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Cheap flights from Portland to Rock Springs from $318

This is the cheapest round-trip flight price found by a momondo user in the last 72 hours by searching for a flight from Portland to Rock Springs departing on 5/21. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

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Find the cheapest flights from Portland to Rock Springs

Cheap round-trip flights

Enter your travel dates to find the best prices.
United Airlines Logo
5:00 am - 1:31 pm
PDX
-
RKS
7h 31m
1 stop
United Airlines Logo
5:05 am - 9:47 am
RKS
-
PDX
5h 42m
1 stop
$318United Airlines
Thu, May 21 - Mon, May 25
United Airlines Logo
4:15 pm - 10:15 pm
PDX
-
RKS
5h 00m
1 stop
United Airlines Logo
2:15 pm - 9:14 pm
RKS
-
PDX
7h 59m
1 stop
$398United Airlines
Tue, Apr 21 - Sat, Apr 25
United Airlines Logo
5:00 am - 1:30 pm
PDX
-
RKS
7h 30m
1 stop
United Airlines Logo
2:15 pm - 12:44 am
RKS
-
PDX
11h 29m
2 stops
$404United Airlines
Tue, Apr 21 - Sat, Apr 25
United Airlines Logo
5:15 am - 10:15 pm
PDX
-
RKS
16h 00m
3 stops
United Airlines Logo
5:05 am - 9:47 am
RKS
-
PDX
5h 42m
1 stop
$409United Airlines
Thu, May 21 - Mon, May 25
United Airlines Logo
4:15 pm - 10:15 pm
PDX
-
RKS
5h 00m
1 stop
United Airlines Logo
5:15 am - 2:30 pm
RKS
-
PDX
10h 15m
2 stops
$439United Airlines
Thu, Apr 23 - Tue, Apr 28
United Airlines Logo
7:15 am - 10:15 pm
PDX
-
RKS
14h 00m
2 stops
United Airlines Logo
2:15 pm - 12:44 am
RKS
-
PDX
11h 29m
2 stops
$444United Airlines
Tue, Apr 21 - Sat, Apr 25
United Airlines Logo
8:35 am - 10:15 pm
PDX
-
RKS
12h 40m
2 stops
United Airlines Logo
5:05 am - 9:47 am
RKS
-
PDX
5h 42m
1 stop
$464United Airlines
Thu, May 21 - Mon, May 25
United Airlines Logo
3:30 pm - 10:15 pm
PDX
-
RKS
29h 45m
2 stops
United Airlines Logo
5:15 am - 4:33 pm
RKS
-
PDX
12h 18m
2 stops
$471United Airlines
Thu, Apr 23 - Tue, Apr 28
United Airlines Logo
5:15 am - 10:15 pm
PDX
-
RKS
16h 00m
3 stops
United Airlines Logo
5:05 am - 9:47 am
RKS
-
PDX
5h 42m
1 stop
$489United Airlines
Thu, May 21 - Mon, May 25
United Airlines Logo
5:00 am - 1:31 pm
PDX
-
RKS
7h 31m
1 stop
United Airlines Logo
2:16 pm - 10:20 am
RKS
-
PDX
21h 04m
2 stops
$508United Airlines
Thu, May 21 - Mon, May 25

United Airlines flights from Portland to Rock Springs

Our best United Airlines deals on Portland to Rock Springs flight tickets
United Airlines
May 21
PDX5:00 amPortland
7h 31m
1 stop
RKS1:31 pmRock Springs Sweetwater County
May 25
RKS5:05 amRock Springs Sweetwater County
5h 42m
1 stop
PDX9:47 amPortland
$318
United Airlines
Apr 21
PDX4:15 pmPortland
5h 00m
1 stop
RKS10:15 pmRock Springs Sweetwater County
Apr 25
RKS2:15 pmRock Springs Sweetwater County
7h 59m
1 stop
PDX9:14 pmPortland
$398
United Airlines
Apr 21
PDX5:00 amPortland
7h 30m
1 stop
RKS1:30 pmRock Springs Sweetwater County
Apr 25
RKS2:15 pmRock Springs Sweetwater County
11h 29m
2 stops
PDX12:44 amPortland
$404

momondo Fare Finder

 
Customize your flight search to find flights from Portland to Rock Springs that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated March 28, 2026.
Use the filters below to find and compare flights from Portland to Rock Springs that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

PortlandRock Springs

PDX - RKS

PDXRKS

Portland

Thu 5/21

5:00 am-1:31 pm

1 stop7h 31m

Rock Springs Sweetwater County

Mon 5/25

5:05 am-9:47 am

1 stop5h 42m

$318
Quickest round-trip

PortlandRock Springs

PDX - RKS

PDXRKS

Portland

Tue 4/21

4:15 pm-10:15 pm

1 stop5h 00m

Rock Springs Sweetwater County

Sat 4/25

2:15 pm-9:14 pm

1 stop7h 59m

$398

PortlandRock Springs

PDX - RKS

PDXRKS

Portland

Tue 4/21

5:00 am-1:30 pm

1 stop7h 30m

Rock Springs Sweetwater County

Sat 4/25

2:15 pm-12:44 am

2 stops11h 29m

$404

PortlandRock Springs

PDX - RKS

PDXRKS

Portland

Thu 5/21

5:15 am-10:15 pm

3 stops16h 00m

Rock Springs Sweetwater County

Mon 5/25

5:05 am-9:47 am

1 stop5h 42m

$409

PortlandRock Springs

PDX - RKS

PDXRKS

Portland

Thu 4/23

4:15 pm-10:15 pm

1 stop5h 00m

Rock Springs Sweetwater County

Tue 4/28

5:15 am-2:30 pm

2 stops10h 15m

$439

PortlandRock Springs

PDX - RKS

PDXRKS

Portland

Tue 4/21

7:15 am-10:15 pm

2 stops14h 00m

Rock Springs Sweetwater County

Sat 4/25

2:15 pm-12:44 am

2 stops11h 29m

$444

PortlandRock Springs

PDX - RKS

PDXRKS

Portland

Thu 5/21

8:35 am-10:15 pm

2 stops12h 40m

Rock Springs Sweetwater County

Mon 5/25

5:05 am-9:47 am

1 stop5h 42m

$464

PortlandRock Springs

PDX - RKS

PDXRKS

Portland

Thu 4/23

3:30 pm-10:15 pm

2 stops29h 45m

Rock Springs Sweetwater County

Tue 4/28

5:15 am-4:33 pm

2 stops12h 18m

$471

PortlandRock Springs

PDX - RKS

PDXRKS

Portland

Thu 5/21

5:15 am-10:15 pm

3 stops16h 00m

Rock Springs Sweetwater County

Mon 5/25

5:05 am-9:47 am

1 stop5h 42m

$489

PortlandRock Springs

PDX - RKS

PDXRKS

Portland

Thu 5/21

5:00 am-1:31 pm

1 stop7h 31m

Rock Springs Sweetwater County

Mon 5/25

2:16 pm-10:20 am

2 stops21h 04m

$508

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

When to book flights from Portland to Rock Springs

Are you open to changing your travel dates? Check out the ideal times to fly from Portland to Rock Springs according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Portland to Rock Springs (PDX to RKS) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Portland to Rock Springs

Fastest flight time

5h 00m

Direct flights

None
The fastest flight from Portland to Rock Springs takes 5h 00m
There are no direct flights from Portland to Rock Springs. There are no popular flight routes from Portland to Rock Springs.
Search flight deals

  • How far is Portland to Rock Springs Sweetwater County by plane?

    Portland and Rock Springs Sweetwater County are 725.7 mi apart from one another. By plane, this route typically takes 5h 00m.

  • When did momondo last update prices for flights from Portland Airport to Rock Springs Sweetwater County Airport?

    Prices for flights from Portland Airport to Rock Springs Sweetwater County Airport were last updated today.

  • How old do you have to be to fly from Portland Airport to Rock Springs Sweetwater County Airport?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Portland Airport to Rock Springs Sweetwater County Airport.

  • What documentation or ID do you need to fly to Rock Springs Sweetwater County Airport?

    The required travel and health documents for your Rock Springs Sweetwater County Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Rock Springs Sweetwater County Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

  • How do I get Price Alerts for flights from Portland to Rock Springs?

    Confirm your travel details to search for the latest offers for flights from Portland to Rock Springs. While browsing offers there will be the option to toggle “Price Alerts”. You’ll then receive updates when prices for the flight route increase or decrease.

  • How can I save money on flights from Portland to Rock Springs with momondo?

    Plan your trips smart with the “Price Forecast” feature, which uses flight data to help you pick the best days to fly for the lowest fares. Our “Price Calendar” helps you get the most for your money by showing you when it’s most advantageous to fly. Curate your own travel experiences for less with “Explore”. Expert travel hacks to fuel your next adventure are a click away with “Discover” by momondo. Set up our “Price Alerts” to track fare changes and book when prices are at their lowest point.

  • How does momondo find its flight prices?

    We show prices from over 700+ competitors with a single click. With options from airlines and OTAs from across our 30 international markets, we are able to show you a diverse range of deals to create your adventure.

Traveling to a place near Rock Springs?

Book flights to Rock Springs if you plan to visit one of these locations
Green River

Why use momondo?

Why should I use momondo to find a flight deal from Portland to Rock Springs?

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 Rock Springs from Portland.

Can I find flights from Portland to Rock Springs with flexible booking policies on momondo?

Yes. momondo enables you to select and highlight flights to Rock Springs from Portland with this policy.

How can momondo help me find flights from Portland to Rock Springs?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Rock Springs from Portland.

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

Yes momondo offers price alerts on flights to Rock Springs from Portland. 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.

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