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$114+ Cheap flights from Harrisburg to Seattle (MDT - SEA)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/31. Fares are subject to change and may not be available on all flights or dates of travel.
MDT — SEA
Aug 19 — Aug 261
Tue 8/19
Tue 8/26
1 adult, Economy
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Cheapflights Tip: The best prices from Harrisburg to Seattle/Tacoma Intl are usually found in February or March, booked 48 days in advance, depart on a Wednesday or Thursday and return on a Wednesday

Cheap flight deals from Harrisburg to Seattle

Discover tips and strategies to find the most affordable flight options for your journey from Harrisburg (MDT) to Seattle (SEA). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated August 14, 2025.

Round-trip from

$257
(American Airlines)

One-way from

$114
(American Airlines)

Popular in

October

Cheapest in

February

Average price

$517
From Harrisburg to Seattle/Tacoma Intl
Search Deals
One-way flight from Harrisburg to Seattle/Tacoma Intl
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Highest demand for flights based on searches. 10% potential increase in price ($60 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($13 potential savings vs. average RT price).
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Average for round-trip flights in August 2025
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Find flight deals from Harrisburg to Seattle

Cheapest flights from Harrisburg to Seattle
Explore the most affordable flight options available from Harrisburg to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 14, 2025.

This American Airlines deal was found by Cheapflights users on 8/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/3112:34 pmMDT - SEA
1 stop9h 59mAmerican Airlines
Sat 9/611:05 pmSEA - MDT
1 stop7h 51mAmerican Airlines
Deal found 8/13$257
This American Airlines deal was found by Cheapflights users on 8/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/174:45 pmMDT - SEA
1 stop8h 44mAmerican Airlines
Tue 9/2311:05 pmSEA - MDT
1 stop9h 50mAmerican Airlines
Deal found 8/14$287
This United Airlines deal was found by Cheapflights users on 8/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/306:30 amMDT - SEA
1 stop8h 01mUnited Airlines
Sat 10/47:37 pmSEA - MDT
2 stops10h 52mUnited Airlines
Deal found 8/14$292
This Frontier deal was found by Cheapflights users on 8/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/511:07 amMDT - SEA
2 stops16h 23mFrontier
Sun 9/71:22 pmSEA - MDT
2 stops17h 40mFrontier
Deal found 8/14$302
This United Airlines deal was found by Cheapflights users on 8/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/125:48 pmMDT - SEA
1 stop7h 30mUnited Airlines
Sat 9/2011:54 pmSEA - MDT
1 stop7h 20mUnited Airlines
Deal found 8/14$306
This American Airlines deal was found by Cheapflights users on 8/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/246:30 amMDT - SEA
1 stop8h 30mAmerican Airlines
Mon 9/2911:38 pmSEA - MDT
1 stop7h 35mAmerican Airlines
Deal found 8/13$323
This United Airlines deal was found by Cheapflights users on 8/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/242:24 pmMDT - SEA
1 stop9h 18mUnited Airlines
Mon 9/297:37 pmSEA - MDT
2 stops10h 52mUnited Airlines
Deal found 8/13$334
This United Airlines deal was found by Cheapflights users on 8/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/36:45 amMDT - SEA
1 stop7h 46mUnited Airlines
Sun 9/710:55 pmSEA - MDT
1 stop7h 38mUnited Airlines
Deal found 8/14$347
This Expedia deal was found by Cheapflights users on 8/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/511:07 amMDT - SEA
2 stops16h 23mMultiple Airlines
Sat 9/612:59 amSEA - MDT
1 stop7h 02mMultiple Airlines
Deal found 8/14$362

Cheapflights Fare Finder

 
Customize your flight search to find flights from Harrisburg to Seattle that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated August 14, 2025.
Use the filters below to find and compare flights from Harrisburg to Seattle that are best for you.

Fly from

Harrisburg

Fly to

Seattle

Route

Depart

Return

Price

HarrisburgSeattle

MDT - SEA

MDTSEA

Harrisburg

Sun 8/31

12:34 pm-7:33 pm

1 stop9h 59m

Seattle/Tacoma Intl

Sat 9/6

11:05 pm-9:56 am

1 stop7h 51m

$257

HarrisburgSeattle

MDT - SEA

MDTSEA

Harrisburg

Tue 12/16

5:58 pm-12:14 am

1 stop9h 16m

Seattle/Tacoma Intl

Tue 1/6

6:00 am-5:25 pm

1 stop8h 25m

$287

HarrisburgSeattle

MDT - SEA

MDTSEA

Harrisburg

Wed 9/17

4:45 pm-10:04 pm

1 stop8h 19m

Seattle/Tacoma Intl

Tue 9/23

10:09 am-11:12 pm

1 stop10h 03m

$287

HarrisburgSeattle

MDT - SEA

MDTSEA

Harrisburg

Wed 10/8

6:00 am-11:30 am

1 stop8h 30m

Seattle/Tacoma Intl

Wed 11/19

11:34 am-10:56 pm

1 stop8h 22m

$287

HarrisburgSeattle

MDT - SEA

MDTSEA

Harrisburg

Tue 9/30

6:23 am-12:12 pm

1 stop8h 49m

Seattle/Tacoma Intl

Sat 10/4

7:45 am-6:01 pm

1 stop7h 16m

$287

HarrisburgSeattle

MDT - SEA

MDTSEA

Harrisburg

Tue 9/30

6:30 am-11:31 am

1 stop8h 01m

Seattle/Tacoma Intl

Sat 10/4

7:37 pm-9:29 am

2 stops10h 52m

$292

HarrisburgSeattle

MDT - SEA

MDTSEA

Harrisburg

Fri 9/5

11:07 am-12:30 am

2 stops16h 23m

Seattle/Tacoma Intl

Sun 9/7

1:22 pm-10:02 am

2 stops17h 40m

$302

HarrisburgSeattle

MDT - SEA

MDTSEA

Harrisburg

Fri 9/12

5:48 pm-10:18 pm

1 stop7h 30m

Seattle/Tacoma Intl

Sat 9/20

11:54 pm-10:14 am

1 stop7h 20m

$306

HarrisburgSeattle

MDT - SEA

MDTSEA

Harrisburg

Sun 10/5

6:23 am-2:50 pm

1 stop11h 27m

Seattle/Tacoma Intl

Thu 10/9

11:42 am-11:11 pm

1 stop8h 29m

$323

HarrisburgSeattle

MDT - SEA

MDTSEA

Harrisburg

Fri 10/31

3:07 pm-10:30 pm

1 stop10h 23m

$114

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/13

Showing 1-10 of 18 results
1
2

Best time to book a flight from Harrisburg to Seattle

Have a flexible travel schedule? Discover the best time to fly to Seattle from Harrisburg with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Harrisburg to Seattle

How far ahead should I book a flight from Harrisburg to Seattle?

Use this chart to determine the optimal time to book a round-trip flight from Harrisburg to Seattle. Price data was last updated on August 8, 2025.

Booking 36 days in advance of your planned departure date is, on average, the best time to get cheap flights from Harrisburg to Seattle. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

What is the cheapest month to book a flight from Harrisburg to Seattle?

Currently, January is the cheapest month in which you can book a flight from Harrisburg to Seattle (average of $238). Flying from Harrisburg to Seattle in June is currently the most expensive (average of $389). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

How much does it cost to fly round-trip from Harrisburg to Seattle?

Reviews of airlines servicing Seattle

Get insights into the airlines that provide service to Seattle. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Seattle. Reviews last updated August 14, 2025.
Get a feel of what it's like to fly with Alaska Airlines, Delta, and United Airlines from Harrisburg to Seattle by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Comfort

7.8

Overall

8.0

Entertainment

7.0

Boarding

8.1

Food

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Jul 2025

EUG - SEA

Mobility support was fabulous No flight entertainment that I was aware of.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Comfort

7.8

Overall

8.0

Entertainment

7.0

Boarding

8.1

Food

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Jul 2025

EUG - SEA

Mobility support was fabulous No flight entertainment that I was aware of.
Delta
8.0
Very good
7,980 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Comfort

7.8

Overall

8.0

Entertainment

7.0

Boarding

8.1

Food

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Jul 2025

EUG - SEA

Mobility support was fabulous No flight entertainment that I was aware of.
United Airlines
7.4
Good
8,916 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Comfort

7.8

Overall

8.0

Entertainment

7.0

Boarding

8.1

Food

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Jul 2025

EUG - SEA

Mobility support was fabulous No flight entertainment that I was aware of.
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Comfort

7.8

Overall

8.0

Entertainment

7.0

Boarding

8.1

Food

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Jul 2025

EUG - SEA

Mobility support was fabulous No flight entertainment that I was aware of.

Related info for your journey

Find useful and relevant information for your journey from Harrisburg to Seattle. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What are the cheapest airlines flying from Harrisburg to Seattle round-trip?

    Delta, at $286, was found to be the cheapest airline from Harrisburg to Seattle.Alternate airlines to your destination round-trip include American Airlines and United Airlines. These flights start at 42% lower than the current average price 3 months from now.

  • Can I find deals for flights from Harrisburg to Seattle that include hotel bookings?

    Yes. In addition to deals on Harrisburg to Seattle flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Harrisburg to Seattle?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Harrisburg to Seattle.

  • Can I find deals for business class flights from Harrisburg to Seattle?

    Yes. Cheapflights offers flight deals from Harrisburg to Seattle by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Harrisburg to Seattle?

    Currently, January is the cheapest month in which you can book a flight from Harrisburg to Seattle (average of $238). Flying from Harrisburg to Seattle in June is currently the most expensive (average of $389). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
SeaTac
Tukwila
Tacoma
Ocean Shores
Lakewood
Lynnwood
Lacey
Leavenworth
Renton
Olympia
Puyallup
Kent
Cle Elum
Chehalis
Kirkland
Issaquah
Aberdeen
Shoreline
Federal Way
Shelton

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Alternative routes for Harrisburg to Seattle

See prices for flight routes from nearby airports that may be better suited for you.
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Top 4 airlines flying from Harrisburg to Seattle

Discover the top 4 airlines that operate flights from Harrisburg to Seattle. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated August 14, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$286Average$436FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$309Average$516FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$335Average$506FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$432Average$696FlexibilityNo cancel feeOn-time75%

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