ALO - SEA

$355 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 4/28. 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
Travelers love KAYAK
41,299,237 searches in the past 7 days on KAYAK

Save 23% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

Bundle and saveSave money when you bundle your flight + hotel.

Filter your dealsChoose cabin class, free Wi-Fi and more.

Everything you should know

Cheapest round-trip
$355
American Airlines
Tue 4/28Mon 5/4
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
Insights
Insights
Insights
Top layover airports
Denver (DEN)
Cheapest • Avg $380 (round-trip)
Denver (DEN)
Shortest trip • 6h 26m (one-way)
Insights
Insights
Insights
Insights
Start a new search
KAYAK searches 100s of sites at once to find you the best travel deals.
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

Tue, Apr 28 - Mon, May 4
American Airlines Logo
5:40 am - 12:29 pm
ALO
-
SEA
8h 49m
1 stop
American Airlines Logo
3:17 pm - 11:49 pm
SEA
-
ALO
6h 32m
1 stop
$355American Airlines
Tue, Apr 28 - Mon, May 4
American Airlines Logo
5:40 am - 12:29 pm
ALO
-
SEA
8h 49m
1 stop
American Airlines Logo
11:55 pm - 1:53 pm
SEA
-
ALO
11h 58m
2 stops
$360American Airlines
Tue, Apr 28 - Mon, May 4
American Airlines Logo
2:23 pm - 10:58 pm
ALO
-
SEA
10h 35m
2 stops
American Airlines Logo
11:55 pm - 1:53 pm
SEA
-
ALO
11h 58m
2 stops
$365American Airlines
Wed, Apr 29 - Mon, May 4
American Airlines Logo
2:23 pm - 10:47 pm
ALO
-
SEA
10h 24m
2 stops
American Airlines Logo
11:55 pm - 1:53 pm
SEA
-
ALO
11h 58m
2 stops
$467American Airlines
Thu, Jun 18 - Tue, Jun 23
American Airlines Logo
3:02 pm - 8:33 pm
ALO
-
SEA
7h 31m
1 stop
American Airlines Logo
3:06 pm - 12:09 am
SEA
-
ALO
7h 03m
1 stop
$497American Airlines
Fri, Jul 3 - Sat, Jul 11
American Airlines Logo
3:22 pm - 11:35 pm
ALO
-
SEA
10h 13m
1 stop
American Airlines Logo
10:47 am - 11:59 pm
SEA
-
ALO
11h 12m
2 stops
$509American Airlines
Fri, Jul 31 - Sat, Aug 8
American Airlines Logo
3:22 pm - 8:37 pm
ALO
-
SEA
7h 15m
1 stop
American Airlines Logo
6:10 am - 2:41 pm
SEA
-
ALO
6h 31m
1 stop
$598American Airlines
Thu, Jun 18 - Tue, Jun 23
American Airlines Logo
3:02 pm - 8:33 pm
ALO
-
SEA
7h 31m
1 stop
American Airlines Logo
11:03 am - 12:09 am
SEA
-
ALO
11h 06m
2 stops
$603American Airlines
Mon, Apr 27 - Fri, May 1
American Airlines Logo
2:23 pm - 12:36 am
ALO
-
SEA
12h 13m
1 stop
American Airlines Logo
3:17 pm - 1:53 pm
SEA
-
ALO
20h 36m
1 stop
$630American Airlines
Fri, Jul 17 - Sat, Jul 25
American Airlines Logo
3:22 pm - 8:37 pm
ALO
-
SEA
7h 15m
1 stop
American Airlines Logo
1:45 pm - 11:59 pm
SEA
-
ALO
8h 14m
1 stop
$639American 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 – 93% 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 10m.

Find deals

Good to know

Cheapest flight$355
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 $355 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 11488 reviews
7.2Comfort
6.9Entertainment
6.4Food
7.5Boarding
7.9Crew
Airline reviews

Rough flight No beverage service due to turbulence Bottom Seat cushion was non existent

4.0 OkayRavi, Mar 2026
SJC - DFW
Read more American Airlines reviews

Rough flight No beverage service due to turbulence Bottom Seat cushion was non existent

Great experience. Good dinner and service. FA's were very nice and attentive.

It was great. Smooth flight, comfortable, left on time and landed on time.

We hoarded. Then we deplaned. Then we waited for 10 hours in the MSP airport due to a wheel misfunction. We understand safety but communication between crew and airport staff was horrible. When we did finally board, we were rushed on and because we were waiting for a “fresh” pilot and crew, we sat in a roasting plane with no A/C for an hour. My question is why was this flight not cancelled right away when they knew this would be a huge issue OR, why did AA not get a substitute plane, considering this was already a full flight? To me, this appears to be a complete breakdown in leadership and utter systems failure. The compensation for completely disrupting travel plans for hundreds, which we paid dearly for, was measly. While we appreciated the lodging for the night, $12 in meal vouchers isn’t going to sustain anyone for over 12 hours. “We apologize; our hands are tied” is no longer an acceptable explanation. We are so completely turned off by this experience and will definitely seek alternative avenues when we need to fly.

Mostly good. The WiFi wasn’t working so that was not great.

I rated the experience "mediocre" because of the 2 hour delay in take off. This is the 4th flight from DFW on AA where there was a delay and in one of the instances (after 13 delays), the flight was cancelled. I understand weather but for the March 18th flight, there was no weather issue in Dallas or Detroit. I called Concierge Key and they were wonderful, booking me on a later flight in case my flight was cancelled. I have flown with American for many years and never has there been this consistent pattern of delays. Very disappointing.

They put me on an earlier and I got home sooner

Not good. One of my luggage is missing. And until now they can’t find it

Horrible experience upon landing. Probably more due to DCA utter incompetence than AA.

Jill was the flight attendant in first class she was fabulous!! Best flight attendant I have had in years.!! And I fly every other week. Other can learn from her!!

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

Information on your arrival and departure airports

Waterloo (ALO)
Seattle (SEA)