnited Airlines
Sat 10/196:30 amIAD - STL
1 stop4h 45mUnited Airlines
Deal found 7/25$434
This Delta deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/16:00 amSTL - IAD
1 stop7h 04mDelta
Tue 8/135:17 pmIAD - STL
1 stop4h 19mDelta
Deal found 7/25$443
This Delta deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/26:11 pmSTL - IAD
1 stop3h 55mDelta
Sun 8/46:00 amIAD - STL
1 stop6h 38mDelta
Deal found 7/25$508
This American Airlines deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/45:17 amSTL - IAD
1 stop6h 35mAmerican Airlines
Sat 10/195:00 amIAD - STL
2 stops11h 58mAmerican Airlines
Deal found 7/25$516
This United deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/48:25 amSTL - IAD
Nonstop2h 10mUnited Airlines
Sat 10/198:35 amIAD - STL
Nonstop2h 23mUnited Airlines
Deal found 7/25$524
This United Airlines deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/11:05 pmSTL - IAD
Nonstop2h 10mUnited Airlines
Thu 8/86:07 pmIAD - STL
Nonstop2h 19mUnited Airlines
Deal found 7/25$538
This United Airlines deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/33:43 pmSTL - IAD
2 stops18h 40mUnited Airlines
Tue 8/65:27 pmIAD - STL
1 stop6h 10mUnited Airlines
Deal found 7/24$547
This United Airlines deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/25:30 pmSTL - IAD
2 stops16h 53mUnited Airlines
Sun 8/46:30 amIAD - STL
1 stop4h 55mUnited Airlines
Deal found 7/25$549

One-way flights to Dulles Intl from St. Louis

Search for one-way flight options from St. Louis to Dulles Intl. Find affordable one-way fares based on user searches. Compare prices and availability to plan your one-way journey according to your preferred dates and budget. Over the last 7 days, Cheapflights users made 2,752,877 searches. Data last updated July 25, 2024.
If you're seeking multiple options on one-way flights from St. Louis to Washington, D.C., be sure to check out these deals, which are updated often. Users needing a return flight from St. Louis to Washington, D.C. should utilize the search form above.
This United Airlines deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/178:25 amSTL - IAD
Nonstop2h 10mUnited Airlines
Deal found 7/24$110
This United Airlines deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/235:20 pmSTL - IAD
1 stop5h 55mUnited Airlines
Deal found 7/24$115
This Delta deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/175:27 pmSTL - IAD
1 stop4h 36mDelta
Deal found 7/25$119
This United Airlines deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/78:25 amSTL - IAD
Nonstop2h 08mUnited Airlines
Deal found 7/24$134
This Delta deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/233:49 pmSTL - IAD
1 stop4h 38mDelta
Deal found 7/25$138
This United Airlines deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/248:25 amSTL - IAD
Nonstop2h 08mUnited Airlines
Deal found 7/24$145
This mytrip.com deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure mytrip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/1311:26 amSTL - IAD
3 stops22h 54mMultiple Airlines
Deal found 7/24$149
This Cheapflightsfares deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/206:04 amSTL - IAD
1 stop4h 52mSun Country Air
Deal found 7/25$150
This Sun Country Air deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Sun Country Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/27:55 pmSTL - IAD
1 stop16h 15mSun Country Air
Deal found 7/24$158

Find flights from St. Louis to Dulles Intl within your budget

Customize your flight search to find flights from St. Louis to Dulles Intl that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,752,877 searches. Data last updated July 25, 2024.

Fly from

Any airport

Fly to

Any airport

Budget

$219 - $326

Route

Depart

Return

Price

Lambert-St LouisWashington, D.C. Dulles Intl

STL - IAD

STLIAD

Lambert-St Louis

Wed 8/21

Nonstop2h 08m

Washington, D.C. Dulles Intl

Wed 8/28

Nonstop2h 21m

$219

Lambert-St LouisWashington, D.C. Dulles Intl

STL - IAD

STLIAD

Lambert-St Louis

Wed 8/21

1 stop5h 57m

Washington, D.C. Dulles Intl

Wed 8/28

Nonstop2h 21m

$224

Lambert-St LouisWashington, D.C. Dulles Intl

STL - IAD

STLIAD

Lambert-St Louis

Thu 8/15

1 stop4h 48m

Washington, D.C. Dulles Intl

Sun 8/18

1 stop3h 59m

$226

Lambert-St LouisWashington, D.C. Dulles Intl

STL - IAD

STLIAD

Lambert-St Louis

Wed 8/28

1 stop4h 16m

Washington, D.C. Dulles Intl

Sat 8/31

Nonstop2h 21m

$229

Lambert-St LouisWashington, D.C. Dulles Intl

STL - IAD

STLIAD

Lambert-St Louis

Thu 8/22

1 stop3h 44m

Washington, D.C. Dulles Intl

Sat 8/24

1 stop3h 59m

$238

Lambert-St LouisWashington, D.C. Dulles Intl

STL - IAD

STLIAD

Lambert-St Louis

Tue 9/10

1 stop6h 27m

Washington, D.C. Dulles Intl

Fri 9/13

1 stop4h 19m

$272

Lambert-St LouisWashington, D.C. Dulles Intl

STL - IAD

STLIAD

Lambert-St Louis

Thu 9/5

1 stop6h 53m

Washington, D.C. Dulles Intl

Sun 9/8

3 stops24h 37m

$276

Lambert-St LouisWashington, D.C. Dulles Intl

STL - IAD

STLIAD

Lambert-St Louis

Tue 9/10

1 stop4h 18m

Washington, D.C. Dulles Intl

Fri 9/13

1 stop4h 19m

$277

Lambert-St LouisWashington, D.C. Dulles Intl

STL - IAD

STLIAD

Lambert-St Louis

Tue 8/13

2 stops11h 05m

Washington, D.C. Dulles Intl

Wed 8/14

1 stop9h 05m

$326

Flights are sorted by cheapest first

Deals found on 7/24

How far ahead should I book a flight from St. Louis to Washington, D.C. Dulles Intl Airport?

Use this chart to determine the optimal time to book a round-trip flight from St. Louis to Dulles Intl. Price data was last updated on July 23, 2024.
The best time to book flights from St. Louis to Washington, D.C. Dulles Intl Airport is 51 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.
Search Deals

What is the cheapest day to fly from St. Louis to Washington, D.C. Dulles Intl Airport?

Use this chart to determine the cheapest time to fly round-trip from St. Louis to Dulles Intl. Price data was last updated on July 21, 2024.
Morning
Noon
Afternoon
Evening
All times are departure.
Travelers seeking maximum savings on their St. Louis to Washington, D.C. Dulles Intl Airport flight should consider departing on Saturday afternoons when fares are most often at their lowest. Friday at noon flights should be avoided if possible as fares are typically the most expensive at this time.
Search Deals

Best time to book a flight from St. Louis to Dulles Intl

Have a flexible travel schedule? Discover the best time to fly to Dulles Intl from St. Louis with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Temperature and rainfall in Dulles Intl by month

Plan your trip to Dulles Intl by taking into account the average temperature and rainfall totals by month.

WAS

Temperature

35.6 - 80.6 °F

If weather is an important factor for your trip to Washington, D.C. Dulles Intl Airport, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 80.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 35.6 F).

Reviews of airlines servicing Dulles Intl

Get insights into the airlines that provide service to Dulles Intl. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Dulles Intl. Reviews last updated July 25, 2024.
To help decide which airline to fly from St. Louis to Washington, D.C., see what other customers have to say about United Airlines, American Airlines and Delta. In addition to providing an overall rating, users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.2
Very good
5,641 reviews

Boarding

8.3

Comfort

8.1

Entertainment

7.8

Food

7.3

Overall

8.2

Crew

8.7

Reviews

1 / 10

Wish the there were an electrical outlet to plug the phone. it died within 10 minutes of being in the air.

Southwest
8.2
Very good
5,641 reviews
Southwest
8.2
Very good
5,641 reviews

Boarding

8.3

Comfort

8.1

Entertainment

7.8

Food

7.3

Overall

8.2

Crew

8.7

Reviews

1 / 10

Wish the there were an electrical outlet to plug the phone. it died within 10 minutes of being in the air.

Delta
8.0
Very good
9,630 reviews
Southwest
8.2
Very good
5,641 reviews

Boarding

8.3

Comfort

8.1

Entertainment

7.8

Food

7.3

Overall

8.2

Crew

8.7

Reviews

1 / 10

Wish the there were an electrical outlet to plug the phone. it died within 10 minutes of being in the air.

United Airlines
7.4
Good
10,000 reviews
Southwest
8.2
Very good
5,641 reviews

Boarding

8.3

Comfort

8.1

Entertainment

7.8

Food

7.3

Overall

8.2

Crew

8.7

Reviews

1 / 10

Wish the there were an electrical outlet to plug the phone. it died within 10 minutes of being in the air.

American Airlines
7.3
Good
10,000 reviews
Southwest
8.2
Very good
5,641 reviews

Boarding

8.3

Comfort

8.1

Entertainment

7.8

Food

7.3

Overall

8.2

Crew

8.7

Reviews

1 / 10

Wish the there were an electrical outlet to plug the phone. it died within 10 minutes of being in the air.

Sun Country Air
7.1
Good
515 reviews
Southwest
8.2
Very good
5,641 reviews

Boarding

8.3

Comfort

8.1

Entertainment

7.8

Food

7.3

Overall

8.2

Crew

8.7

Reviews

1 / 10

Wish the there were an electrical outlet to plug the phone. it died within 10 minutes of being in the air.

Related info for your journey

Find useful and relevant information for your journey from St. Louis to Dulles Intl. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from St. Louis to Washington, D.C. Dulles Intl?

    Most people fly from Lambert-St Louis (STL) if they book a flight from St. Louis to Washington, D.C. Dulles Intl. On average, Lambert-St Louis has 5 outbound flights to Washington, D.C. Dulles Intl per day from 3 airlines. Lambert-St Louis is conveniently located just 12.7 mi from St. Louis’s city center.

  • Can I find flights from St. Louis to Washington, D.C. Dulles Intl Airport for under $300 on Cheapflights?

    Yes, there are multiple flights from St. Louis to Washington, D.C. Dulles Intl Airport for under $300. The cheapest flight booked recently is on United Airlines for just $219, but on average you can expect to pay $254.

  • Are there nonstop flights from St. Louis to Washington, D.C. Dulles Intl Airport for under $300 on Cheapflights?

    Cheapflights has at least 20 direct flights from St. Louis to Washington, D.C. Dulles Intl Airport under $300. A good price for a nonstop flight from St. Louis to Washington, D.C. Dulles Intl Airport is less than $362.

  • Are there last-minute flights available from St. Louis to Washington, D.C. Dulles Intl Airport for under $400?

    There are currently 20+ open flights from St. Louis to Washington, D.C. Dulles Intl Airport within the next 7 days for less than $400.

  • What are the cheapest airlines flying from St. Louis to Washington, D.C. Dulles Intl Airport round-trip?

    Currently priced at $219, United Airlines will fly you from St. Louis to Washington, D.C. Dulles Intl Airport and back. In addition to United Airlines, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Delta and American Airlines - these airlines can fly you to your destination from $226 and $272, respectively. United Airlines is 43% cheaper than the average price of flights available within the next 90 days to this destination.

  • What are the cheapest airlines to fly from St. Louis to Washington, D.C. Dulles Intl Airport one-way?

    To fly one-way, consider booking your trip with United Airlines, which is currently one of the cheapest options available, starting at $110. Delta flights start at $119 while deals on Sun Country Air start at $150 one-way.

  • What are the most reliable airlines from St. Louis to Washington, D.C. Dulles Intl Airport?

    No one likes to see their flight delayed. When booking a flight from St. Louis to Washington, D.C. Dulles Intl Airport consider choosing United Airlines (94%), Brussels Airlines (92%) or GoJet (91%) as they are the most reliable in getting you off to your destination on time.

  • What are the cheapest flights from St. Louis to Washington, D.C. Dulles Intl Airport?

    On average you can expect to pay $1,711 for a flight from St. Louis to Washington, D.C. Dulles Intl Airport. The cheapest flight overall is $166 while the most popular route, (Lambert-St Louis - Washington, D.C. Dulles Intl) is currently priced at $226.

  • What does STL to IAD mean?

    This is defined as Lambert-St Louis Airport (STL) and Washington, D.C. Dulles Intl Airport (IAD). Codes like Washington, D.C. Dulles Intl Airport are often used to just call airports uniquely.

  • Can I find deals for flights from St. Louis to Dulles Intl that include extra baggage allowance?

    The amount of baggage you can bring on your St. Louis to Dulles Intl flight depends on the airline and the type of fare you've chosen. After entering your flight details, you'll be able to view the specific baggage policies for each deal in the search results. Keep in mind that certain deals may offer additional baggage allowance.

  • Can I find deals on flights from St. Louis to Dulles Intl with specific airlines?

    Yes, Cheapflights allows you to browse and filter St. Louis to Dulles Intl flight deals by airline. After entering your origin and destination, use the available filters to view flights offered by airlines.

  • Can I find deals for flights from St. Louis to Dulles Intl that include hotel bookings?

    Yes. In addition to deals on St. Louis to Dulles Intl flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from St. Louis to Dulles Intl?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from St. Louis to Dulles Intl.

  • Can I find deals for business class flights from St. Louis to Dulles Intl?

    Yes. Cheapflights offers flight deals from St. Louis to Dulles Intl by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • Can I find deals for flights from St. Louis to Dulles Intl that allow pets onboard?

    Many airlines flying from St. Louis to Dulles Intl offer the option to travel with pets. After selecting a flight deal, you can find more information about the airline's pet policy on their official website or by contacting the airline directly. Please note that additional fees and restrictions may apply.

  • Can I find deals on last-minute flights from St. Louis to Dulles Intl?

    Yes, you can often find last-minute deals on St. Louis to Dulles Intl flights on Cheapflights. However, these deals can vary and may not always be available. We recommend checking back frequently or signing up for price alerts for the most up-to-date deals.

  • How recently were the St. Louis to Washington, D.C. Dulles Intl Airport flight deals updated?

    The St. Louis to Washington, D.C. Dulles Intl Airport flight deals you see on this page were last updated on 7/24.

  • What are the most popular airlines that fly from St. Louis to Washington, D.C. Dulles Intl Airport?

    American Airlines, Delta and United Airlines are the most popular airlines when flying from St. Louis to Washington, D.C. Dulles Intl Airport.

  • What is the cheapest month to book a flight from St. Louis to Washington, D.C. Dulles Intl Airport?

    Currently, September is the cheapest month in which you can book a flight from St. Louis to Washington, D.C. Dulles Intl Airport (average of $278). Flying from St. Louis to Washington, D.C. Dulles Intl Airport in June is currently the most expensive (average of $378). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for St. Louis to Dulles Intl
See prices for flight routes from nearby airports that may be better suited for you.

Kansas City to Dulles Intl flights
Kansas City to Reagan-National flights
St. Louis to Reagan-National flights
Kansas City to Baltimore flights
St. Louis to Baltimore flights
Springfield to Baltimore flights
Springfield to Dulles Intl flights
Springfield to Reagan-National flights
Columbia to Baltimore flights
Joplin to Reagan-National flights
Joplin to Dulles Intl flights
Columbia to Reagan-National flights
Joplin to Baltimore flights
Columbia to Dulles Intl flights
Fort Leonard Wood to Baltimore flights
Fort Leonard Wood to Reagan-National flights

Top 3 airlines flying from St. Louis to Dulles Intl

Discover the top 3 airlines that operate flights from St. Louis to Dulles Intl. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,752,877 searches. Data last updated July 25, 2024.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$177Average$273FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$193Average$444FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$216Average$279FlexibilityNo cancel feeOn-time71%
Minneapolis to Las Vegas flights
Dallas to Austin flights
Salt Lake City to Orlando flights
Newark Airport to Cancún flights
New York to Rome flights
Dallas to El Paso flights
Boston to Dallas flights
Boston to Newark Airport flights
Dallas to Washington, D.C. flights
Boston to Salt Lake City flights
USA to Saudi Arabia flights
St. Louis to Niagara Falls, New York flights

Search flights from St. Louis to Dulles Intl by cabin class

Find flights from St. Louis to Dulles Intl, based on your preferred cabin class, be it economy, premium economy, business, or first class.
First Class
Business Class
Prem Econ Class
Economy Class

Hourly flight availability from St. Louis to Dulles Intl

Find hourly flight availability from St. Louis to Dulles Intl. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated July 25, 2024.
1%of flight departuresEarly morningMidnight to 6 am
55%of flight departuresMorning6 am to noon
44%of flight departuresAfternoonNoon to 6 pm
0%of flight departuresEvening6 pm to midnight
Midnight
6 AM
Noon
6 PM

Weekly flight availability from St. Louis to Dulles Intl

Explore weekly flight availability from St. Louis to Dulles Intl. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated July 25, 2024.
Sunday5daily flights
Monday6daily flights
Tuesday5daily flights
Wednesday6daily flights
Thursday5daily flights
Friday6daily flights
Saturday4daily flights

Book a flight to one of these trending destinations

User searches for flights to these destinations increased 20% or more in the past 90 days compared to other destinations
Flights to Abha
Flights to Komatsu
Flights to Skardu
Flights to Laayoune Hassan I
Flights to Aqaba King Hussein Intl
Flights to Nampula
Flights to Bourgas
Flights to Riverton
Flights to Alpena Phelps/Collins
Flights to Palmas
Flights to Newport State
Flights to Antofagasta Cerro Moreno
Flights to Nuku‘alofa Fua'Amotu Intl
Flights to Ndola
Flights to Fort Dodge
Flights to Miri
Flights to Rhinelander Oneida County
Flights to Seattle Lake Union Spb
Flights to Portsmouth Pease Intl
Flights to Tumbes
Flights to Jigiga
Flights to Diyarbakir
Flights to Akureyri
Flights to Brainerd Crow Wing County
100% Free
Cheapflights is completely free to use, so you can start saving the moment you arrive.
Book with Flexibility
Our users can plan ahead with confidence and find flights with no change fees
Travel Smart
Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.
View all available airlines