ALO - SEA

$510 Find Cheap Flights from Waterloo to Seattle

This is the cheapest round-trip flight price found by a KAYAK user in the last 72 hours by searching for a flight from Waterloo to Seattle departing on 6/29. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to Seattle

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Waterloo to Seattle, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Waterloo to Seattle, as well as popular online travel agencies
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41,299,237 searches in the past 7 days on KAYAK

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Everything you should know

Cheapest round-trip
$510
American Airlines
Mon 6/29Tue 7/7
ALO - SEA • 1 stop
Nonstop flights
Not available
There are currently no direct flights between Waterloo and Seattle. You'll need at least 1 connection.
Insights
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Insights
Top layover airports
Denver (DEN)
Cheapest • Avg $380 (round-trip)
Denver (DEN)
Shortest trip • 6h 26m (one-way)
Insights
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We hope you love your trip to Seattle!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Waterloo to Seattle (ALO-SEA)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Waterloo to Seattle that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Waterloo to Seattle

Mon, Jun 29 - Tue, Jul 7
American Airlines Logo
3:00 pm - 8:39 pm
ALO
-
SEA
7h 39m
1 stop
American Airlines Logo
3:28 pm - 12:29 am
SEA
-
ALO
7h 01m
1 stop
$510American Airlines
Mon, Jun 29 - Tue, Jul 7
American Airlines Logo
3:00 pm - 8:39 pm
ALO
-
SEA
7h 39m
1 stop
American Airlines Logo
10:22 am - 12:29 am
SEA
-
ALO
12h 07m
2 stops
$520American Airlines
Thu, Aug 20 - Thu, Aug 27
American Airlines Logo
3:19 pm - 11:21 pm
ALO
-
SEA
10h 02m
1 stop
American Airlines Logo
3:28 pm - 12:20 am
SEA
-
ALO
6h 52m
1 stop
$542American Airlines
Wed, Jul 22 - Wed, Jul 29
American Airlines Logo
5:06 am - 12:52 am
ALO
-
SEA
21h 46m
1 stop
American Airlines Logo
6:00 am - 12:29 am
SEA
-
ALO
16h 29m
1 stop
$547American Airlines
Thu, Aug 20 - Thu, Aug 27
American Airlines Logo
3:19 pm - 12:36 am
ALO
-
SEA
11h 17m
2 stops
American Airlines Logo
3:28 pm - 12:20 am
SEA
-
ALO
6h 52m
1 stop
$552American Airlines
Wed, Jul 22 - Tue, Jul 28
American Airlines Logo
5:06 am - 4:47 pm
ALO
-
SEA
13h 41m
2 stops
American Airlines Logo
11:56 pm - 2:53 pm
SEA
-
ALO
12h 57m
1 stop
$557American Airlines
Thu, Aug 20 - Thu, Aug 27
American Airlines Logo
5:00 am - 2:28 pm
ALO
-
SEA
11h 28m
2 stops
American Airlines Logo
10:59 am - 12:20 am
SEA
-
ALO
11h 21m
2 stops
$558American Airlines
Tue, May 19 - Sat, May 23
American Airlines Logo
5:40 am - 12:29 pm
ALO
-
SEA
8h 49m
1 stop
American Airlines Logo
3:06 pm - 12:09 am
SEA
-
ALO
7h 03m
1 stop
$564American Airlines
Thu, Jun 25 - Mon, Jun 29
American Airlines Logo
3:00 pm - 12:41 am
ALO
-
SEA
11h 41m
1 stop
American Airlines Logo
6:00 am - 12:21 am
SEA
-
ALO
16h 21m
1 stop
$568American Airlines
Tue, May 19 - Sat, May 23
American Airlines Logo
5:40 am - 12:29 pm
ALO
-
SEA
8h 49m
1 stop
American Airlines Logo
10:50 am - 12:09 am
SEA
-
ALO
11h 19m
2 stops
$574American Airlines
Booking Insights

KAYAK's insights & trends for Waterloo to Seattle flights

Get data-powered insights and trends into flights from Waterloo to Seattle to help you find the cheapest flights, the best time to fly and much more.

What is the most popular layover airport when flying from Waterloo to Seattle?

Percentage of 1-stop round-trip flights from Waterloo to Seattle chosen by KAYAK users via each layover airport in the last 12 months (only includes trips with the same layover airport on both legs).

Chicago (ORD) is the top choice – 94% of KAYAK users who clicked on 1-stop flights from Waterloo to Seattle picked an itinerary connecting there.

What is the cheapest layover airport when flying from Waterloo to Seattle?

Average round-trip price for 1-stop flights from Waterloo to Seattle clicked by KAYAK users in the last 12 months (only includes trips with the same layover airport on both legs).

Flights via Denver (DEN) offer the most affordable fares, with an average round-trip price of $380.

Which layover airport offers the shortest total travel time from Waterloo to Seattle?

Shortest average total travel time for 1-stop one-way flights from Waterloo to Seattle via different layover airports, based on KAYAK user data from the last 12 months.

Consider flying via Denver (DEN) for the shortest journey. The average one-way travel time for flights connecting there is 6h 26m.

Which layover airport has the quickest connection when flying from Waterloo to Seattle?

Average layover duration at different layover airports for 1-stop one-way flights from Waterloo to Seattle, based on KAYAK user data from the last 12 months.

If you prefer a quick connection, Chicago (ORD) often has the shortest layovers from Waterloo to Seattle, with an average of 2h 00m.

Find deals

Good to know

Cheapest flight$510
Flight from Waterloo to Seattle

When to book flights from Waterloo to Seattle

Are your dates flexible? Find out the best times to travel from Waterloo to Seattle based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Waterloo to Seattle

  • What is the cheapest flight from Waterloo to Seattle?

    In the last 3 days, the lowest price for a flight from Waterloo to Seattle was $510 for a round-trip ticket.

  • Do I need a passport to fly between Waterloo and Seattle?

    No, a passport isn't needed to fly from Waterloo to Seattle. However, local authorities might ask for an official ID.

  • Which airports will I be using when flying from Waterloo to Seattle?

    Waterloo and Seattle are both served by 1 main airport. You will leave Waterloo from Waterloo and will be arriving at Seattle/Tacoma Intl.

  • Which aircraft models fly most regularly from Waterloo to Seattle?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from Waterloo to Seattle?

    oneworld is the only airline alliance operating flights between Waterloo and Seattle.

  • How does KAYAK find such low prices on flights from Waterloo to Seattle?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Waterloo to Seattle.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Waterloo to Seattle?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Seattle from Waterloo is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Waterloo to Seattle?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Seattle with an airline and back to Waterloo with another airline. Booking your flights between Waterloo and SEA can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Waterloo to Seattle?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Seattle from Waterloo up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top airline flying from Waterloo to Seattle

 
See real verified KAYAK customer reviews for airlines flying from Waterloo to Seattle. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Waterloo to Seattle? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.1
American AirlinesOverall score based on 11666 reviews
7.2Comfort
6.9Entertainment
7.9Crew
6.4Food
7.5Boarding
Airline reviews

not sure why you ask about food, I n3ver get food on flights except maybe cookies or pretzels. wifi was slow and in and out most of the flight not good.

8.0 ExcellentConnie, May 2026
PHX - MKE
Read more American Airlines reviews

not sure why you ask about food, I n3ver get food on flights except maybe cookies or pretzels. wifi was slow and in and out most of the flight not good.

Cancelled BOYH legs of our flight home 30 min before initial boarding

Cancelled the flight half hour before boarding. Then cancelled the connecting flight too.

Left early arrived early..right amount of talking from pilots..of course had to love the biscuit and water!

I would like a refund for the extra cost the seat I paid for. An oversized person sat next to me and I couldn’t fit on my seat and had to move to another seat.

Boarding gate at LAX was too crowded—two gates next to one another

The flight was delayed about an hour for a maintenance specialist to approve the maintenance repair

This flight was delayed but it worked in my favor because my Atlanta to Dallas flight was delayed.

This was a hard flight. 3 delays out of OKC (1 on the Tarmac). Delay in Atlanta coming to Dallas. total travel time was the equivalent of driving from OKC to Atlanta.

Like: flights are on time, good boarding process Can improve: planes are old, improve entertainment and make space more comfortable

Everything you need to know for your flight from Waterloo to Seattle

Information on your arrival and departure airports

Waterloo (ALO)
Seattle (SEA)