Frontier Airlines Flight AA91 Deals & Information (2025/2026)

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Frontier Airlines Flight 91 Route Deals From $152

The cheapest prices found with in the last 7 days for return flights were $203 and $152 for one-way flights to Cancun Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Mon, Jul 28 - Tue, Jul 29
PHL
Philadelphia Intl.
CUN
Cancun Intl.
$203 Roundtrip, found 4 days ago
$203
Roundtrip
found 4 days ago
Select Frontier Airlines flight, departing Mon, Jul 28 from Philadelphia Intl. to Cancun Intl., returning Tue, Jul 29, priced at $203 found 4 days ago
Sun, Jul 6 - Mon, Jul 14
PHL
Philadelphia Intl.
CUN
Cancun Intl.
$239 Roundtrip, found 3 days ago
$239
Roundtrip
found 3 days ago
Select Frontier Airlines flight, departing Sun, Jul 6 from Philadelphia Intl. to Cancun Intl., returning Mon, Jul 14, priced at $239 found 3 days ago
Thu, Jul 10 - Mon, Jul 14
TTN
Mercer
CUN
Cancun Intl.
$334 Roundtrip, found 6 days ago
$334
Roundtrip
found 6 days ago
Select Frontier Airlines flight, departing Thu, Jul 10 from Mercer to Cancun Intl., returning Mon, Jul 14, priced at $334 found 6 days ago
Fri, Aug 1 - Mon, Aug 4
TTN
Mercer
CUN
Cancun Intl.
$338 Roundtrip, found 6 days ago
$338
Roundtrip
found 6 days ago
Select Frontier Airlines flight, departing Fri, Aug 1 from Mercer to Cancun Intl., returning Mon, Aug 4, priced at $338 found 6 days ago
Fri, Jul 18 - Thu, Jul 24
TTN
Mercer
CUN
Cancun Intl.
$341 Roundtrip, found 6 days ago
$341
Roundtrip
found 6 days ago
Select Frontier Airlines flight, departing Fri, Jul 18 from Mercer to Cancun Intl., returning Thu, Jul 24, priced at $341 found 6 days ago
Fri, Jul 11 - Mon, Jul 14
TTN
Mercer
CUN
Cancun Intl.
$342 Roundtrip, found 6 days ago
$342
Roundtrip
found 6 days ago
Select Frontier Airlines flight, departing Fri, Jul 11 from Mercer to Cancun Intl., returning Mon, Jul 14, priced at $342 found 6 days ago
Mon, Aug 4 - Mon, Aug 11
TTN
Mercer
CUN
Cancun Intl.
$345 Roundtrip, found 6 days ago
$345
Roundtrip
found 6 days ago
Select Frontier Airlines flight, departing Mon, Aug 4 from Mercer to Cancun Intl., returning Mon, Aug 11, priced at $345 found 6 days ago
Fri, Jul 18 - Thu, Jul 24
TTN
Mercer
CUN
Cancun Intl.
$349 Roundtrip, found 6 days ago
$349
Roundtrip
found 6 days ago
Select Frontier Airlines flight, departing Fri, Jul 18 from Mercer to Cancun Intl., returning Thu, Jul 24, priced at $349 found 6 days ago
Fri, Jul 18 - Thu, Jul 24
TTN
Mercer
CUN
Cancun Intl.
$350 Roundtrip, found 6 days ago
$350
Roundtrip
found 6 days ago
Select Frontier Airlines flight, departing Fri, Jul 18 from Mercer to Cancun Intl., returning Thu, Jul 24, priced at $350 found 6 days ago
Fri, Aug 15 - Sun, Aug 24
TTN
Mercer
CUN
Cancun Intl.
$353 Roundtrip, found 6 days ago
$353
Roundtrip
found 6 days ago
Select Frontier Airlines flight, departing Fri, Aug 15 from Mercer to Cancun Intl., returning Sun, Aug 24, priced at $353 found 6 days ago

Frequently asked questions

What route does flight number F991 take?
Flight number F991 operates directly from Philadelphia Airport to Cancun Intl. Airport (CUN). During this trip, expect to be in the air for about 4 hours. It’s wise to book ahead to secure your preferred seat.
What terminal does F991 fly out of?
You’ll likely be jetting out of Terminal E if you’re flying on F991 direct from Philadelphia Intl. Airport (PHL) to Cancun Airport.
What kind of plane is on flight number F991?
There’s every chance you’ll find yourself jumping on board an Airbus A320 if you’re traveling on flight number F991. Generally, this flight departs from Philadelphia Airport and comes in to land at Cancun Airport.
If I am not able to travel due to COVID-19, can I change my flight to a later date?
For more info about changing your F991 flight with Travelocity, please visit our Customer Service Portal.