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 67% 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 December 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

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One-way

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Cheap round-trip flights

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3:08 pm - 10:37 pm

DLH

SEA

9h 29m1 stop

8:45 am - 10:01 pm

SEA

DLH

11h 16m2 stops

$424United Airlines

mer., avr. 22 - sam., avr. 25

7:45 am - 6:35 pm

DLH

SEA

12h 50m2 stops

8:45 am - 10:01 pm

SEA

DLH

11h 16m2 stops

$429United Airlines

mer., avr. 22 - sam., avr. 25

3:08 pm - 10:37 pm

DLH

SEA

9h 29m1 stop

11:59 pm - 10:01 pm

SEA

DLH

20h 02m1 stop

$447United Airlines

mer., avr. 22 - sam., avr. 25

3:08 pm - 10:37 pm

DLH

SEA

9h 29m1 stop

11:59 pm - 10:01 pm

SEA

DLH

20h 02m1 stop

$463United Airlines

mer., avr. 22 - sam., avr. 25

4:24 pm - 8:52 am

DLH

SEA

18h 28m2 stops

6:05 am - 3:44 pm

SEA

DLH

7h 39m1 stop

$466Delta

mar., janv. 6 - mar., janv. 13

11:56 am - 11:22 pm

DLH

SEA

13h 26m2 stops

6:05 am - 3:44 pm

SEA

DLH

7h 39m1 stop

$486Delta

lun., janv. 5 - mar., janv. 13

7:45 am - 11:27 pm

DLH

SEA

17h 42m3 stops

8:45 am - 10:01 pm

SEA

DLH

11h 16m2 stops

$494United Airlines

mer., avr. 22 - sam., avr. 25

4:24 pm - 4:45 pm

DLH

SEA

26h 21m1 stop

6:05 am - 3:44 pm

SEA

DLH

7h 39m1 stop

$521Delta

mer., janv. 7 - mar., janv. 13

11:56 am - 8:46 pm

DLH

SEA

10h 50m1 stop

6:05 am - 3:44 pm

SEA

DLH

7h 39m1 stop

$541Delta

mar., janv. 6 - mar., janv. 13

3:05 pm - 4:29 pm

DLH

SEA

27h 24m2 stops

11:45 pm - 2:30 pm

SEA

DLH

12h 45m2 stops

$546United Airlines

mer., janv. 7 - mar., janv. 13

Delta flights from Duluth to Seattle

Our best Delta deals on Duluth to Seattle flight tickets

Delta

Jan 6

DLH4:24 pmDuluth Intl

18h 28m

2 stops

SEA8:52 amSeattle/Tacoma Intl

Jan 13

SEA6:05 amSeattle/Tacoma Intl

7h 39m

1 stop

DLH3:44 pmDuluth Intl

$466

Find similar

Delta

Jan 5

DLH11:56 amDuluth Intl

13h 26m

2 stops

SEA11:22 pmSeattle/Tacoma Intl

Jan 13

SEA6:05 amSeattle/Tacoma Intl

7h 39m

1 stop

DLH3:44 pmDuluth Intl

$486

Find similar

Delta

Jan 7

DLH4:24 pmDuluth Intl

26h 21m

1 stop

SEA4:45 pmSeattle/Tacoma Intl

Jan 13

SEA6:05 amSeattle/Tacoma Intl

7h 39m

1 stop

DLH3:44 pmDuluth Intl

$521

Find similar

United Airlines flights from Duluth to Seattle

Our best United Airlines deals on Duluth to Seattle flight tickets

United Airlines

Apr 22

DLH3:08 pmDuluth Intl

9h 29m

1 stop

SEA10:37 pmSeattle/Tacoma Intl

Apr 25

SEA8:45 amSeattle/Tacoma Intl

11h 16m

2 stops

DLH10:01 pmDuluth Intl

$424

Find similar

United Airlines

Apr 22

DLH7:45 amDuluth Intl

12h 50m

2 stops

SEA6:35 pmSeattle/Tacoma Intl

Apr 25

SEA8:45 amSeattle/Tacoma Intl

11h 16m

2 stops

DLH10:01 pmDuluth Intl

$429

Find similar

United Airlines

Apr 22

DLH3:08 pmDuluth Intl

9h 29m

1 stop

SEA10:37 pmSeattle/Tacoma Intl

Apr 25

SEA11:59 pmSeattle/Tacoma Intl

20h 02m

1 stop

DLH10:01 pmDuluth Intl

$447

Find similar

Fly from

Fly to

Route

Depart

Return

Price

DuluthSeattle

DLH - SEA

DLHSEA

Duluth Intl

mer. 4/22

3:08 pm-10:37 pm

1 stop9h 29m

Seattle/Tacoma Intl

sam. 4/25

8:45 am-10:01 pm

2 stops11h 16m

$424

DuluthSeattle

DLH - SEA

DLHSEA

Duluth Intl

mer. 4/22

7:45 am-6:35 pm

2 stops12h 50m

Seattle/Tacoma Intl

sam. 4/25

8:45 am-10:01 pm

2 stops11h 16m

$429

DuluthSeattle

DLH - SEA

DLHSEA

Duluth Intl

mer. 4/22

3:08 pm-10:37 pm

1 stop9h 29m

Seattle/Tacoma Intl

sam. 4/25

11:59 pm-10:01 pm

1 stop20h 02m

$447

DuluthSeattle

DLH - SEA

DLHSEA

Duluth Intl

mer. 4/22

3:08 pm-10:37 pm

1 stop9h 29m

Seattle/Tacoma Intl

sam. 4/25

11:59 pm-10:01 pm

1 stop20h 02m

$463

DuluthSeattle

DLH - SEA

DLHSEA

Duluth Intl

mar. 1/6

4:24 pm-8:52 am

2 stops18h 28m

Seattle/Tacoma Intl

mar. 1/13

6:05 am-3:44 pm

1 stop7h 39m

$466

DuluthSeattle

DLH - SEA

DLHSEA

Duluth Intl

lun. 1/5

11:56 am-11:22 pm

2 stops13h 26m

Seattle/Tacoma Intl

mar. 1/13

6:05 am-3:44 pm

1 stop7h 39m

$486

DuluthSeattle

DLH - SEA

DLHSEA

Duluth Intl

mer. 4/22

7:45 am-11:27 pm

3 stops17h 42m

Seattle/Tacoma Intl

sam. 4/25

8:45 am-10:01 pm

2 stops11h 16m

$494

DuluthSeattle

DLH - SEA

DLHSEA

Duluth Intl

mer. 1/7

4:24 pm-4:45 pm

1 stop26h 21m

Seattle/Tacoma Intl

mar. 1/13

6:05 am-3:44 pm

1 stop7h 39m

$521

DuluthSeattle

DLH - SEA

DLHSEA

Duluth Intl

mar. 1/6

11:56 am-8:46 pm

1 stop10h 50m

Seattle/Tacoma Intl

mar. 1/13

6:05 am-3:44 pm

1 stop7h 39m

$541

DuluthSeattle

DLH - SEA

DLHSEA

Duluth Intl

mer. 1/7

3:05 pm-4:29 pm

2 stops27h 24m

Seattle/Tacoma Intl

mar. 1/13

11:45 pm-2:30 pm

2 stops12h 45m

$546

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 13 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 December to fly from Duluth, when ticket prices are also cheap, with an average price of $273.

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

Fastest flight time	6h 22m
Direct flights	None

The fastest flight from Duluth to Seattle takes 6h 22m

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 6h 22m, 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 December 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 67% of the total bookings. Other popular airlines include United Airlines with 17% and Sun Country Air with 16%.

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 9,107 reviews	Search United Airlines flights
Delta	PriceFrom $258	Free Cancellation	Rating 7.9 8,015 reviews	Search Delta flights

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Renton

Olympia

Lynnwood

Kent

Marysville

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Redmond

Tukwila

Cle Elum

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Lakewood

Fife

Centralia

Westport

Kirkland

Shoreline

Why use momondo?

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.