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$154+ 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 9/2. Fares are subject to change and may not be available on all flights or dates of travel.
MDT — SEA
Apr 21 — Apr 281
Tue 4/21
Tue 4/28
1 adult, Economy
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Cheap 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 March 22, 2026.

This Delta deal was found by Cheapflights users on 3/19. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/25:00 pm
MDT
-
SEA
1 stop8h 46m
Delta
Mon 6/811:05 pm
SEA
-
MDT
1 stop9h 46m
Delta
Deal found 3/19$319
This United Airlines deal was found by Cheapflights users on 3/18. 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.
Sat 4/258:29 am
MDT
-
SEA
2 stops12h 32m
United Airlines
Sat 5/97:00 am
SEA
-
MDT
1 stop6h 53m
United Airlines
Deal found 3/18$324
This United Airlines deal was found by Cheapflights users on 3/21. 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 9/16:30 am
MDT
-
SEA
1 stop7h 47m
United Airlines
Tue 9/110:47 pm
SEA
-
MDT
1 stop7h 44m
United Airlines
Deal found 3/21$338
This United Airlines deal was found by Cheapflights users on 3/18. 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.
Mon 9/215:53 pm
MDT
-
SEA
1 stop7h 49m
United Airlines
Mon 9/2810:10 pm
SEA
-
MDT
1 stop8h 14m
United Airlines
Deal found 3/18$339
This American Airlines deal was found by Cheapflights users on 3/20. 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.
Fri 4/105:38 am
MDT
-
SEA
1 stop7h 36m
American Airlines
Tue 4/1410:47 pm
SEA
-
MDT
1 stop7h 45m
American Airlines
Deal found 3/20$349
This American Airlines deal was found by Cheapflights users on 3/18. 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.
Thu 9/37:40 pm
MDT
-
SEA
1 stop8h 21m
American Airlines
Tue 9/811:55 pm
SEA
-
MDT
1 stop9h 45m
American Airlines
Deal found 3/18$354
This American Airlines deal was found by Cheapflights users on 3/20. 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.
Tue 11/33:46 pm
MDT
-
SEA
1 stop8h 13m
American Airlines
Mon 11/911:20 pm
SEA
-
MDT
1 stop8h 23m
American Airlines
Deal found 3/20$379
This United Airlines deal was found by Cheapflights users on 3/20. 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 4/175:53 pm
MDT
-
SEA
1 stop7h 51m
United Airlines
Fri 4/247:37 pm
SEA
-
MDT
2 stops11h 07m
United Airlines
Deal found 3/20$387
This United Airlines deal was found by Cheapflights users on 3/20. 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 7/295:55 pm
MDT
-
SEA
1 stop9h 19m
United Airlines
Thu 8/611:52 pm
SEA
-
MDT
1 stop6h 44m
United Airlines
Deal found 3/20$388
This American Airlines deal was found by Cheapflights users on 3/17. 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.
Mon 10/265:18 pm
MDT
-
SEA
1 stop8h 33m
American Airlines
Wed 12/910:34 am
SEA
-
MDT
1 stop9h 16m
American Airlines
Deal found 3/17$389
This United Airlines deal was found by Cheapflights users on 3/18. 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.
Sat 7/255:55 pm
MDT
-
SEA
1 stop7h 42m
United Airlines
Tue 8/411:52 pm
SEA
-
MDT
1 stop6h 44m
United Airlines
Deal found 3/18$391

Find 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 March 22, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$319
(American Airlines)

One-way from

$154
(Trip.com)

Popular in

July

Cheapest in

January

Average price

$409
Provider with most accurate pricing for Harrisburg-Seattle/Tacoma Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for Harrisburg-Seattle/Tacoma Intl flights.
Search Deals
From Harrisburg to Seattle/Tacoma Intl
Search Deals
One-way flight from Harrisburg to Seattle/Tacoma Intl
Search Deals
Highest demand for flights based on searches. 10% potential increase in price ($51 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($9 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 2026
Search Deals

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 March 22, 2026.
Use the filters below to find and compare flights from Harrisburg to Seattle that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip
Quickest round-trip

HarrisburgSeattle

MDT - SEA

MDTSEA

Harrisburg

Sat 4/25

2:05 pm-6:46 pm

1 stop7h 41m

Seattle/Tacoma Intl

Tue 4/28

2:39 pm-12:42 am

1 stop7h 03m

$419

HarrisburgSeattle

MDT - SEA

MDTSEA

Harrisburg

Fri 4/10

5:53 pm-12:34 am

1 stop9h 41m

Seattle/Tacoma Intl

Mon 4/13

11:59 pm-1:55 pm

2 stops10h 56m

$424

HarrisburgSeattle

MDT - SEA

MDTSEA

Harrisburg

Thu 7/2

6:30 am-11:38 am

1 stop8h 08m

Seattle/Tacoma Intl

Mon 7/13

10:40 pm-9:44 am

1 stop8h 04m

$427

HarrisburgSeattle

MDT - SEA

MDTSEA

Harrisburg

Tue 8/25

8:30 am-4:15 pm

2 stops10h 45m

Seattle/Tacoma Intl

Mon 8/31

11:10 pm-9:36 am

1 stop7h 26m

$430

HarrisburgSeattle

MDT - SEA

MDTSEA

Harrisburg

Tue 6/2

11:37 am-9:30 pm

2 stops12h 53m

Seattle/Tacoma Intl

Mon 6/8

9:22 pm-10:08 am

1 stop9h 46m

$444

HarrisburgSeattle

MDT - SEA

MDTSEA

Harrisburg

Thu 4/30

10:40 am-10:47 pm

2 stops15h 07m

Seattle/Tacoma Intl

Tue 5/5

10:52 am-11:28 pm

2 stops9h 36m

$509

HarrisburgSeattle

MDT - SEA

MDTSEA

Harrisburg

Fri 4/3

2:41 pm-8:53 pm

1 stop9h 12m

Seattle/Tacoma Intl

Tue 4/7

11:59 pm-10:09 am

1 stop7h 10m

$509
Cheapest one-way

HarrisburgSeattle

MDT - SEA

MDTSEA

Harrisburg

Fri 5/8

5:54 pm-11:59 pm

1 stop9h 05m

$160

HarrisburgSeattle

MDT - SEA

MDTSEA

Harrisburg

Sun 5/24

5:00 pm-10:48 pm

1 stop8h 48m

$180
Quickest one-way

HarrisburgSeattle

MDT - SEA

MDTSEA

Harrisburg

Sat 8/1

5:55 pm-10:37 pm

1 stop7h 42m

$193

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/17

Showing 1-10 of 17 resultsSorted by cheapest first
1
2

Compare providers for flights from Harrisburg to Seattle

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Harrisburg to Seattle in March.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Harrisburg-Seattle flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Harrisburg-Seattle flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Harrisburg-Seattle flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Harrisburg-Seattle flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Harrisburg-Seattle flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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 March 13, 2026.

Booking 90 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, March is the cheapest month in which you can book a flight from Harrisburg to Seattle (average of $156). Flying from Harrisburg to Seattle in August is currently the most expensive (average of $206). 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.

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 March 22, 2026.
Get a feel of what it's like to fly with Alaska Airlines,Delta, andUnited 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
7.9
Good
12,093 reviews

Entertainment

7.0

Food

7.0

Crew

8.5

Comfort

7.8

Boarding

8.1

Overall

7.9

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

SJC - SEA

The flight was great. Don’t have to make it better. Everything was OK.
Alaska Airlines
7.9
Good
12,093 reviews
Alaska Airlines
7.9
Good
12,093 reviews

Entertainment

7.0

Food

7.0

Crew

8.5

Comfort

7.8

Boarding

8.1

Overall

7.9

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

SJC - SEA

The flight was great. Don’t have to make it better. Everything was OK.
Delta
7.9
Good
8,314 reviews
Alaska Airlines
7.9
Good
12,093 reviews

Entertainment

7.0

Food

7.0

Crew

8.5

Comfort

7.8

Boarding

8.1

Overall

7.9

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

SJC - SEA

The flight was great. Don’t have to make it better. Everything was OK.
United Airlines
7.4
Good
9,455 reviews
Alaska Airlines
7.9
Good
12,093 reviews

Entertainment

7.0

Food

7.0

Crew

8.5

Comfort

7.8

Boarding

8.1

Overall

7.9

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

SJC - SEA

The flight was great. Don’t have to make it better. Everything was OK.
American Airlines
7.1
Good
11,487 reviews
Alaska Airlines
7.9
Good
12,093 reviews

Entertainment

7.0

Food

7.0

Crew

8.5

Comfort

7.8

Boarding

8.1

Overall

7.9

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

SJC - SEA

The flight was great. Don’t have to make it better. Everything was OK.

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.

  • How long is the flight from Harrisburg to Seattle?

    A quick flight from Harrisburg to Seattle can take about 7h 41m. United Airlines provides one of the quickest options available for as low as $419. The distance between Harrisburg and Seattle is about 2289 mi.

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

    Delta, at $258, was found to be the cheapest airline from Harrisburg to Seattle.Alternate airlines to your destination round-trip include United Airlines and American Airlines. These flights start at 40% lower than the current average price 3 months from now.

  • What are the cheapest airlines to fly from Harrisburg to Seattle one-way?

    To fly one-way, consider booking your trip with American Airlines, which is currently one of the cheapest options available, starting at $136. Delta flights start at $143 while deals on United Airlines start at $143 one-way.

  • 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, March is the cheapest month in which you can book a flight from Harrisburg to Seattle (average of $156). Flying from Harrisburg to Seattle in August is currently the most expensive (average of $206). 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
Tacoma
Ocean Shores
Olympia
Kent
Lynnwood
Edmonds
Lacey
Renton
Puyallup
Kirkland
Ellensburg
Tukwila
Fife
Lakewood
Aberdeen
Shoreline
Marysville
Centralia
Federal Way

Browse thousands of different options on Cheapflights for your next trip

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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 March 22, 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$258Average$436FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$258Average$443FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$286Average$470FlexibilityNo cancel feeOn-time71%
Alaska AirlinesCheapest$422Average$592FlexibilityNo cancel feeOn-time75%

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