SEA - ALO

$409 Find Cheap Flights from Seattle to Waterloo

This is the cheapest round-trip flight price found by a KAYAK user in the last 72 hours by searching for a flight from Seattle to Waterloo departing on 11/20. 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 Waterloo

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Seattle to Waterloo, 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 Seattle to Waterloo, as well as popular online travel agencies
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Everything you should know

Cheapest round-trip
$409
American Airlines
Thu 11/20Thu 11/27
SEA - ALO • 1 stop
Cheapest one-way
Multiple Airlines
Mon 11/3
SEA - ALO • multi-stop
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We hope you love your trip to Waterloo!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Seattle to Waterloo (SEA-ALO)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Seattle to Waterloo 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 Seattle to Waterloo

Thu, Nov 20 - Thu, Nov 27
American Airlines Logo
2:46 pm - 11:48 pmSEA-ALO
7h 02m1 stop
American Airlines Logo
6:00 am - 3:25 pmALO-SEA
11h 25m2 stops
$409American Airlines
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Tue, Nov 18 - Tue, Nov 25
American Airlines Logo
9:00 am - 7:57 pmSEA-ALO
8h 57m1 stop
American Airlines Logo
3:20 pm - 11:18 pmALO-SEA
9h 58m1 stop
$439American Airlines
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Tue, Nov 18 - Tue, Nov 25
American Airlines Logo
5:24 am - 7:57 pmSEA-ALO
12h 33m2 stops
American Airlines Logo
3:20 pm - 11:18 pmALO-SEA
9h 58m1 stop
$444American Airlines
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Tue, Mar 3 - Sat, Mar 7
American Airlines Logo
1:44 pm - 10:20 pmSEA-ALO
6h 36m1 stop
American Airlines Logo
6:00 am - 3:58 pmALO-SEA
11h 58m2 stops
$478American Airlines
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Tue, Mar 3 - Sat, Mar 7
American Airlines Logo
5:39 am - 10:20 pmSEA-ALO
14h 41m2 stops
American Airlines Logo
6:00 am - 3:58 pmALO-SEA
11h 58m2 stops
$483American Airlines
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Sun, Nov 23 - Thu, Nov 27
American Airlines Logo
2:46 pm - 11:48 pmSEA-ALO
7h 02m1 stop
American Airlines Logo
6:00 am - 3:25 pmALO-SEA
11h 25m2 stops
$494American Airlines
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Wed, Nov 19 - Thu, Nov 27
American Airlines Logo
12:59 am - 2:47 pmSEA-ALO
11h 48m2 stops
American Airlines Logo
6:00 am - 3:25 pmALO-SEA
11h 25m2 stops
$499American Airlines
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Sat, Nov 22 - Wed, Nov 26
American Airlines Logo
2:46 pm - 11:48 pmSEA-ALO
7h 02m1 stop
American Airlines Logo
3:17 pm - 11:18 pmALO-SEA
10h 01m1 stop
$508American Airlines
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Sat, Nov 22 - Wed, Nov 26
American Airlines Logo
11:59 pm - 2:47 pmSEA-ALO
12h 48m2 stops
American Airlines Logo
3:17 pm - 11:18 pmALO-SEA
10h 01m1 stop
$513American Airlines
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Thu, Nov 20 - Thu, Nov 27
American Airlines Logo
2:46 pm - 11:48 pmSEA-ALO
7h 02m1 stop
American Airlines Logo
6:00 am - 1:54 pmALO-SEA
9h 54m1 stop
$524American Airlines
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Booking Insights

KAYAK's insights & trends for Seattle to Waterloo flights

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

What’s the cheapest day of the week to fly from Seattle to Waterloo?

The average price of all round-trip flights from Seattle to Waterloo clicked on KAYAK for each day over the last 12 months.

If you are looking for a flight deal from Seattle to Waterloo, look for departures on Thursdays and avoid leaving on a Friday, as it's usually the priciest day. When flying back from Waterloo, Tuesday is the cheapest day to fly and Saturday is the most expensive.

Find deals

Good to know

Cheapest flight$409
Flight from Seattle to Waterloo

When to book flights from Seattle to Waterloo

Are your dates flexible? Find out the best times to travel from Seattle to Waterloo 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 Seattle to Waterloo

  • What is the cheapest flight from Seattle to Waterloo?

    In the last 3 days, the lowest price for a flight from Seattle to Waterloo was $409 for a round-trip ticket.

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

    No

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

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

  • Which airline alliances offer flights from Seattle to Waterloo?

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

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

    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 Seattle to Waterloo.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Waterloo from Seattle 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 Seattle to Waterloo?

    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 Waterloo with an airline and back to Seattle with another airline. Booking your flights between Seattle and ALO 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 Seattle to Waterloo?

    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 Waterloo from Seattle 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 Seattle to Waterloo

 
See real verified KAYAK customer reviews for airlines flying from Seattle to Waterloo. 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 Seattle to Waterloo? 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.
7.2
American AirlinesOverall score based on 11037 reviews
6.9Entertainment
6.4Food
7.5Boarding
7.2Comfort
8.0Crew
Airline reviews

We loved the steward on the plane. He made the night enjoyable

10.0 Excellentchloe, Nov 2025ORD - ATW
Read more American Airlines reviews

We loved the steward on the plane. He made the night enjoyable

I enjoyed the extra leg room compared to other airlines. The first stewards made my daughter’s birthday special by giving her an extra snack. Then the last one coming home from Chicago to Appleton made our night really enjoyable Thanks for making our trip enjoyable

The flight was smooth, the pilot kept us informed about delays and we arrived more of less on time

Flight delay was communicated before leaving for airport which caused it to be a non-event. Great flight and crew!

Did not get any refreshments. Crew was very nice but limited. Small seats

Wish some foods provided rather than just biscuit/cookie for flight more than 2 hours

Wish a flight with more than 2 hours with some snack rather than just cookie/biscuit.

The flight attendant, a black woman with curly hair who sat near Row 21, was wonderful and kind.

It was good..clean, comfy seat. Friendly warm welcoming crew. Was able to check my cabin luggage at the gate which I was able to pickup in a decent time from baggage claim. The app gave all updates from delays to baggage claim info. Overall smooth flight.

Flight was delayed leaving Dallas. Arrived about 2 hours later than scheduled.

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

Information on your arrival and departure airports

Seattle (SEA)
Waterloo (ALO)

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