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 64% 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 January 2026.

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.

$299 Cheap Flights from Duluth to Seattle in 2026

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Find the cheapest flights from Duluth to Seattle

Round-trip

One-way

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Cheap round-trip flights

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3:19 pm - 10:43 pm

DLH

SEA

9h 24m

1 stop

11:59 pm - 10:43 am

SEA

DLH

8h 44m

1 stop

$299United Airlines

Thu, Feb 12 - Thu, Feb 19

7:40 am - 4:01 pm

DLH

SEA

10h 21m

1 stop

11:59 pm - 10:43 am

SEA

DLH

8h 44m

1 stop

$357United Airlines

Wed, Feb 11 - Wed, Feb 18

4:30 pm - 8:39 pm

DLH

SEA

6h 09m

1 stop

6:00 am - 10:46 pm

SEA

DLH

14h 46m

1 stop

$361Delta

Thu, Apr 23 - Tue, Apr 28

7:45 am - 8:53 pm

DLH

SEA

15h 08m

2 stops

11:59 pm - 10:29 am

SEA

DLH

8h 30m

1 stop

$364United Airlines

Thu, Apr 23 - Tue, Apr 28

7:45 am - 8:53 pm

DLH

SEA

15h 08m

2 stops

7:37 pm - 10:29 am

SEA

DLH

12h 52m

2 stops

$369United Airlines

Thu, Apr 23 - Tue, Apr 28

4:30 pm - 8:39 pm

DLH

SEA

6h 09m

1 stop

11:59 pm - 12:06 pm

SEA

DLH

10h 07m

1 stop

$371Delta

Thu, Apr 23 - Mon, Apr 27

3:19 pm - 10:43 pm

DLH

SEA

9h 24m

1 stop

7:29 pm - 10:43 am

SEA

DLH

13h 14m

2 stops

$384United Airlines

Thu, Feb 12 - Thu, Feb 19

12:46 pm - 11:53 pm

DLH

SEA

13h 07m

1 stop

6:00 am - 8:01 pm

SEA

DLH

12h 01m

1 stop

$385Delta

Fri, Apr 24 - Tue, Apr 28

12:46 pm - 11:53 pm

DLH

SEA

13h 07m

1 stop

11:59 pm - 12:06 pm

SEA

DLH

10h 07m

1 stop

$395Delta

Fri, Apr 24 - Mon, Apr 27

11:19 am - 7:00 pm

DLH

SEA

9h 41m

1 stop

7:37 pm - 10:29 am

SEA

DLH

12h 52m

2 stops

$423United Airlines

Fri, Apr 24 - Tue, Apr 28

Delta flights from Duluth to Seattle

Our best Delta deals on Duluth to Seattle flight tickets

Delta

Apr 23

DLH4:30 pmDuluth Intl

6h 09m

1 stop

SEA8:39 pmSeattle/Tacoma Intl

Apr 28

SEA6:00 amSeattle/Tacoma Intl

14h 46m

1 stop

DLH10:46 pmDuluth Intl

$361

Delta

Apr 23

DLH4:30 pmDuluth Intl

6h 09m

1 stop

SEA8:39 pmSeattle/Tacoma Intl

Apr 27

SEA11:59 pmSeattle/Tacoma Intl

10h 07m

1 stop

DLH12:06 pmDuluth Intl

$371

Delta

Apr 24

DLH12:46 pmDuluth Intl

13h 07m

1 stop

SEA11:53 pmSeattle/Tacoma Intl

Apr 28

SEA6:00 amSeattle/Tacoma Intl

12h 01m

1 stop

DLH8:01 pmDuluth Intl

$385

United Airlines flights from Duluth to Seattle

Our best United Airlines deals on Duluth to Seattle flight tickets

United Airlines

Feb 12

DLH3:19 pmDuluth Intl

9h 24m

1 stop

SEA10:43 pmSeattle/Tacoma Intl

Feb 19

SEA11:59 pmSeattle/Tacoma Intl

8h 44m

1 stop

DLH10:43 amDuluth Intl

$299

United Airlines

Feb 11

DLH7:40 amDuluth Intl

10h 21m

1 stop

SEA4:01 pmSeattle/Tacoma Intl

Feb 18

SEA11:59 pmSeattle/Tacoma Intl

8h 44m

1 stop

DLH10:43 amDuluth Intl

$357

United Airlines

Apr 23

DLH7:45 amDuluth Intl

15h 08m

2 stops

SEA8:53 pmSeattle/Tacoma Intl

Apr 28

SEA11:59 pmSeattle/Tacoma Intl

8h 30m

1 stop

DLH10:29 amDuluth Intl

$364

Fly from

Fly to

Route

Depart

Return

Price

DuluthSeattle

DLH - SEA

DLHSEA

Duluth Intl

Thu 2/12

3:19 pm-10:43 pm

1 stop9h 24m

Seattle/Tacoma Intl

Thu 2/19

11:59 pm-10:43 am

1 stop8h 44m

$299

DuluthSeattle

DLH - SEA

DLHSEA

Duluth Intl

Wed 2/11

7:40 am-4:01 pm

1 stop10h 21m

Seattle/Tacoma Intl

Wed 2/18

11:59 pm-10:43 am

1 stop8h 44m

$357

DuluthSeattle

DLH - SEA

DLHSEA

Duluth Intl

Thu 4/23

4:30 pm-8:39 pm

1 stop6h 09m

Seattle/Tacoma Intl

Tue 4/28

6:00 am-10:46 pm

1 stop14h 46m

$361

DuluthSeattle

DLH - SEA

DLHSEA

Duluth Intl

Thu 4/23

7:45 am-8:53 pm

2 stops15h 08m

Seattle/Tacoma Intl

Tue 4/28

11:59 pm-10:29 am

1 stop8h 30m

$364

DuluthSeattle

DLH - SEA

DLHSEA

Duluth Intl

Thu 4/23

7:45 am-8:53 pm

2 stops15h 08m

Seattle/Tacoma Intl

Tue 4/28

7:37 pm-10:29 am

2 stops12h 52m

$369

DuluthSeattle

DLH - SEA

DLHSEA

Duluth Intl

Thu 4/23

4:30 pm-8:39 pm

1 stop6h 09m

Seattle/Tacoma Intl

Mon 4/27

11:59 pm-12:06 pm

1 stop10h 07m

$371

DuluthSeattle

DLH - SEA

DLHSEA

Duluth Intl

Thu 2/12

3:19 pm-10:43 pm

1 stop9h 24m

Seattle/Tacoma Intl

Thu 2/19

7:29 pm-10:43 am

2 stops13h 14m

$384

DuluthSeattle

DLH - SEA

DLHSEA

Duluth Intl

Fri 4/24

12:46 pm-11:53 pm

1 stop13h 07m

Seattle/Tacoma Intl

Tue 4/28

6:00 am-8:01 pm

1 stop12h 01m

$385

DuluthSeattle

DLH - SEA

DLHSEA

Duluth Intl

Fri 4/24

12:46 pm-11:53 pm

1 stop13h 07m

Seattle/Tacoma Intl

Mon 4/27

11:59 pm-12:06 pm

1 stop10h 07m

$395

DuluthSeattle

DLH - SEA

DLHSEA

Duluth Intl

Fri 4/24

11:19 am-7:00 pm

1 stop9h 41m

Seattle/Tacoma Intl

Tue 4/28

7:37 pm-10:29 am

2 stops12h 52m

$423

Flights are sorted by cheapest round-trip flights first.

Sorted 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.

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 04m
Direct flights	None

The fastest flight from Duluth to Seattle takes 6h 04m

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 04m, 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 January 2026.
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 64% of the total bookings. Other popular airlines include United Airlines with 19% and Sun Country Air with 17%.

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 6.9 342 reviews	Search Sun Country Air flights
United Airlines	PriceFrom $258	Free Cancellation	Rating 7.4 9,163 reviews	Search United Airlines flights
Delta	PriceFrom $258	Free Cancellation	Rating 7.9 8,048 reviews	Search Delta flights

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SeaTac

Ocean Shores

Renton

Olympia

Lynnwood

Kent

Marysville

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Tukwila

Cle Elum

Lakewood

Federal Way

Fife

Kirkland

Westport

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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.