What is the cheapest airline that flies from Duluth Intl to Seattle/Tacoma Intl?

Delta and United Airlines are the most popular carriers operating from Duluth Intl to Seattle/Tacoma Intl

What airlines fly to Seattle?

Delta, United Airlines and Sun Country Air are the top three most popular airlines that fly to Seattle from Duluth according to our data. Delta is the first choice among our users, with 70% of people opting to fly with this airline when traveling to Seattle. Keep in mind that there are 3 different airlines that fly to Seattle on a routine basis, so you have a few additional options to choose from.

When did momondo last update prices for flights from Duluth Intl Airport to Seattle/Tacoma Intl Airport?

Prices for flights from Duluth Intl Airport to Seattle/Tacoma Intl Airport refresh daily.

How many operators does momondo search for flights from Duluth Intl Airport to Seattle/Tacoma Intl Airport?

The number of operators available for flights from Duluth Intl Airport to Seattle/Tacoma Intl Airport is 3 as of November 2025.

How old do you have to be to fly from Duluth Intl Airport to Seattle/Tacoma Intl Airport?

Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Duluth Intl Airport to Seattle/Tacoma Intl Airport.

What documentation or ID do you need to fly to Seattle/Tacoma Intl Airport?

The travel and health documents you'll need for your trip to Seattle/Tacoma Intl Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Seattle/Tacoma Intl Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

$107 Cheap Flights from Duluth to Seattle in 2025/26

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Find the cheapest flights from Duluth to Seattle

Round-trip

One-way

Cheap round-trip flights

Enter your travel dates to find the best prices.

12:15 pm - 2:52 pmDLH-SEA

28h 37m1 stop

6:05 am - 3:37 pmSEA-DLH

7h 32m1 stop

$317Delta

Find Deal

Fri, Feb 27 - Tue, Mar 3

4:24 pm - 8:46 pmDLH-SEA

6h 22m1 stop

6:05 am - 3:44 pmSEA-DLH

7h 39m1 stop

$323Delta

Find Deal

Thu, Feb 5 - Mon, Feb 9

11:55 am - 3:51 pmDLH-SEA

5h 56m1 stop

12:55 am - 10:52 pmSEA-DLH

19h 57m1 stop

$332Delta

Find Deal

Sun, Dec 21 - Tue, Dec 30

11:55 am - 3:51 pmDLH-SEA

5h 56m1 stop

12:55 am - 11:15 amSEA-DLH

8h 20m1 stop

$338Delta

Find Deal

Sun, Dec 21 - Mon, Dec 29

4:24 pm - 8:38 pmDLH-SEA

6h 14m1 stop

11:15 pm - 11:59 pmSEA-DLH

22h 44m2 stops

$358Delta

Find Deal

Sat, Dec 6 - Wed, Dec 10

11:55 am - 3:51 pmDLH-SEA

5h 56m1 stop

12:55 am - 11:15 amSEA-DLH

8h 20m1 stop

$368Delta

Find Deal

Sun, Dec 21 - Sat, Dec 27

12:01 pm - 5:00 pmDLH-SEA

6h 59m1 stop

11:55 pm - 7:35 pmSEA-DLH

17h 40m1 stop

$372Delta

Find Deal

Sat, Dec 6 - Wed, Dec 10

11:55 am - 3:51 pmDLH-SEA

5h 56m1 stop

7:25 am - 10:52 pmSEA-DLH

13h 27m2 stops

$378Delta

Find Deal

Sun, Dec 21 - Wed, Dec 31

4:24 pm - 8:38 pmDLH-SEA

6h 14m1 stop

11:55 pm - 11:59 pmSEA-DLH

22h 04m1 stop

$382Delta

Find Deal

Sat, Dec 6 - Wed, Dec 10

12:15 pm - 8:52 amDLH-SEA

22h 37m2 stops

5:58 pm - 11:33 amSEA-DLH

15h 35m2 stops

$405Delta

Find Deal

Fri, Feb 27 - Tue, Mar 3

Delta flights from Duluth to Seattle

Our best Delta deals on Duluth to Seattle flight tickets

Delta

Feb 27

DLH12:15 pmDuluth Intl

28h 37m

1 stop

SEA2:52 pmSeattle/Tacoma Intl

Mar 3

SEA6:05 amSeattle/Tacoma Intl

7h 32m

1 stop

DLH3:37 pmDuluth Intl

$317

Find similar

Delta

Feb 5

DLH4:24 pmDuluth Intl

6h 22m

1 stop

SEA8:46 pmSeattle/Tacoma Intl

Feb 9

SEA6:05 amSeattle/Tacoma Intl

7h 39m

1 stop

DLH3:44 pmDuluth Intl

$323

Find similar

Delta

Dec 21

DLH11:55 amDuluth Intl

5h 56m

1 stop

SEA3:51 pmSeattle/Tacoma Intl

Dec 31

SEA6:10 pmSeattle/Tacoma Intl

26h 42m

1 stop

DLH10:52 pmDuluth Intl

$332

Find similar

United Airlines flights from Duluth to Seattle

Our best United Airlines deals on Duluth to Seattle flight tickets

United Airlines

Feb 5

DLH3:05 pmDuluth Intl

9h 38m

1 stop

SEA10:43 pmSeattle/Tacoma Intl

Feb 9

SEA8:10 amSeattle/Tacoma Intl

11h 49m

2 stops

DLH9:59 pmDuluth Intl

$543

Find similar

United Airlines

Feb 5

DLH7:40 amDuluth Intl

15h 32m

3 stops

SEA9:12 pmSeattle/Tacoma Intl

Feb 9

SEA7:00 amSeattle/Tacoma Intl

12h 59m

1 stop

DLH9:59 pmDuluth Intl

$597

Find similar

United Airlines

Feb 5

DLH7:40 amDuluth Intl

15h 32m

3 stops

SEA9:12 pmSeattle/Tacoma Intl

Feb 9

SEA8:10 amSeattle/Tacoma Intl

11h 49m

2 stops

DLH9:59 pmDuluth Intl

$604

Find similar

Fly from

Fly to

Route

Depart

Return

Price

DuluthSeattle

DLH - SEA

DLHSEA

Duluth Intl

Fri 2/27

12:15 pm-2:52 pm

1 stop28h 37m

Seattle/Tacoma Intl

Tue 3/3

6:05 am-3:37 pm

1 stop7h 32m

$317

DuluthSeattle

DLH - SEA

DLHSEA

Duluth Intl

Thu 2/5

4:24 pm-8:46 pm

1 stop6h 22m

Seattle/Tacoma Intl

Mon 2/9

6:05 am-3:44 pm

1 stop7h 39m

$323

DuluthSeattle

DLH - SEA

DLHSEA

Duluth Intl

Sun 12/21

11:55 am-3:51 pm

1 stop5h 56m

Seattle/Tacoma Intl

Tue 12/30

12:55 am-10:52 pm

1 stop19h 57m

$332

DuluthSeattle

DLH - SEA

DLHSEA

Duluth Intl

Sun 12/21

11:55 am-3:51 pm

1 stop5h 56m

Seattle/Tacoma Intl

Mon 12/29

12:55 am-11:15 am

1 stop8h 20m

$338

DuluthSeattle

DLH - SEA

DLHSEA

Duluth Intl

Sat 12/6

4:24 pm-8:38 pm

1 stop6h 14m

Seattle/Tacoma Intl

Wed 12/10

11:15 pm-11:59 pm

2 stops22h 44m

$358

DuluthSeattle

DLH - SEA

DLHSEA

Duluth Intl

Sun 12/21

11:55 am-3:51 pm

1 stop5h 56m

Seattle/Tacoma Intl

Sat 12/27

12:55 am-11:15 am

1 stop8h 20m

$368

DuluthSeattle

DLH - SEA

DLHSEA

Duluth Intl

Sat 12/6

12:01 pm-5:00 pm

1 stop6h 59m

Seattle/Tacoma Intl

Wed 12/10

11:55 pm-7:35 pm

1 stop17h 40m

$372

DuluthSeattle

DLH - SEA

DLHSEA

Duluth Intl

Sun 12/21

11:55 am-3:51 pm

1 stop5h 56m

Seattle/Tacoma Intl

Wed 12/31

7:25 am-10:52 pm

2 stops13h 27m

$378

DuluthSeattle

DLH - SEA

DLHSEA

Duluth Intl

Sat 12/6

4:24 pm-8:38 pm

1 stop6h 14m

Seattle/Tacoma Intl

Wed 12/10

11:55 pm-11:59 pm

1 stop22h 04m

$382

DuluthSeattle

DLH - SEA

DLHSEA

Duluth Intl

Fri 2/27

12:15 pm-8:52 am

2 stops22h 37m

Seattle/Tacoma Intl

Tue 3/3

5:58 pm-11:33 am

2 stops15h 35m

$405

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from Duluth to Seattle

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Prices

Airlines

What is the cheapest month to fly to Seattle?

In general, September is the cheapest month to fly from Duluth to Seattle. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $258. If you don’t want to visit Seattle in September, then you should wait until March to fly from Duluth, when ticket prices are also cheap, with an average price of $343.

What is the cheapest day to depart on your flight to Seattle?

On average, the least expensive day to fly to Seattle from Duluth is on a Tuesday. momondo users have found tickets for Tuesday departures for as low as $369. However, this price may fluctuate depending on the airline, the season, and holidays. On the other hand, Saturday is the most expensive day to depart from Duluth because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $571.

What is the cheapest time of day to depart on your flight to Seattle?

Flying to Seattle from Duluth in the afternoon is the least expensive time of day to depart. momondo users have found prices as low as $495 when looking at flights departing in the afternoon. Flights to Seattle are more costly at noon, with an average ticket price of $505. Departure times at noon fall within the peak daily travel times, which is why tickets can be more expensive.

When to book flights from Duluth to Seattle

Are you open to changing your travel dates? Check out the ideal times to fly from Duluth to Seattle according to our flight data. Find out which month and days have the cheapest flights.

Estimated round-trip price

Cheap Duluth to Seattle (DLH to SEA) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Duluth to Seattle

Direct flights	None

There are no direct flights from Duluth to Seattle. There are no popular flight routes from Duluth to Seattle.

Search flight deals

How far is Duluth Intl to Seattle/Tacoma Intl by plane?
The distance between Duluth Intl and Seattle/Tacoma Intl is about 1410.5 mi. Flights usually cover this in 5h 56m, depending on flying conditions and air traffic around both airports.
When did momondo last update prices for flights from Duluth Intl Airport to Seattle/Tacoma Intl Airport?
Prices for flights from Duluth Intl Airport to Seattle/Tacoma Intl Airport refresh daily.
How many operators does momondo search for flights from Duluth Intl Airport to Seattle/Tacoma Intl Airport?
The number of operators available for flights from Duluth Intl Airport to Seattle/Tacoma Intl Airport is 3 as of November 2025.
How old do you have to be to fly from Duluth Intl Airport to Seattle/Tacoma Intl Airport?
Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Duluth Intl Airport to Seattle/Tacoma Intl Airport.
What documentation or ID do you need to fly to Seattle/Tacoma Intl Airport?
The travel and health documents you'll need for your trip to Seattle/Tacoma Intl Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Seattle/Tacoma Intl Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.
What is the most popular airline from Duluth to Seattle?
Based on momondo bookings for flights between Duluth and Seattle, the leading airline is Delta, making up 70% of the total bookings. Other popular airlines include United Airlines with 16% and Sun Country Air with 14%.

Best airlines flying from Duluth to Seattle

Compare and see reviews for airlines that fly from Duluth to Seattle with momondo

Airline	Rating	Free Cancellation	Price
Sun Country Air	PriceFrom $93	Free Cancellation	Rating 6.9 334 reviews	Search Sun Country Air flights
United Airlines	PriceFrom $258	Free Cancellation	Rating 7.4 9,019 reviews	Search United Airlines flights
Delta	PriceFrom $258	Free Cancellation	Rating 7.9 8,002 reviews	Search Delta flights

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Renton

Olympia

Lynnwood

Kent

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Marysville

Redmond

Tukwila

Lakewood

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Fife

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Kirkland

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Shoreline

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Why should I use momondo to find a flight deal from Duluth to Seattle?

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Duluth to Seattle. momondo saves you time and could save you money on your trip.

Can I find flights from Duluth to Seattle with flexible booking policies on momondo?

Yes. momondo allows you to filter the results for Duluth to Seattle flights to just show those with flexible booking policies.

How can momondo help me find flights from Duluth to Seattle?

Once you have performed a search for Duluth to Seattle flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

I’m not ready to book a flight from Duluth to Seattle right now. Can momondo alert me if prices change?

Of course. momondo tracks the price of Duluth to Seattle flights. All you need is a valid email address and we will do the rest; it is that quick and easy.