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$318+ Cheap flights from Duluth to Seattle (DLH - 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 8/25. Fares are subject to change and may not be available on all flights or dates of travel.
DLH — SEA
Aug 14 — Aug 211
Fri 8/14
Fri 8/21
1 adult, Economy
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Cheap flight deals from Duluth to Seattle

Cheapest flights from Duluth to Seattle
Explore the most affordable flight options available from Duluth to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 15, 2026.

This United Airlines deal was found by Cheapflights users on 7/11. 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 8/267:45 am
DLH
-
SEA
2 stops13h 23m
United Airlines
Tue 9/11:57 pm
SEA
-
DLH
1 stop7h 25m
United Airlines
Deal found 7/11$324
This United Airlines deal was found by Cheapflights users on 7/12. 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 10/313:14 pm
DLH
-
SEA
1 stop9h 39m
United Airlines
Wed 11/42:30 pm
SEA
-
DLH
1 stop6h 34m
United Airlines
Deal found 7/12$408
This United Airlines deal was found by Cheapflights users on 7/13. 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.
Tue 9/17:45 am
DLH
-
SEA
2 stops10h 29m
United Airlines
Sat 9/511:00 pm
SEA
-
DLH
1 stop9h 42m
United Airlines
Deal found 7/13$414
This Delta deal was found by Cheapflights users on 7/11. 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.
Fri 11/2012:00 pm
DLH
-
SEA
1 stop6h 35m
Delta
Mon 11/306:05 am
SEA
-
DLH
1 stop7h 39m
Delta
Deal found 7/11$442
This United Airlines deal was found by Cheapflights users on 7/12. 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 9/57:45 am
DLH
-
SEA
2 stops14h 58m
United Airlines
Fri 9/116:52 pm
SEA
-
DLH
2 stops13h 50m
United Airlines
Deal found 7/12$473
This United Airlines deal was found by Cheapflights users on 7/15. 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 9/93:10 pm
DLH
-
SEA
1 stop9h 35m
United Airlines
Mon 9/2111:00 pm
SEA
-
DLH
1 stop9h 42m
United Airlines
Deal found 7/15$507

Find flight deals from Duluth to Seattle

Discover tips and strategies to find the most affordable flight options for your journey from Duluth (DLH) 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 July 15, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$324
(United Airlines)

One-way from

$318
(Delta)
Provider with most accurate pricing for Duluth Intl-Seattle/Tacoma Intl flight deals.
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Provider most trusted by Cheapflights users for Duluth Intl-Seattle/Tacoma Intl flights.
Search Deals
From Duluth Intl to Seattle/Tacoma Intl
Search Deals
One-way flight from Duluth Intl to Seattle/Tacoma Intl
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Cheapflights Fare Finder

 
Customize your flight search to find flights from Duluth 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 July 15, 2026.
Use the filters below to find and compare flights from Duluth to Seattle that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

DuluthSeattle

DLH - SEA

DLHSEA

Duluth Intl

Tue 9/1

7:45 am-4:07 pm

1 stop10h 22m

Seattle/Tacoma Intl

Sat 9/5

11:00 pm-10:42 am

1 stop9h 42m

$408
Quickest round-trip

DuluthSeattle

DLH - SEA

DLHSEA

Duluth Intl

Wed 9/9

3:10 pm-10:45 pm

1 stop9h 35m

Seattle/Tacoma Intl

Mon 9/21

11:00 pm-10:42 am

1 stop9h 42m

$507

DuluthSeattle

DLH - SEA

DLHSEA

Duluth Intl

Wed 9/9

3:10 pm-10:45 pm

1 stop9h 35m

Seattle/Tacoma Intl

Sun 9/20

11:00 pm-10:42 am

1 stop9h 42m

$661

DuluthSeattle

DLH - SEA

DLHSEA

Duluth Intl

Fri 9/18

7:45 am-7:32 pm

2 stops13h 47m

Seattle/Tacoma Intl

Sun 9/27

6:43 pm-10:40 am

2 stops13h 57m

$801
Cheapest one-way

DuluthSeattle

DLH - SEA

DLHSEA

Duluth Intl

Tue 8/25

7:45 am-7:08 pm

2 stops13h 23m

$369

DuluthSeattle

DLH - SEA

DLHSEA

Duluth Intl

Tue 8/4

6:25 pm-7:06 pm

1 stop26h 41m

$449
Quickest one-way

DuluthSeattle

DLH - SEA

DLHSEA

Duluth Intl

Fri 7/24

5:00 am-8:45 am

1 stop5h 45m

$523

DuluthSeattle

DLH - SEA

DLHSEA

Duluth Intl

Fri 7/24

7:03 am-9:59 pm

2 stops16h 56m

$568

DuluthSeattle

DLH - SEA

DLHSEA

Duluth Intl

Mon 7/27

6:25 pm-9:40 am

1 stop17h 15m

$642

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/15

Sorted by cheapest first

Compare providers for flights from Duluth 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 Duluth to Seattle in July.
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 Duluth-Seattle flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Duluth-Seattle flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Duluth-Seattle flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Duluth-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 Duluth-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 Duluth to Seattle

Have a flexible travel schedule? Discover the best time to fly to Seattle from Duluth 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.

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 July 15, 2026.
Read reviews from past customers who have flown Delta and United Airlines from Duluth to Seattle. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
7.8
Good
8,469 reviews

Overall

7.8

Boarding

8.1

Crew

8.5

Food

7.2

Comfort

7.8

Entertainment

7.8

Reviews

1 / 20
8.0
Excellent

Lesley,Aug 2023

LIH - SEA

It was a red eye flight . And after take off and the first service the flight attendants were no where to be found except in the galley. When I went to the bathroom, the entrance was blocked by a FA sitting and he basically exhaled loudly as he had to move his legs so I could get in. Never mind I was a comfort plus passenger and traveled to the back of the plane to go to the bathroom. I know I can go up to first class because there are no rules to prohibit me but it followed the “air” rules and was the flight attendants were rude as if I was putting them out. I will always fly delta but get your crew in check. I’m a former flight attendant and the crew is not priviledged. They are hired and paid to do a service.
Delta
7.8
Good
8,469 reviews
Delta
7.8
Good
8,469 reviews

Overall

7.8

Boarding

8.1

Crew

8.5

Food

7.2

Comfort

7.8

Entertainment

7.8

Reviews

1 / 20
8.0
Excellent

Lesley,Aug 2023

LIH - SEA

It was a red eye flight . And after take off and the first service the flight attendants were no where to be found except in the galley. When I went to the bathroom, the entrance was blocked by a FA sitting and he basically exhaled loudly as he had to move his legs so I could get in. Never mind I was a comfort plus passenger and traveled to the back of the plane to go to the bathroom. I know I can go up to first class because there are no rules to prohibit me but it followed the “air” rules and was the flight attendants were rude as if I was putting them out. I will always fly delta but get your crew in check. I’m a former flight attendant and the crew is not priviledged. They are hired and paid to do a service.
United Airlines
7.4
Good
9,988 reviews
Delta
7.8
Good
8,469 reviews

Overall

7.8

Boarding

8.1

Crew

8.5

Food

7.2

Comfort

7.8

Entertainment

7.8

Reviews

1 / 20
8.0
Excellent

Lesley,Aug 2023

LIH - SEA

It was a red eye flight . And after take off and the first service the flight attendants were no where to be found except in the galley. When I went to the bathroom, the entrance was blocked by a FA sitting and he basically exhaled loudly as he had to move his legs so I could get in. Never mind I was a comfort plus passenger and traveled to the back of the plane to go to the bathroom. I know I can go up to first class because there are no rules to prohibit me but it followed the “air” rules and was the flight attendants were rude as if I was putting them out. I will always fly delta but get your crew in check. I’m a former flight attendant and the crew is not priviledged. They are hired and paid to do a service.

Related info for your journey

Find useful and relevant information for your journey from Duluth 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 Duluth to Seattle?

    A quick flight from Duluth to Seattle can take about 10h 22m. United Airlines provides one of the quickest options available for as low as $408. There are 1406 mi between Duluth and Seattle.

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

    Currently priced at $258, Delta will fly you from Duluth to Seattle and back. In addition to Delta, many other airlines offer competitively priced options for your trip. Check Cheapflights for deals on United Airlines for as low as $258.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Duluth 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.

See more FAQs

Traveling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
SeaTac
Tacoma
Lacey
Leavenworth
Olympia
Ocean Shores
Edmonds
Snoqualmie
Tumwater
Tukwila
Renton
Kent
Lynnwood
Puyallup
Ellensburg
Fife
Marysville
Lakewood
Issaquah
Shoreline

Browse thousands of different options on Cheapflights for your next trip

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Top 2 airlines flying from Duluth to Seattle

Discover the top 2 airlines that operate flights from Duluth 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 July 15, 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$258Average$410FlexibilityNo cancel feeOn-time69%
DeltaCheapest$258Average$423FlexibilityNo cancel feeOn-timeN/A

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