In terms of precipitation, rainfall in Waterloo, Iowa ranges from 0.8 - 5.0 inches per month. June is typically the wettest month, when rainfall can reach 5.0 in. January is typically the driest time to visit Waterloo, Iowa when rainfall is around 0.8 in.

If weather is an important factor for your trip to Waterloo, Iowa, 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 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 19.4 F).

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

When flying from Washington, D.C. Dulles Intl Airport to Waterloo, Iowa, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

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

If you book a flight to Waterloo from Washington, D.C. Dulles Intl, you will be flying to 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 Washington, D.C. Dulles Intl to Waterloo per day from 0 different airlines.

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

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

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

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

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

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

$481+ Flights from Washington, D.C. Dulles Intl Airport to Waterloo, IA

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Cheap flight deals from Dulles Intl to Waterloo

Round-trip from	$525 (American Airlines)
One-way from	$481 (American Airlines)

From Washington, D.C. Dulles Intl to Waterloo

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One-way flight from Washington, D.C. Dulles Intl to Waterloo

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Find flight deals from Dulles Intl to Waterloo

Cheapest flights from Dulles Intl to Waterloo
Explore the most affordable flight options available from Dulles Intl to Waterloo. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 29, 2025.

Thu 10/25:26 pmIAD - ALO

2 stops7h 15mAmerican Airlines

Mon 10/63:21 pmALO - IAD

2 stops7h 29mAmerican Airlines

Deal found 7/27

$525

Best flights from Dulles Intl to Waterloo
Discover carefully curated flight deals from Dulles Intl to Waterloo that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated July 29, 2025.

Thu 10/25:26 pmIAD - ALO

2 stops7h 15mAmerican Airlines

Mon 10/63:21 pmALO - IAD

2 stops7h 29mAmerican Airlines

Deal found 7/27

$525

Last-minute flights from Dulles Intl to Waterloo
Discover last-minute flight deals from Dulles Intl to Waterloo. Data last updated July 29, 2025 and is based on user searches.

Fri 8/87:44 amIAD - ALO

2 stops16h 53mAmerican Airlines

Sat 8/166:00 amALO - IAD

2 stops12h 49mAmerican Airlines

Deal found 7/26

$730

Mon 8/254:36 pmIAD - ALO

2 stops8h 01mAmerican Airlines

Mon 9/13:14 pmALO - IAD

2 stops7h 38mAmerican Airlines

Deal found 7/27

$542

One-way flights from Dulles Intl to Waterloo
Search for one-way flight options from Dulles Intl to Waterloo. Find affordable one-way fares based on user searches. Data last updated July 29, 2025.

Thu 8/281:18 pmIAD - ALO

2 stops11h 19mAmerican Airlines

Deal found 7/28

$481

Cheapflights Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

Washington, D.C.Waterloo

IAD - ALO

IADALO

Washington, D.C. Dulles Intl

Thu 10/2

5:26 pm-11:41 pm

2 stops7h 15m

Waterloo

Mon 10/6

3:21 pm-11:50 pm

2 stops7h 29m

$525

Washington, D.C.Waterloo

IAD - ALO

IADALO

Washington, D.C. Dulles Intl

Thu 8/28

1:18 pm-11:37 pm

2 stops11h 19m

$481

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/28

Best time to book a flight from Dulles Intl to Waterloo

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

Reviews of airlines servicing Waterloo

Read through reviews of airlines operating flights from Washington, D.C. Dulles Intl Airport to Waterloo, such as American Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

American Airlines

7.2

Good

10,000 reviews

Reviews

1 / 20

2.0

Mediocre

Andrew,May 2025

LAX - MIA

2 hour delay. Discovered an engine problem late, we boarded the plane and they asked us to come off. To add insult to injury nothing was given to passengers to make amends. No free drink. No extra food or snacks. No free WiFi. Gimme a break

American Airlines

7.2

Good

10,000 reviews

American Airlines

7.2

Good

10,000 reviews

Reviews

1 / 20

2.0

Mediocre

Andrew,May 2025

LAX - MIA

Related info for your journey

What airport do you fly into for flights to Waterloo from Washington, D.C. Dulles Intl?
If you book a flight to Waterloo from Washington, D.C. Dulles Intl, you will be flying to 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 Washington, D.C. Dulles Intl to Waterloo per day from 0 different airlines.
Can I find deals for flights from Dulles Intl to Waterloo that include hotel bookings?
Yes. In addition to deals on Dulles Intl to Waterloo flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Dulles Intl to Waterloo?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Dulles Intl to Waterloo.
Can I find deals for business class flights from Dulles Intl to Waterloo?
Yes. Cheapflights offers flight deals from Dulles Intl to Waterloo by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

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$481+ Cheap flights from Dulles Intl (IAD) to Waterloo, IA (ALO)

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 8/28. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Dulles Intl to Waterloo with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheap flight deals from Dulles Intl to Waterloo

Round-trip from

One-way from

Find flight deals from Dulles Intl to Waterloo

Cheapest flights from Dulles Intl to WaterlooExplore the most affordable flight options available from Dulles Intl to Waterloo. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 29, 2025.

Explore the most affordable flight options available from Dulles Intl to Waterloo. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 29, 2025.

Cheapflights Fare Finder

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

Best time to book a flight from Dulles Intl to Waterloo

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

Reviews of airlines servicing Waterloo

Read through reviews of airlines operating flights from Washington, D.C. Dulles Intl Airport to Waterloo, such as American Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

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

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

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

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

Traveling to a place near Waterloo?

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Alternative routes for Dulles Intl to Waterloo

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Travel Smart

Cheapest flights from Dulles Intl to Waterloo
Explore the most affordable flight options available from Dulles Intl to Waterloo. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 29, 2025.