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Cheap flights from Portland, Maine to Casper from $527

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, Maine to Casper departing on 5/14. 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
0 bags

Find the cheapest flights from Portland, Maine to Casper

Cheap round-trip flights

Enter your travel dates to find the best prices.
United Airlines Logo
3:23 pm - 10:10 pm
PWM
-
CPR
8h 47m
1 stop
United Airlines Logo
5:25 am - 3:41 pm
CPR
-
PWM
8h 16m
1 stop
$527United Airlines
Thu, May 14 - Tue, May 19
United Airlines Logo
3:23 pm - 10:10 pm
PWM
-
CPR
8h 47m
1 stop
United Airlines Logo
6:10 pm - 8:49 am
CPR
-
PWM
12h 39m
2 stops
$544United Airlines
Thu, May 14 - Tue, May 19
United Airlines Logo
11:08 am - 10:10 pm
PWM
-
CPR
13h 02m
2 stops
United Airlines Logo
6:10 pm - 8:49 am
CPR
-
PWM
12h 39m
2 stops
$774United Airlines
Thu, May 14 - Tue, May 19

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United Airlines flights from Portland, Maine to Casper

Our best United Airlines deals on Portland, Maine to Casper flight tickets
United Airlines
May 14
PWM3:23 pmPortland
8h 47m
1 stop
CPR10:10 pmCasper Natrona County
May 19
CPR5:25 amCasper Natrona County
8h 16m
1 stop
PWM3:41 pmPortland
$527
United Airlines
May 14
PWM3:23 pmPortland
8h 47m
1 stop
CPR10:10 pmCasper Natrona County
May 19
CPR6:10 pmCasper Natrona County
12h 39m
2 stops
PWM8:49 amPortland
$544
United Airlines
May 14
PWM11:08 amPortland
13h 02m
2 stops
CPR10:10 pmCasper Natrona County
May 19
CPR6:10 pmCasper Natrona County
12h 39m
2 stops
PWM8:49 amPortland
$774

momondo Fare Finder

 
Customize your flight search to find flights from Portland, Maine to Casper 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 April 21, 2026.
Use the filters below to find and compare flights from Portland, Maine to Casper that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip
Quickest round-trip

PortlandCasper

PWM - CPR

PWMCPR

Portland

Thu 5/14

3:23 pm-10:10 pm

1 stop8h 47m

Casper Natrona County

Tue 5/19

5:25 am-3:41 pm

1 stop8h 16m

$527

PortlandCasper

PWM - CPR

PWMCPR

Portland

Thu 5/14

3:23 pm-10:10 pm

1 stop8h 47m

Casper Natrona County

Tue 5/19

6:10 pm-8:49 am

2 stops12h 39m

$544

PortlandCasper

PWM - CPR

PWMCPR

Portland

Thu 5/14

11:08 am-10:10 pm

2 stops13h 02m

Casper Natrona County

Tue 5/19

6:10 pm-8:49 am

2 stops12h 39m

$774

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

When to book flights from Portland, Maine to Casper

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

Cheap Portland, Maine to Casper (PWM to CPR) flight deals and tips

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

Fastest flight time

8h 47m

Direct flights

None
The fastest flight from Portland, Maine to Casper takes 8h 47m
There are no direct flights from Portland, Maine to Casper. There are no popular flight routes from Portland, Maine to Casper.
Search flight deals

Frequently asked questions about flying from Portland, Maine to Casper

  • How far is Portland to Casper Natrona County by plane?

    There are 1800.3 mi between Portland and Casper Natrona County. Flights usually cover this in 8h 47m, depending on flying conditions and air traffic around both airports.

  • When did momondo last update prices for flights from Portland Airport to Casper Natrona County Airport?

    Prices for flights from Portland Airport to Casper Natrona County Airport are updated daily.

  • How old do you have to be to fly from Portland Airport to Casper Natrona County 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 Portland Airport to Casper Natrona County Airport.

  • What documentation or ID do you need to fly to Casper Natrona County Airport?

    The required travel and health documents for your Casper Natrona 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 Casper Natrona County Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

Frequently asked questions about flying from Portland, Maine to Casper

  • How do I get Price Alerts for flights from Portland, Maine to Casper?

    Search flight deals from Portland, Maine to Casper. While viewing offers you’ll have the option to create a Price Alert.

  • How can I save money on flights from Portland, Maine to Casper with momondo?

    Leverage our AI within our “Price Forecast” tool, which predicts if it’s better to book now or wait until prices decrease. You can strategically pick the best days to fly and save money on your trip by using our “Price Calendar” tool. “Explore” shows an overview of how much it costs to fly to anywhere from a selected city or airport. Our “Discover” content is a great option for travel inspiration and money-saving tips, while “Price Alerts” will update you when prices change, so you can book when fares are right.

  • 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 Casper?

Book flights to Casper if you plan to visit one of these locations
Rawlins
Evansville
Douglas

Why use momondo?

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

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Portland to Casper. momondo saves you time and could save you money on your trip.

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

Yes. All flights to Casper from Portland on momondo can be compared and filtered by various policies on offer, including flexible booking.

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

momondo helps you find the best flight between Portland and Casper 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 Portland to Casper right now. Can momondo alert me if prices change?

Price alerts on flights to Casper from Portland are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

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Thu 5/21
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