First Class
Top PickSixty percent off First Class is the headline saving Seatfrog claims on its own site, measured against buying a First Class ticket outright. The figure comes from the auction model rather than a code: you bid on unsold First Class seats in the hours before departure, so the operator fills a seat that would otherwise travel empty and you pay well under the walk up fare.
Expires: Limited Time Offer
Friend
Refer someone to Seatfrog and you get £5 off your next upgrade while they get a fiver off their first, so the offer pays both sides rather than only the sender. Seatfrog's terms note that referral credits cannot be exchanged for cash and can expire before redemption, so use it on a journey you have already planned.
Expires: Limited Time Offer
Fees
Seatfrog charges no booking fee on ticket purchases, which is the quiet cost that separates rail booking apps from one another once the fares themselves are identical. On a cheap advance single a typical booking fee can be a meaningful share of the total, so the saving is largest on the smallest tickets.
Expires: Limited Time Offer
Auction
Rather than paying a fixed upgrade price, you enter an auction for the First Class seats still empty on your booked service. Seatfrog describes it as First Class without the price tag. Bidding closes shortly before departure, so the technique is to bid what the seat is genuinely worth to you and let the auction settle.
Expires: Limited Time Offer
Time
Train Swap moves your booking to a different departure rather than making you buy a fresh ticket when plans shift. For anyone holding an advance fare tied to a specific service, that is normally the expensive mistake, since advance tickets are not valid on another train.
Expires: Limited Time Offer
Stations
The app sells standard rail tickets to more than 3,400 destinations across the UK, not only the routes where upgrades are on offer. That makes it usable as your everyday booking app rather than something you open solely when chasing a First Class seat.
Expires: Limited Time Offer
Operators
Seatfrog lists LNER, Avanti West Coast, GWR, CrossCountry, TransPennine Express, Grand Central, Greater Anglia and Northern among its First Class partners. Check your operator before counting on an upgrade, because auctions only run on services where that operator has released seats.
Expires: Limited Time Offer
Download
The app itself costs nothing to download and there is no membership fee sitting behind it. Seatfrog says over a million customers have saved £110 million through it so far. Note that it is a mobile app only, on iOS and Android, so there is no desktop route to the auctions.
Expires: Limited Time Offer
Final
Worth knowing before your first auction: Seatfrog's terms state that bids are irrevocable and cannot be modified once placed. There is no lowering your offer or withdrawing it if you change your mind, so decide your ceiling before you bid rather than during the auction.
Expires: Limited Time Offer
Other stores selling the same kind of thing, worth a price check before you buy.
A practical savings guide for shoppers using Seatfrog UK offers.
Seatfrog does not really run discount codes, and looking for one misses how the saving works. It is an auction app: train operators release the First Class seats still empty on a service, and passengers already booked on that train bid for them in the hours before departure. The operator fills a seat that would otherwise travel empty, and you pay well under the walk up fare. Seatfrog puts the saving at up to 60% on First Class travel.
The offer you can actually trigger yourself is the referral. Refer someone and you get £5 off your next upgrade while they get a fiver off their first, so it pays both sides rather than only the sender.
Read the terms before banking on it though. Seatfrog states that referral credits cannot be exchanged for cash or any other benefit in kind, and that they may expire before you redeem them. Treat the credit as money off a journey you are already planning rather than something to bank for later.
Two things matter as much as the upgrade auctions. The app sells ordinary rail tickets to over 3,400 UK destinations with no booking fee, which on a cheap advance single is a bigger proportional saving than it sounds, since the fare itself is fixed by the operator and the fee is the only part that varies between apps.
Second, Train Swap moves an existing booking to a different departure instead of forcing a fresh ticket. Advance fares are tied to one specific service and are not valid on another train, so a plan that shifts by an hour normally means buying twice. That is the expensive mistake Train Swap exists to prevent.
Seatfrog lists LNER, Avanti West Coast, GWR, CrossCountry, TransPennine Express, Grand Central, Greater Anglia and Northern among its First Class partners. Auctions only run where an operator has released seats on your particular service, so check your operator before planning a journey around an upgrade.
The app is free, carries no membership fee, and Seatfrog says more than a million customers have saved £110 million through it. It is mobile only, on iOS and Android — there is no desktop route into the auctions.
Seatfrog’s terms are explicit that bids are irrevocable and cannot be modified once placed. You cannot lower your offer, and you cannot withdraw it if you change your mind. Decide the most the seat is worth to you before you enter the auction rather than during it, because that number is the only protection you have once the bid is in.
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