In terms of precipitation, rainfall in Washington, D.C. Dulles Intl Airport ranges from 2.6 - 4.0 inches per month. May is typically the wettest month, when rainfall can reach 4.0 in. February is typically the driest time to visit Washington, D.C. Dulles Intl Airport when rainfall is around 2.6 in.

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).

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

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Waterloo, Iowa to Washington, D.C. Dulles Intl Airport as you normally would.

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

If you book a flight to Washington, D.C. Dulles Intl from Waterloo, you will be flying from Waterloo, which is the city’s only airport. Waterloo (ALO) is located 5.3 mi from the center of Waterloo. There are 0 flights from Waterloo to Washington, D.C. Dulles Intl per day from 0 different airlines.

Can I find deals for flights from Waterloo to Dulles Intl that include hotel bookings?

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

How can I find direct flights from Waterloo to Dulles Intl?

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

Can I find deals for business class flights from Waterloo to Dulles Intl?

Yes. Cheapflights offers flight deals from Waterloo 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.

$516+ Cheap Flights from Waterloo, IA to Washington, D.C. Dulles Intl Airport

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Cheap flight deals from Waterloo to Dulles Intl

Round-trip from	$529 (American Airlines)
One-way from	$516 (American Airlines)

From Waterloo to Washington, D.C. Dulles Intl

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Cheapest flights from Waterloo to Dulles Intl
Explore the most affordable flight options available from Waterloo to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 20, 2025.

Sat 12/132:51 pmALO - IAD

2 stops8h 04mAmerican Airlines

Tue 12/165:00 amIAD - ALO

2 stops10h 20mAmerican Airlines

Deal found 8/17

$529

Best flights from Waterloo to Dulles Intl
Discover carefully curated flight deals from Waterloo to Dulles Intl that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 20, 2025.

Sat 12/132:51 pmALO - IAD

2 stops8h 04mAmerican Airlines

Tue 12/165:00 amIAD - ALO

2 stops10h 20mAmerican Airlines

Deal found 8/17

$529

Last-minute flights from Waterloo to Dulles Intl
Discover last-minute flight deals from Waterloo to Dulles Intl. Data last updated August 20, 2025 and is based on user searches.

Mon 8/253:14 pmALO - IAD

2 stops6h 42mAmerican Airlines

Tue 9/210:25 amIAD - ALO

2 stops10h 05mAmerican Airlines

Deal found 8/20

$517

One-way flights from Waterloo to Dulles Intl
Search for one-way flight options from Waterloo to Dulles Intl. Find affordable one-way fares based on user searches. Data last updated August 20, 2025.

Mon 9/13:14 pmALO - IAD

2 stops7h 38mAmerican Airlines

Deal found 8/19

$516

Cheapflights Fare Finder

Use the filters below to find and compare flights from Waterloo to Washington, D.C. Dulles Intl Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

WaterlooWashington, D.C.

ALO - IAD

ALOIAD

Waterloo

Sat 12/13

2:51 pm-11:55 pm

2 stops8h 04m

Washington, D.C. Dulles Intl

Tue 12/16

5:00 am-2:20 pm

2 stops10h 20m

$529

WaterlooWashington, D.C.

ALO - IAD

ALOIAD

Waterloo

Mon 9/1

3:14 pm-11:52 pm

2 stops7h 38m

$516

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/19

Best time to book a flight from Waterloo to Dulles Intl

Have a flexible travel schedule? Discover the best time to fly to Dulles Intl from Waterloo 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.

Cheapflights Insights

Everything you need to know about your flight from Waterloo to Washington, D.C. Dulles Intl Airport

What is the cheapest month to book a flight from Waterloo, Iowa to Washington, D.C. Dulles Intl Airport?

Currently, July is the cheapest month in which you can book a flight from Waterloo, Iowa to Washington, D.C. Dulles Intl Airport (average of $303). Flying from Waterloo, Iowa to Washington, D.C. Dulles Intl Airport in April is currently the most expensive (average of $337). 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.

Related info for your journey

What airport do you fly from for flights from Waterloo to Washington, D.C. Dulles Intl?
If you book a flight to Washington, D.C. Dulles Intl from Waterloo, you will be flying from Waterloo, which is the city’s only airport. Waterloo (ALO) is located 5.3 mi from the center of Waterloo. There are 0 flights from Waterloo to Washington, D.C. Dulles Intl per day from 0 different airlines.
How long is the flight from Waterloo, Iowa to Washington, D.C. Dulles Intl Airport?
A quick flight from Waterloo, Iowa to Washington, D.C. Dulles Intl Airport can take about 8h 04m. American Airlines provides one of the quickest options available for as low as $529. The distance between Waterloo, Iowa and Washington, D.C. Dulles Intl Airport is about 819 mi.
Can I find deals for flights from Waterloo to Dulles Intl that include hotel bookings?
Yes. In addition to deals on Waterloo to Dulles Intl flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Waterloo to Dulles Intl?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Waterloo to Dulles Intl.
Can I find deals for business class flights from Waterloo to Dulles Intl?
Yes. Cheapflights offers flight deals from Waterloo 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.
What is the cheapest month to book a flight from Waterloo, Iowa to Washington, D.C. Dulles Intl Airport?
Currently, July is the cheapest month in which you can book a flight from Waterloo, Iowa to Washington, D.C. Dulles Intl Airport (average of $303). Flying from Waterloo, Iowa to Washington, D.C. Dulles Intl Airport in April is currently the most expensive (average of $337). 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.

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$516+ Cheap flights from Waterloo, IA (ALO) 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 9/1. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Waterloo to Dulles Intl with Cheapflights

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Cheapest flights from Waterloo to Dulles IntlExplore the most affordable flight options available from Waterloo to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 20, 2025.

Explore the most affordable flight options available from Waterloo to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 20, 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from Waterloo to Washington, D.C. Dulles Intl Airport that are best for you.

Best time to book a flight from Waterloo to Dulles Intl

Have a flexible travel schedule? Discover the best time to fly to Dulles Intl from Waterloo with our price prediction graph.

Cheapflights Insights

Everything you need to know about your flight from Waterloo to Washington, D.C. Dulles Intl Airport

What is the cheapest month to book a flight from Waterloo, Iowa to Washington, D.C. Dulles Intl Airport?

Related info for your journey

Find useful and relevant information for your journey from Waterloo 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 Waterloo to Washington, D.C. Dulles Intl?

How long is the flight from Waterloo, Iowa to Washington, D.C. Dulles Intl Airport?

Can I find deals for flights from Waterloo to Dulles Intl that include hotel bookings?

How can I find direct flights from Waterloo to Dulles Intl?

Can I find deals for business class flights from Waterloo to Dulles Intl?

What is the cheapest month to book a flight from Waterloo, Iowa to Washington, D.C. Dulles Intl Airport?

Traveling to a place near Washington, D.C. Dulles Intl Airport?

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Cheapest flights from Waterloo to Dulles Intl
Explore the most affordable flight options available from Waterloo to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 20, 2025.