$114 Cheap United flights Seattle (SEA) to Harrisburg (MDT)

View $114 flight on Sat, Aug 30, 2025Opens in a new window

  • Plan, book, fly with confidence

  • trending down icon
    Be in the know
    Get alerts if flight prices drop or rise*
  • bex rewards loyalty icon
    Book smarter
    Save up to 30% on select hotels after you book a flight*
  • one key icon
    Earn twice
    Earn your airline miles on top of our OneKeyCash
    Learn about One Key

$114 Cheap United flights Seattle (SEA) to Harrisburg (MDT)

Prices were available within the past 7 days and start at $114 for one-way flights and $260 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Sat, Aug 30 - Thu, Sep 11
SEA
Seattle
MDT
Harrisburg
$260 Roundtrip, found 4 hours ago
$260
Roundtrip
found 4 hours ago
Select United flight, departing Sat, Aug 30 from Seattle to Harrisburg, returning Thu, Sep 11, priced at $260 found 4 hours ago
United
Tue, Aug 26 - Sun, Aug 31
SEA
Seattle
MDT
Harrisburg
$262 Roundtrip, found 4 days ago
$262
Roundtrip
found 4 days ago
Select United flight, departing Tue, Aug 26 from Seattle to Harrisburg, returning Sun, Aug 31, priced at $262 found 4 days ago
United
Sat, Aug 30 - Thu, Sep 11
SEA
Seattle
MDT
Harrisburg
$265 Roundtrip, found 4 hours ago
$265
Roundtrip
found 4 hours ago
Select United flight, departing Sat, Aug 30 from Seattle to Harrisburg, returning Thu, Sep 11, priced at $265 found 4 hours ago
United
Tue, Aug 26 - Sun, Aug 31
SEA
Seattle
MDT
Harrisburg
$279 Roundtrip, found 4 days ago
$279
Roundtrip
found 4 days ago
Select United flight, departing Tue, Aug 26 from Seattle to Harrisburg, returning Sun, Aug 31, priced at $279 found 4 days ago
United
Tue, Aug 26 - Sun, Aug 31
SEA
Seattle
MDT
Harrisburg
$285 Roundtrip, found 4 days ago
$285
Roundtrip
found 4 days ago
Select United flight, departing Tue, Aug 26 from Seattle to Harrisburg, returning Sun, Aug 31, priced at $285 found 4 days ago
United
Tue, Aug 26 - Sun, Aug 31
SEA
Seattle
MDT
Harrisburg
$288 Roundtrip, found 4 days ago
$288
Roundtrip
found 4 days ago
Select United flight, departing Tue, Aug 26 from Seattle to Harrisburg, returning Sun, Aug 31, priced at $288 found 4 days ago
Flights from Seattle (SEA) to Harrisburg (MDT)
Origin airport
Seattle - Tacoma Intl.
Destination airport
Harrisburg Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, United
Popular airline
Alaska Airlines
Distance
2290 mi

Frequently asked questions

How much is a United Airlines flight from Seattle - Tacoma Intl. Airport (SEA) to Harrisburg Intl. Airport (MDT)?
Finding cheap one-way United Airlines flights from SEA to MDT from $114 on Expedia couldn't be easier --- just filter by "Price (lowest to highest)." Or check out our budget-friendly return fares from $260 for your next 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 SEA to MDT with United Airlines?
United Airlines flights to Harrisburg are generally more affordable in the quieter months of January and December. Whether you need a one-way or a return ticket, you could find a better deal then.
What is the cheapest time to book flights from Seattle - Tacoma Intl. Airport (SEA) to Harrisburg Intl. Airport (MDT) with United Airlines?
Begin your search one to three months ahead of your departure date to get cheap fares on United Airlines flights from Seattle - Tacoma Intl. Airport (SEA) to Harrisburg Intl. Airport (MDT). You can save 25% by booking your domestic flight 34 to 86 days in advance versus last-minute reservations made 6 to 12 days out. You could also cut costs by buying your fare on a Sunday, as it's 6% cheaper on average than a Monday, the most expensive day to book.* Nail your timing, and you can enjoy significant savings on domestic flights.*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 United Airlines fly nonstop from Seattle - Tacoma Intl. Airport (SEA) to Harrisburg Intl. Airport (MDT)?
Use the "Nonstop" filter when browsing for direct United Airlines flights from SEA to MDT. It's also a great way to compare other airlines servicing the same nonstop trip.
What is the earliest United Airlines flight from SEA to MDT?
Browse United Airlines's earliest flights from SEA to MDT by selecting the "Early Morning" and "Morning" filters. Not only will you get to where you're going sooner, early departures also experience 20% fewer 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 United Airlines fly into in Harrisburg?
Harrisburg Intl. Airport (MDT) is the main Harrisburg gateway for United Airlines flights from Seattle - Tacoma Intl. Airport (SEA).
Why fly with United Airlines from SEA to MDT?
Offering a rewarding loyalty program, United Airlines is a top choice for many travelers departing from SEA to MDT. Plus, if you're a United Mileage Plus and One Key™ member booking through Expedia, you can earn OneKeyCash™* on eligible flights on top of your airline miles.*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 United Airlines flight from Seattle - Tacoma Intl. Airport (SEA) to Harrisburg Intl. Airport (MDT)?
Typically, you can cancel or reschedule your flight, although additional charges may apply if your booking was made more than 24 hours ago. Need flexible options? Make use of our "No cancel fee" and "Changes included" filters to find flights that won't charge extra if you need to revise your plans. To modify your booking, visit "Trips," select your flight and click on "Manage Booking" for more information.

Explore a world of travel with Expedia

*Available to One Key members.