$316 Cheap Flights from Bismarck (BIS) to Rock Springs (RKS)

View $316 flight on Thu, Jul 17, 2025Opens in a new window

Popular airlines from Bismarck, ND (BIS-Bismarck Municipal) to Rock Springs, WY (RKS-Sweetwater County)

Cheap Flights from Bismarck to Rock Springs (BIS-RKS)

Prices were available within the past 7 days and start at $316 for one-way flights and $308 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Thu, Aug 21 - Sun, Aug 31
BIS
Bismarck
RKS
Rock Springs
$308 Roundtrip, found 14 hours ago
$308
Roundtrip
found 14 hours ago
Select United flight, departing Thu, Aug 21 from Bismarck to Rock Springs, returning Sun, Aug 31, priced at $308 found 14 hours ago
United
Thu, Aug 21 - Mon, Sep 1
BIS
Bismarck
RKS
Rock Springs
$313 Roundtrip, found 14 hours ago
$313
Roundtrip
found 14 hours ago
Select United flight, departing Thu, Aug 21 from Bismarck to Rock Springs, returning Mon, Sep 1, priced at $313 found 14 hours ago
United
Sun, Sep 28 - Mon, Oct 13
BIS
Bismarck
RKS
Rock Springs
$318 Roundtrip, found 14 hours ago
$318
Roundtrip
found 14 hours ago
Select United flight, departing Sun, Sep 28 from Bismarck to Rock Springs, returning Mon, Oct 13, priced at $318 found 14 hours ago
United
Fri, Jul 11 - Fri, Jul 25
BIS
Bismarck
RKS
Rock Springs
$343 Roundtrip, found 15 hours ago
$343
Roundtrip
found 15 hours ago
Select United flight, departing Fri, Jul 11 from Bismarck to Rock Springs, returning Fri, Jul 25, priced at $343 found 15 hours ago
United
Mon, Aug 18 - Sun, Aug 31
BIS
Bismarck
RKS
Rock Springs
$353 Roundtrip, found 14 hours ago
$353
Roundtrip
found 14 hours ago
Select United flight, departing Mon, Aug 18 from Bismarck to Rock Springs, returning Sun, Aug 31, priced at $353 found 14 hours ago
United
Mon, Aug 18 - Mon, Sep 1
BIS
Bismarck
RKS
Rock Springs
$358 Roundtrip, found 14 hours ago
$358
Roundtrip
found 14 hours ago
Select United flight, departing Mon, Aug 18 from Bismarck to Rock Springs, returning Mon, Sep 1, priced at $358 found 14 hours ago
United
Fri, Jul 11 - Tue, Jul 29
BIS
Bismarck
RKS
Rock Springs
$383 Roundtrip, found 15 hours ago
$383
Roundtrip
found 15 hours ago
Select United flight, departing Fri, Jul 11 from Bismarck to Rock Springs, returning Tue, Jul 29, priced at $383 found 15 hours ago
United
Fri, Sep 26 - Wed, Oct 15
BIS
Bismarck
RKS
Rock Springs
$394 Roundtrip, found 14 hours ago
$394
Roundtrip
found 14 hours ago
Select United flight, departing Fri, Sep 26 from Bismarck to Rock Springs, returning Wed, Oct 15, priced at $394 found 14 hours ago
United
Tue, Sep 30 - Thu, Oct 16
BIS
Bismarck
RKS
Rock Springs
$398 Roundtrip, found 14 hours ago
$398
Roundtrip
found 14 hours ago
Select United flight, departing Tue, Sep 30 from Bismarck to Rock Springs, returning Thu, Oct 16, priced at $398 found 14 hours ago
United
Sun, Aug 17 - Sun, Aug 31
BIS
Bismarck
RKS
Rock Springs
$418 Roundtrip, found 14 hours ago
$418
Roundtrip
found 14 hours ago
Select United flight, departing Sun, Aug 17 from Bismarck to Rock Springs, returning Sun, Aug 31, priced at $418 found 14 hours ago

Alternative airports near Rock Springs

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Sweetwater County RKS. Cheapest and Closest option available. Average driving time to city center is 14 minutes. Flights from $313
RKS
Sweetwater County
CheapestClosest
Average driving time to city center14 min
Flights from $313
Flights from Bismarck (BIS) to Rock Springs (RKS)
Origin airport
Bismarck Municipal
Destination airport
Sweetwater County
Airlines serving
United
Roundtrip price
$308
Distance
544 mi

Bismarck to Rock Springs Flights

The cheapest times to fly from Bismarck to Rock Springs

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 Bismarck to Rock Springs are during the month of August. You can find some of the cheapest flights from Bismarck to Rock Springs with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Bismarck to Rock Springs

Sunday is one of the best days to book for cheap flights from Bismarck to Rock Springs: 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 Bismarck to Rock Springs

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 Bismarck to Rock Springs in 2025. You can also book with separate airlines for your outbound and return journeys, from $316 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 Bismarck to Rock Springs 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 Bismarck to Rock Springs 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 Bismarck Municipal Airport (BIS) to Sweetwater County Airport (RKS) cost?
Discover the latest flight deals from BIS to RKS by entering your preferred travel dates and searching on Expedia. Easily compare prices by departure date if you have flexibility with your schedule and use handy filters to explore prices for your preferred journey. As a member of One Key™, our free loyalty program, you can use Price Tracking to watch fares and receive notifications if prices go up or down.
What is the cheapest month to fly from BIS to RKS?
The cheapest flights from BIS to RKS are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
What is the cheapest airline that flies from BIS to RKS?
Use the filter tool on Expedia to compare airlines and find the cheapest carrier that'll take you from BIS to RKS. Sort your results by "Price (lowest to highest)" to snap up a great deal.
How many flights per day from Bismarck Municipal Airport (BIS) to Sweetwater County Airport (RKS)?
There are no daily nonstop flights departing from Bismarck Municipal Airport (BIS) to Sweetwater County Airport (RKS). But you can choose flights with layovers. Filter your search results on Expedia to include one or two stops, and you'll be on your way before you know it.
What day of the week has the most flights from BIS to RKS?
You'll generally find Tuesday the quietest day for flights, while Fridays are often the busiest.* However this can vary from season to season and during public holidays or peak travel times.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Bismarck Municipal Airport (BIS) to Sweetwater County Airport (RKS)?
To avoid potential delays on the Bismarck Municipal Airport (BIS) to Sweetwater County Airport (RKS) route, aim to fly before 3 PM. Flights after this time have a 22% higher chance of being canceled.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from Bismarck Municipal Airport (BIS) to Sweetwater County Airport (RKS) last-minute?
Holding off until right before your break to book a ticket from BIS to RKS generally means paying more. While it's possible to find some last-minute offers, there's no guarantee. Keep your travel schedule open for the best chance of scoring a bargain.
Is it cheaper to book a BIS to RKS flight and hotel package?
Compared with arranging hotels and flights separately, booking a BIS to RKS flight and hotel package with Expedia could lead to significant savings. Better yet, having everything in one place will take the stress out of planning your trip. Just pick your flights and choose from our wide range of hotels, then customize your trip with extras like activities and car rentals.
Can I cancel or change the date of my flight from Bismarck Municipal Airport (BIS) to Sweetwater County Airport (RKS)?
In most instances, you're able to reschedule or cancel your BIS to RKS flight. However, there may be additional charges, especially if your booking was made over 24 hours ago. Double-check your itinerary for the airline's rules and fees on flight changes, or if you want further information, head to our Customer Service portal.

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*Available to One Key members.