What is the cheapest airline that flies from Casper Natrona County to Seattle/Tacoma Intl?

United Airlines is the most popular carrier operating from Casper Natrona County to Seattle/Tacoma Intl

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

Prices for flights from Casper Natrona County Airport to Seattle/Tacoma Intl Airport were last updated today.

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

As of February 2026, there is 1 operator available to choose from for flights from Casper Natrona County Airport to Seattle/Tacoma Intl Airport.

How old do you have to be to fly from Casper Natrona County Airport to Seattle/Tacoma Intl Airport?

The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Casper Natrona County 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.

$258 Cheap Flights from Casper to Seattle in 2026

Q: What is the typical price of a round-trip flight between Casper and Seattle?

Prices are currently low for flights on this route. Typical prices usually range from $291 to $326. The lowest price recently found on this route was $258.

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Find the cheapest flights from Casper to Seattle

Round-trip

One-way

Cheap round-trip flights

Enter your travel dates to find the best prices.

6:08 pm - 10:59 pm

CPR

SEA

5h 51m

1 stop

5:00 am - 12:50 pm

SEA

CPR

6h 50m

1 stop

$258United Airlines

Thu, Feb 26 - Sat, Mar 7

1:20 pm - 10:13 pm

CPR

SEA

9h 53m

2 stops

5:00 am - 10:51 am

SEA

CPR

4h 51m

1 stop

$264United Airlines

Thu, Feb 26 - Sat, Mar 7

1:20 pm - 6:03 pm

CPR

SEA

5h 43m

1 stop

9:00 am - 5:01 pm

SEA

CPR

7h 01m

1 stop

$268United Airlines

Wed, Feb 18 - Sun, Feb 22

1:20 pm - 10:13 pm

CPR

SEA

9h 53m

2 stops

12:55 pm - 8:26 pm

SEA

CPR

6h 31m

1 stop

$302United Airlines

Wed, Feb 18 - Sun, Feb 22

1:20 pm - 10:13 pm

CPR

SEA

9h 53m

2 stops

9:20 am - 9:59 pm

SEA

CPR

11h 39m

2 stops

$339United Airlines

Thu, Feb 26 - Sat, Mar 7

5:25 am - 9:49 am

CPR

SEA

5h 24m

1 stop

5:00 am - 8:36 pm

SEA

CPR

14h 36m

2 stops

$369United Airlines

Thu, Mar 5 - Sun, Mar 8

6:08 pm - 11:09 pm

CPR

SEA

6h 01m

1 stop

5:00 am - 12:39 pm

SEA

CPR

6h 39m

1 stop

$372United Airlines

Fri, Jun 5 - Sun, Jun 7

5:25 am - 4:14 pm

CPR

SEA

11h 49m

2 stops

5:00 am - 8:36 pm

SEA

CPR

14h 36m

2 stops

$374United Airlines

Thu, Mar 5 - Sun, Mar 8

11:26 am - 9:01 pm

CPR

SEA

10h 35m

3 stops

9:00 am - 5:01 pm

SEA

CPR

7h 01m

1 stop

$379United Airlines

Wed, Feb 18 - Sun, Feb 22

1:25 pm - 11:16 pm

CPR

SEA

10h 51m

2 stops

7:10 pm - 10:51 am

SEA

CPR

14h 41m

1 stop

$407United Airlines

Mon, Mar 9 - Fri, Mar 13

United Airlines flights from Casper to Seattle

Our best United Airlines deals on Casper to Seattle flight tickets

United Airlines

Feb 26

CPR6:08 pmCasper Natrona County

5h 51m

1 stop

SEA10:59 pmSeattle/Tacoma Intl

Mar 7

SEA5:00 amSeattle/Tacoma Intl

6h 50m

1 stop

CPR12:50 pmCasper Natrona County

$258

United Airlines

Feb 26

CPR1:20 pmCasper Natrona County

9h 53m

2 stops

SEA10:13 pmSeattle/Tacoma Intl

Mar 7

SEA5:00 amSeattle/Tacoma Intl

4h 51m

1 stop

CPR10:51 amCasper Natrona County

$264

United Airlines

Feb 18

CPR1:20 pmCasper Natrona County

5h 43m

1 stop

SEA6:03 pmSeattle/Tacoma Intl

Feb 22

SEA9:00 amSeattle/Tacoma Intl

7h 01m

1 stop

CPR5:01 pmCasper Natrona County

$268

Fly from

Fly to

Route

Depart

Return

Price

CasperSeattle

CPR - SEA

CPRSEA

Casper Natrona County

Thu 2/26

6:08 pm-10:59 pm

1 stop5h 51m

Seattle/Tacoma Intl

Sat 3/7

5:00 am-12:50 pm

1 stop6h 50m

$258

CasperSeattle

CPR - SEA

CPRSEA

Casper Natrona County

Thu 2/26

1:20 pm-10:13 pm

2 stops9h 53m

Seattle/Tacoma Intl

Sat 3/7

5:00 am-10:51 am

1 stop4h 51m

$264

CasperSeattle

CPR - SEA

CPRSEA

Casper Natrona County

Wed 2/18

1:20 pm-6:03 pm

1 stop5h 43m

Seattle/Tacoma Intl

Sun 2/22

9:00 am-5:01 pm

1 stop7h 01m

$268

CasperSeattle

CPR - SEA

CPRSEA

Casper Natrona County

Wed 2/18

1:20 pm-10:13 pm

2 stops9h 53m

Seattle/Tacoma Intl

Sun 2/22

12:55 pm-8:26 pm

1 stop6h 31m

$302

CasperSeattle

CPR - SEA

CPRSEA

Casper Natrona County

Thu 2/26

1:20 pm-10:13 pm

2 stops9h 53m

Seattle/Tacoma Intl

Sat 3/7

9:20 am-9:59 pm

2 stops11h 39m

$339

CasperSeattle

CPR - SEA

CPRSEA

Casper Natrona County

Thu 3/5

5:25 am-9:49 am

1 stop5h 24m

Seattle/Tacoma Intl

Sun 3/8

5:00 am-8:36 pm

2 stops14h 36m

$369

CasperSeattle

CPR - SEA

CPRSEA

Casper Natrona County

Fri 6/5

6:08 pm-11:09 pm

1 stop6h 01m

Seattle/Tacoma Intl

Sun 6/7

5:00 am-12:39 pm

1 stop6h 39m

$372

CasperSeattle

CPR - SEA

CPRSEA

Casper Natrona County

Thu 3/5

5:25 am-4:14 pm

2 stops11h 49m

Seattle/Tacoma Intl

Sun 3/8

5:00 am-8:36 pm

2 stops14h 36m

$374

CasperSeattle

CPR - SEA

CPRSEA

Casper Natrona County

Wed 2/18

11:26 am-9:01 pm

3 stops10h 35m

Seattle/Tacoma Intl

Sun 2/22

9:00 am-5:01 pm

1 stop7h 01m

$379

CasperSeattle

CPR - SEA

CPRSEA

Casper Natrona County

Mon 3/9

1:25 pm-11:16 pm

2 stops10h 51m

Seattle/Tacoma Intl

Fri 3/13

7:10 pm-10:51 am

1 stop14h 41m

$407

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 12 resultsSorted by cheapest first

How to get the cheapest flight ticket from Casper 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 typical price of a round-trip flight between Casper and Seattle?

What is the cheapest month to fly to Seattle?

In general, February is the cheapest month to fly from Casper to Seattle. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $310. If you don’t want to visit Seattle in February, then you should wait until April to fly from Casper, when ticket prices are also cheap, with an average price of $343.

When to book flights from Casper to Seattle

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

Estimated round-trip price

Cheap Casper to Seattle (CPR to SEA) flight deals and tips

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

Fastest flight time	5h 24m
Direct flights	None

The fastest flight from Casper to Seattle takes 5h 24m

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

Search flight deals

How far is Casper Natrona County to Seattle/Tacoma Intl by plane?
Casper Natrona County and Seattle/Tacoma Intl are 843.3 mi apart from one another. Flights usually cover this in 5h 24m, depending on flying conditions and air traffic around both airports.
When did momondo last update prices for flights from Casper Natrona County Airport to Seattle/Tacoma Intl Airport?
Prices for flights from Casper Natrona County Airport to Seattle/Tacoma Intl Airport were last updated today.
How many operators does momondo search for flights from Casper Natrona County Airport to Seattle/Tacoma Intl Airport?
As of February 2026, there is 1 operator available to choose from for flights from Casper Natrona County Airport to Seattle/Tacoma Intl Airport.
How old do you have to be to fly from Casper Natrona County Airport to Seattle/Tacoma Intl Airport?
The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Casper Natrona County 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 Casper to Seattle?
Based on momondo bookings for this flight route, the most popular airline on flight routes from Casper to Seattle is United Airlines (100% of total bookings).

Best airlines flying from Casper to Seattle

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

Airline	Rating	Free Cancellation	Price
United Airlines	PriceFrom $256	Free Cancellation	Rating 7.4 9,240 reviews		Search United Airlines flights

Tacoma

Leavenworth

SeaTac

Ocean Shores

Renton

Olympia

Lynnwood

Kent

Marysville

Redmond

Puyallup

Cle Elum

Tukwila

Lakewood

Federal Way

Westport

Kirkland

Centralia

Fife

Tumwater

Why use momondo?

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

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Seattle from Casper.

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

Flights from Casper to Seattle with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

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

momondo helps you find the best flight between Casper and Seattle by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

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

Yes momondo offers price alerts on flights to Seattle from Casper. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

An easier way to manage your Seattle trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

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Sat 3/7

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Nearby airports

Airlines

Cabin classes

Other United States destinations

Other flights from Casper

Complete your trip

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Airports servicing Washington

Walla Walla Airport

Bellingham Airport

Wenatchee Pangborn Field Airport

Eastsound Orcas Island Airport

Friday Harbor SPB Airport

Spokane Airport

Kenmore Air Harbor Airport

Pasco Tri Cities Airport

Pullman Moscow Regional Airport

Rosario SPB Airport

Yakima Air Terminal Airport

Cheap flights from Casper to Seattle from $258

This is the cheapest round-trip flight price found by a momondo user in the last 72 hours by searching for a flight from Casper to Seattle departing on 2/26. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

Big names and deals

Big names and deals

Filter for what you want

Filter for what you want

Trusted and free

Trusted and free

Price Alerts

Price Alerts

Find the cheapest flights from Casper to Seattle

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United Airlines flights from Casper to Seattle

Our best United Airlines deals on Casper to Seattle flight tickets

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Use the filters below to find and compare flights from Casper to Seattle that are best for you.

See travel insights to Seattle from

How to get the cheapest flight ticket from Casper to Seattle

What is the typical price of a round-trip flight between Casper and Seattle?

What is the cheapest month to fly to Seattle?

What is the cheapest airline that flies from Casper Natrona County to Seattle/Tacoma Intl?

United Airlines is the most popular carrier operating from Casper Natrona County to Seattle/Tacoma Intl

When to book flights from Casper to Seattle

Cheap Casper to Seattle (CPR to SEA) flight deals and tips

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

Fastest flight time

Direct flights

How far is Casper Natrona County to Seattle/Tacoma Intl by plane?

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

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

How old do you have to be to fly from Casper Natrona County Airport to Seattle/Tacoma Intl Airport?

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

What is the most popular airline from Casper to Seattle?

Best airlines flying from Casper to Seattle

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

Traveling to a place near Seattle?

Why use momondo?

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

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

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

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

An easier way to manage your Seattle trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to the United States

Airports servicing Washington

Fly your favorite airline to Seattle

Airlines are sorted and displayed according to clicks in the past 7 days on momondo

Cabin classes currently available on flights to Seattle

List of cabin classes available on flights landing in Seattle. Availability may vary depending on flight origin and airline.

Popular cities in the United States

Popular flights according to clicks in the last 7 days on momondo

Fly to other destinations from Casper

According to popular flight searches on momondo this year

Complete your trip to Seattle

Explore popular destinations other users love

According to popular flight searches on momondo this year