$278 Cheap Flights from Casper (CPR) to Seattle (SEA)
Popular airlines from Casper, WY (CPR-Natrona County Intl.) to Seattle-Tacoma International Airport (SEA)
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Cheap Flights from Casper to Seattle (CPR-SEA)
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Casper (CPR) to Seattle (SEA) at a glance
Travel from Casper (CPR) to Seattle (SEA) with ease on this domestic short-haul route offered by full-service airlines. Discover the itinerary that suits your travel needs while you explore the iconic attractions and vibrant neighborhoods of Seattle. Check out the essential details for flights from Natrona County International Airport (CPR) to Seattle-Tacoma International Airport (SEA) for your upcoming adventure.
- Fastest flight duration: around 4h 30m in-flight, plus roughly 1h 30m layover with one stop
- Route distance: roughly 800 miles (1,290 km)
- Flights per week: around 8 departures on average
- Typical fares (one-way): economy tickets often range from $130–$445, depending on seasonality and how far ahead you book
Flights from Natrona County International Airport (CPR) to Seattle - Tacoma International Airport (SEA)
Recent traveler bookings reveal the most popular airlines for flights from Casper to Seattle, primarily favored for their one-stop service, often with a layover at Denver International Airport (DEN) lasting about 1 hour and 30 minutes. This allows you to explore various combinations of price, total travel time, and cabin class to discover the ideal itinerary.
- United: As a comprehensive airline, United provides a seamless travel experience with one-stop options, boasting one-way fares that generally fall between $130 and $460. This carrier dominates the route, offering in-flight durations of 4 hours and 30 minutes, leading to a total journey time of about 5 hours and 45 minutes, including layovers.
Best time to fly from Casper (CPR) to Seattle (SEA)
The most popular months for travelers flying from Casper to Seattle are March, July, and August, when peak temperatures in Seattle reach up to 67.5°F in August. If you prefer quieter travel, consider November, the least busy time to visit with temperatures around 44.2°F and typically the lowest average one-way fare (around $188). Flight availability peaks in November and December, with approximately 11 flights per week, making it easier to find convenient departure times. February, March, April, and October have the fewest flights, with approximately 7 flights per week.
- Cheapest time to fly: November usually offers good deals with average one-way fare around $188, roughly 29% cheaper than the yearly average.
- Most flight options: November and December have the highest number of flights from Casper to Seattle, with approximately 11 flights per week, giving you more flexibility in scheduling your trip.
| Month | Temperature | Demand | Weekly Flights | Average one-way Fare |
| January | 40.3°F (4.6°C) | Average | 8 | $258 |
| February | 40.5°F (4.7°C) | Average | 7 | $238 |
| March | 43.9°F (6.6°C) | High | 7 | $226 |
| April | 48.6°F (9.2°C) | Low | 7 | $328 |
| May | 55.8°F (13.2°C) | Average | 9 | $296 |
| June | 61.0°F (16.1°C) | Average | 8 | $339 |
| July | 67.1°F (19.5°C) | High | 10 | $280 |
| August | 67.5°F (19.7°C) | High | 9 | $272 |
| September | 61.3°F (16.3°C) | Average | 10 | $241 |
| October | 52.7°F (11.5°C) | Low | 7 | $297 |
| November | 44.2°F (6.8°C) | Low | 11 | $188 |
| December | 39.2°F (4.0°C) | Average | 11 | $236 |
*Average one-way fare is based on Expedia flight booking data from January 2025 to April 2026 for the specified route and travel class and may change depending on availability, dates, and demand.
Alternative route from Casper (CPR) to Seattle (SEA)
- Casper to Seattle (CPR-BFI): Boeing Field Airport (BFI) is located approximately 6 miles from Seattle-Tacoma International Airport (SEA), providing a convenient alternative for travelers heading to the Seattle area.
How to find the best prices for flights from Casper (CPR) to Seattle (SEA)
Getting some of the best deals on flights from Casper to Seattle is all about timing and flexibility. Here are some key tips to help you save:
- Best times to book and fly: cheaper fares are usually found when booking at least two months in advance, although most travelers tend to book two to eight weeks ahead. Morning departures between 5 a.m. and 12 p.m. often offer lower prices and are the most popular. Additionally, flying on Thursdays typically results in cheaper fares, while Fridays remain the most popular travel day.
- Set up price alerts: stay updated on price changes by using Expedia's Price Tracker. Receive alerts when fares drop for your selected route.
- Bundle and save: bundle your flight and hotel to save on Expedia, or unlock a hotel deal after booking your flight.*
- Compare flight options: use Expedia's search tool to compare airlines, routes, direct vs. non-direct flights, and flight times. You can also sort by price to find the most affordable options.
- Stay flexible with dates: being open to different travel days can sometimes help you find better prices on flights and hotels.
- Think about luggage: nowadays, it's important to check the airline's baggage policies to find the best value. That may be paying for an additional carry-on bag or booking a ticket with checked luggage included. Either way, double-check your allowance before confirming your booking to avoid excess baggage fees at the airport.
*Members only. Savings vary and are not available on all bundles. Select hotels.
Arriving at Seattle - Tacoma International Airport from Natrona County International Airport
Seattle welcomes travelers from Casper with a range of transport options based on price, convenience, and proximity. Seattle city center is approximately a 20-minute drive (covering about 14 miles) from Seattle - Tacoma International Airport, depending on traffic. Here's how to reach Seattle efficiently:
- Hotel transfer: Transfers offer a convenient way to reach your hotel in Seattle, with private rides that can be arranged in advance.
- Car rental: Renting a car from Seattle - Tacoma International Airport is a great option if you plan to explore and sightsee beyond the city. Browse cheap car rentals at Seattle - Tacoma International Airport on Expedia.
- Taxi/ride-hailing: Taxis and ride-hailing services may be available from designated pickup areas outside the terminal, check locally on arrival.
- Public transportation: From Seattle - Tacoma International Airport, SeaTac/Airport Station, a metro station, is located about 0.3 miles from the airport and is reachable on foot, while Tukwila Station, a train station, lies approximately 4.3 miles away and is best accessed by car.
Casper to Seattle Flights
The cheapest times to fly from Casper to Seattle
On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Casper to Seattle are during the month of December. You can find some of the cheapest flights from Casper to Seattle with Expedia's search tool and vast selection of airlines.
The best time to book a flight from Casper to Seattle
Sunday is one of the best days to book for cheap flights from Casper to Seattle: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.
How to find cheap round-trip tickets from Casper to Seattle
Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Casper to Seattle in 2026. You can also book with separate airlines for your outbound and return journeys, from $278 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.
Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Casper to Seattle flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.
You could also save big by booking one of Expedia's vacation packages. Bundling together your Casper to Seattle airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.
*Terms apply.
Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.
Frequently Asked Questions
How much does a flight from Casper, WY (CPR-Natrona County Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.) cost?
You can find cheap one-way flights from $278 and cheap return flights $328 Casper, WY (CPR-Natrona County Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.) with Expedia. One-way flights usually range from $305 to $837, and return flights typically cost between $402 and $1504. Flight prices vary based on the month and day of the week you want to travel, as well as the airline and how far in advance you book your ticket. Filter your search on Expedia by "Price (lowest to highest)" to see the cheapest fares first, and use the Price Tracking tool to receive alerts when Casper, WY (CPR-Natrona County Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.) ticket fares go up or down.
*Typical price ranges based on flights available on Expedia in the last year. Prices include multi-airline options.
What is the cheapest month to fly from Casper, WY (CPR-Natrona County Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
The cheapest month to fly from CPR to SEA is December when demand is low. Traveling in off-peak or shoulder months is usually a good way to secure cheap tickets, just remember to avoid flying during holidays if you're able to. Use the calendar view in your search to see which months have low fares on this route.
Which airlines fly direct from Casper, WY (CPR-Natrona County Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
Enter CPR to SEA and your travel dates, then apply the 'Nonstop' filter to see only direct flights.
What is the cheapest airline that flies from Casper, WY (CPR-Natrona County Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
United is one of the cheapest airlines offering connecting flights from Casper, WY (CPR) to Seattle, WA (SEA), with round-trip tickets starting from around $238. Use Expedia's search tool to compare the prices and schedules of airlines that fly this route to find the best option for your plans and budget.
*Prices based on flights available on Expedia in the last year.
How do I find cheap flights from Casper, WY (CPR-Natrona County Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
To find a cheap flight from Casper, WY (CPR-Natrona County Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.), be flexible with your dates. Traveling outside of peak vacation months and booking a mid-week flight can help you save. Early morning and late night flights are often more affordable, too. Expedia allows you to compare flight times, airlines and routes all in one place to find low fares. You can also set up Price Tracking and receive alerts when fares go up or down.
What is the best time to fly from Casper, WY (CPR-Natrona County Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
The best time to fly is usually mid-week (Tuesday or Wednesday) and during early morning hours as flights tend to be cheaper, less crowded, and generally more on-time. Avoid major holidays and peak vacation seasons for smoother travel. Combining off-peak days and hours often gives the best combination of cost, comfort, and convenience.
What is the earliest flight from Casper, WY (CPR-Natrona County Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
The earliest flight from Natrona County International Airport (CPR) in Casper to Seattle-Tacoma International Airport (SEA) usually departs at around 5:15 AM, operated by United and Alaska Airlines. This seasonal service is available in February and March, allowing you to start your day early in Seattle. To compare early flights on Expedia, select the "Early Morning" and "Morning" filters in your search.
What are the most popular departure times for flights from Casper, WY (CPR-Natrona County Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
The most popular departure times for flights from Casper (CPR) to Seattle (SEA) are in the late morning, from 9am to noon. About 29% of passengers prefer this time window. Many major carriers, including United Airlines, offer flights during this window. This timing is convenient as it allows you to start your day in Casper before heading to the vibrant city of Seattle.
How long does it take to fly from Casper, WY (CPR-Natrona County Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
Flying from CPR to SEA with a connection usually takes about 5 hours 50 minutes, traveling roughly 831 miles. Keep in mind that actual flight times can vary due to wind patterns, weather, and air traffic.
Can you fly business or first class from Casper, WY (CPR-Natrona County Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
First class seats are offered on the CPR to SEA route with United Airlines.
How do I earn miles on a Casper, WY (CPR-Natrona County Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.) flight with Expedia?
It's easy to earn miles on a Casper, WY (CPR-Natrona County Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.) flight when you book with Expedia. Before you confirm your booking, simply select your frequent flyer program and enter your program number. As a member of One Key™, you can also earn OneKeyCash™* on top of your airline miles when you book with Expedia.
*Excludes taxes and fees. OneKeyCash is not redeemable for cash and can only be used on Expedia and other participating brands.
What airports do you fly into for Seattle from Natrona County Intl. (CPR)?
If you're planning to travel to Seattle from Natrona County Intl. (CPR), you can fly into Seattle - Tacoma Intl. (SEA) Some flights may connect through major hubs like Denver Intl. (DEN) before reaching Seattle. Compare routes and airports on Expedia to find the best flight options for your travel plans.
Is it cheaper to buy a plane ticket from Casper, WY (CPR-Natrona County Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.) at the last minute?
Typically, booking a last minute flight from Casper, WY (CPR-Natrona County Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.) will be more expensive than booking in advance. As the departure date approaches, there are usually fewer seats available which can drive up the cost. However, if there's some wiggle room with your travel dates and times, you could bag a cheap last-minute fare.
Is it cheaper to book a Casper, WY (CPR-Natrona County Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.) flight and hotel package?
Securing a Casper, WY (CPR-Natrona County Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.) Seattle Vacation Packages is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Select from our extensive range of stays and then add flights, activities and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Casper, WY (CPR-Natrona County Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
If you booked your Casper, WY (CPR-Natrona County Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.) flight within the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the type of ticket you have, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal if you'd like more information.
Travel information
Origin airport | Casper, WY |
|---|---|
Destination airport | Seattle-Tacoma International Airport |
Distance | 831 miles away |
Airlines serving | United |
Popular airline | United |
Roundtrip price | $328 |