$141 Cheap Frontier Airlines flights Milwaukee (MKE) to Seattle (SEA)

View $141 flight on Fri, Oct 10, 2025Opens in a new window

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$141 Cheap Frontier Airlines flights Milwaukee (MKE) to Seattle (SEA)

Prices were available within the past 7 days and start at $141 for one-way flights and $225 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frontier Airlines
Fri, Sep 26 - Tue, Sep 30
MKE
Milwaukee
SEA
Seattle
$225 Roundtrip, found 8 hours ago
$225
Roundtrip
found 8 hours ago
Select Frontier Airlines flight, departing Fri, Sep 26 from Milwaukee to Seattle, returning Tue, Sep 30, priced at $225 found 8 hours ago
Frontier Airlines
Fri, Aug 15 - Wed, Aug 20
MKE
Milwaukee
SEA
Seattle
$226 Roundtrip, found 12 hours ago
$226
Roundtrip
found 12 hours ago
Select Frontier Airlines flight, departing Fri, Aug 15 from Milwaukee to Seattle, returning Wed, Aug 20, priced at $226 found 12 hours ago
Frontier Airlines
Mon, Aug 18 - Sat, Aug 23
MKE
Milwaukee
SEA
Seattle
$230 Roundtrip, found 12 hours ago
$230
Roundtrip
found 12 hours ago
Select Frontier Airlines flight, departing Mon, Aug 18 from Milwaukee to Seattle, returning Sat, Aug 23, priced at $230 found 12 hours ago
Frontier Airlines
Fri, Sep 5 - Fri, Sep 12
MKE
Milwaukee
SEA
Seattle
$326 Roundtrip, just found
$326
Roundtrip
just found
Select Frontier Airlines flight, departing Fri, Sep 5 from Milwaukee to Seattle, returning Fri, Sep 12, priced at $326 just found
Flights from Milwaukee (MKE) to Seattle (SEA)
Origin airport
General Mitchell Intl.
Destination airport
Seattle - Tacoma Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Frontier Airlines, Hawaiian Airlines, JetBlue Airways, Southwest Airlines, Sun Country Airlines, United
Popular airline
Alaska Airlines
Distance
1688 mi
Average flight time
2 hours 24 mins

Frequently asked questions

How much is a Frontier Airlines flight from General Mitchell Intl. Airport (MKE) to Seattle - Tacoma Intl. Airport (SEA)?
Scoring cheap one-way Frontier Airlines flights from MKE to SEA from $141 on Expedia couldn't be simpler --- just filter by "Price (lowest to highest)." Or check out our affordable return fares from $225 for your next exciting adventure.**These prices were available on Expedia within the past 7 days, for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.
What is the cheapest month to fly from MKE to SEA with Frontier Airlines?
Look for one-way or return flights to Seattle in January or February. You could find lower fares with Frontier Airlines during these off-peak times.
What is the cheapest time to book flights from General Mitchell Intl. Airport (MKE) to Seattle - Tacoma Intl. Airport (SEA) with Frontier Airlines?
Look for cheap Frontier Airlines flights from General Mitchell Intl. Airport (MKE) to Seattle - Tacoma Intl. Airport (SEA) one to three months before your day of departure. Travelers who book domestic flights 34 to 86 days in advance can save 25% compared to those who book just 6 to 12 days ahead. No matter the fare class and itinerary, the best day of the week to book a domestic flight is generally Sunday and the most expensive day tends to be Monday. Passengers who book on a Sunday can save 6% on average compared to those who book on a Monday.**Ideal booking window recommendation is based on average round-trip ticket prices for January through November for 2024. Best day of the week to book recommendation is based on average round-trip ticket prices for January through October 2024. All data sourced from ARC's global airline sales database.
Does Frontier Airlines fly nonstop from General Mitchell Intl. Airport (MKE) to Seattle - Tacoma Intl. Airport (SEA)?
Fill in your dates, click search and select "Nonstop" on Expedia to find any direct flights from MKE to SEA with Frontier Airlines or other carriers.
What is the earliest Frontier Airlines flight from MKE to SEA?
Sort your results by "Early Morning" and "Morning" to browse the earliest flights from MKE to SEA. Taking off early means you're 20% less likely to experience cancellations.**Most reliable time of the day recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
What airports does Frontier Airlines fly into in Seattle?
Frontier Airlines flights from General Mitchell Intl. Airport (MKE) to Seattle touch down at Seattle - Tacoma Intl. Airport (SEA). This is the main gateway to this city.
Why fly with Frontier Airlines from MKE to SEA?
A rewarding loyalty program and the opportunity to collect points through Frontier Miles are the start of the reasons to fly from MKE to SEA with Frontier Airlines. Plus, when you join Expedia's free One Key™ program, you can earn OneKeyCash™* alongside Frontier Airlines's loyalty program earnings. It's yours to spend on your next adventure.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.
Can I change or cancel my Frontier Airlines flight from General Mitchell Intl. Airport (MKE) to Seattle - Tacoma Intl. Airport (SEA)?
Depending on the type of ticket you purchased, a fee will generally apply if you cancel or change your booking more than 24 hours after it's been confirmed. To find flexible fares, select our "Changes included" or "No cancel fee" filter when searching for flights. To learn more about modifying or canceling your reservation, head to "Trips," select your flight and click on "Manage Booking."

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